Pressure Relief Valves Specifications

Actuation



	Your choices are...
	Mechanical Device		A mechanical device such as a float or cam activates the valve. This does not include powered actuators.
	Electric		An electric actuator activates the valve.
	Electro-hydraulic		A servo valve that produces hydraulic control in response to an electrical signal input.
	Electro-pneumatic		A servo valve that produces pneumatic control in response to an electrical signal input.
	Pilot Operated		A pilot valve activates the valve.
	Pneumatic		The valve is activated by a pneumatic actuator or cylinder to open and close valve.
	Thermally Actuated		The valve is activated by a change in temperature in the handled media. Typically, temperature and pressure relief occurs once a preset temperature is reached.
	Other		Other unlisted, specialized, or proprietary actuation method.
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Media Description



	Your choices are...
	General Purpose		Valves that cover a variety of general industrial medias.
	Air		The valve can handle all types of non-pressurized air.
	Breathable Air		Air that is free of contamination and is suitable for inhalation.
	Compressed Air		Air that is under a pressure greater than atmosphere.
	Water		Any type of water.
	Hot Water		Water that has been heated.
	Cold Water		Unheated water to cool.
	Ground Water		Untreated water that is found on or collects freely on the ground.
	Potable Water		Water that is considered safe and fit for human consumption, culinary and domestic purposes and meets the requirements of the health authority having jurisdiction.
	Salt Water		Water that has a high concentration of salt, often from the ocean or sea.
	Wastewater		The spent or used water of a community or industry that contains dissolved and suspended matter.
	Gas		Any type of gas, although generally excluding air.
	Gasoline / Diesel Fuel		A mixture of flammable liquid hydrocarbons derived chiefly from crude petroleum and used as a fuel for internal-combustion engines.
	High Purity Gas		Designated by manufacturer as being applicable and built for high purity applications - includes nitrogen, argon, oxygen, hydrogen, and H.P. mixtures.
	LP - Gas		Liquefied petroleum is a gas containing specific hydrocarbons that are gaseous under normal atmospheric conditions, but can be liquefied under moderate pressure and temperatures. Propane and butane are examples.
	Natural Gas		Liquid hydrocarbon mixtures that are gaseous at reservoir temperatures and pressures but are recoverable by condensation or absorption. Natural gasoline and liquefied petroleum gases fall in this category.
	Sour Gas		Hydrogen sulfide (H₂S) laden gas.
	Specialty / Corrosive Gases		Specialty corrosive gases.
	Abrasive Material		Substances that abrade or wear down.
	Acids / Corrosive Chemicals		Substances with distinct molecular compositions that are produced by, or used in, a chemical process, or have a high concentration of acid.
	Adhesives		Substances capable of holding materials together by surface attachment.
	Concrete / Grout		Concrete is a building material created by combining a mineral (which is usually sand, gravel, or crushed stone) a binding agent (natural or synthetic cement), chemical additives, and water.
	Coolants		Media that produces cooling, especially a fluid that draws heat away by circulating through an engine or by bathing a mechanical part.
	Hazardous Materials		Substances capable of posing a risk to health, safety, or to property.
	High Viscosity Fluids		Typical results from this selection will yield products that have been designated by the manufacturer to handle thick liquid materials. Typically over 100,000 cps.
	Hydraulic Fluid		Fluid serving as the power transmission medium in a hydraulic system. The most commonly used fluids are petroleum oils, synthetic lubricants, oil-water emulsions, and water-glycol mixtures.
	Liquid Metal		Metal heated so that is in a liquid state.
	Lubricants		A substance, such as grease or oil, which reduces friction when applied as a surface coating to moving parts.
	Oil		Any of many mineral, vegetable, and synthetic substances and animal and vegetable fats that are generally slippery, combustible, viscous, liquid or liquefiable at room temperatures, soluble in various organic solvents such as ether but not in water, and used in a great variety of products, especially lubricants and fuels.
	Powder / Solids		Media in solid or powder state.
	Rendering Wastes		Wastes from food processing.
	Sludge		Solid matter produced by water and sewage treatment processes.
	Slurry / Ash Slurry		A watery mixture of insoluble matter.
	Steam		Water in a gaseous state at a temperature above its boiling point.
	Other		Other unlisted, specialized, or proprietary media.
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Primary Material of Construction


