The large diameter manual valves and the valves used in high pressure applications come equipped with a reduction gear to ease the operation. Manual valves can also be fitted with a chain wheel and extended stem. Technical specifications Size range: 15~2000mm, ~84in Pressure range: 1-10MPa, 1:2 safety factor, which means bursting pressure is 2 times higher than the operating pressure. Material of valve body DN15~200 (carbon steel, ductile  iron, aluminum alloy, stainless steel-casting process) DN250~2000 (45#steel, stainless steel welding technology ) Material of valve sleeve: NR, EPDM, CR(chloroprene rubber), NBR, butyl rubber, FPM, Hypalon rubber. Working status of pinch valve Fully-open: the full-bore elastic valve sleeve of pinch valve without any gaps & dead spots. Center closed: closed on the center line of the valve body, which avoids turbulence and abrasion, as a result, the valve sleeve becomes a smooth and enclosed venturi with self-cleaning during every operation. Fully-closed: it ensures the pinch valve is with no leakage of two ways when shut off, and the safe design of inner valve sleeve requires no maintenance of sealing elements.
