Detailed introduction
Overview and Application
The function of the cast steel check valve with bolted bonnet is to control the one-way flow of the medium in the pipeline to prevent the backflow of the medium in the pipeline. Check valves are automatic valves. The opening and closing parts open or close by themselves based on the force of the flowing medium. Check valves are only used on pipelines with one-way flow of media to prevent backflow of media to prevent accidents. Mainly used in petroleum, chemical, pharmaceutical, electric power and other pipelines.
Features
Valve seat: The sealing surface is surfacing-welded, which is easy to replace and can reduce the deformation of the valve seat caused by external pressure. The surface material of the valve seat is Stellite alloy, which is firmly welded to the valve body. The hard-treated valve seat surface ensures good wear resistance and corrosion resistance of the valve, extending the service life of the valve.
Valve body: It is spherical (large radius), so it can reduce the pressure and minimize the impact of water hammer by reducing the opening angle of the valve disc.
Stop bolt: Stud bolts are used to reinforce the valve seat connected to the pressure seat.
Graphite sealing ring: It can maintain good sealing effect under low pressure and high pressure, even under instantaneous high pressure and high temperature conditions.
Process hole: Insert the demoulding pin to easily remove the retaining ring from the ring groove. Valve disc nut assembly: Use positioning screws to ensure a solid connection between the hinge and the disc nut; in the absence of media flow, the valve disc Can be tightened and closed by itself
Seal ring retaining ring: adopts 4-piece split structure to maintain internal pressure and facilitate disassembly
Swing check valve is used to automatically open when the flow is forward and automatically close when the flow is countercurrent.
The swing check valve can be installed on either a horizontal pipeline or a vertical pipeline (in this case, the medium flow direction must be bottom-up)
In order to avoid surge phenomenon, the disc opening angle of the swing check valve remains above 10 degrees at the minimum flow rate.
Swing check valve has the advantages of light weight, simple maintenance and relatively low cost.