Rotary valves
A rotary valve includes a valve shaft coupled to a rotary valve element. The valve shaft defines an axis and is rotatable thereabout. The valve further comprises a rotary position sensor and a coupling rotationally coupling the valve shaft and the sensor. A wrenching arm is rotationally coupled to the valve shaft, and extends radially outwardly of the axis for attachment of a wrenching tool thereto. The coupling is axially between the rotary position sensor and the wrenching arm.
1. A rotary valve comprising:
a valve shaft coupled to a rotary valve element, the valve shaft defining an axis and being rotatable thereabout;
a rotary position sensor;
a coupling rotationally coupling the valve shaft and the sensor;
a wrenching arm rotationally coupled to the valve shaft, the wrenching arm extending radially outwardly of the axis for attachment of a wrenching tool thereto, wherein the coupling is axially between the rotary position sensor and the wrenching arm;
a valve housing, the valve housing comprising a socket formed therein, wherein the shaft extends axially through the valve housing; and
a stop element for selective engagement with the socket;
wherein the socket is positioned such that the wrenching arm configured to engage the stop element to prevent rotation of the wrenching arm around the axis.
2. The rotary valve of claim 1 , wherein the wrenching arm is directly coupled to the valve shaft.
3. The rotary valve of claim 1 , wherein the wrenching arm comprises a tooling connection disposed thereon.
4. The rotary valve of claim 3 , wherein the tooling connection includes a protrusion of material or a cutaway.
5. The rotary valve of claim 1 wherein, the wrenching arm extends radially from the axis.
6. The rotary valve of claim 1 , wherein the wrenching arm comprises a first section extending generally transverse to the axis, and a second section extending generally perpendicular from the first section, the tooling connection optionally being disposed on the second section.
7. The rotary valve of claim 1 , wherein the wrenching arm is formed from a unitary piece of sheet metal.
8. The rotary valve of claim 1 , wherein the wrenching arm is keyed to the valve shaft.
9. The rotary valve of claim 1 , further comprising:
a second arm, unitarily formed with the wrenching arm and axially separated therefrom, the second arm rotationally coupled to the sensor, the wrenching arm and second arm thereby together forming the coupling between the valve shaft and the sensor.
10. The rotary valve of claim 9 , wherein the second arm is flexible.
11. The rotary valve of claim 10 , wherein the second arm comprises a flexible serpentine portion.
12. The rotary valve of claim 1 , wherein the coupling comprises:
an upper portion a lower portion axially separated by a deformable middle portion, the upper and lower portions being more rigid than the deformable middle portion, the sensor being attached to the upper portion and the wrenching arm being directly connected to the lower portion of the coupling.
13. The rotary valve of claim 12 , wherein the direct connection comprises:
a dovetail slot having a closed end and an open end for receiving the wrenching arm.
14. The rotary valve of claim 13 , wherein the coupling forms an generally annular shape around the shaft, the annular shape interrupted by a split extending axially along the coupling, the coupling comprising:
a screw cooperating with at least one threaded hole on one side of the split, and the coupling engaging with the shaft on tightening of the screw, the screw projecting over the open end of the dovetail slot to retain the wrenching arm therein.
15. The rotary valve of claim 1 , wherein the wrenching arm comprises a blocking element for engagement with the stop element.