Abstract: An apparatus for locking the position of the rotary valve, wherein the valve has a valve shaft adapted to have first and second opposed flatted formations. The apparatus includes first and second cam followers. The cam followers are reciprocally movable via the action of a cam assembly comprising first and second cams mounted on a rotatable cam stem. The cam followers can be simultaneously moved in opposite directions whereby engagement walls in the first and second cam followers can engage the first and second opposed flatted formations simultaneously.

Abstract: An apparatus for locking the position of the rotary valve, wherein the valve has a valve shaft adapted to have first and second opposed flatted formations. The apparatus includes first and second cam followers. The cam followers are reciprocally movable via the action of a cam assembly comprising first and second cams mounted on a rotatable cam stem. The cam followers can be simultaneously moved in opposite directions whereby engagement walls in the first and second cam followers can engage the first and second opposed flatted formations simultaneously.

Abstract: An actuator assembly which has a primary force module having a compression spring can be is compressed by a first fluid pressure-operated piston reciprocally mounted in the primary force module. There is a tandem piston module connected to the primary force module which has a second fluid-activated piston. When the spring of the primary force module is compressed, indicating that an attached valve is in the open position, the tandem module is actuated to apply a counter balancing force against the primary piston which allows the spring to expand and move the primary piston to a position which is sufficient to permit movement of the valve element of the actuated valve to indicate the valve is not stuck in an open position.

Abstract: A system for determining the operability of a valve in active service which provides a user with real time information pertaining to the Safety Margin, the valve torque or thrust, and the percentage of valve MAST that is required for operation. The system employs a combination of an actuator package comprised of a primary actuator, a tandem force module, and a controller operatively connected to the output shaft of the primary actuator, the controller including a processor for calculating the above-described values and providing an output which can be visually, audibly, or electronically observed.

Abstract: A modular actuator assembly which can be used for partial stroke testing of a valve, the assembly having a force module and a tandem piston module. The force module has a primary piston and piston rod interconnected to a shaft which is movably mounted therein. The tandem piston module is connected to the force module and has a tandem piston and piston rod. An indicator plate is connected to the piston rod and is selectively positionable on the tandem piston rod. The tandem piston rod extends into the force module and acts as a pneumatically engaged hard stop for preventing spurious travel of the primary piston and hence spurious valve travel.

Abstract: A system for determining the operability of a valve in active service which provides a user with real time information pertaining to the Safety Margin, the valve torque or thrust, and the percentage of valve MAST that is required for operation. The system employs a combination of an actuator package comprised of a primary actuator, a tandem force module, and a controller operatively connected to the output shaft of the primary actuator, the controller including a processor for calculating the above-described values and providing an output which can be visually, audibly, or electronically observed.

Abstract: A modular actuator assembly which can be used for partial stroke testing of a valve, the assembly having a force module and a tandem piston module. The force module has a primary piston and piston rod interconnected to a shaft which is movably mounted therein. The tandem piston module is connected to the force module and has a tandem piston and piston rod. An indicator plate is connected to the piston rod and is selectively positionable on the tandem piston rod. The tandem piston rod extends into the force module and acts as a pneumatically engaged hard stop for preventing spurious travel of the primary piston and hence spurious valve travel.

Abstract: A double offset butterfly valve comprising a valve body, a valve seat carried by the valve body, and a valve disc mounted on a shaft rotatably journaled in the valve body, the shaft being eccentric both to the centerline of the body and to the centerline of the valve disc (double offset). The periphery of the valve disc has a substantial knife edge which contacts the valve seat without rubbing. As the valve disc rotates, the knife edge remains out of contact with the valve seat until the knife edge contacts the seat at full closure.

Abstract: A Scotch yoke actuator is disclosed with a dual yoke and a diagonally symmetric design. A pair of shafts and pushing devices apply equal, opposing forces to the yoke, causing end loading forces applied to a rotatable shaft attached to the center of the yoke to be cancelled. In embodiments, the weight of the pushing devices is balanced about the yoke, each shaft extends in only one direction from the yoke, and/or the shafts are supported only by the yoke and the pushing devices. In embodiments that use yoke pins, the yoke pins include rollers or bearings to reduce friction, and/or two pair of yoke pin slots support protruding ends of the yoke pins. The yoke pin slots can extend to edges of a yoke housing face, allowing easy shaft removal and reinstallation, and each shaft can include a split end with extensions on opposing sides of the yoke.

Abstract: A Scotch yoke actuator is disclosed with a dual yoke and a diagonally symmetric design. A pair of shafts and pushing devices apply equal, opposing forces to the yoke, causing end loading forces applied to a rotatable shaft attached to the center of the yoke to be cancelled. In embodiments, the weight of the pushing devices is balanced about the yoke, each shaft extends in only one direction from the yoke, and/or the shafts are supported only by the yoke and the pushing devices. In embodiments that use yoke pins, the yoke pins include rollers or bearings to reduce friction, and/or two pair of yoke pin slots support protruding ends of the yoke pins. The yoke pin slots can extend to edges of a yoke housing face, allowing easy shaft removal and reinstallation, and each shaft can include a split end with extensions on opposing sides of the yoke.