	Metals
	Your choices are...
	Aluminum		Aluminum is a bluish silver-white malleable ductile light trivalent metallic element that has good electrical and thermal conductivity, high reflectivity, and resistance to oxidation.
	Brass / Bronze		Brass comes with good strength, excellent high temperature ductility and reasonable cold ductility, good conductivity, excellent corrosion resistance, good bearing properties and low magnetic permeability. Sintered bronze is a porous material, which can be impregnated with oil, graphite or PTFE. Not suitable for heavily loaded applications but useful where lubrication is inconvenient.
	Cast Iron		The term "cast iron" refers not to a single material, but to a family of materials whose major constituent is iron, with important trace amounts of carbon and silicon. Cast irons are natural composite materials whose properties are determined by their microstructures - the stable and metastable phases formed during solidification or subsequent heat treatment. The major microstructural constituents of cast irons are: the chemical and morphological forms taken by carbon, and the continuous metal matrix in which the carbon and/or carbide are dispersed.
	Ductile Iron		Ductile iron retains cast iron's machinability and corrosion-resistance, and provides additional strength, toughness, and ductility. Although it’s chemical properties are similar to those of cast iron, ductile iron incorporates significant casting refinements, additional metallurgical processes, and superior quality control.
	Copper		A common reddish metallic element that is ductile and malleable and is one of the best conductors of heat and electricity.
	Stainless Steel		Stainless steel is chemical and corrosion resistant and can have relatively high-pressure ratings.
	Steel		Steel is a commercial iron that contains carbon in any amount up to about 1.7 percent as an essential alloying constituent. It is malleable when under suitable conditions, and is distinguished from cast iron by its malleability and lower carbon content.
	Other Metal		Other unlisted, specialized, or proprietary metal material.
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	Plastics:		Please consult the manufacturer of the valve for specific properties of the materials used in the valve.
	Your choices are...
	Acetal		Acetal polymers are semi-crystalline. They offer excellent inherent lubricity, fatigue resistance, and chemical resistance. Acetals suffer from outgassing problems at elevated temperatures, and are brittle at low temperatures. Glass filled, and added lubrication grades are available, flame-retardant grades are not. Brand names include Celcon® (Hoechst Celanese), Delrin® (Dupont), Thermocomp® (LNP), Ultraform® (BASF), and Acetron® (DSM).
	PVC		Polyvinyl Chloride (PVC) is a widely used material that has good flexibility, smooth surface, and nontoxic qualities. Some grades are used in food and chemical processes due to the inert nature of PVC. Brand names include: ACP® and Dural® (Alpha Gary), Geon® (Geon), Benvic® (Solvay), Flexalloy® (Teknor Apex).
	CPVC		Chlorinated polyvinyl chloride (CPC) a higher type grade of plastic commonly used for hot / cold water distribution, sprinkler piping, and some chemicals. Suitable for high temperatures.
	PTFE - Teflon®		Polytetrafluoroethylene (PTFE) is an insoluble compound that exhibits a high degree of chemical resistance and a low coefficient of friction. It is sometimes marketed in proprietary classes of materials such as Teflon®, a registered trademark of DuPont Dow Elastomers.
	Polyethylene (PE)		Commodity thermoplastic that is soft, flexible and tough - even at low temperatures - with outstanding electrical properties but poor temperature resistance. It also has very good chemical resistance but is prone to environmental stress cracking; it has poor UV resistance (unless modified) and poor barrier properties, except to water.
	Polypropylene (PP)		Polypropylene is a thermoplastic material exhibiting excellent cold flow, bi-axial strength, and yield elongation properties. It is similar to PVC but can be used in exposed applications because of its resistance to UV, weathering, and ozone.
	PVDF		Polyvinylidene fluoride (PVDF) is a melt processable fluoropolymer. It is similar in properties to other fluoropolymer, but has better strength and lower creep than the other members of this family. PVDF has good wear resistance, and excellent chemical resistance. But does not perform well at elevated temperatures. Brand names include: Kynar® (Elf AtoChem).
	Other Plastic		Other unlisted, specialized, or proprietary plastic material.
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Market Segment



