When the handle is in line with the pipe, the valve is open.
The position of the handle indicates the direction of the opening through the ball, IE. handle in line with pipe, valve is open, tangent to pipe, valve is closed.
If a globe valve is the same as a ball valve and your question is how does it work to stop the flow of water? There is a ball inside the valve that has a hole through the center in the same direction as the handle. When you turn the handle, the hole closes and seals against the sides of the valve.I Globe Vavle is not the same as a Ball Valve. A Globe Valve has a disc that closes an opening and can be used to throtle the flow. A Ball Vavle is as described above. The Globe Vavles usually have a wheel type valve handle and a ball valve has a lever type handle.
In a single handle faucet the mechanical principle is a ball valve one. This is where the ball valve acts to cut off whichever type of water is not wanted so the correct water comes out.
The handle faces the direction of flow
Turn the water off to the faucet. Remove the handle. The top of the faucet should unscrew to get to the ball valve. Replace the valve and gaskets then reassemble the faucet.
Ball valves: The handle will be parallel to the pipe when on and perpendicular when off. Gate valve: Clockwise off, Counter-Clockwise on.
carseal closed
A valve in the Plumbing sense is a mechanical device to open or close the water flow. It can be a screw operation called a 'Gate Valve' or a simple 1/4 turn handle called a 'Ball Valve' . These are more modern and efficient.
The type of operation for a gate valve is that it has a turn screw handle and when looking inside the valve it appears as though a coin like object is closing in on the gap where the water would be passing through and shuts the water off. A slide valve type operation is when the handle is not screw type but has a handle that turns from side to side with a maximum adjustment of 90 degrees. When looking inside the valve it appears as though a ball is being turned 90 degrees which closes the water off.
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An air valve is a spring loaded plastic valve for ventilation. A gate valve is an old fashioned type of water valve where turning a handle lowers a blocking gate over the water inlet. Any sensible plumber now uses ball valves instead.
in open condition the valve handle lever indicates the upstream end of a ball valveANS 2 - Most ball valves where that matters will have an arrow embossed on the valve body. In the case of many ball valve flow direction is immaterial.