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John Guest 3/8" PF Shut-Off Valve is designed for shutting off or continuing the flow of hazardous fluids or external gases are intended to halt or continue the flow safely. There are many names for a shut off valve. Lockout valve, cutoff valve, shutdown valve, emergency shutdown valve, ball valve, and exhausting ball valve are various terms that describe the same thing in different contexts.
The usually closed form of shut-off valves operates via a second kind of actuation. A piston or two pistons hold the bigger shut off valves in the closed position. When air pressure is applied once again, the valve opens. This time, however, air pressure does not open the valve.
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