Fluid dispensing system incorporating a fluid accumulator

Claim 1

A FLUID METERING SYSTEM FOR DELIVERING FLUID FROM A FLUID INLET TO A PRESSURE RESPONSIVE FLUID DISPENSING DEVICE AND FOR CYCLICALLY VARYING THE FLUID PRESSURE UPON THE DISPENSING DEVICE FOR ACTUATING THE DISPENSING DEVICE, SAID SYSTEM COMPRISING FLUID ACCUMULATOR MEANS ADAPTED TO STORE A PREDETERMINED VOLUME OF FLUID UNDER PRESSURE, FLUID DISPLACEMENT MEANS FOR SEQUENTIALLY DELIVERING PREDETERMINED VOLUMES OF FLUID FROM SAID FLUID INLET TO SAID FLUID ACCUMULATOR MEANS FOR CHARGING SAID FLUID ACCUMULATOR MEANS, FLUID RETURN PASSAGE MEANS EXTENDING FROM SAID FLUID ACCUMULATOR MEANS TO SAID FLUID INLET, CHECK VALVE MEANS IN SAID FLUID RETURN PASSAGE MEANS FOR PRECLUDING FLUID FLOW FROM SAID FLUID INLET TO SAID FLUID ACCUMULATOR MEANS THROUGH SAID FLUID RETURN PASSAGE MEANS AND FOR PERMITTING FLOW FROM SAID FLUID ACCUMULATOR MEANS TO SAID FLUID INLET THROUGH THE FLUID RETURN PASSAGE MEANS, RELIEF VALVE MEANS IN SAID FLUID RETURN PASSAGE MEANS, SAID RELIEF VALVE MEANS BEING RESPONSIVE TO THE PRESSURE IN SAID FLUID ACCUMULATOR MEANS AND BEING NORMALLY CLOSED FOR PRECLUDING FLUID FLOW FROM SAID FLUID ACCUMULATOR MEANS TO SAID FLUID INLET THROUGH SAID FLUID RETURN PASSAGE MEANS UNTIL THE PRESSURE IN SAID FLUID ACCUMULATOR MEANS EXCEEDS A PREDETERMINED VALUE, AND CONDUIT MEANS FOR PROVIDING FOR FLUID COMMUNICATION BETWEEN THE OUTLET SIDE OF SAID FLUID DISPLACEMENT MEANS AND THE FLUID DISPENSING DEVICE FOR DELIVERING FLUID THERETO.