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Glossary of engineering and industry terms

Industry Glossary



The Industry Glossary covers the most common terms and abbreviations used in the primary industry, oil and gas, petrochemical and refinery industry, transport, aviation and maritime sectors, food and pharmaceutical sectors, energy and waste recycling, machine and equipment construction, and utility and HVAC industries.

These definitions are grouped based on the eight key product groups produced and commercialized by ERIKS. To make it easier to understand these terms, we've linked them with relevant products from our webshop or articles and guides from our Knowledge center. Therefore, if you click on the term, you will be taken either to a product page that is relevant for the defined term, or to a comprehensive article that explains that product or the main category it belongs to.



FLOW CONTROL GLOSSARY

Absolute pressure
The pressure measured above a perfect vacuum, expressed in bar, Pascal or PSI.
Actuator
Device used for opening, controling and closing a valve, which is used in general when a valve is positioned remotely, when it's located in hazardous areas or when the manual operation of the valve would take too much time. The main types of actuators are electrical, hydraulic and pneumatic actuators. These can be further classified in quarter-turn and multi-turn actuators, depending on the number of turns of the stem required for moving the valve from a fully open to a fully closed position.
Air valve
Valve used for air flow control. Given that air flows are usually small, solenoid valves are commonly used for this purpose.
Angle valve
Globe valve in which the inlet and outlet ports are at 90°.
Back pressure
Pressure exerted on the downstream side of the valve seat.
Definition of a Ball valve
Ball valve
Quarter-turn valve with a spherical closing element held between two seats, used mostly as on/off valves in the chemical industry. They can be made of one, two or three pieces, and ensure a quick opening and good shut-off.
Bidirectional
Device whose design allows for bi-directional flow.
Butterfly valve
Definition of a Butterfly valve
Quarter-turn valve with a circular disk as its closing element, in which the valve stem generally runs through the disk, giving the valve a symmetrical, butterfly-like appearance. More modern designs off-set the stem, which cams into the valve seat, this construction model being more advantageous as it causes less wear and tear on the disk and seats of the valve. High performance butterfly valves offer zero leakage, therefore can be safely used in industries like hydrocarbon processing or chemical.
Bypass valve
Small bore valve mounted in parallel to a larger, main valve, for reducing the differential pressure across the main valve before the latter is opened. Ball valves help prevent the damage of the internal components of the larger valve.
Definition of a Check valve
Check valve
Valve which allows the fluid to flow in a given direction, but prevents backflow thanks to its design. These valves, also called non-return valves, are generally self-acting, and can be further classified into swing check valves, wafer check and tilting disc check valves.
Conduit valves
Gate valve with a rectangular disk as closing element, in which one half of the disk is solid and closes the valve, and the other has a circular port that is used for opening the valve.
Cryogenic valve
Valves designed for use in temperatures under -40°C.
Diaphragm valve
Definition of a Diaphragm valve
Bi-directional valve operated by applying an external force to a flexible element or diaphragm, made of an elastomer. These valves can be used in environments where other valve designs might clog, such as in slurries or hygienic applications.
Diverter valve
Valve which can divert the flow direction of the medium to two or more different directions.
Emergency shut down valve (ESD)
Valve that uses energy stored in the actuator for closing rapidly in case of emergency.
Float valve
Valve which opens and closes automaticaly when the fluid level changes, and is operated mechanically by a float which rests on the top of the fluid.
Full bore
Valve for which the internal diameter of the opening is equal to the internal diameter of the piping to which the valve will be fitted.
Definition of a Gate valve
Gate valve
Multi-turn valve with a gate-like disc that moves linearly, perpendicular to the flow direction, and two seats that close the valve. Usually used in fully opened or fully closed position, this valve provides good sealing and is used in the petrochemical industry. Gate valves can be further classified into conduit gate valves, knife gate and wedge gate valves.
Definition of a Globe valve
Globe valve
Multi-turn valve used for general flow control and throttling, that features a closing element which moves perpendicularly to the valve body seat and usually seals in a plane parallel to the flow direction.
Jacketed valve
Valve whose body is covered in a jacket. Steam can be introduced into the jacket to keep the fluids at a specific temperature.
Knife gate valve
Gate valve with thinner gate and a knife-like edge, used with floating solids, for example in the pulp and paper industry.
Line blind
Pipeline shut-off device that can be used instead of a valve, and which consists of a flat disk forced between two flanges. This requires more time to operate than valves but has a lower price.
