Brand Model: Yuken YUKEN A37-FR-01-BK-32 material: cast iron, stainless steel performance: Auto Shanghai Building a Valve Co., Ltd. product range, welcome your advice YUKEN: A series variable piston A10, A16, A22, A37 , A56, A70, A90, A145, PV series, PV2 series PV2R1-17-F-RAA-41 A16-FR-01-BSK-32, PV2R2-33-F-RAA-41 Hydraulic Troubleshooting: force oil open pilot valve port, the oil flow through the valve orifice stepped down, the valve body of the relief valve discharge channel flows back into the oil chamber and the main valve port spilled oil flow convergence, the return line back into the tank together. Thus, the flow state of the relief valve return line directly affect oil flow adjustment pressure relief valve. If there are pressure shocks, back pressure flow variation directly on the pilot valve, and consistent with the pilot valve spring force direction, the control cavity in fluid pressure will increase, and with it came shocks and volatility, resulting in an overflow valve to adjust the pressure of unstable and easily evoke vibration and noise. Jiong two share a pipeline spill, the oil flow due to the interaction of two strands of the double pump work simultaneously, easy to produce pressure fluctuations, while the return port back pressure relief valve apparently Zeng large, these two factors at each other the role, will inevitably lead to system pressure instability, and vibration and noise.