ScholarWorks@경상국립대학교

초록

Pilot check valves were developed for use in crawler cranes, and the cracking pressure, which is a performancecharacteristic, was evaluated. A pilot check valve is a type of check valve that passes hydraulic oil in one directionand shuts it off in the reverse direction. The valve opens the poppet under the action of pilot pressure and passeshydraulic oil in the reverse direction. The main parts of the pilot check valve were a valve body, spool, retainer,poppet, seat, and spring. The verification of parts, the assembly, and the operating pressure were tested to evaluatethe cracking pressure of the pilot check valve. The pressure acting on the pilot check valve increases the supplypressure according to the conditions of the spool and poppet so that it can be understood intuitively as well asthrough test results. The results of the optimized cracking pressure and working pressure were confirmed throughpressure, oil leak, and operational tests. The effectiveness of the prototype was verified by confirming that thecracking pressure was 0.6 ± 0.05 MPa. The results of this study can be used as a basis for designing pilot checkvalves and evaluating the cracking pressures of various pilot check valves.

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