Diaphragm is a special form of cut-off valve, diaphragm valve which open and close a piece is made of soft material used diaphragm, diaphragm valve body cavity and the valve cover will separate the cavity. Diaphragm is actually just a "clamp" valves, a flexible, diaphragm can be disturbed in the diaphragm, diaphragm valves connected to the compressed pieces Lo Chun, the diaphragm is compressed parts of the operation of the valve stem moves up and down diaphragm increased when the compression fittings, diaphragm to hold high, causing path, when compressed pieces falling diaphragm, diaphragm valve diaphragm on the pressure in the weir to the weir-type valve, or if pressure at the bottom contours even for straight-through, diaphragm for switching and reducing use.