Pump discharge check the cause of the pneumatic valve installation, selection and installation requirements

Export of high pressure water pump, can be directly sent to the boiler, can also be sent to the mother and high pressure pipe connected to a pipe or sent to the cistern. For some reason, in the operation of the pump suddenly stopped running, disappear within the pump pressure, connected to the pump export of high pressure water will reverse flow back into the pump. Export pump with check pneumatic valve ( Non-return pneumatic valve) , it will immediately shut down, to prevent reverse flow back high-pressure water pump. If the pump outlet not install check pneumatic valve ( Non-return pneumatic valve) , high pressure water will reverse flow back to pump, pump impeller under the impact of the high pressure water produce reversal. Impeller for high pressure water under impact load, serious when the impeller or other parts loose or damage; Reduce the water pressure mother tube, boiler water level drops, etc. , affect the safe operation.




1。 Pump outlet check pneumatic valve ( Non-return pneumatic valve)
in the selection of pump station engineering general situation, for the pump outlet check pneumatic valve ( Non-return pneumatic valve) Choice, should follow the following principles;
the pump discharge pipe diameter smaller pipe, namely DN< 50 mm, should choose aerodynamic lift check valve ( Non-return pneumatic valve) 。
the pump discharge pipe diameter DN of 50 mm or line, should choose swing check pneumatic valve ( Non-return pneumatic valve)

swing check pneumatic valve ( Non-return pneumatic valve) Can be installed in a horizontal or vertical. Swing check pneumatic valve ( Non-return pneumatic valve) Pneumatic disc around the axis of rotation, the fluid resistance is generally less than the aerodynamic lift check valve ( Non-return pneumatic valve) , it is suitable for large caliber of occasions, the installation position is not restricted, are normally installed in horizontal pipe, which applies with the occasion of the large diameter. According to the number of the pneumatic valve can be divided into single swing, more than double disc swing and swing three segments. Single swing check pneumatic valve ( Non-return pneumatic valve) General use and medium caliber. Large diameter pipeline to choose single swing check pneumatic valve non-return valve) , to reduce the pressure of water hammer, and recommended to reduce the water hammer pressure slowly-closing check pneumatic valve ( Non-return pneumatic valve) 。 Double disc swing check pneumatic valve ( Non-return pneumatic valve) Apply to large and medium diameter pipeline. The pneumatic valve, double valve swing check valve ( Non-return pneumatic valve) Small structure, light weight, it is a kind of quick check pneumatic valve ( Non-return pneumatic valve) ； Many disc swing check pneumatic valve ( Non-return pneumatic valve) Suitable for large diameter pipeline.




2. Pump outlet check pneumatic valve ( Non-return pneumatic valve) Installation

check pneumatic pump valve with different installation method:


1, swing check, pneumatic valve, swing check pneumatic valve pneumatic valve disc shaped, pneumatic seat around the tunnel axis rotation, because of the channel into a streamline of the pneumatic valve, flow resistance than the aerodynamic lift check valve is small, suitable for low flow velocity and flow not often change the large diameter of occasions, but should not be used for oscillating flow, its sealing performance than lift. General installation in horizontal pipe runs that caliber DN80mm check pneumatic valve and above, also can be installed in vertical or upward sloping line.


2, lift check pneumatic valve, pneumatic valve pneumatic valve body along the vertical centerline of sliding check pneumatic valve and lift check pneumatic valve installed in horizontal pipe runs with the high pressure on small check pneumatic valve pneumatic valve can be used. Lift check pneumatic valve pneumatic valve body shape as well as by the pneumatic valve ( To stop pneumatic valve general) Fluid resistance coefficient is larger, so it.
the structure similar to stop pneumatic valve, pneumatic valve body and disc is the same as the cut-off pneumatic valve. Pneumatic valve upper part and lower part of the pneumatic valve cover processing has a guide sleeve, Jane Jane pneumatic disc guide can be freely within the pneumatic valve light guide Jane, when medium downstream, pneumatic disc by medium thrust open, when stop the flow of medium, landing on the hanging in the pneumatic pneumatic valve seat valve, prevent medium counter-current role.
cut-through lift check pneumatic valve medium import and export of the channel direction and pneumatic seat vertical direction; Vertical lift check pneumatic valve, its media channel direction and pneumatic valve seat in the same direction of imports and exports, its a straight-through flow resistance is small.


3, disc check pneumatic valve, pneumatic disc around a pneumatic seat inside the pin shaft rotation check pneumatic valve. Disc check pneumatic valve has simple structure and installation in horizontal pipe runs with poor sealing.


4, pipeline check pneumatic valve, pneumatic valve disc sliding along the center line of the pneumatic valve pneumatic valves. Pipeline check pneumatic valve is a new kind of pneumatic valve and its small size, light in weight and good fabrication procedure, check the pneumatic valve is one of development direction. But fluid resistance coefficient than the swing check valve is slightly larger.


5, the compression type check pneumatic valve: this pneumatic valve is used as boiler feed water and steam to cut off the pneumatic valve, it can lift check pneumatic valve pneumatic valve and globe or Angle valve of the comprehensive function.