Check valve

An improved piston in a check valve which prevents unintentional leakage past the check valve even at low pressures. The piston includes a generally-conically shaped tip and a Teflon ring received in a groove circumscribing the tip. The valve includes first and second passageways with an annular, ge...

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Bibliographic Details
Main Author WISER; DAVID
Format Patent
LanguageEnglish
Published 17.02.1987
Edition4
Subjects
ACTUATING-FLOATS
BLASTING
COCKS
DEVICES FOR VENTING OR AERATING
ENGINEERING ELEMENTS AND UNITS
GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS
GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC
GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS
HEATING
LIGHTING
MECHANICAL ENGINEERING
TAPS
TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
TECHNICAL SUBJECTS COVERED BY FORMER USPC
TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
THERMAL INSULATION IN GENERAL
VALVES
WEAPONS
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Summary:An improved piston in a check valve which prevents unintentional leakage past the check valve even at low pressures. The piston includes a generally-conically shaped tip and a Teflon ring received in a groove circumscribing the tip. The valve includes first and second passageways with an annular, generally conical seat therebetween. The piston is slidably received in the second passageway such that with fluid pressure applied towards the seat, the ring abuts the seat. The proximal portion of the tip adjacent the ring is inwardly relieved such that the outermost region of the ring is unsupported. When even a low pressure is applied, the ring contacts the seat and flexs or bends towards the relieved proximal portion to provide an effective low pressure seal between the ring and seat.
Bibliography:Application Number: US19850724347