What is the shell and seal of the valve?
The general valve body (including the valve cover some points), valve seat, valve core (or valve plate, valve inside that gate), stem (or not), actuator, positioner, accessories (filter valve, solenoid valve, seal etc.).The valve pressure test (pressure test) is divided into 1. shell tests. 2. sealing test. 3. sealing testShell test: open the valve, the valve pipe inlet and outlet, (note that put the stem opening blocked or compression packing gland in the flange, import or export blocked on the left eye, inside water, usually water.) Draw water gradually into it, increase to a certain pressure, and see if there is eye leakage on the case.The seal test: open the valve, the valve pipe inlet and outlet, what are installed (on the stem seal check is to look at the stem and valve body sealing contact place is good), with top, also from the side to inside the water, or air (air to play the entire valve in water look, don't take bubble). Look at the leak between the stem and the valve.Seal test: close the valve, plug valve inlet (outlet without blocking), from the inlet valve blocked the small eyes to water or air, at the exit to see if you can come to water or air (air can not see, you have to put the valve in the water, look at the export risk not bubble.
The shell of the valve is worth the whole outer structure, such as the ball valve, the shell refers to the valve body and the left and right bodies, and the seal has different sealing surfaces according to different structures,
The valves are divided body (some of which included the valve cover), valve seat, valve core (or valve plate, valve inside that gate), stem (or not), actuator, positioner, accessories (filter valve, solenoid valve, seal etc.).?The valve pressure test (pressure test) is divided into 1. shell tests. 2. sealing test. 3. sealing testShell test: open the valve, the valve pipe inlet and outlet, (note that put the stem opening blocked or compression packing gland in the flange, import or export blocked on the left eye, inside water, usually water.) Draw water gradually into it, increase to a certain pressure, and see if there is eye leakage on the case.The seal test: open the valve, the valve pipe inlet and outlet, what are installed (on the stem seal check is to look at the stem and valve body sealing contact place is good), with top, also from the side to inside the water, or air (air to play the entire valve in water look, don't take bubble). Look at the leak between the stem and the valve.Seal test: close the valve, plug valve inlet (outlet without blocking), from the inlet valve blocked the small eyes to water or air, at the exit to see if you can come to water or air (air can not see, you have to put the valve in the water, look at the export risk not bubble.
