The suction valve and the discharge valve placed at the inlet port and outlet port of the cylinder in a reciprocating compressor or a piston-type compressor are important elements. They make gas flow in one-way into and out of the cylinder, so they have the greatest influence on the operating performance of machines, i.e., on the mechanical efficiency and reliability. In particular, the failure of a single valve in a multi-valve cylinder does not result in a significant difference in the temperature of the cylinder, but leads to the reduction in the discharge flow rate and the efficiency.
The valve is a component with the greatest impact on the efficiency, discharge rate and reliability of a reciprocating compressor and, according to the statistics, about 60% of the failure of reciprocating compressors is caused by valve failure. Therefore, the study on fault diagnosis of pneumatic valves is of great practical significance.
Among the valves of a reciprocating compressor, the suction valve is a very important working component. Generally, in order to analyze diagnosis of the leakage failure of a suction valve and investigate the valve leakage failure characteristics of compressors, simulations on the leakage failure of suction valves are conducted, and field observations on the compressors at different situations of fault operation and normal operation are performed using thermal energy parameters, indicator diagram and vibration method.
Ri Tong Ju, a researcher at the Faculty of Mechanical Science and Technology, has analyzed the effect of valve cracking pressure on the discharge flow rate of a reciprocating multistage large compressor. He used AMESim for the analysis of its operating characteristics.
He has confirmed that the stiffness of the first stage valve alone has a significant effect on the discharge flow rate of the reciprocating large compressor.
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