Check valve

Check valve has two types of body cover connection design forms: the first is a body cap bolt connection check valve, forged steel valve design in this connection, the valve and bonnet bolting, spiral wound gasket seal, the advantage is easy to maintenance; Second all-welded body cover seal, forged steel check valve according to this form of connection design of valve, the valve body and valve cover with a screw mosquito connection, all-welded seal, advantage is without leakage. Forged steel check valve disc form also respectively have the closure, needle and ball you can reasonable choice according to the actual situation of our valves.
Check valve, check valve and check valve, one-way valve or check valve, its purpose is to prevent the backflow medium pipeline directional flow without function. Water pump suction pipe of bottom valve also
As part of the check valve. Check valve according to the structure division, may divide into the lift check valve, swing check valve and butterfly check valve in three. Lift check valve can be divided into vertical and horizontal two kinds. Swing check valve can be divided into single and double disc type and valve type 3 kinds. Butterfly check valve for straight-through processing, the above several kinds of check valve in the connection form can be divided into the thread connection, flange connections and welding of three.
Open-close part on media flows and forces open or closed by oneself, in order to prevent the backflow china check valve. Check valve belong to automatic valve class, mainly for the one-way flow of medium pipeline, only allowed to medium flows in one direction, in order to prevent accidents.
Check valve: according to the structure division, may divide into the lift check, swing check valves, and butterfly check valve in three. Lift check valve can be divided into vertical and straight-through type two kinds. Swing check valve can be divided into single and double disc type and valve type 3 kinds. Butterfly check valve for butterfly valve, butterfly single, the above several kinds of check valve in the connection form can be divided into the thread connection, flange connection, welding and clamp connection of four.
Check valve installation should pay attention to the following: do not make the check valve in the pipe to bear weight, large check valve shall be independent of the support, make it not influenced by pressure generated in the pipeline system. When installation should pay attention to the medium flow direction and the direction the arrow by valve body. Vertical elevating disc check valve should be installed in vertical pipe runs. Elevating the level valve check valve should be installed in horizontal pipe runs.
China valve: is the Valve can automatically prevent fluid backflow. Check valve disc opened under the action of a fluid pressure, fluid from the inlet side towards the export side. When import the lateral pressure is lower than the export side, the disc in the fluid pressure difference, itself under the action of gravity factors such as shut down automatically to prevent fluid backflow.
Check Valve : generally divided into lift, swing, butterfly and four types such as horizontal.
Lift check valve general similar to as, the structure of the disc along the channel in a line for lifting movement, the movement is reliable, but the fluid resistance is larger, light is suitable for small diameter. Lift check valve can be straight-through and vertical two kinds. Straight-through normally only lift check valve installed in horizontal pipe, and the vertical lift check valve is generally installed in a vertical line.
Swing check valve disc around the axis of rotary motion. The fluid resistance is generally less than lift check valve, it is suitable for large caliber of occasions. Swing check valve according to the number of the disc can be divided into single swing swing, double disc and disc swing three more. Single swing check valves are generally applicable to medium caliber,automatic pump recirculation valve.
Large diameter single swing check valve is used in the pipeline, to reduce the water hammer pressure, had better use can reduce the water hammer pressure slow closing check valve. Double disc swing check valve applicable Yu Dazhong diameter pipe. Double disc swing check valve to the clamp structure is small, light, is a kind of check valve fast development; More disc swing check valve is suitable for large diameter pipeline.