Linear valve
See Multi-turn valve.
Multi-ported
Valve with additional inlet and outlet ports that allow fluids to be directed. The ball and plug valves fit in this category.
Multi-turn valve
Valve which requires multiple turns of the stem to move the valve from a fully open position to a fully closed one. Globe valves, gate and needle valves are included in this category. Multi-turn valves are also called linear valves.
Needle valve
Multi-turn valve with a needle-shaped closing element, which looks similar to the globe valve. It is generally smaller and used on secondary systems for on/off applications.
Pilot valve
Small valve used for operating larger valves, which requires little power.
Definition of a Pinch valve
Pinch valve
Valve that consists of a flexible hose pinched between two moving external elements, whcih stop the flow. It is suitable for use in slurries and in the mining industry, as its operation is not affected by solid matter in the medium.
Plug valve
Multi-turn valve with a rotating plug as closing element. The plug may be cylindrical or truncated, and in the open position, the fluid flows through a hole in the plug.
Positioner
Device used for ensuring that the closing element of a valve moves to or remains in the correct position.
Pressure relief valve (PRV)
Valve which opens when the pressure in a vessel exceeds a specified value, and closes when the pressure returns to normal. Safety valves fit in this category.
Quarter-turn
Valve which requires a 90° turn of the stem to move from the fully open to the fully closed position. Ball, butterfly and plug valves fit in this category.
Reduced bore
Valve for which the internal diameter of the opening is lower than that of the piping to which the valve needs to be fitted.
Definition of a Safety valve
Safety valve
Pressure relief valve that opens rapidly and fully, in response to static upstream pressure.
Solenoid valve
Valve operated by an electrical solenoid, often deployed as pilot valves for controlling larger valves. An example is the needle globe valve.
Swing check
Non-return valve with a hinged disk as closing element.
Tank valve
Valve designed for fitting at the bottom of a tank or process vessel.
Throttling
Ability to control the amount of flow through a valve, as compared to a simple on/off function.
Valve body
The valve body is the main pressure boundary, which provides the ends for connecting the pipes, and the fluid flow passageway.
Valve closure member
Movable part of the valve positioned in the flow path, whose purpose is to modify the flow rate through the valve. Different types of closures include ball, disk, gate and plug.
Valve seat
Part of a valve against which the closure element effects a tight shut-off.
Valve stem
Rod extending through the bonnet assembly that permits the positioning of the closure member.
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SEALING AND POLYMERS TERMS

Back-up ring
Anti-extrusion ring or support ring.
Bi-directional seal
A seal that prevents leakage from both directions.
Break-out force
The amount of frictional force required to start a body in motion over a surface.
Cold flow
Continued deformation under stress. Also called Creep.
Composite material
A heterogeneous combination of two or more materials (reinforcing elements, fillers and binders). The combination results in a material that maximizes specific performance properties.
Compression set
The permanent deformation of a seal after release of a compressive load.
Copolymer
A polymer consisting of two of more different monomers chemically combined.
Creep
The progressive relaxation of a given polymer while under stress.
Deflection
The overlap in dimension between the seal free height and the gland into which it is installed. Synonymous: squeeze for elastomer or rubber.
Dynamic seal
A seal required to prevent leakage between opposing surfaces, which are in relative motion.
Elasticity
The tendency of a body to return to its original shape and dimensions after having been stretched, compressed or deformed.
Elastomer
Any synthetic or natural material which can return rapidly to its original shape after major or minor distortion. Elastic, rubber-like material.
Elongation
Generally referred to as ultimate elongation. Percent increase in original length of a specimen when it reaches its breaking point.
Extrusion
Distortion or flow of part of a seal into an extrusion gap under pressure.
Extrusion gap
The clearance on the low pressure side between two bodies, which confine the seal.
Face seal
A seal that is compressed in a direction parallel to the axis.
Flash
Thin imperfections on the elastomeric portion of a seal, formed by extrusion of the elastomer at the parting lines in the mold cavity.
Flex cracking
A surface cracking induced by repeated bending or flexing.
Free height
The measure of radial height for a radial seal or the axial width for a face seal when the seal is in free-state.
Fretting
A combination of corrosion and wear which occurs when a seal wipes the oxide coating from a shaft sleeve, exposing the base metal to the action of corrosion.
Friction
The force that resists the relative motion of two bodies in contact.
