Fluid-sampling valve for a hydraulic system
AssigneeTransamerica DeLaval Inc.
InventorWilliam P. Milish
Life of this patent
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Abstract
For the purpose of safely sampling fluid from a high pressure hydraulic system there is provided a valve assembly in which the passage of fluid through a fluid flow passage in a valve housing is controlled by a pressure regulated flow velocity limiting valve followed by an external lever controlled passage occluding poppet valve. The flow passage feeds a needle nosed nozzle with all passages sized to limit the discharge flow velocity to a safe maximum. A pressure relief valve is provided to divert fluid to a safe discharge if nozzle flow should become impeded and pressure should build up above a predetermined level.
Claims17
A valve assembly for use in sampling fluids from high pressure hydraulic systems, said assembly comprising in combination a housing, a fluid flow passage through said housing from an inlet port to an outlet port, a nozzle coupled to said outlet port, means for selectably starting and stopping the flow of fluid through said flow passage, means for limiting the flow velocity of said flow of fluid substantially independent of input fluid pressure, and means including positive-pressure-responsive valve means for diverting fluid from said outlet port to a vent port if fluid pressure at said outlet port exceeds ambient pressure by a predetermined amount.
A valve assembly for use in sampling fluids from high pressure hydraulic systems, said assembly comprising in combination a housing, a fluid flow passage through said housing from an inlet port to an outlet port, a nozzle coupled to said outlet port, means for selectably starting and stopping the flow of fluid through said flow passage, means for limiting the flow velocity of said flow of fluid substantially independent of input fluid pressure, means including positive-pressure-responsive valve means for diverting fluid from said outlet port to a vent port if fluid pressure at said outlet port exceeds ambient pressure by a predetermined amount, said vent port opening into a cavity formed within the end of said housing surrounding said outlet port, said cavity being bounded by a skirt extending in the direction of said nozzle, and openings in said skirt for the discharge of fluid passed by said relief valve when said housing is pressed against a membrane which would otherwise seal off said cavity.
Dependencies are inferred from the claim text.