Reciprocating pumps can not regulate the flow by reducing the outlet valve, which can waste energy and can even overload the drive. It generally uses the following methods to adjust the flow: First, the bypass adjustment set by-pass pipe, regulating the size of the opening of the bypass valve, so that the liquid discharged back to the suction pipe to regulate the discharge of the pump flow. The electric reciprocating pump should be set safety valve, when the exhaust pipe pressure is high, the safety valve opens, so as not to pump and prime mover overload. Second, change the pump speed From the reciprocating pump flow formula can be seen, the use of variable speed motor pump speed can be adjusted to achieve the purpose of traffic. Third, change the piston or plunger stroke (stroke) Change the eccentricity, plunger air travel, connecting rod length and position of linkage to change the piston or plunger stroke to change the pump flow. Fourth, open the top of the suction valve to adjust the flow motor reciprocating pump can be used to open the pump suction valve, the suction cylinder liquid in the return stroke from the suction valve back to the suction tube, thereby reducing the discharge flow.
