Abstract:
In a novel hydrant, the operation of the hydrant valve (5,6) is based on lifting the valve plug (5) vertically from the seat (6) then tilting the plug (5) away from the inlet to provide an uninterrupted bore (9). A stem (shaft) (4a) is threaded with a mating stem nut (4b) shaped to include provision for a slider (8) and a receiver (11) for a plug axle. The plug axle has an axis A-A' which is offset so as not to bisect with the axis of the stem (4a). The stem nut (4b) is of sufficient length so as to minimize the bending loads on the thread (not shown) when the plug (5) is loaded during closure of the valve (5,6). During operation of the hydrant (1) the stem (4a) is rotated by means of an external handle (4) at its upper end and consequently the stem nut (4b) and plug (5) rise vertically for a nominated distance. Thereafter, further rise of the nut (4b) and plug (5) cause the slider mechanism (8) to rotate the nut and plug (5) off the center of the bore (9) and simultaneously, as the plug (5) contacts with the walls of the hydrant (7), to rotate the plug (5) around its axle (12) so as to leave the plug (5) in a plane orthogonal to the plane in which it sat on the seat (6). During closure of the valve (5,6) the actions occur in reverse.
Abstract:
A reduced component wear valve (10) is comprised of a valve body (12) having a passage therethrough and a disc (14) attached to a rotatable shaft (38). The disc is utilized with a seal (18) forming a gap between the disc and the seal proximate to the rotational axis (16) of the disc. When the disc is in the open position, the seal major axis is greater then the disc diameter and they do not touch. As the disc rotates to near closure, the disc perimeter engages the minor axis of the seal (which is smaller than the disc diameter), and the disc stretches the seal in the minor axis direction thus decreasing the major axis such that the gap is closed. The seal can be pre-formed in an elliptical shape or it can be formed into an elliptical shape by a retaining mechanism. The seal may be a single-piece or a multi-piece assembly press-fit into the valve body. Zero or light disc to seal contact during the majority of the valve disc rotation minimizes valve seal wear and rotational friction.
Abstract:
A butterfly valve (100) for use in an exhaust brake of a vehicle has a butterfly (114) which in the fully open condition is not perpendicular to the direction of flow, but lies at a small oblique angle. The butterfly lies within the envelope of the spindle portion so as not to occlude flow area, and may be shaped to reduce flow friction and boundary layer turbulence.
Abstract:
Shut-down valve intended of use in a subwater/subliquid position, for instance in subsea pipelines for liquid/gas. It is an object to prevent the medium surrounding the valve, to penetrate the pipesystem which is being served by the valve, and at the same time counteract the through-flowing fluid to be released into the surrounding medium when the valve is to undergo maintenance. The valve comprises a valve housing comprising a cylindrical valve chamber (12, 13), which is intended for being orientated along the direcction of flow F of the liquid/gas, and a radially arranged valve chamber (14), which is closable with a removable bonnet (9), and also a clack-valve body (3) which is movable between a closed position and an open position. The shut-down valve is characterized by a clack-valve body (3) pivotally mounted to the bonnet (9) and the valve is provided with a trunk piston (7) which is axially displaceable in the cylindrical valve chamber (12, 13) of the valve housing between an advanced position where it extends over the radial valve chamber (14) of the valve housing and in this way is separating if from the cylindrical valve chamber (12, 13), in such a way that maintenance may occur without the surrounding medium coming into contact with the through-flowing fluid and a retracted position in which the trunk piston is retracted from the area of the radial valve chamber (14).
Abstract:
A closure element with a pipe housing which can be incorporated in a pipeline and a butterfly flap, for which are provided a drive shaft passing through the housing and a seating in the housing whereby, arranged on the drive shaft (10), is an annular disc (4) with loose bearings (9), and the valve flap (3) is guided in the annular disc (4), and is linked with the drive shaft by a gear unit (22, 23) which is restricted when the valve flap (3) pivots, and serves to apply the valve flap (3) against its seating (32). The closure element is characterized by the fact that the gear unit (22, 23) raises the valve flap (3) axially from the seating (32) when the drive shaft (10) turns back, until the flap is supported on the annular disc (4), and by the fact that the gear unit (22, 23) forms the connection between the valve flap (3) and the drive shaft, whereby the valve flap (3) bears on the annular disc (4).
Abstract:
An actuator assembly (600) for use with a shut-off valve in a transport or storage system. The assembly is configured to be operatively coupled to a stem of the valve for controlling fluid flow there through. The assembly includes a mounting bracket (620) coupled to the bonnet (608), a mounting sleeve (616) coupled to the stem and movable relative to the mounting bracket, and an actuator (612) having a body and an inlet formed in the body (622). The body is defined by a first body portion (623A) coupled to the mounting bracket and a second body portion (623B) coupled to the mounting sleeve and movable relative to the first body portion to expand or contract the body. The inlet is adapted to receive pressurized fluid; the body expands or contracts responsive to the pressurized fluid, and responsive to the expansion or contraction of the body, the mounting sleeve moves relative to the mounting bracket, thereby moving the stem.