Pulsation damping device

Claim 1

A PULSATION DAMPING DEVICE COMPRISING: A PAIR OF HOLLOW END FITTINGS ARRANGED FOR CONNECTION IN A FLUID CIRCUIT; A RIGID, HOLLOW OUTER MEMBER CONNECTED AT EACH END WITH ONE SAID END FITTINGS AND HAVING AN OPENING IN THE WALL THEREOF; A RESILIENT TUBULAR MEMBER HAVING THE ENDS THEREOF SECURELY RETAINED BETWEEN SAID END FITTINGS AND OUTER MEMBER, SAID RESILIENT TUBULAR MEMBER AND HOLLOW END FITTINGS FORMING A FLOW PASSAGEWAY THROUGH SAID DEVICE AND SAID RESILIENT TUBULAR MEMBER AND OUTER MEMBER SPRING-LIKE MEMBER DISPOSED IN SAID FLOW A COILED, SPRING-LIKE MEMBER DISPOSED IN SAID FLOW PASSAGEWAY BETWEEN SAID END FITTISNGS, SAID COILED, SPRING-LIKE MEMBER BEING SPACED RADIALLY INWARDLY FROM SAID RESILIENT TUBULAR MEMBER WHEN SAID RESILIENT MEMBER IS IN ITS RELAXED, UNSTRESSED CONDITION; A CHECK VALVE MOUNTED IN SAID OPENING ARRANGED TO PERMIT THE INTRODUCTION OF FLUID INTO SAID ANNULAR CHAMBER, AND TO PREVENT THE EGRESS OF FLUID THEREFROM; AND, A PRESSURIZED, COMPRESSIBLE FLUID IN SAID TUBULAR MEMBER EXERTING A FORCE ON SAID RESILIENT TUBULAR MEMBER TENDING TO MOVE SAID TUBULAR MEMBER INTO ENGAGEMENT WITH SAID SPRING-LIKE MEMBER, WHEREBY PULSATING FLUID FLOWING THROUGH SAID PASSAGEWAY EXERTS A FORCE ON SAID TUBULAR MEMBER OPPOSING THE FORCE EXERTED BY SAID COMPRESSIBLE FLUID, THEREBY MODULATING THE AMPLITUDE OF THE PULSATIONS OF SAID FLOWING FLUID.