Gasket
A seal which is used between two relatively static surfaces to prevent leakage. It is made from any deformable material.
Gland
A cavity into which a seal (or O-ring) is installed. It includes the groove and mating surface which together confines the seal.
Gland cross section
The radial height of the gland for a radial seal. The axial width of the gland for a face seal.
Hardness
A material’s resistance to a distorting force. The hardness is measured by the relative resistance of the material to an indentor point. Higher numbers indicate harder material.
Housing
A rigid structure which supports and confines the seal assembly with respect to the shaft.
Hydraulic seal
A seal normally energized by a rubber or an elastomeric component and designed specifically for hydraulic and pneumatic applications.
Jacket
The plastic or elastomeric member surrounding the spring.
Leakage rate
The quantity of fluid passing through a seal in a given length of time. For compressible fluids, it is normally expressed in standard cubic feet per hour (SCFH), and for uncompressible fluids, in terms of cubic centimeter per unit of time.
Lip seal
An elastomeric or fluoroplastic seal that prevents leakage in rotary shaft seal applications by employing one or more contact lips to provide a scraping or wiping action on the shaft surface. These seals are commonly called shaft seals, oil seals or rotary lip seals.
Modulus
Indicative of the stiffness or rigidity of the materials. Modulus is measured in psi (pounds per square inch), and it can be measured in any mode of deformation, i.e. tension (stretching), compression (crushing), flexing (bending), or torsion (twisting).
OmniFlex
A proprietary perfluoroelastomer material. It has excellent thermal and chemical resistance properties.
O-ring
A toroidal shaped sealing device usually made from rubber or elastomeric material.
Perfluoroelastomer
A polymeric material which is fully fluorinated and exhibits high chemical resistance.
Permanent set
Permanent deformation of spring or elastomer upon release of load.
Permeation
The passage of a fluid under pressure through a solid material by diffusion.
Polymer
A material formed by the joining together of many (poly) units (mer) of one or more monomers.
Porosity
Quality or state of being porous.
PV factor
An arbitrary term which is the product of face pressure and relative sliding velocity. The term is normally considered to provide some measure of severity of service, and thus relates to a seal’s wear life. The units customarily used are “psi-fpm.”
Radial seal
Seals that are compressed in a radial direction. Radial seals are used as rod and piston seals and are usually dynamic, although they may occasionally be static.
Run-out
Twice the distance which the center of a shaft is displaced from the axis of rotation. It is expressed in “TIR” (total indicator runout/reading).
Scraper
A device employed to keep out dirt or other foreign matter.
Seal
A device designed to prevent the passage of a medium (fluid or solid).
Seal cavity
The annular area into which a seal is installed.
SES
Spring energized seal.
Spring
A machine element capable of restoring energy and releasing it.
Static seal
A seal between two surfaces which have no relative motion.
Tensile strength
Ratio of the maximum load a material can support without fracture when being stretched to the original area of a cross section of the material.
Thermal expansion
Expansion caused by increase in temperature.
Torque
The tendency of a force to produce rotation about an axis. Frictional torque equals frictional force times the radius of rotation.
Uni-directional seal
A seal that prevents leakage from only one direction.
Vacuum
An enclosed space that is occupied by a gas at less than atmospheric pressure.
Vulcanization
A thermo-setting reaction involving the use of heat and pressure, resulting in greatly increased strength and elasticity of rubber-like materials.
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ENGINEERED PLASTICS

Aging
The change of a material with time, under defined environmental conditions, leading to deterioration or improvement of the material properties.
Antistatic agent
Agent which is added to a molding material or is applied on a product's surface to make it less conducting.
Back taper
Reverse draft used in a mold to prevent the molded items from drawing freely.
Bloom
Exudation or efflorescence on the surface of a plastic, usually caused by lubricants or plasticizers.
Boss
Projection of a plastic part designed to add strength and to facilitaet the alignment of the parts during assembly.
Breathing
The opening and closing of a mold through which gases escape earely in the molding cycle.
Casting
Formation of a plastic object by pouring a fluid monomer-polymer solution into a mold.
Chalking
Occurrence of a dry chalk-like deposit on the surface of a plastic.
Clamping plate
Plate fitted to a mold, used for fastening the mold to a molding machine.
Cold flow
See Creep.
Cold slug
The first material added in an injection mold.
Composite material
A heterogeneous combination of two or more materials (reinforcing elements, fillers and binders). The combination results in a material that maximizes specific performance properties.
