Types of valves

1. 4-stroke cycle engine valves, Aspin valve, a cone-shaped metal part fitted to the cylinder head of an engine.
2. Ball cock, often used as a water level controller (cistern).
3. Ball valve, which is good for on/off control.
4. Bibcock, provides a connection to a flexible hosepipe
5. Blast valve, used to prevent rapid overpressures in a fallout shelter or a bunker.
6. Butterfly valve, particularly in large pipes.
7. Check valve or Non-return valve, allows the fluid to pass in one direction only.
8. Cock, colloquial term for a small valve or a stopcock.
9. Demand valve on a diving regulator.
10. Diaphragm valve, a sanitary valve predominantly used in the pharmaceutical industry
11. Double check valve.
12. A flow control valve maintains a constant flow rate through the valve.
13. Foot valve, a check valve on the foot of a suction line to prevent backflow.
14. Freeze valve, in which freezing and melting the fluid creates and removes a plug of frozen material acting as the valve.
15. Gate valve, mainly for on/off control.
16. Choke valve, Is a heavy duty valve which controls flow to a certain Flow Coefficient (CV) determined by how far the valve is opened, regularly used in the Oil industry.
17. Globe valve, which is good for regulating flow.
18. A heart valve regulates blood flow through the heart in many organisms.
19. Hydraulic valve (diaphragm valve).
20. A leaf valve is a one-way valve consisting of a diagonal obstruction with an opening covered by a hinged flap.
21. Needle valve for gently releasing high pressures.
22. Pilot valves regulate flow or pressure to other valves.
23. Piston valves
24. Plug valve, for on/off control.
25. A poppet valve is commonly used in piston engines to regulate the fuel mixture intake and exhaust. The sleeve valve is another valve type used for this purpose.
26. A pressure reducing valve (PRV), also called pressure regulator, reduces pressure to a preset level downstream of the valve.
27. A pressure sustaining valve, also called back-pressure regulator, maintains pressure at a preset level upstream of the valve.
28. Presta and Schrader valves are used to hold the air in bicycle tires.
29. A 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.
30. A regulator is used in SCUBA diving equipment and in gas cooking equipment to reduce the high pressure gas supply to a lower working pressure
31. Rotary valves and piston valves are parts of brass instruments used to change their pitch.
32. A saddle valve, where allowed, is used to tap a pipe for a low-flow need.
33. A safety valve or relief valve operates automatically at a set differential pressure to correct a potentially dangerous situation, typically over-pressure.
34. Schrader valves are used to hold the air inside automobile tires.
35. Solenoid valve, an electrically controlled hydraulic or pneumatic valve.
36. Stopcocks restrict or isolate the flow through a pipe of a liquid or gas.
37. Tap (British English), faucet (American English) is the common name for a valve used in homes to regulate water flow.
38. Thermostatic Mixing Valve
39. A three-way valve routes fluid from one direction to another.
40. Some trap primers either include other types of valves, or are valves themselves
41. Vacuum breaker valves prevent the back-siphonage of contaminated water into pressurized drinkable water supplies.

Cute Valve

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Valve-Beautiful Valve

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Valve Clock

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Valve

In mechanical engineering, a device for controlling the flow of fluids (liquids, gases, slurries) in a pipe or other enclosure. It exerts control by means of a movable element that opens, shuts, or partially blocks an opening in a passageway. Valves are of seven main types: globe, gate, needle, plug (cock), butterfly, poppet, and spool. Some valves operate automatically; check (or nonreturn) valves, for example, are self-acting valves that permit flow in only one direction. Safety valves open at a predetermined pressure; the movable element usually has a weighted lever or a spring strong enough to hold the valve closed until a particular pressure is reached.

Valve

What is Valve?

A flow-control device. Valves are used to regulate the flow of fluids in piping systems and machinery. In machinery the flow phenomenon is frequently of a pulsating or intermittent character and the valve, with its associated gear, contributes a timing feature.
The valves commonly used in piping systems are gate valves (Fig. 1), usually operated closed or wide open and seldom used for throttling; globe valves, frequently fitted with a renewable disk and adaptable to throttling operations; check valves, for automatically limiting flow in a piping system to a single direction; and plug cocks, for operation in the open or closed position by turning the plug through 90° and with a shearing action to clear foreign matter from the seat. Safety and relief valves are automatic protective devices for the relief of excess pressure.

Valve Introduction

A Valve element represents a component that will be inserted into the request processing pipeline for the associated Catalina container (Engine, Host, or Context). Individual Valves have distinct processing capabilities, and are described individually below.

The description below uses the variable name $CATALINA_HOME to refer to the directory into which you have installed Tomcat 5, and is the base directory against which most relative paths are resolved. However, if you have configured Tomcat 5 for multiple instances by setting a CATALINA_BASE directory, you should use $CATALINA_BASE instead of $CATALINA_HOME for each of these references.