	Your choices are...
	General Industrial		Valves for general use and not designed around a specific application or industry.
	Aerospace / Defense		Designated by manufacturer as being applicable and built to military specifications (MIL-SPEC). Covers aircraft, the military, equipment and supplies, as well as space, aerospace, medical and more.
	Agriculture / Horticulture		Designated by manufacturer as being applicable to the agricultural or horticultural industry. Establishments primarily engaged in the cultivation of soil and crops and the raising of livestock.
	Refrigeration		Designated by manufacturer as being suitable for use in refrigeration applications.
	Automotive		Designated by manufacturer as being applicable to the automotive industry. Includes vehicle and parts manufacturers, dealers and aftermarket services in the automotive sector.
	Commercial		Valves constructed for basic commercial uses.
	Construction		Designated by manufacturer as being applicable to needs within the construction industry.
	Cryogenic		Designated by manufacturer as being applicable to extreme cold applications such as for liquid gas and refrigerants.
	Fire Service		Designated by manufacturer as being applicable for use in fire service or fire fighting applications.
	Flood Control		Designated by manufacturer as being applicable for flood control applications.
	Food Service		Designated by manufacturer as being applicable and built for food service applications.
	Food Processing		Designated by manufacturer as being applicable and built for food processing applications.
	HVAC		Designated by manufacturer as being applicable to the heating, air conditioning, and ventilation industry.
	Irrigation		Designated by manufacturer as being applicable for use in irrigation applications.
	Machine Tool		Designated by manufacturer as being applicable for use within or around machine tools.
	Maritime		Designated by manufacturer as being applicable to the maritime or marine industry.
	Medical / Laboratory		Designated by manufacturer as being applicable to the medical industry.
	Mining		Designated by manufacturer as being applicable to the mining industry.
	Municipal		Designated by manufacturer as being applicable to use by municipal agencies.
	OEM Supply		Designated by manufacturer as being applicable to supplying components as an OEM supplier.
	Oil and Gas Production		Designated by manufacturer as being applicable for oil and gas production.
	Pharmaceutical / Biotechnology		Designated by manufacturer as being applicable to the pharmaceutical and biotechnology industries. Producers of organic and inorganic medicinal substances for human or veterinary use.
	Plumbing / Waterway		Designated by manufacturer as being suitable for plumbing and other water supply applications.
	Power Gen / Nuclear		Designated by manufacturer as being applicable to the power generation industry.
	Pulp and Paper		Designated by manufacturer as being applicable to the pulp and paper industry.
	Recreational		Designated by manufacturer as being applicable for use within the recreational products industry.
	Semiconductor		Designated by manufacturer as being applicable to the semiconductor industry.
	Other		Other unlisted or specialized industry or market segment.
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Features



	Your choices are...
	Poppet Valves		Poppet valves open and close ports with a sealing device composed of a disk, cone or sphere that is pressed against the seating surface using a spring.
	Servo Valves		Servo valves provide closed loop flow or pressure response to an electrical or electronic control signal. They are used in air, gas, and liquid applications.
	Solenoid Valves		Solenoid valves are electro-mechanical devices that utilize a solenoid to control valve activation.
	Cartridge / Manifold Valves		Cartridge valves are directional control valves that are inserted into manifolds to provide a cost effective compact system design.
	Diaphragm Valves		Diaphragm valves are related to pinch valves, but use an elastomeric diaphragm instead of an elastomeric liner to separate the flow stream from the closure element. Instead of pinching the liner closed to provide shut-off, the diaphragm is pushed into contact with the bottom of the valve body. Diaphragm valves are excellent for controlling the flow of fluids which contain suspended solids. They also offer the flexibility of installation in any position. Diaphragm valves are used widely in the pharmaceutical, food processing, and water treatment industries. Advantages include cleanliness and tight shut-off. Disadvantages include low pressure and temperature limits, and multi-turn operation.
	Stack Mounted		The valve is constructed in a modular format, so that it can be assembled to create a valve block. This type of valve is also referred to as a sandwich or modular valve.
	Severe Service Rated		The valve is designated by manufacturer as being suitable for severe service applications where there are continuing operational, maintenance or reliability issues with a given application.
	Precision Control		The valve has the ability to accurately control the flow or pressure.
	Blow Off Valves		Blow off valves (BOV) are used to blow pressure off the pipeline and in purging operations. Blow off valves are also used in the automotive industry to relieve pressure in the piping from the turbo to the inlet manifold when the throttle is backed off. When used in this way, they are referred to as compressor bypass valves.
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