To make it simpler a shut off valve is a mechanism that cuts off the water supply to a pipe once activated.
Plastic toilet shut off valve types.
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Your gas tank at home uses this mechanism too.
As these valves get older and fixed in the on position they tend to leak when actually used to shut the water supply off.
However shut off valves are not exclusive to plumbing systems.
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When the valve is off the gate blocks the flow of water.
They re also used to regulate the flow of gases.
Just like the ball valve the gate valve is an all or nothing valve designed to either allow full flow or shut it off completely.
It requires several turns of the stem to shut off the water flow.
The main water shut off valve stops the flow to the entire home from the water meter while other water valve types shut off the water at individual appliances fixtures and faucets.
Residential plumbing systems can contain several different types of water shut off valves that control water flow.
The multi turn valve stop is marginally cheaper than a quarter turn valve and is made with a plastic stem and compression washers.
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A shut off valve is a valve that stops the flow of fluid in a plumbing system.