Air Valves Specifications

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Valve Type



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	Angle Valves		Angle valves have an inlet and outlet at 90 degrees, or a control mechanism that enters the valve body at an angle to conserve room and allow maximum flow.
	Ball Valves		Ball valves provide tight shut-off and characterizable control. They have high rangeability due to the design of the regulating element, without the complications of side loads typical of butterfly or globe valves. Advantages include ease of operation and high flow, high pressure, and high temperature capabilities. Disadvantages include low cleanliness and an inability to handle slurries.
	Block and Bleed Valves		Block and bleed valves are configured so that flow through the valve is blocked at both the inlet and outlet, and a small port is provided to drain or depressurize the space between. This configuration is often required to isolate high-pressure sections of a system to facilitate safe maintenance or rapid depressurization. These valves are also referred to as double block and bleed valves.
	Butterfly Valves		Butterfly valves control the flow of gas or liquid with a disk which turns on a diametrical axis inside a pipe, or by two semicircular plates hinged on a common spindle, permitting flow in only one direction. They are used as throttling valves to control flow. Butterfly valves offer a rotary stem movement of 90 degrees or less in a compact design. Unlike ball valves, butterfly valves do not have pockets in which fluids may become trapped when the valve is closed. Advantages include suitability for chemical services, small dimensions, and high coefficient of flow. Disadvantages include low cleanliness and the inability to handle slurries.
	Cartridge / Manifold		Cartridge valves are directional control valves that are inserted into manifolds to provide a cost-effective, compact system design.
	Check Valves		Check valves are self-activating safety valves that prevent process flow from reversing.
	Compressor Valves		Compressor valves are used in reciprocating compressors, pumps and other devices to provide a hermetic seal for piston-driven gas compression.
	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.
	Directional Valves		Directional valves direct or prevent flow through selected passages.
	Excess Flow Valves (EFV)		Excess flow valves are application-specific valves that are used to shut off flow in the event of an unusually high flow condition.
	Float Valves		Float valves automatically open or close as the level of a fluid changes. A float that rests on the top of the liquid operates these valves mechanically.
	Gate / Knife Valves		Gate or knife valves are linear motion valves in which a flat closure element slides into the flow stream to provide shut-off. Gate valves are usually divided into two types: parallel and wedge-shaped. The parallel gate valve uses a flat disc gate between two parallel seats, upstream and downstream. Knife valves are of this type, but with a sharp edge on the bottom of the gate to shear entrained solids or separate slurries. Advantages include the ability to cut through slurries. Large sizes are commonly available. Disadvantages include pressure limitations, lack of cleanliness, and low shut-off.
	Globe Valves		Globe valves are linear motion valves with rounded bodies, from which their name is derived. They are used widely in industry to regulate fluid flow in both on/off and throttling service. Advantages include precise throttling and control, as well as high-pressure limits. Disadvantages include low cleanliness and the inability to handle slurry.
	Injection Valves		Injection valves are actuated valves that inject a controlled amount of fluid into a tank or process.
	Line Blinds		Line blind valves are used when assurance of no downstream leakage is required. A solid plate is placed in the flow path to prevent leakage. Any leakage that could occur will be outside of the flow path.
	Metering Valves		Metering valves are capable of accurately controlling the flow of a fluid.
	Mixing Valves		Mixing valves combine the flows of two or more inlets into a single outlet for applications such as temperature or concentration control.
	Needle Valves		Needle valves have a slender, tapered point at the end of the valve stem that is lowered through the seat to restrict or block flow. Fluid flowing through the valve turns 90 degrees and passes through an orifice that is the seat for a rod with a cone shaped tip. These small valves are widely used to accurately regulate the flow of liquids and gases at low flow rates. The fine threading of the stem and the large seat area allow for precise resistance to flow. Advantages: Precise control. Disadvantages: low-pressure limitations, no slurries.
	Pilot Valves		Pilot valves are small valves that are used to operate larger valves. They generally require less applied power to turn the larger valve than if the larger valve was operated independently. Solenoid valves are often used as pilot valves.
	Pinch Valves		Pinch valves include any valve with a flexible elastomer body that can be pinched closed, cutting off flow, using a mechanism or fluid pressure. Pinch valves are full bore, linear action valves so they can be used in both an off/on manner or in a variable position or throttling service. Some typical applications for pinch valves are medical, pharmaceutical, wastewater, slurries, pulp, powder and pellets. They can effectively control the flow of both abrasives and corrosives, as there is no contact between metal parts and the transport media. Advantages: Streamlined flow, high coefficient of flow. Disadvantages: limited materials, low shut-off capabilities, low pressure limits.
	Piston Valves		Piston valves control fluid flow within a tube or pipe by motion of a piston moving in a linear path.
	Plug Valves		Plug valves, also called cock or stop-cock valves, date back to ancient times, where they were developed for use in citywide Roman plumbing systems. Today, they remain one of the most widely used valves for both on/off and throttling services. Their design is fairly simple; the body is comprised of three main parts: body, cover and plug. The plug is a cylindrical, tapered, or generally cone-shaped device that can be raised or lowered within the seat to maintain, restrict or completely shut off flow. The valve is opened by rotation with the plug itself being the only element that is capable of movement. Advantages: Easy operation, medium to high flow, good shut off. Disadvantages: Low cleanliness, inability to handle slurry.
	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.
	Pressure Relief Valves		Pressure relief valves are self-actuated safety valves designed to relieve excess upstream pressure from the line.
	Regulators		Regulators maintain a constant outlet pressure.
	Safety Valves		Safety valves contain a thermal sensing component that opens or closes in response to temperature changes or close a line and stop the flow of material when a pre-set condition occurs.
	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.
	Shut Off Valves		Shut off valves close a line to stop the flow of material when a pre-set condition occurs such as excess flow or a pressure pulse from a broken line or a temperature change from an idle burner.
	Solenoid Valves		Solenoid valves are electro-mechanical devices that utilize a solenoid to control valve activation.
	Spool Valves		Spool valves use a rotary or piston-like spool for actuation. The spool, or spools, rotate or slide back and forth to block and uncover ports in the housing.
	Toggle Valves		Toggle valves are used for on-off control in moderate pressure and temperature applications. They feature a toggle mechanism for valve actuation.
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Specifications


