Abstract:

Pressure reducing valves were often used in gas pipeline systems to control the downstream pressure. At present， the pressure reduction range of conventional small pressure reducing valves was small， and it was difficult to meet the pressure reduction demands under ultra-high pressure. A small pressure reducing valve with adjustable output pressure under ultra-high pressure was proposed， with an input pressure of 19~60 MPa and an output pressure of 7~13 MPa. By establishing a test platform and setting different upstream pressure and downstream resistance of the pressure reducing valves， the stability of the performance of the pressure reducing valves and the characteristic change were studied under four types of working conditions. Through experimental validation， the pressure reducing valve may maintain stable downstream pressure in ultra-high pressure usage scenarios. The response time of the valves after the pipeline connection is between 0.5 and 6.0 seconds， with pressure fluctuations within 10 seconds after response being between 0.12% and 4.49%. The results indicate that the trend of pressure changes after the reducing valves are related to the upstream pressure： when the upstream pressure decreases， the output pressure first declines and then rises， while when the upstream pressure is stable， the output pressure tends to decrease. The results may guide the applications of the pressure reducing valves in hydraulic systems.

Key words: high-pressure gas pressure reducing valve, nitrogen, pressure, flow rate

摘要：

气体管路系统中常使用减压阀来控制下游压力，目前常规小型减压阀的降压幅度较小，难以满足超高压下的降压需求。提出了一种超高压条件下输出压力可调的小型减压阀，其输入压力为19~60 MPa，输出压力为7~13 MPa。通过建立试验平台、设置不同的减压阀上游压力和下游阻力，研究了减压阀在四类工况下工作性能的稳定性以及特性参数的变化。经过试验验证，该减压阀可以在超高压使用场景下维持下游压力稳定，管路接通后减压阀的响应时间为0.5~6.0 s，响应后10 s内的压力波动幅度为0.12%~4.49%。结果表明：减压阀阀后压力变化趋势与上游压力有关，上游压力减小时输出压力先减小再增大，上游压力稳定时输出压力有减小的趋势。研究结果可指导该型减压阀在气体管路系统中的应用。

关键词: 高压气体减压阀, 氮气, 压力, 流量