Patent ID: 6068022
Filing Date: 2000-05-30
Classification: F02M,F04F,F16K,Y10T

Abstract:
A jet pump comprising:a pressure relief valve comprising:a valve body that comprises an inlet, a valve seat around the inlet downstream of the inlet, and an unregulated outlet downstream of the valve seat;a valve member mounted to move between a closed position, in which the valve member seals against the valve seat to block fluid flow from the inlet to the outlet, and an open position, in which the valve member permits fluid flow from the inlet to the outlet; anda spring reacting against the valve body to bias the valve member to the closed position; anda jet pump nozzle connected to the valve body to receive fluid flow from the outlet;wherein the valve seat defines a first area A1, wherein the valve member defines a second area A2, and wherein the ratio A2/A1 is selected to provide a hysteresis between opening and closing pressures as measured at the inlet of at least 6 psi.