Valve stem actuator
AssigneeRalph A. Hiller Company
InventorsJames R. Nanci, James MacGregor
Life of this patent
Estimating the term…
Abstract
A valve stem actuator for a slurry valve or the like includes a support frame extending from the valve body to a linear operator having a cylinder and piston. Means are provided for connecting the piston rod to the valve stem and means reciprocally mounted on the support frame rotate the valve stem with respect to the valve body independently of the linear movement of the valve stem to dislodge accumulated crust to permit the valve disc to properly seat to prevent fluid flow through the valve. The linear operator is preferably pneumatically or hydraulically actuated and the rotary actuator preferably comprises an air or hydraulically actuated rack engageable with the valve stem. The valve stem actuator is useful for new valves or for retrofit of present slurry valves or the like.
Claims18
A valve stem actuator for a slurry valve or the like wherein the valve seat of the valve body is subject to encrustation of materials which inhibits proper seating of the valve disc on the valve seat and wherein the valve includes a longitudinally extending valve stem adapted for connection on the end opposite the valve disc, said actuator comprising:
- (a) a support frame adapted to extend from said body;
- (b) an operator mounted on said support frame including a cylinder having a piston with a piston rod for moving said valve stem linearly with respect to said body;
- (c) means for connecting the piston rod to the valve stem;
- (d) means mounted and linearly received on said support frame during the linear movement of said valve stem, for rotating said valve stem about its axis in either direction with respect to said valve body independently of said linear movement of said valve stem to dislodge accumulated crust to permit the valve disc to properly seat to prevent fluid flow through the valve.
A valve stem actuator for a slurry valve or the like wherein the valve seat of the valve body is subject to encrustation of materials which inhibits proper seating of the valve disc on the valve seat and wherein the valve includes a longitudinally extending valve stem adapted for connection on the end opposite the valve disc, said actuator comprising:
- (a) a plurality of posts extending from said valve body;
- (b) an operator mounted on said posts including a cylinder having a piston with a piston rod, wherein the end of said piston rod is externally threaded, for moving said valve stem linearly with respect to said body;
- (c) means for connecting the piston rod to the valve stem, wherein the connection means comprises a sleeve having a bore, one end of said bore being internally threaded for engagement with the external threads of said piston rod, a bushing in the opposite end of the bore and having internal threads for engagement with said stem, a bearing on said bushing and a cap secured to the sleeve for retaining the bushing and bearing in position to permit linear movement of the valve stem by the operator;
- (d) means mounted and linearly received on said posts during the linear movement of said valve stem for rotating said valve stem about its axis in either direction with respect to said valve body independently of said linear movement of said valve stem to dislodge accumulated crust to permit the valve disc to properly seat to prevent fluid flow through the valve.
In a slurry valve or the like having a valve body, a valve stem and a valve disc, wherein the valve seat of the valve body is subject to encrustation of materials which inhibits proper seating of the valve disc on the valve seat and wherein the valve includes a longitudinally extending valve stem adapted for connection on the end opposite the valve disc, the improvement comprising:
- (a) a support frame adapted to extend from said body;
- (b) an operator mounted on said support frame including a cylinder having a piston with a piston rod for moving said valve stem linearly with respect to said body;
- (c) means for connecting the piston rod to the valve stem;
- (d) means mounted and linearly received on said support frame during the linear movement of said valve stem for rotating said valve stem about its axis in either direction with respect to said valve body independently of said linear movement of said valve stem to dislodge accumulated crust to permit the valve disc to properly seat to prevent fluid flow through the valve.
In a slurry valve or the like having a valve body, a valve stem and a valve disc, wherein the valve seat of the valve body is subject to encrustation of materials which inhibits proper seating of the valve disc on the valve seat and wherein the valve includes a longitudinally extending valve stem adapted for connection on the end opposite the valve disc, the improvement comprising:
- (a) a plurality of posts extending from said valve body;
- (b) an operator mounted on said posts including a cylinder having a piston with a piston rod, wherein the end of said piston rod is externally threaded, for moving said valve stem linearly with respect to said body;
- (c) means for connecting the piston rod to the valve stem, wherein the connection means comprises a sleeve having a bore, one end of said bore being internally threaded for engagement with the external threads of said piston rod, a bushing in the opposite end of the bore and having internal threads for engagement with said stem, a bearing on said bushing and a cap secured to the sleeve for retaining the bushing and bearing in position to permit linear movement of the valve stem by the operator;
- (d) means mounted and linearly received on said posts during the linear movement of said valve stem, for rotating said valve stem about its axis in either direction with respect to said valve body independently of said linear movement of said valve stem to dislodge accumulated crust to permit the valve disc to properly seat to prevent fluid flow through the valve.
Dependencies are inferred from the claim text.