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2. Butterfly valve - Wikipedia

   en.wikipedia.org/wiki/Butterfly_valve

   Triply-eccentric butterfly valves (triple-offset butterfly valves) – the seats are either laminated or solid metal seat design. Butterfly valve with actuator electric valve - An electrically actuated butterfly valve is a quarter-turn valve controlled by an electric motor.

3. Check valve - Wikipedia

   en.wikipedia.org/wiki/Check_valve

   Large butterfly check valve for a water pump. A butterfly check valve is a variant on the swing check valve, having two hinged flaps which act as check valves to prevent backwards flow. It should not be confused with the similarly named butterfly valve, which is used for flow regulation and does not have a one-way flow function.

4. Flow control valve - Wikipedia

   en.wikipedia.org/wiki/Flow_control_valve

   Control valves are normally fitted with actuators and positioners. Pneumatically-actuated globe valves and diaphragm valves are widely used for control purposes in many industries, although quarter-turn types such as (modified) ball and butterfly valves are also used. Control valves can also work with hydraulic actuators (also known as ...

5. List of valves - Wikipedia

   en.wikipedia.org/wiki/List_of_valves

   Choke valve, Butterfly valve used to limit air intake in internal combustion engine. (Not to be confused with choke valves used in industrial flow control, above.) Clapper valve: a type of check valve used in the Siamese fire appliance to allow only one hose to be connected instead of two (the clapper valve blocks the other side from leaking out)

6. Backflow prevention device - Wikipedia

   en.wikipedia.org/wiki/Backflow_prevention_device

   Backflow prevention device. The simplest, most reliable way to provide backflow prevention is to provide an air gap.An air gap is simply an open vertical space between any device that connects to a plumbing system (like a valve or faucet) and any place where contaminated water can collect or pool.

7. Control valve - Wikipedia

   en.wikipedia.org/wiki/Control_valve

   Shut-off / On-off valve: These valves are either completely open or closed. Examples: Gate valve, ball valve, globe valve, angle valve, pinch valve, diaphragm valve; Check valve: Allows flow only in a single direction; Steam conditioning valve: Regulates the pressure and temperature of inlet media to required parameters at outlet.