Performance Characteristics And Application Of Reciprocating Pump

From the working principle of reciprocating pump, when the smaller the discharge valve to open, or the discharge pipe diameter is smaller, the more difficult it is to liquid in the pump cylinder, but the time needed for a piston reciprocating process is approximately constant, liquid is approximately incompressible, so the output liquid pressure (the head) is higher also. Its discharge pressure only depends on the working condition of discharge pipe on the road, as long as the prime motor power, the pump itself and pipe material strength enough, in theory, high reciprocating pump discharge pressure can be infinite.

The flow rate of reciprocating pump is only related to the piston diameter, stroke and the number of refill times, which is independent of the discharge pressure. It does not change as the discharge pressure changes with the centrifugal pump. The flow rate of the reciprocating pump is basically constant under any pressure in the discharge line, and the curve of the relationship between flow rate and discharge pressure is basically a straight line. So it can't regulate the flow by changing the pressure. In addition, because the flow is independent of the discharge pressure, the reciprocating pump is suitable for conveying the liquid with the change of temperature.

Reciprocating pump is relying on the piston in the pump cylinder change volume and suction and discharge of the liquid, when working population and outlet is the spacing between each other is not same, so the pump when it starts to smoke inhalation tube air gradually on the side by side, thus has self-priming capacity. For this purpose, the reciprocating pump does not need to install the bottom valve, and the pump is not filled with liquid before operation. However, in order to avoid piston and pump cylinder dry grinding, shorten starting time and start-up convenience, some also install the bottom valve in the system.