Copolymer
A polymer consisting of two of more different monomers chemically combined.
Coring
Removal of excess material from the cross section of a molded part, to attain an even wall thickness.
Creep
Change of a material's dimensions with time, caused by load. When this happens at room temperature, it's called Cold flow.
Curing
Change of the physical properties of a material through a chemical reaction, such as condensation, vulcanization or polymerization. The temperature at which this change happens is called Curing temperature.
Delamination
Splitting of a plastic material along the plane of its layers.
Dielectric
Insulating material.
Dwell
A pause in the application of pressure to a mold, made just before the mold is completely closed, with the purpose of allowing gas to escape from the material.
Elasticity
The tendency of a body to return to its original shape and dimensions after having been stretched, compressed or deformed.
Elastomer
Material which stretches at room temperature, under low stress, doubling its length, and snaps back to its initial length once the stress factor is released.
Elongation
Percent increase in original length of a specimen when it reaches its breaking point.
Extrusion
Compacting of a plastic material which is then forced through an orifice in a continuous fashion.
Family mold
Multi-cavity mold in which each of the cavities forms a different part of the assembled object.
Filler
Additive added to a resin with the purpose of improving its physical properties and reducing its price.
Flash
Extra plastic attached to a molding along the parting line.
Friction
The force that resists the relative motion of two bodies in contact.
Hardness
A material’s resistance to a distorting force. The hardness is measured by the relative resistance of the material to an indentor point. Higher numbers indicate harder material.
Haze
The degree of cloudiness of a plastic material.
Injection molding
Molding procedure in which a soft plastic material is forced through a cylinder into a cavity, where it will harden in the desired shape.
Mold release
Lubricant used for coating a mold cavity, which prevents the molded item from sticking to the mold. The mold release facilitates the removal of the finished product, and is also called Release agent.
Permanent set
Increase in length of an elastic material caused by stress applied for a standard period of time and expressed as a percentage of the initial elngth, after which the material fails to return to its original length.
Plasticizer
Material added to a plastic for increasing its workability and flexibility.
Platens
The mounting plates of a press on which the mold halves are attached.
Polymer
A material formed by the joining together of many (poly) units (mer) of one or more monomers.
PV factor
A term which is the product of pressure and relative sliding velocity. The term is normally considered to provide some measure of severity of service, and thus relates to wear life.
Reinforcement
Strong inert material bound into a plastic for improving its strength and impact resistance.
Sintering
Process of holding a pressed-powder article at a temperature just below its melting point for a precise interval of time, in order for particles to fuse together, but without the mass melting.
Sprue
Feed opening of an injection or transfer mold.
Tensile strength
Ratio of the maximum load a material can support without fracture when being stretched.
Thermal expansion
Expansion caused by increase in temperature.
Torque
The tendency of a force to produce rotation about an axis. Frictional torque equals frictional force times the radius of rotation.
Vulcanization
A thermo-setting reaction involving the use of heat and pressure, resulting in greatly increased strength and elasticity of rubber-like materials.
Warpage
Dimensional distortion in a plastic object after molding.
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INDUSTRIAL AND HYDRAULIC HOSES

Abrasion
External damage to a hose or hose assembly caused by rubbing against a coarse, rugged or sharp surface.
Abrasion resistance
The ability of the hose to withstand abrasion.
Tube (internal layer of the hose): The ability of the hose or hose assembly to withstand failure caused by an abrasive medium passing through the hose, such as sand, cement or glass.
Cover (external layer of the hose): The ability of the hose assembly to withstand abrasion caused by coarse, rugged or sharp surfaces or objects rubbing against the cover.
Adapter, adaptor
1) Threaded fittings of various sizes and materials used to change an end fitting from one type to another type or one size to another. For example, a male BSP to male NPT is often attached to a swiveling female BSP to create a male end union NPT fitting.
2) The male part of a quick coupling, for example a cam & groove coupling or cardan coupling.
Actual burst pressure
Value of the pressure at which the hose assembly is expected to rupture, or the braid is expected to fail. This pressure is determined in a laboratory setting at 21°C, with the hose installed in a straight line.
Ambient temperature
The temperature of the atmosphere or medium surrounding a hose in service.
Angular movement
The bending of the hose that causes the ends to no longer be parallel. The amount of movement is measured in degrees from the centerline of the hose. Angular movement of a hose
Annular
Refers to the convolutions on a metallic hose that are a series of complete circles or rings located at right angles to the longitudinal axis of the hose.
