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US 8,128,062 B2Granted
Valve with self-aligning shaft seal
AssigneeParker-Hannifin Corporation
InventorsAnton Maes, Brian M. DeBlauw
Life of this patent
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Abstract
A valve design that enables a positive shaft seal to be obtained in an inexpensive manner by reducing the need for close tolerances heretofore required in prior art designs. This unique valve design employs a shaft seal that is adapted for transverse and/or angular movement during assembly of the valve for aligning to the shaft at an alignment position in which it is held after assembly of the valve by a holding device such as a seal nut or spring.
Claims18
A valve comprising:
- a spool movable within a valve body;
- a shaft associated with the spool and extending out of the valve body;
- an adapter having a through hole for receiving the shaft;
- a shaft seal for sealing against the shaft, wherein the shaft seal is adapted for transverse movement during assembly of the valve for aligning to the shaft at an alignment position and then is held in such alignment position after assembly of the valve;
- and
- a seal carrier for supporting the shaft seal, the seal carrier being transversely movable relative to the valve body within a space having a transverse dimension greater than an outer transverse dimension of the seal carrier to allow for such transverse movement of the seal carrier during assembly of the valve and becoming fixed relative to the valve body upon completion of assembly;
- wherein the seal carrier has a first recess for retaining the shaft seal, and a carrier seal in a second recess is located radially outwardly of the shaft seal for sealing to the adapter.
4 more elements
Dependencies are inferred from the claim text.