WAM WAM manual unloading valve manual unloading valve to high temperature, higher pressure range, the valve nominal diameter large, carbon steel valve body, valve plate seal with a metal ring to replace the rubber ring. Large temperature valve welded steel plate manufacturing, mainly for duct smoke and gas pipelines hot medium. WAM manual discharge butterfly valve aluminum alloy, carbon steel valve plate, BNR rubber seals, covered with wear-resistant polymer materials processing. There are manual, electric, compressed air driven, gear motor drive and other drives can be mutually exchanged. Compact, easy to install, sealing effect is significant, long service life. When WAM manual valve in the discharge opening, the shape of the body and disc opening formed in the front end of the valve shaft as the center, formed on both sides to complete the different states, the disc along the flow direction of the front side of the wings, the other side countercurrent direction moving water, so one side of the body and the valve plate is formed like a nozzle-shaped openings, similar to the other side of the orifice-shaped openings, fast nozzle orifice side than the side of the flow rate, and the throttle valve side will produce the following negative, often have rubber seals off. WAM manual unloading valve butterfly valve is composed of two, in the middle of a valve plate, which has an intermediate ring, valve plate has a splined shaft, spline shaft has a scope is used to connect one end of the cylinder (pneumatic actuators): concrete mixing stations and dry powder.