Abstract A controllable check valve, for a hydraulic system, includes a relatively elongated body having means defining a valve zone, fluid inlet means and fluid outlet means. The body is formed with a frustoconical valve seat between the inlet and outlet means. A valve member is displaceable longitudinally in the body and is formed with a frustoconical valve seating surface sealingly engageable with the valve seat. Stems extend in opposite longitudinal directions from the frustoconical valve seating surface, and slide in closely fitting bores in the valve body to serve as guides for the valve member. During longitudinal displacement of the valve member, these stems project through the valve zone through at least the length of the possible valve stroke. Packings are provided in the valve housing, spaced from the valve zone, and engage the stems which extend outside the valve zone in at least one operating position of the valve member.
Inventors
👤 Walter Hetzer
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-30 14:26
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
246 words
A controllable check valve, for a hydraulic system, comprising, in combination, a relatively elongated body having means defining a valve zone, fluid inlet means and fluid outlet means, said body being formed with a frustoconical valve seat between said inlet and outlet means; a valve member displaceable in said body and formed with a frustoconical valve seating surface sealingly engageable with said valve seat; and means operatively associated with said valve member and maintaining the volume of fluid in said valve zone constant in all operating positions of said valve member; said last named means comprising a pair of stems extending in opposite longitudinal directions from said valve seating surface and guidingly engaged in said valve body to guide said valve member; said stems extending through said valve zone, in a longitudinal direction, through at least the extent of the maximum possible valve stroke in a respective direction; said valve body being formed with a woRking zone completely separated from said valve zone; a piston movable in said working zone and engaged with one of said stems; and means for applying fluid pressure to an outer surface of said piston to move said valve member from a closed position to an open position; means biasing said valve member to the closed position; and a bore extending centrally through said valve member and through said stems and communicating, at one end, with the space beneath said piston and, at the other end, with a fluid return line.
Claim 2
Dependent Claim
246 words
A controllable check valve, for a hydraulic system, comprising, in combination, a relatively elongated body having means defining a valve zone, fluid inlet means and fluid outlet means, said body being formed with a frustoconical valve seat between said inlet and outlet means; a valve member displaceable in said body and formed with a frustoconical valve seating surface sealingly engageable with said valve seat; and means operatively associated with said valve member and maintaining the volume of fluid in said valve zone constant in all operating positions of said valve member; said last named means comprising a pair of stems extending in opposite longitudinal directions from said valve seating surface and guidingly engaged in said valve body to guide said valve member; said stems extending through said valve zone, in a longitudinal direction, through at least the extent of the maximum possible valve stroke in a respective direction; said valve body being formed with a woRking zone completely separated from said valve zone; a piston movable in said working zone and engaged with one of said stems; and means for applying fluid pressure to an outer surface of said piston to move said valve member from a closed position to an open position; means biasing said valve member to the closed position; and a bore extending centrally through said valve member and through said stems and communicating, at one end, with the space beneath said piston and, at the other end, with a fluid return line.