Abstract:
There is disclosed a butterfly valve having a body connectable in a flowline and a seat which lines its inner side, and a disc which has stem portions at its opposite ends closely received within openings in the seat and body to permit the disc to be rotated between opened and closed positions. A ring which is restrained from movement with one of the disc and seat in a direction transverse to the stem portions substantially fills a groove in the other of the disc and seat which surrounds each stem portions so as to seal between the seat, disc and such stem portion.
Abstract:
A butterfly valve of the present invention comprises holes formed in the side wall of a housing having a fluid passage, bushings pressed into the holes, a shaft of valve body inserted into the bushings to rotatably support the valve body, a step surface facing the upper stream which is formed at a substantially semi-circular portion on the peripheral wall of the fluid passage, and a step surface facing the lower stream which is formed at another substantially semi-circular portion thereon, the peripheral end surfaces of the valve disc being brought into contact with the step surfaces, wherein the shaft is arranged by being offset to the downstream side with respect to the valve disc.
Abstract:
Rotatable valve assembly includes a mounting mechanism for rotatably mounting the valve in a housing, the mounting mechanism including a shaft having an outside end extending through the housing. A conversion mechanism converts fluid pressure in the housing into torque exerted on the shaft. A release mechanism is located outside the housing for preventing rotation of the shaft and valve when the torque exerted on the shaft is below a selected magnitude. The release mechanism allows the shaft to rotate when the torque exerted on the shaft exceeds a selected magnitude. A seal is provided for sealing the gap between the housing and the valve in the closed position. The seal has a first portion secured to the housing on a first side of the rotational axis of the valve, a second portion secured to the valve on a second side of the rotational axis, a first transitional portion coinciding with the rotational axis, and a second transitional portion coinciding with the rotational axis. The seal is unsecured to the valve or the housing and the transitional portions so that the seal may flex in the transitional portions as the valve rotates between the closed position and the open position. The first and second portions of the seal define a seal plane in the closed position of the valve and the second portion of the seal moves out of the seal plane with the valve when the valve is moved out of the closed position.
Abstract:
A pipeline valve is provided which includes a valve body having a spherical bore with a cylindrical valve seat. The cylindrical valve seat is positioned along the centerline of the spherical valve body and can be machined in the valve body. Alternatively, the valve seat can be an elastomeric material which is inserted into the valve body. The butterfly valve disk is conical in shape. In one embodiment, the disk is constructed from two halves, fastened together, having a movable T-seal perimetrial surface.The T-seal is received by a groove recessed within the disk. Behind the T-seal, an elastomer or linear expander biasing member can be disposed to force the T-seal in a direction towards the valve seat. The valve disk is connected to a control shaft by a attachment assembly which allows for self-alignment of the disk. The control shaft terminates in a forked end having two legs which define an aperture corresponding to coupling pads on either side of the disk. The disk includes a tongue disposed across the top of the disk. The control shaft has a corresponding groove adapted to receive the tongue on the disk. Surrounding the shaft is a stuffing box containing packing rings. The packing rings prevent the pressure medium from escaping between the shaft and the valve body to atmosphere. The shaft has grooves therein which receive the packing rings. The packing rings are forced into the grooves, thereby effectively sealing the valve body.
Abstract:
A fluid seal for rotary valves wherein a metal seal ring is adapted to fit within a groove formed within the valve body and a retainer ring for sealing engagement with the sealing surface of a closure member. The metal seal ring has a non-symmetrical cross section with the retainer ring side portion including a shoulder engaging the retainer within the groove and a seating portion extending from the groove for sealing engagement with the closure member. A valve body side portion of the metal seal ring includes a shoulder engaging the valve body within the groove and a non-seating portion extending from the groove for a substantially non-sealing and non-engagement with the sealing surface of the closure member. Engagement of the closure member with the seating portion of the retainer side portion of the metal seal ring torsionally loads the cross-section of the seal ring so as to only enlarge the retainer side portion. A resilient material seal ring can be added to the metal seal ring for desired applications. If the resilient material ring is destroyed by high temperatures or fire, the seating portion of the metal seal ring continues to reliably engage the closure member. An elastomeric O-ring can be used on the metal seal ring on a side opposite to the resilient material ring.
Abstract:
A method for manufacturing an improved air damper for a motor vehicle temperature control unit includes a first machining process for injection-molding a sealing section to be formed into a hollow shape. One end of the sealing section is simultaneously injected onto a lower surface of a base member. In a second machining process, the other end of the sealing section is slip-fitted onto the upper surface of the base member and mechanically affixed thereto. To this end, the sealing section preferably has openings which may be positioned over corresponding fixing pins extending from the upper surface of the base member. The fixing pins may then be folded down, for example, by heat welding to lock the fixing pins over the sealing section and thereby form a hollow member. The sealing section further includes a sealing lug for abutting a housing portion of the temperature control unit, such as an interior wall of an air duct.
Abstract:
The valve shaft passes through a journal bearing in the wall of the valve body to an actuating lever attached to the shaft on the outside of the valve body. This journal bearing is sealed by an arrangement of several parts to prevent escape of exhaust gases. These parts include a bellows and ceramic thrust washers. By making the valve shaft axis non-perpendicularly intersecting the axis of the valve body wall, the entire circumference of the valve blade can be sealed to the valve body wall when the valve is closed.
Abstract:
An air seal valve comprises an annular valve body having a circular valve plate disposed internally thereof with a pair of axially spaced valves thereon defining a fresh air plenum, one of said valves comprising a truncated conical plate having a radially outer edge engageable with the valve body to effect a seal thereagainst.
Abstract:
An improved rotary valve is provided with a bellows surrounding a bent shaft to create a hermetic seal and thereby prevent fluid loss from the interior of the valve body. The shaft is provided within a seal assembly housing, and has a lower end axis offset from the valve stem axis, and an upper end axis offset from the lower end axis. The bellows is fixedly secured at its upper end to the seal assembly housing and at its lower end to an end cap to prevent fluid within the cavity from passing out the seal assembly housing. An epicyclic gearing assembly is provided within the cavity and mechanically interconnects the lower end of the shaft to the valve stem. An actuator may be provided for connection with the upper end of the shaft for rotating the shaft. The activating device of the present invention may be used for rotating various members mounted within an enclosure with sealing the enclosure from the environment. The apparatus of the present invention has significant advantage in that it combines a hermetically sealed valve with a valve that requires low torque output for the valve operator.
Abstract:
A method for facilitating control of a butterfly valve, butterfly valves (40, 180) adapted for use with the method, and a fluid system (242) incorporating such valves are disclosed. All three use or incorporate butterfly valve structure that provides for relative translational movement (246) between the valve plate (42, 182, 248) and a pivot axis (232) in order to alter fluid dynamic torque exerted on the valve plate.