Pressure relief valve for controlling pump

• US 3,195,556 A
• Filed: 12/26/1962
• Issued: 07/20/1965
• Est. Priority Date: 12/26/1962
• Status: Expired due to Term

• Current Assignee: Iven R. Norstrud, John H. Threlkeld
• Original Assignee: Iven R. Norstrud, John H. Threlkeld
• Inventors: Norstrud, Iven R., Threlkeld, John H.
• Application Number:
  US04/247,126
• Time in Patent Office: 937 Days
• US Class Current: 137/469
• CPC Class Codes: F16K 17/0433 with vibration preventing means
• CPC Class Codes: Y10T 137/7738 Pop valves

Claims

1. A RELIEF VALVE COMPRISING:

(A) A FLUID PRESSURE TRANSMITTING PASSAGE ADAPTED TO BE CONNECTED TO THE OUTLET OF A PUMP AT ONE END AND A DISCHARGE DEVICE AT THE OTHER END;

(B) A FLUID PRESSURE BY-PASS HAVING A FLUID PASSAGE ADAPTED TO BE CONNECTED TO THE INLET OF A PUMP AT ONE END AND HAVING A CYLINDRICALLY SHAPED CHAMBER AT THE OTHER END, THE TWO COMMUNICATING WITH EACH OTHER THROUGH AN ORIFICE OF LARGER AREA THAN THE SMALLEST CROSS-SECTIONAL AREA OF SAID FLUID PRESSURE TRANSMITTING PASSAGE TO A DISCHARGE DEVICE FOR DETERMINING THE MAGNITUDE OF A RELATIVELY LOW PRESSURE;

(C) A COMMUNICATION HAVING A SMALL APERTURE POSITIONED BETWEEN SAID FLUID PRESSURE TRANSMITTING PASSAGE AND SAID CYLINDRICALLY SHAPED CHAMBER UPSTREAM FROM SAID SMALLEST CROSS-SECTIONAL AREA, SAID COMMUNICATION FORMING THE ONLY FLUID CONNECTION BETWEEN SAID PRESSURE TRANSMITTING PASSAGE AND SAID BY-PASS;

(D) A PISTON IN FLUID SEALING RELATION WITH SAID CYLINDRICALLY SHAPED CHAMBER HAVING A CONICALLY SHAPED END COVERING SAID APERTURE AND HAVING A CONTROL ENGAGING ELEMENT FORMED AS A PART THEREOF;

(E) A CONDUIT IN FLUID COMMUNICATION WITH SAID CYLINDRICALLY SHAPED CHAMBER ABOVE SAID PISTON AND WITH SAID FLUID PRESSURE BY-PASS BETWEEN SAID ORIFICE AND AN END OF SAID BY-PASS ADAPTED TO BE CONNECTED TO THE INLET OF A PUMP SO THAT THE PRSSURE OF A SOURCE OF FLUID IS APPLIED ABOVE SAID PISTON AND TO THE FLUID PRESSURE TRANSMITTING PASSAGE COMMUNICATING WITH THE LOWER SIDE OF SAID PISTON;

(F) AND A SPRING BIASING SAID PISTON TO NORMALLY CLOSE SAID SMALL APERTURE, SAID PISTON REQUIRING A RELATIVELY HIGH PRESSURE THROUGH SAID APERTURE FOR ACTUATION AND DISPLACEMENT THEREOF BUT REQUIRING ONLY A RELATIVELY LOW PRESSURE AGAINST SAID ENTIRE END AREA TO MAINTAIN SAID DISPLACEMENT AFTER BEING ACTUATED, SAID PISTON REMAINING DISPLACED UNTIL THE PRESSURE IN SAID ORIFICE BECOMES LOWER THAN SAID LOW PRESSURE ALLOWING SAID SPRING TO AGAIN BIAS SAID PISTON TO CLOSE SAID APERTURE.