How to select suitable kinds of valves ?

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Types of valves


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Valves are quite diverse and may be classified into a number of basic types. Valves may also be classified by how they are actuated: Hydraulic Pneumatic Manual Solenoid Motor [edit] Basic types All valves can be categorized into the following basic types: Ball valve, for on/off control without pressure drop. Butterfly valve, for flow regulation in large pipe diameters. Choke valve, a valve that lifts up and down a solid cylinder which is placed around or inside another cylinder which has holes or slots. Used for high pressure drops found in oil and gas wellheads. Check valve or non-return valve, allows the fluid to pass in one direction only. Diaphragm valve, some are sanitary predominantly used in the pharmaceutical and foodstuff industry. Ceramic Disc valve, used mainly in high duty cycle applications or on abrasive fluids. Ceramic disc can also provide Class IV seat leakage Gate valve, mainly for on/off control, with low pressure drop. Globe valve, good for regulating flow. Knife valve, for slurries or powders on/off control. Needle valve for accurate flow control. Piston valve, for regulating fluids that carry solids in suspension. Pinch valve, for slurry flow regulation. Plug valve, slim valve for on/off control but with some pressure drop. Spool valve, for hydraulic control Thermal expansion valve Poppet valve Reductive "self" valve [edit] Specific types 4-stroke cycle engine valves: an application of piston valve Aspin valve: a cone-shaped metal part fitted to the cylinder head of an engine Ball cock: often used as a water level controller (cistern) Bibcock: provides a connection to a flexible hosepipe Blast valve: prevents rapid overpressures in a fallout shelter or a bunker Cock: colloquial term for a small valve or a stopcock Demand valve: on a diving regulator Double beat valve Double check valve Duckbill valve Flipper valve Flow control valve: an application which maintains a constant flow rate through the valve Heimlich valve: a specific one-way valve used on the end of chest drain tubes to treat a pneumothorax Foot valve: a check valve on the foot of a suction line to prevent backflow Four-way valve: was used to control the flow of steam to the cylinder of early double-acting steam engines Freeze valve: in which freezing and melting the fluid creates and removes a plug of frozen material acting as the valve Gas pressure regulator regulates the flow and pressure of a gas Heart valve: regulates blood flow through the heart in many organisms Leaf valve: one-way valve consisting of a diagonal obstruction with an opening covered by a hinged flap Pilot valve: regulate flow or pressure to other valves Poppet valve and sleeve valve: commonly used in piston engines to regulate the fuel mixture intake and exhaust Pressure regulator or pressure reducing valve (PRV): reduces pressure to a preset level downstream of the valve Pressure sustaining valve, or back-pressure regulator: maintains pressure at a preset level upstream of the valve Presta and Schrader valves are used to hold the air in bicycle tires Reed valve: consists of two or more flexible materials pressed together along much of their length, but with the influx area open to allow one-way flow, much like a heart valve Regulator: used in SCUBA diving equipment and in gas cooking equipment to reduce the high pressure gas supply to a lower working pressure Rocker valve Rotary valves and piston valves: parts of brass instruments used to change their pitch Rupture disc: a one time use replaceable valve for rapid pressure relief, used to protect piping systems from excessive pressure or vacuum; more reliable than a safety valve Saddle valve: where allowed, is used to tap a pipe for a low-flow need Safety valve or relief valve: operates automatically at a set differential pressure to correct a potentially dangerous situation, typically over-pressure Schrader valve: used to hold the air inside automobile tires Solenoid valve: an electrically controlled hydraulic or pneumatic valve Stopcock: restricts or isolates flow through a pipe Swirl valve: A specially designed Joule-Thompson pressure reduction/expansion valve imparting a centrifugal force upon the discharge stream for improving gas-liquid phase separation Tap (British English), faucet (American English): the common name for a valve used in homes to regulate water flow Thermal expansion valve Thermostatic Mixing Valve Thermostatic Radiator Valve Trap primer: sometimes include other types of valves, or are valves themselves Vacuum breaker valve: prevents the back-siphonage of contaminated water into pressurized drinkable water supplies

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In general, specifications, types and working pressure are always indicated when purchasing the valves. However, the information is inadequate for you to buy the suitable valves for your applications, especially in such competitive markets. In order to stand out among the competitors, each valve factory innovates the design and manufacture of the valves, though the basic standards remain the same. It leads to product variations from manufacturer to manufacturer. Therefore, it is suggested to bring up technical requirements as detailed as you can and come to consensus with the manufacturers.