Three-way poppet valve with internal check feature
AssigneeParker-Hannifin Corporation
InventorMichael L. Doutt
Life of this patent
Estimating the term…
Abstract
A three-way poppet valve that can restrict or eliminate backflow without the use of an external check valve. Unlike conventional three-way poppet valves wherein both inlets can be open to the outlet at the same time during movement of the poppet, the valve according to the present invention can be configured to close both inlets prior to opening one of the inlets to the outlet. The valve features a poppet valve assembly that is operable to prevent both inlets from being open to the outlet at the same time. The valve assembly also reduces the force needed to close the valve against at least one of the inlets thereby allowing the use of a smaller actuator. A unique seal including a valve seat that is configured to conform to a valve member under sufficient pressure.
Claims13
A three-way poppet valve comprising:
- a valve body;
- and
- a valve assembly movable in a chamber of the valve body for controlling communication between a high pressure passage, a low pressure passage and an outlet passage;
- wherein the valve assembly has a first valve member movable between an open and closed position to respectively permit or block flow through the high pressure passage, and a second valve member movable between an open and closed position to respectively permit or block flow through a low pressure passage;
- wherein the second valve member is moved by the first valve member to the closed position when the first valve member is moved to the open position;
- and
- wherein when the first valve member is moved to the closed position, the second valve member remains in the closed position until a pressure differential between the chamber and the low pressure inlet reaches a prescribed criteria.
Dependencies are inferred from the claim text.