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2. List of valves - Wikipedia

   en.wikipedia.org/wiki/List_of_valves

   Pilot valve: regulates flow or pressure to other valves; Petcock, a small shut-off valve; Pinch valve, "beach ball valve": simple, single-part two-port check valve made from soft plastic and molded onto inflatable units such as beach balls, air mattresses, water wings; can be inflated by pump or by mouth

3. Plug valve - Wikipedia

   en.wikipedia.org/wiki/Plug_valve

   The simplest and most common general type of plug valve is a 2-port valve [1] [2] with two positions: open to allow flow, and shut (closed) to stop flow. Ports are openings in the valve body through which fluid can enter or leave. The plug in this kind of valve has one passageway going through it.

4. Valve - Wikipedia

   en.wikipedia.org/wiki/Valve

   The shut off butterfly valve for a Francis turbine at Gordon Power Station, Tasmania Ball valve The "seat" is the interior surface of the body which contacts the disc to form a leak-tight seal. In discs that move linearly or swing on a hinge or trunnion, the disc comes into contact with the seat only when the valve is shut.

5. Petcock - Wikipedia

   en.wikipedia.org/wiki/Petcock

   A petcock is a small shut-off valve used to control the flow of liquid or gas.Historically, petcocks were threaded valves controlled by a butterfly handle; [citation needed] modern petcocks are typically ball valves.

6. Needle valve - Wikipedia

   en.wikipedia.org/wiki/Needle_valve

   Since the orifice is small and the force advantage of the fine-threaded stem is high, needle valves are usually easy to shut off completely, with merely "finger-tight" pressure. The spindle and/or seat of a needle valve, especially one made from brass , are easily damaged by excessive turning force when shutting off the flow.

7. Isolation valve - Wikipedia

   en.wikipedia.org/wiki/Isolation_valve

   Isolation valves must effectively stop the passage of fluids. [4] Gate valves, ball valves and plug valves are generally considered to provide tight and effective shut-off. Globe valves and Butterfly valves may not be tight shut-off due to wear on the plug or the seat, or due to their design, and may not be appropriate to provide effective ...