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US 5,205,324 AGranted
Closed center valves
AssigneePneumo Abex Corporation
InventorRobert M. Salemka
Life of this patent
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AssigneePneumo Abex Corporation
InventorRobert M. Salemka
Estimating the term…
Closed center valves include a first member movable toward and away from a vent opening in the valve for respectively closing and opening the vent opening, and a second member movable toward and away from the first member for respectively closing and opening a high pressure passage through the first member. A biasing force is applied to the first member for biasing the first member toward the vent opening. Different magnitudes of force may be applied to the second member to cause the second member to move toward the first member first to close the high pressure passage through the first member while the vent opening remains closed by the first member, and then to cause the first member to move away from the vent opening to open the vent opening while the high pressure passage in the first member remains closed by the second member. An armature will move the second member toward the first member with sufficient force to unseat the first member from the vent opening when rated current is applied to a solenoid coil surrounding the armature. A permanent magnet may be provided for moving the armature away from the second member when zero current is applied to the motor coil. Also, flat springs may be used to support the armature in coaxial alignment with the second member to prevent frictional contact between the armature and surrounding structure.
A closed center valve comprising a housing containing first opening means for venting fluid through said valve, a first member movable toward and away from said first opening means for respectively closing and opening said first opening means, means for biasing said first member toward said first opening means, second opening means through said first member for directing high pressure fluid through said valve, and a second member movable away from said first member to open said second opening means while said first opening means remains closed by said first member, said second member also being movable toward said first member to close said second opening means while said first opening means remains closed by said first member, and being further movable toward said first member to cause said first member to move away from said first opening means to open said first opening means while said second opening means remains closed by said second member.
A closed center valve comprising vent means for venting fluid through said valve, first means movable toward and away from said vent means for respectively closing and opening said vent means, means for biasing said first means toward said vent means, means for supplying high pressure fluid to said first means, and second means movable away from said first means to allow high pressure fluid to flow through said first means while said first means is biased to close said vent means, said second means also being movable toward said first means to block fluid flow through said first means while said first means is biased to close said vent means, and being further movable toward said first means to open said vent means while still blocking fluid flow through said first means.
Dependencies are inferred from the claim text.