Abstract: A method for adjusting sealing engagement of a valve seat includes providing a valve with a disk in a flow passageway and a valve seal with a seat positioned for sealing engagement with the disk, the valve body and seal together defining a channel having a seal surface lubricated to resist adhesion of the surface and polymeric material, the valve body defining a passage for external access to the channel; injecting liquid polymeric material through the passage into the channel, the polymeric material in the channel pressuring the valve seat toward sealing engagement with the disk; allowing the polymeric material to harden; producing a tunnel through the hardened polymeric material from an external port to the lubricated surface of the seal; and injecting liquid polymeric material under pressure through the tunnel into the channel and causing the liquid polymeric material to flow along the lubricated surface of the seal to collect in selected regions to improve sealing engagement of the seat with the disk.

Abstract: A pneumatic actuator including a first housing having a first cylinder formed therein, a first piston slidably positioned within the cylinder of the first housing, a first rack connected to the first piston and extending therefrom, a second housing having a second cylinder formed therein, a second piston slidably positioned within the second cylinder of the second housing, a second rack connected to the second piston and extending therefrom, and a pinion engaging the first and second rack and rotatable relative to a movement of the first and second racks. The first piston has a center axis aligned with a point of contact between the first rack and the pinion. The second piston has a center axis aligned with a point of contact between the second rack and the pinion. Each rack is supported against the pinion by a pin supported by support members arranged transverse to the axis of the pinion.

Abstract: A valve actuator with an arcuate piston disposed within a housing including a side wall having a partition and two end plates whereby when joined, the housing forms a first and a second compartment. An arcuate piston travels between the compartments via an opening in the partition in an oscillating manner. A removable piston assembly enables removing the arcuate piston, output shaft and lever arms supporting the piston in order to remove the output shaft or to engage a spiral spring connecting the output shaft with the housing. The spiral spring may be pretensioned by winding before inserting the piston assembly into the housing. Fluid pressure applied to either compartment urges movement of the arcuate piston into the opposite compartment.

Abstract: A sealing assembly, usable with a valve or the like, having a movable shaft within a main housing and controlling a product under a first pressure. A cartridge housing forms a continuation of the main housing. An extension of the shaft extends through the cartridge housing and forms an annulus therewith. Spaced first and second annular seals movably seal the annulus between the shaft extension and the cartridge housing, forming a central sealing chamber. An injector introduces sealing medium into the central sealing chamber under a pressure higher than the product pressure. An accumulator receives excess sealing medium from the central sealing chamber, and can also be associated with monitoring means. Additional annular seals may form additional chambers spaced along the shaft, and these chambers may likewise be used for injection of sealing media and/or monitoring and/or leak detection.

Abstract: A valve stem-valve element assembly wherein a valve element is provided with a valve stem bore, a valve stem being received in the valve stem bore, there being a bore transverse to the valve stem bore in the valve element which is in register with the hole in the valve stem, a threaded bolt being received in the bore through the threaded hole threadedly engaging the threaded hole, the threaded portion of the bolt also frictionally engaging the smooth walls of the transverse bore.

Abstract: A positioning assembly for a rotatable valve having a valve body, a rotatable valve element and a valve stem rotatable with the valve element, the assembly including a handle with an engagement portion for engaging the valve stem and a positioning or indexing member carried by the valve body, positioning of the valve element being accomplished by flexure of the handle and selective engagement or disengagement with the positioning or indexing member.

Abstract: A seat ring for a rotary valve assembly comprising a radially inner seal section for sealing engagement with a valve element, a radially outer retaining section for mounting the seat ring in a valve body, and an intermediate spacer section interconnecting the sealing and retaining sections. The spacer section has a convoluted radial run, and the sealing section has a multiplicity of circumferential windings of strands in surrounding relation thereto.

Abstract: A wafer-type valve for securing between two flange fittings comprises a valve body having a flowway therethrough, connection formations integrally adjoining the valve body and extending radially therefrom, a valve element mounted in the flowway, and adapter means adjoining the valve body and extending outwardly therefrom. First longitudinally extending connectors cooperate between the connection formations of the valve body and the adapters to connect the adapters to the valve body, while second longitudinally extending connectors cooperate between the adapters and the flanges of the flange fittings to connect the adapters to the flange fittings. The valve also includes a seat lining its flowway and a seat retainer axially abutting the seat and one end of the valve body. The adapter overlaps the seat retainer so as to mount it to the valve body.

Abstract: A butterfly valve assembly to be installed between pipeline flanges and secured by flange bolts is disclosed. A cylindrical valve body ring, having a cylindrical bore and a face portion at each end, has a resilient elastomer lining which covers the bore and extends over a portion of the faces. A disk is attached to a shaft which extends through the body ring and liner transverse to the axis of the body ring. The valve assembly has at least one face plate with an opening which circumscribes the portion of the liner extending over the face of the body ring.

Abstract: A wafer-type valve for securing between two flange fittings comprises a valve body having a flowway therethrough, connection formations integrally adjoining the valve body and extending radially therefrom, a valve element mounted in the flowway, and adapter means adjoining the valve body and extending outwardly therefrom. First longitudinally extending connectors cooperate between the connection formations of the valve body and the adapters to connect the adapters to the valve body, while second longitudinally extending connectors cooperate between the adapters and the flanges of the flange fittings to connect the adapters to the flange fittings. The valve also includes a seat lining its flowway and a seat retainer axially abutting the seat and one end of the valve body. The adapter overlaps the seat retainer so as to mount it to the valve body.