Pneumatic valve outlet check effect of the centrifugal pump and selection

export check pneumatic valve effect of the centrifugal pump and centrifugal pump selection
export check the function of the pneumatic valve is to prevent the export of the liquid flow backwards to form water hammer within the pump impeller damage.
check the installation of the pneumatic valve has nothing to do with how much pump, main to check pneumatic valve after the pump stop running, prevent fluid backflow, invert the pump, causing damage to the pump of the accident, and in order to prevent the liquid flow back to other tank damage (such as From high pot back will cause the tank repair bad. So it's best to add the check pneumatic valve.
if you can guarantee to stop pump shut down before exports pneumatic valve, pneumatic valves do not leak or damage and exports. Can also check the pneumatic valve.
the pump discharge check pneumatic valves' check pneumatic valve '
in the selection of pump station engineering general situation, the pump discharge check pneumatic valve choice, should follow the following principles;
, to the pump discharge pipe diameter smaller pipe, or DN mm or less, should choose aerodynamic lift check valve.
, the pump discharge pipe diameter DN > mm line, should choose swing check pneumatic valve swing check valve can be installed in a horizontal or vertical. Swing check pneumatic valve pneumatic disc around the axis of rotation, the fluid resistance is generally less than the aerodynamic lift check valve, it is suitable for large caliber, 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 generally use pneumatic valve and medium caliber. Large diameter single swing check pneumatic valve is used in the pipeline, to reduce the water hammer pressure, had better use can reduce the water hammer pressure slowly-closing check pneumatic valve. Double disc swing check pneumatic valve with large and medium caliber pipe shall apply. The pneumatic valve, double valve swing check valve structure is small, light weight, is a kind of fast check pneumatic valve; Many disc swing check pneumatic valve applicable and large diameter pipeline.
the pump discharge check the installation of the pneumatic valve
1. Swing check pneumatic valve installed in horizontal pipe runs commonly: for check pneumatic valve diameter DN to mm, also can be installed in vertical or upward sloping line.
2. Straight through aerodynamic lift check valve should be installed in horizontal pipe runs. Vertical lift check pneumatic valve must be installed in vertical pipe runs, medium to flow from bottom to top.
(3) due to check pneumatic valve is easy to damage, therefore, should be installed near the pump discharge check pneumatic valve, the check pneumatic valve upside sets to cut off the pneumatic valve ( General pneumatic valve pneumatic valve ball or gate, convenient maintenance.
(4) to facilitate the check pneumatic pressure relief valve as before, to check the pneumatic valve itself without put the net of the pneumatic valve, pneumatic valve should be in check and to cut off the net between the pneumatic valve equipped with pressure relief it with pneumatic valve.
prevent damage of hydraulic impact to check pneumatic valve sealing surface protection
check pneumatic valve set, played to prevent the reverse material, to avoid the pump impeller liquid impact effect. Pneumatic valve itself, but just check Settings, can cause water hammer produced by the sudden impact of pneumatic disc to seat, and check the pneumatic valve sealing surface. Therefore, to some protection measures should be taken.
, to pump export setup & gt; Mm the pneumatic swing check valve, level installation, should be adopted to abate pneumatic disc return and impact.
, to pump export check pneumatic valve diameter & gt; = mm pipe, should be set up before, during, and after check pneumatic valve bypass, prevent the pneumatic valve pressure rise too high, before to check the pneumatic valve sealing surface damage.
the pump discharge line, high starting point and end point pressure piping, not allowed to bypass, can take the following measures.
set safety pneumatic valve to replace the bypass valve. Its role is similar to the bypass pneumatic valve. It set up near the check pneumatic valve outlet, when water hammer pressure, part of the water can be released in order to prevent the damage caused by the pressure continues to increase.
setting air or inert gas buffer tank. It is set in the check, the pneumatic valve exit when water hammer produced by buffer tank with pressurized gas is compressed, to mitigate water hammer pressure.
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