Ball valve, standard GB/t21465-2008 "valve terminology" is defined as: the open (sphere) is driven by the stem and is rotated around the axis of the ball valve. Can also be used on regulation and control of fluid, including hard seal ball valve v-shaped the v-shaped ball core of carbide surfacing with strong shear force between metal valve seat, especially suitable for fiber, tiny solid material, such as medium. The multi-pass ball valve can not only flexibly control the confluence, shunt and flow direction of the medium, but also can close any channel and connect the other two channels. This valve is normally installed horizontally in the pipe. Ball valves are divided into: pneumatic ball valve, electric ball valve, manual ball valve.

Test pressure of ball valve:

The strength test of the pneumatic ball valve shall be carried out in the half-open position of the ball.

Floating ball valve sealing test: the valve is in half open, one end is in the test medium, the other end is closed. Turn the ball several times, open the closed end check when the valve is closed, and check the sealing performance of packing and gasket, no leakage. Then the test medium was introduced from the other end.

Fixed ball valve sealing test: before the test, the ball valve is turned off a few times, and the fixed ball valve is in a closed state, from the end of the test medium to the regulation value; The pressure gauge is used to check the performance of the incoming end seal and the pressure gauge is 0.5 ~ 1, and the range is 1.5 times of the test pressure. In the specified time, no decompression phenomenon is qualified; The test medium was introduced from the other end and repeated experiments were repeated. Then, the valve is in half open, closed at both ends, and filled with medium. Check the packing and gasket under test pressure, and no leakage can be found.

The three-way ball valve should be tested in various positions.