Gate valves - body and runner

The structure of the gate valve body is determined by the connection between the valve body and the pipe and the valve body and the valve cover. In terms of manufacturing methods, there are several kinds, such as casting, forging, forging welding, casting welding and tube-plate welding. Forged valve body has developed to the direction of large diameter, and casting valve body gradually developed to the small diameter. Any kind of gate valve body can be forged, can also be cast, should be based on customer requirements and manufacturers have the means of manufacturing.

Gate valve body flow can be divided into, full size type and reduced size type. Flow aperture and valve nominal warp, basically the same for the full size; The flow aperture smaller than the nominal diameter of the valve is called the reduction type. There are two kinds of uniform shrinkage and uniform shrinkage. The tapered flow is a non-uniform shrinkage, where the inlet bore is essentially the same as the nominal size and is gradually reduced to a very small size at the seat. Tianjin gate valves

The use of reduced flow path (whether taper pipe type non-uniform diameter or uniform diameter), its advantage is the same specification of the valve, can reduce the size of the gate, opening and closing force and torque; The disadvantages are increased flow resistance, pressure drop and energy consumption, so the shrinkage cavity should not be too large. For tapered sizes, the ratio of seat bore to nominal size is usually 0.8 to 0.95. For reduced valve with nominal diameter less than 250mm, the seat inner diameter is generally one step lower than the nominal diameter; Reduced valve with nominal size or greater than 300mm shall generally have a seat bore size second lower than nominal size.