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John Guest 3/8" PF - 3/8" NPTF Shut-Off Valve is designed for safely stopping or continuing the flow of hazardous fluids or external gases. Its purpose is to safely stop or continue the flow of hazardous fluids or external gases. A shut off valve may be referred to by a variety of names. There are many other names for the same item: lockout valve, shutoff valve, emergency shutdown valve, ball valve, and exhausting ball valve. All of these words refer to the same thing in different situations.
The normally closed form of shut-off valves is operated by a second kind of actuation, which is described below. The larger shut off valves are held in the closed position by a piston or two pistons each. When the air pressure is supplied once again, the valve is activated. The air pressure, on the other hand, does not open the valve this time.
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