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US 4,051,862 AGranted
Control valves
OwnerHarry M. Haytayaninventor
Life of this patent
Estimating the term…
Abstract
A simple and rugged three-way valve is provided which may be used as a trigger-operated control valve for portable pneumatic tools. The valve utilizes a valve member which is slidably disposed in a valve chamber for reciprocal movement between two valve seats and is tapered at its periphery so that it cannot obstruct a side port that is located between the valve seats.
Claims14
A control valve comprising:
- a hollow valve casing having (1) a slide bore for a slide valve unit, (2) first, second and third ports for conducting flow of fluid into and out of said casing, and (3) first and second resilient valve seats surrounding first and second openings leading to said first and second ports respectively, said valve seats being aligned with said slide bore;
- and
- a slide valve unit having a valve stem slidably disposed in said slide bore and a valve head attached to the inner end of said stem and movable by said stem into engagement alternatively with said first and second valve seats, said valve head being generally diamond shaped in longitudinal section and being sized so that said valve head forms a close sliding fit with the surrounding portion of said casing, (2) fluid pressure applied via said first port and said first opening will force said valve member away from said first valve seat toward said second valve seat, (3) when it is engaged with either said first or second valve seat it will block flow of fluid through said first or second opening respectively, and (4) at all positions along its path of travel between the two valve seats it is incapable of blocking flow of fluid into or out of the casing via said third port.
A control valve comprising:
- a hollow valve casing having (1) a slide bore for a slide valve unit, (2) first, second and third ports for conducting flow of fluid into and out of said casing, and (3) a first valve seat surrounding said first port, and a second valve seat disposed between said first port and said third port and between said second port and said third port, said valve seats being aligned with said bore;
- and
- a slide valve unit having a valve stem disposed within said slide bore and a valve head attached to the inner end of said stem and movable by said stem into engagement alternately with said first and second valve seats so long as the fluid pressure within the valve is below a predetermined level, with said second valve seat being arranged so that if the fluid pressure applied via said first port is above said predetermined level, said second valve seat will yield far enough to allow said valve member to pass by said second valve seat, said valve head being arranged so that (1) its periphery makes a close sliding fit with the surrounding portion of the casing, (2) fluid pressure applied via said first port will force said valve member away from said first valve seat toward said second valve seat, (3) when it is engaged with said first valve seat it will block the flow of fluid via the first port (4) when it is engaged with said second valve seat it will block the flow of fluid past said second valve seat, and (5) at all positions other than when said valve head is engaged with said second valve seat the valve head will be incapable of preventing the flow of fluid through the casing via said third port.
Dependencies are inferred from the claim text.