The influence of sand & dust and lowpressure on dynamics of piston ring was studied.
研究了西部低气压及沙尘环境对于活塞环动力学的影响。
2
As the piston travels in one direction, through a one way valve, it draws in the refrigerant gas from the lowpressure side of the circuit.
活塞向一个方向移动时，环路中低压端的气态制冷剂通过一个单向阀，循环中低压端的气态制冷剂被吸入进来。
3
And, the lagging technology leads to the disadvantages such as poor pressure stability, slow response, high noise, short life and low reliability of piston pumps.