Annular corrugated hoses
Hoses obtained by expanding the tube or inner layer of the hose from the inside to the outside. The corrugations that result are equally spaced, parallel and perpendicular to the hose axis. These hoses are superior to helical ones, from a technical point of view, as they don’t produce torsion loads with increased pressure or pressure surges, and they can be easily connected to fittings.
ANSI
American National Standards Institute.
API
American Petroleum Institute
ASTM
American Society for Testing and Materials
Axial movement
Compression or elongation along the longitudinal axis.
Barb
The portion of a fitting or coupling that is inserted into the hose, designed to seal the hose and fitting.
Bend radius
The minimum radius one can bend a hose without kinking it, damaging it, or shortening its life. The radius of a bent section of a hose is measured to the centerline (R) of the curved portion. Bend radius of a hose
Bend radius, dynamic
The smallest radius at which a hose can be used without kinking while constant or continuous flexing occurs.
Bend radius, static
The smallest radius at which a hose can be used without kinking while bent or flexed into a fixed position.
Bending force
The amount of force required to induce bending around a specified radius and hence, a measure of stiffness.
Blister
A raised area on the surface of a rubber hose. Can be caused by a separation between the rubber layers creating a medium filled space.
Blow out force
The force generated from the internal pressure attempting to push the fitting from the hose.
Braid
1) Braided reinforcement in a rubber hose to increase pressure rating and add hoop strength. A lot of different materials such as polyester, cotton or metal wire are used. A hose may have one or more braids between layers of hose material.
2) Braided reinforcement of a metal or PTFE hose a the outside of the hose to assure an increased pressure rating.
Brass
A family of copper/zinc alloys.
Bronze
An alloy of copper, tin and zinc.
BSPP
British Standard Pipe Parallel thread per ISO 228-1:2000
BSPT
British Standard Pipe Taper thread per ISO 7-1:1994
Burst pressure
The pressure at which a rupture caused by internal pressure occurs.
Butt weld
Process in which the edges or ends of the metal sections are butted together and joined by welding.
Cam & groove
A type of fitting that allows connection and disconnection by means of arm(s) or cam(s) on the female fitting. The seal is accomplished by means of a gasket, available in various materials. These fittings are frequently used on product transfer hose assemblies.
CGA
Canadian Gas Association
Cloth impression
Impression formed on the rubber surface during vulcanization by contact with nylon curing tape.
Composite hose
Non-vulcanized hose that consists of the following construction:
An internal wire helix;
A multi-ply wall of thermoplastic layers, films and reinforcing fabrics in proportions that give the required physical properties and provide a complete seal.
A cover consisting of fabric with an abrasion resistant polymeric coating;
An external helix wire.
Conductive hose
Conductivity refers to the electrical properties of the materials making up the hose, usually the tube, layers and/or cover material. Conductivity is measured in M-Ohms. Conductive hoses are used in applications where the conveyed material can generate static electricity build-up. Such hoses will dissipate static electricity through the rubber material to the hose ends, provided the correct coupling material is used.
Corrugated hoses
Hoses made of a seamless or longitudinally-welded, thin-walled tube, into which corrugations are introduced by mechanical or hydraulic means. Each of these methods creates different corrugations: the hydraulic method leads to annular corrugated hoses, while the mechanical technique can lead to both annular or helical corrugated hoses. We see therefore that there are two main types of corrugated hoses: annular and helical.
Coupler
The female part of a quick coupling. For example, a cam & groove coupling, cardan coupling. Quick release coupling.
CPE
A rubber elastomer, ASTM designation for chlorinated polyethylene.
CR
A rubber elastomer, ASTM designation for Chloroprene Rubber
Crimping
A fitting attachment method utilizing a number of dies mounted in a press. The dies close perpendicular to the hose and fitting axis, compressing the ferrule around the hose.
CSM
A rubber elastomer, ASTM designation for chlorosulfonated polyethylene.
Cuff
Soft wall, wireless, built-in ends of a hose.
Deformation pressure
Pressure at which the hose corrugations will be permanently deformed.
Design pressure
The maximum pressure to which a hose will be subjected, including the momentary surges in pressure, which can occur during service.
DIN
Deutsches Institut für Normung, the German Institute for Standardization.
Dog-leg
Two hose assemblies joined by a common elbow.
