Before starting to use the pressure test pump, it should first check and adjust whether there is loosening of the connecting parts everywhere. Whether the intake and outlet pipes are unblocked and the water in the water tank is clean, it is strictly forbidden to use the sewage containing fibre and sediment impurities to prevent the impact on the performance of the pump. After checking and adjusting, the pressure test vessel will be connected with the work takeover. Close the drain valve needle, open the control valve needle, and then operate the handle floating up and down, trying to avoid impact evenly, so that the plunger does reciprocating motion, the water in the tank is sucked into the low-pressure cylinder through the suction pipe, into the high-pressure cylinder and the controller, from the working nozzle into the pressure vessel under test, the pressure value can be read from the pressure gauge. Pressure test shall be carried out within 2/3 of the maximum indicated value of the pressure gauge. The maximum working pressure shall not exceed the rated discharge pressure specified by this type of pressure test pump.
When the pressure of the low pressure cylinder is greater than 0.3 Mpa, the countercurrent valve is opened to drain the excess water back into the water tank.
The control valve handwheel can be tightened when the tested pressure vessel needs to be kept at a certain pressure for a period of time. Close the control needle to isolate the tested pressure vessel from the pump, so that the pressure value of the pressure vessel can be read more accurately. If leakage is found in the process of pressure test, it is necessary to stop immediately for repair. It is strictly forbidden to continue to increase pressure in case of leakage. After the pressure test, the control valve needle should be loosened first, and then the water needle should be loosened. When loosening the handwheel, it should be slowly and evenly, so as to avoid the damage caused by sudden opening of the needle.
