The noise of the pump is likely to have the following reasons:

(1) The impact of the cylinder body, the residual volume of the pump pump and the sound oil in the stress oil in the exhaust gap;

(2) The impact of the valve sheet on the valve seat and supporting parts;

(3) The echo and bubble rupture in the box;

(4) Bearing noise;

(5) Noise caused by a large amount of gas, oil shock oil board, etc.;

(6) Others. Such as the noise caused by the transmission, the fan noise of the air -cooled water pump, etc.

(7) Electric noise, this is a vital factor.