Pivot actuated sleeve valve
A valve assembly has a valve body and a fluid passage through the valve body with an inlet end and an outlet end. A valve seat is defined within the fluid passage. A sleeve is axially slidable within the fluid passage and has an upstream end, a downstream end, and an axial flow passage in communication with the inlet end and the outlet end of the fluid passage. A valve stem is pivotally mounted at a stem pivot spaced radially from the fluid passage. The valve stem is actuable to slide the sleeve between an open position with the downstream end spaced from the valve seat and a closed position with the downstream end borne against the valve seat to selectively control fluid flow through the flow passage to the outlet end.
1. A sleeve valve assembly comprising:
a valve body;
a fluid passage through the valve body having an inlet end and an outlet end;
a valve seat defined within the fluid passage;
a stem housing extending radially from the valve body;
a sleeve axially slidable within the fluid passage and having an upstream end, a downstream end, and an axial flow passage in communication with the inlet end and the outlet end of the fluid passage;
a stem pivot housed within the stem housing;
a valve stem pivotally mounted at the stem pivot and partly extending through the stem housing, the valve stem being actuable to slide the sleeve between an open position with the downstream end spaced from the valve seat and a closed position with the downstream end borne against the valve seat to selectively control fluid flow through the flow passage to the outlet end; and
a convoluted boot sealed tightly to the valve stem and captured by a part of the stem housing at the stem pivot.
2. A valve assembly according to claim 1 , wherein one end of the valve stem is coupled to the sleeve at a joint and wherein the stem pivot accommodates relative axial movement of the valve stem as the sleeve slides within the fluid passage.
3. A valve assembly according to claim 1 , wherein the valve stem has a lower stem section coupled to the sleeve at a joint that accommodates relative movement between the joint and the stem pivot in an axial direction relative to the valve stem as the sleeve slides within the fluid passage.
4. A valve assembly according to claim 1 , wherein the stem pivot is defined at a pivot end of the stem housing spaced from the fluid passage.
5. A sleeve valve assembly according to claim 1 , wherein the stem pivot further comprises:
a cap removably received over the pivot end of the stem housing and capturing a part of the convoluted boot between the cap and part of the stem housing.
6. A sleeve valve assembly according to claim 5 , wherein the stem pivot further comprises:
a fluid tight seal captured within the cap and stem housing.
7. A sleeve valve assembly according to claim 6 , wherein the fluid tight seal is one of an O-ring and a packing.
8. A sleeve valve assembly according to claim 5 , wherein the stem pivot further comprises:
at least one bearing captured within the bearing region and borne against a part of the valve stem.