Dye penetrant test
Also called liquid penetrate inspection or penetrant testing, is a low-cost inspection method used to locate surface-breaking defects in all non-porous materials (metals, plastics or ceramics).
EN
A document that has been adopted by one of the three recognized European Standardization Organizations: CEN, CENELEC or ETSI.
EPDM
An rubber elastomer, ASTM designation for Ethylene Propylene Diene Monomer.
Erosion
The wearing away of the inner corrugation of a hose caused by the conveyed media.
EVA
A co-polymer, ASTM designation for Ethylene Vinyl Acetate.
Extruded/Extrusion
Extrusion is a process used to create objects of a fixed cross-sectional profile. A material is pushed through a die of the desired cross-section. The two main advantages of this process over other manufacturing processes are:
1. An excellent surface finish in the inside of the hose, extremely important for food, pharmaceutical, cosmetical and chemical applications
2. One "endless" tube with no possible leak-paths in comparison with hose that are produced by wrapping technology.
Fabric impression
Impression formed on the rubber surface during vulcanization by contact with nylon curing tape.
Fatigue
Failure of a hose caused by flexing, which results in the break down of the metal structure.
FDA
United States Food and Drug Administration.
FEP
A co-polymer, ASTM designation for Fluorinated Ethylene Propylene.
Ferrule
A metal cylinder placed over a hose end to affix the fitting to the hose.
Helical corrugated hoses
Helical corrugated hoses consist of a right-handed helix with constant pitch that runs along the whole length of the hose. These hoses are obtained through mechanical corrugation, during which pressure rollers are placed around the tubes and create the desired profile from the outside to the inside.
Helix
A metal wire helix embedded in the hose wall; typically used in suction hoses.
Hose braiding
Wire netting braided from bobbins that move in opposite directions. These braidings are laid directly on a metal corrugated or smooth hose or on a core, their role being to limit the expansion of the hose under internal pressure, and to maintain the structure of the tube under external pressure. Depending on the application of the hose, one or more braided layers can be used over the tube. If more layers are braided together, the resulting layer is called braided braid. This type of protective layer is used in general for hoses with a larger diameter.
Hose inlay
A hose with inlay can be made of two layers of plastic – one internal and one external, which are separated through a reinforcement or inlay made of wire. On the other hand, a hose without inlay is made of two plastic layers that have no additional material between them.
Hydrostatic testing
The use of a pressurized liquid, usually water, to test a hose assembly for leakage and hose change-in-length.
ISO
International Organization for Standardization.
JIC
Joint Industrial Council (no longer in existence). An engineering group that established an industry standard fitting design incorporating a 37° mating surface, male and female styles. Now governed by SAE.
Lateral movement
This movement occurs when the hose centerline is moved in a plane perpendicular to the longitudinal axis with the end remaining parallel. Lateral movement of a hose
Layflat hoses
Flexible hoses made of two layers of PVC that are inseparably fused, with a woven yarn reinforcement. Unlike rubber or metal hoses, these ones are collapsible, and are very flexible, lightweight, strong and weather resistant.
Mandrel
A round section used for size and to support hose during fabrication and vulcanization. It may be rigid (carbon steel or stainless steel) or flexible (rubber or plastic).
Mandrel built
A hose fabricated on a mandrel.
Media, medium
The substance being conveyed through a hose.
Maximum working pressure
Maximum operating pressure at which the hose assembly should be subjected. This value should take into consideration the surges in pressure that may occur during service.
NBR
A rubber elastomer, ASTM designation for Nitrile Butadiene Rubber.
NPT
National Pipe Taper. Pipe thread per ANSI B1.20.1.
NPTF
National Pipe Tapered for Fuels. Identical as NPT except dry-seal per ANSI B1.20.3.
Ozone cracking
Surface cracks caused by exposure to an atmosphere containing ozone.
Ozone resistance
The ability to withstand the deteriorating effects of ozone.
Offset motion
Motion that occurs when the ends of a hose assembly are displaced laterally to each other, in a place perpendicular to the longitudinal axis of the hose.
Pig
A mechanical projectile used for cleaning hose.
Pin pricked
Perforations through the cover of a hose to vent permeating gases.
Plating
A material applied to metal by electroplating, for the purpose of reducing corrosion; typically a more noble metal such a zinc is applied to steel.
Ply
An individual layer in hose construction.
Polyurethane (PUR or PU)
Is a polymer composed of organic units joined by carbamate (urethane) links. Polyurethane hoses have a very good abrasion resistance.
