Question

A pressure relief valve contains a poppet with a 0.65 in² area on which system pressure acts. During assembly, a spring with a constant of 2000 lbf/in is installed in the valve to hold the poppet against its seat. The adjustment mechanism is then set so that the spring initially compresses 0.15 in from its free length condition. In order to pass full pump flow through the valve at the PRV pressure setting, the poppet must move 0.10 in from its fully close position. Determine the

a. Cracking Pressure (psi)

b. Full pump flow pressure (PRV pressure setting) (psi)

Answer 1