	Valve Size		Valve size is the designated size of the valve by manufacturer. This typically represents the size of the passage opening.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Flow (Cv)		The valve flow coefficient is the number of U.S. gallons per minute of 60 degree F water that will flow through a valve at a specified opening with a pressure drop of 1 psi across the valve. It is used to predict flow rates.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Pressure Rating		Maximum safe pressure value for which the valve is rated.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Media Temperature		Maximum temperature of media the valve is designed to accommodate.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

Connection


	Connection
	Your choices are...
	Threaded		The valve has internal or external threads for inlet or outlet connection(s).
	Compression Fitting		A sealed pipe connection without soldering or threading. As the nut on one fitting is tightened, it compresses a washer around the second pipe, forming a watertight closure.
	Bolt Flange		The valve has a bolt flange(s) for inlet or outlet connection.
	Clamp Flange		The valve has a clamp flange(s) for inlet or outlet connection.
	Union		The valve has a union connection for inlet or outlet connection(s).
	Tube Fitting		The valve has a connection for directly joining tubing at the inlet and/or outlet connections.
	Butt Weld		The valve has a butt weld sized connection for inlet or outlet connection.
	Socket Weld / Solder		The valve has a socket weld connection for inlet or outlet connection.
	Metal Face Seal		The valve has a metal gasket sandwiched between two fitting parts. The gasket forms a face seal on each side of the fitting.
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Actuation



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	Manual / Hand		The valve is actuated (opened or closed) via a hand operated wheel or crank.
	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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Air Valves Specifications

Valve Type:

Valve Size:

Flow (Cv):

Pressure Rating:

Media Temperature:

Connection:

Actuation:

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