Reciprocating pumps can not regulate the flow by reducing the size of the outlet valve. This can waste energy and can overload the reciprocating pump drive. Reciprocating pumps generally use the following methods to adjust the flow: First, the bypass adjustment reciprocating pump set up the reciprocating pump bypass pipe, regulating the size of the opening of the bypass valve, the liquid discharged back to the suction pipe to the reciprocating pump discharge tube 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, to change the reciprocating pump speed reciprocating pump flow from the formula can be seen, the use of variable speed motor reciprocating pump speed, you can achieve the purpose of regulating the flow. Third, change the reciprocating pump piston or plunger stroke (stroke) to change the eccentricity, plunger air travel, connecting rod length and position of the link mechanism to change the piston or plunger stroke to change the reciprocating pump flow. Fourth, open the top of the reciprocating pump to adjust the flow motor can be used to open the top of the pump suction valve so that the liquid inhalation cylinder in the return stroke from the suction valve back to the suction tube, thereby reducing the reciprocating pump discharge flow.
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