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(1) observe the pump operating conditions, a look at whether the pump can play the pressure is stable, with or without serious fluctuations: look at the flow meter, observe the pump displacement is reduced, if the pump pressure can not fight or Fluctuation, drainage volume decreased. On the instructions, there is a problem drainage valve. Pump should be stopped to open the pump head, pump inlet and outlet valve device.
　　
(2) Disassemble the drain valve device:
　　
(1) After stopping the pump, first close the pump inlet and outlet valves and vent pressure relief. (2) The plunger plate to the back dead center, open the pump head cover and pressure cap.
　　
(3) with a special tool to pull down the support sleeve, remove the body into the night and the valve seat, pull down the support sleeve, under the support sleeve, removed into the night body and valve seat.
　　
(4) Check the valve body, seat wear, wear is not serious Surface grinding repair, serious wear and tear can be replaced: Check the inlet and exhaust valve spring is small or damaged, check the seal ring damage.
　　
(5) assembly into the drain valve: the repair or replacement of the valve body, seat, spring, according to the reverse order of removal into the pump head, install the cover and side cover.
　　
(6) Open the pump import and export valves, pumping test run, test pump work is normal.
　　
How to replace the reciprocating pump into the drainage valve?
　　
(1) Close the inlet and outlet valves, open the connection.
　　
(2) Remove the pump head gland and gland with a wrench.
　　
(3) remove the bonnet with a special tool, drain valve, drain spring. Gland, then remove the inlet valve. Intake valve spring and valve seat, on the green shell paper.
　　
(4) Check, clean the new intake and exhaust valves and other parts to be installed.
　　
(5) will be assembled into the valve with special tools installed in the pump body ,??????????????
　　
(7) Open the inlet and outlet valves, disk pumps, start the reciprocating pump test run.
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