Pressure drop
The amount of pressure lost by a medium as it is conveyed through a hose assembly.
Proof pressure
See Test pressure
PSI
Pounds per square inch.
PTFE
Synthetic fluoropolymer of tetrafluoroethylene that has numerous applications. PTFE is renowned as the most chemically resistant material known. PTFE lined hoses can be used for a wider variety of chemicals than any other hose type, making it the ideal choice for very corrosive chemical applications and multiproduct applications.
PVC
ASTM designation for polyvinyl chloride.
Radial motion
Motion that occurs when the centerline of a hose assembly is bent in a circular arc.
Rated burst pressure
Value of the burst pressure which may be a percentage of the actual burst pressure measured in a laboratory setting.
SAE
Society of Automotive Engineers.
SBR
An rubber elastomer, ASTM designation for Styrene-Butadiene.
Shank
That portion of a fitting, which is inserted into the bore of a hose.
Shock pressure
Pressure spike; sudden increase in pressure which creates a shock wave through the hose assembly. Also called Surge pressure.
Skive
The removal of a short length of cover and/or tube to permit the attachment of a fitting directly over the hose reinforcement.
Spring guard
A helically wound component applied internally or externally to a hose assembly, used for strain relief and collapse resistance.
Static electricity
Static electricity is the electric charge generated when there is a friction between two things made of different materials or substances.
Static wire
A copper wire incorporated in a hose to conduct static electricity.
Squirm
Failure of a hose caused by excessive internal pressure, which causes the internal corrugations to warp into an S or U shape.
Test pressure
Maximum pressure at which a hose can be subjected to without deforming its corrugations and without exceeding 50% of the burst pressure. Also called Proof pressure.
Tig weld
The gas tungsten arc welding process sometimes referred to a shielded arc.
TPE
Thermoplastic elastomer, also commonly referred to a thermoplastic rubber (TPR). A class of materials that demonstrate both plastic and elastomeric properties than can be extruded and injection molded.
TPR
Thermoplastic rubber.
Traveling loops
Installation configuration designed for axial motion or excessive offset motion.
USP
United States Pharmacopia.
USDA
United States Department of Agriculture.
Working pressure
The maximum pressure to which a hose will be subjected, including the momentary surges in pressure, which can occur during service.
Working temperature
The temperature range of the application, may include the temperature of the fluid conveyed or the environmental conditions the assembly is exposed to in use.
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GASKETS

Anti-extrusion ring
Ring used to fit behind rubber o-ring seals, to prevent extrusion into the gap between the metal pieces. Also called Back-up ring.
Automatic U-joint
An U-shaped sealing ring made of a strong pliable plastic or rubber material.
Baffle ring
Ring used for slowing down the flow of fluids along a shaft
Bellow
Corrugated rubber or plastic piece which can stretch with a shaft, to keep the shaft clean.
Bore
Inner dimension (I.D.) of a gasket.
Bumper
Rubber or plastic part used for preventing metal-to-metal contact.
Crazing
Surface effect in rubber materials characterized by many minute cracks.
Creep relaxation
Loss of stress accompanied by the decreasing of the compressed thickness.
Double acting seal
A seal ring used for sealing in two directions, on the push and the pull stroke of a cylinder.
Dust seal
A seal used for excluding dust from a machine or device.
Face seal
Rubber ring used like a gasket between two flat piece of metal.
Full faced gasket
Gasket that covers the full face of a flange and features bolt holes.
Gasket
Rubber-like part made of a flexible material that fits between two metal parts, for sealing purposes. It is usually a flat, non-moving part made from a homogeneous rubber, a fabric-reinforced rubber or other materials.
O-ring
Loop of elastomer with an o-shaped cross-section.
Ozone cracking
Cracking of the surface caused by exposure to ozone.
Pressure rating
The pressure the material can seal against.
Scorch
Premature vulcanization of a rubber compound due to excessive exposure to heat.
Spiral wound gasket (S.W.G.)
Gaskets made of metal coil or winding, with a material filler. Spiral wounds can withstand very high perssures.
Vulcanization
Irreversible change in the chemical structure of a rubber compound, which becomes less plastic and more resistant to swelling by organic liquids. The elastic properties are improved or extended over a greater range of temperature.
X ring
Rubber ring with a special shape used for replacing O-rings, and for eliminating the potential rolling of the ring.
