Bellows Gate valve Opening and closing parts are plug-shaped disc, sealing the surface or cone, the disc along the center line of the fluid for linear movement. The valve stem movement form, has the lift pole type (the stem lift, the handwheel does not rise and fall), also has the elevating rotating rod type (handwheel and the valve stem rotates with the lift, the nut is located on the valve body). The pipe stop valve is only applicable to open and full off, and is not allowed for adjustment and throttling. These valves should be installed horizontally in piping.
, the pipe stop valve belongs to the mandatory sealing valve, so when the valve is closed, the valve must be pressed to force the sealing surface to be leakproof. When the medium is entered into the valve body below the disc, the operation force needs to overcome the resistance, is the valve stem and the filler friction force and the pressure from the medium to produce the thrust, the force of the valve is larger than the opening valve, so the diameter of the stem is large, otherwise the valve stem top-bending failure will occur. In recent years, from the seal of the valve, the media flow of the cut-off valve into the valve cavity above the disc, at this time under the action of medium pressure, close the valve force is small, and open the valve, the diameter of the stem can be reduced accordingly. At the same time, in the role of the media, this form of valve is also more stringent. China's valve "three to" has stipulated that the flow of the cut-off valve, the use of Top-down.
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