ADDRESS:No.9th Xiajiahe Industrial Park, Ganjingzi District, Dalian, China
① Certain pump in a certain speed or reciprocating times the flow is certain, almost do not change with the pressure.
The operating point pressure and shaft power depend on the condition of the device system connected with the pump, therefore, when the pump in the exhaust pipe (equivalent to infinite resistance of the system) operation, its pressure and shaft power will increase to make the pump or the original motive damage, so must set up a safety valve to protect the pump (steam direct action or compressed air drive pump exception).
② The flow and pressure of reciprocating pump have a big pulsation, need to take corresponding measures to reduce pulsation, rotary pump generally no pulsation or only small pulsation.
③ With self-priming ability, the pump will be able to remove the air in the pipeline after suction liquid.
④ Start the pump must be discharged pipe valve completely open.
⑤ Reciprocating pump is low-speed machinery, large size, manufacturing and installation costs are also large, rotary pump speed is higher, up to 3000 rpm.
⑥ Reciprocating pump for high pressure (up to 350 MPa) and small flow (100.3-meter/time), rotary pump for small and medium flow (400.3-meter/below) and higher pressure (35 MPa below). In general, the efficiency of the volumetric pump is higher than that of the power pump, and the efficiency curve is wider. The efficiency of reciprocating pump is generally 70~85%, the high can reach more than 90%.
⑦ Reciprocating pump suitable for conveying clean liquid or gas-liquid mixture, and some pumps such as diaphragm pump can be transported mud, sewage, etc., mainly for water supply, providing high-pressure liquid source and metering transport. Rotary pump suitable for conveying a clean liquid and liquid gas mixture, especially viscous liquid, mainly used in oil, food and liquid transport and hydraulic transmission.