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POWER TRANSMISSION

Anti-friction bearing
Bearing that uses rolling contact to cut power loss resulting from friction.
Ball bearing
Definition of a Ball bearing
A ball bearing is a rolling bearing and usually consists of an inner and outer ring. One or two rows of balls sit in between these rings. A ball bearing ensures that the friction of a rotational movement is reduced due to the rotation of the balls. Ball bearings have a simple design, they are suitable for high and even very high speeds, they are robust and require little maintenance.
Bearing
Designed to enable rotational or linear movement in a device, bearings are machine elements that are used to reduce friction between moving parts and to enhance the speed and efficiency of a system. At the same time, bearings are used to support other parts of a machine by handling various amounts of stress. Depending on the design of the bearing, these surfaces may vary, but in general bearings are made of two rings or discs with raceways, rolling elements like rollers or balls that roll against the inner and outer metal surfaces, and a cage which keeps the rollers apart and guides them.
Definition of a Bearing
Cage
Separator that holds the rolling elements in their position along the races.
Definition of a Roller bearing
Roller bearing
Roller bearings generally consist of two bearing rings with integrated races. Between the bearing rings there are rolling elements. These elements are also referred to as anti-friction bodies and move freely over the races.
Slide bearing
In slide bearings, the part moves along the sliding surface of a fixed bearing bush, bearing block or sliding strip. As a result, there is a sliding movement directly between the sliding layer of the bearing element and the part mounted on the bearing.
Definition of a Spherical bearing
Spherical bearing
Spherical bearings are self-aligning bearings. This prevents misalignment of the shaft and ensures that the shaft does not need to be adjusted. Spherical bearings are also less sensitive to deflection or bending of the shaft.
Tapered bearing
Definition of a Tapered bearing
Tapered bearings have inner and outer ring races between the rollers. The projection lines of the surfaces hit each other at the same point on the shaft. This design makes it possible to absorb radial and axial loads simultaneously.
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TOOLS, MAINTENANCE AND SAFETY

Finger guard
Item used for protecting the fingers. Finger guards are generally available in three different styles: as a flat guard with elastic back and open end, as guard with closed end, and as a wrap with elastic back and open end which provides protection around the entire circumference of the finger.
Gauntlet
Protective glove used in certain industries like constructions, plumbing, cutting, working with metals, auto repair and equipment repair, stamping. They are usually made of metal, rubber, leather or a combination of these materials, and provide protection against cuts, hits, punches, abrasion and temperature.
Mitten
Glove without individual finger openings, that has a high thermal efficiency. Some mittens have a flap that allows one to uncover their fingers during tasks that require a better grip or higher precision.
Protective glove
Garment used for protecting the hands and wrists from hazards in the workplace. They are suitable for virtually all industries and applications, but their functionality is influenced by the design, construction and materials they are made of. Gloves offer protection against punctures and cuts, chemicals, heat and cold, electricity, contaminants.
Safety cuff
Personal protection item that can be attached by a seam at the wrist for extending the hand and arm protection. Generally made of more rigid materials that remain firm even when exposed to perspiration, and slide on and off easily.
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CONVEYING SYSTEMS

Apron feeder
A series of overlapping metal plates mounted on a rotating chain, used for transporting heavy or abrasive materials.
Backstop
Braking device used for preventing a loaded, inclined conveyor belt from rolling backwards in case the motor stops.
Bed
A flat surface such as a formed steel sheet on which the conveyor belt returns. Also called Slider.
Bed length and width
The length and width of the steel profiles that are joined together to form the conveyor belt.
Chute
Enclosure used for containing material as it is transferred from one piece of equipment to another.
Cleat
Attachment fitted to a conveyor belt for forming a raised section that supports and stabilizes the products carried up an incline belt.
Conveyor belt
Belt used in the internal transport of goods, for example to move a semi-finished product or a finished product to a different location within the production process.
Feeder
Device on the infeed of the conveyor that regulates the flow of products from a storage hopper onto the belt.
Idler
Non-powered rolling component used for supporting a conveyor belt on the carrying or return run.
Infeed end
The end of a conveyor belt where parts are fed on.
Nip guard
Plate placed in various points of the conveyor belt to eliminate danger.
Noseover
Section of a conveyor belt going from incline to horizontal.
Powered feeder
The low end of an inclined conveyor belt.
Scraper
Rigid plastic or brush used for cleaning the belt.
Under guard
Metal sheet used to protect the underneath side of a conveyor belt.
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