8Ray A, Dynamic modelling and simulation of a relief valve [J]. Simulation, 1978,167-172.
9Watton J. The design of a single-stage relief valve with directional damping[J]. Journal of Fluid Contral Inclu-ding Fluidics Quarterly , 1988, l 8 (2) : 22-35.
10Chin C Y, Static and dynamic characteristics of a two stage pilot relief valve [J]. ASME Dynamic Systems Measurements and Controls, 1991, 113 : 180-288.
