Abstract: A pilot operated flow regulating valve has pressure governing chamber receiving a moveable pressure receiving member for common movements together with a main valve member of the pilot operated flow regulating valve in relation to a fixed valve seat and by a differential pressure exerted to the pressure receiving member from both surface sides, further has a leak route of small cross-section extending between the pressure governing chamber and either the upstream or the downstream side of the valve seat, and has a constant differential pressure control valve for selectively either controlling the pressure inside the pressure governing chamber or for blocking a pilot route extending between the upstream and downstream sides.

Abstract: A valve actuator apparatus and method comprises an operator housing secured to a bonnet assembly. The bonnet assembly is secured to the valve body, and includes a bonnet stem movably within a bonnet housing for moving a gate within the valve body to open and close the valve. A downstop member is fixably secured to the bonnet stem and engages removable stem spacers which are added or removed to obtain a selected bonnet stem drift setting. The operator housing connects to a base ring that surrounds the bonnet housing and rotates to allow positioning of a fluid port in the operator housing. The operator housing may removed and replaced without altering the bonnet stem drift adjustment. A top shaft extends from the operator housing and rotates with respect to the bonnet stem to prevent torque transmission from the top shaft to the bonnet stem. A replaceable sealing cartridge sealingly supports the top shaft for axial movement within the operator housing.

Abstract: A control valve for a variable displacement compressor is provided. A retainer cylinder in the control valve includes a first cylindrical member made of non-magnetic material and a second cylindrical member having a bottom portion made of magnetic material. A shim is intervened a bottom surface of a plunger and inner bottom surface of the second cylindrical member. The retainer cylinder has good magnetic permeability between a coil and the plunger, even though the wall of the cylinder thickens to improve the withstanding pressure to internal refrigerant pressure.

Abstract: The invention relates to a valve incorporating a flexible diaphragm, and improves upon known diaphragm valves to permit the use of a diaphragm-controlled valve in systems for which such valves were not previously suitable or utilized. There is provided a valve which includes a housing (2, 3, 34) having a hollow interior within an outer housing surface (31), a diaphragm (1a, 1b) extending across the interior and creating a diaphragm control chamber (10) within the interior, a valve seat (4) against which a part (1a) of the diaphragm can seal, a first conduit (5) leading around at least part of the valve seat, a second conduit (6) leading to within the valve seat, and a diaphragm control means (8, 9, 91, 92, 101, 111, 112), wherein the diaphragm control chamber is isolated from the first and second conduits. A valve unit and a lower control system are also disclosed, utilizing one or more valves as herein described.

Abstract: By depressing a push button (13), a user deforms a flexible diaphragm (30) and thereby causes an incompressible fluid to flow from a first actuation-chamber segment (42) through openings (48) in a divider wall (46) and into a second chamber segment (44). That flow deforms a second flexible diaphragm (40), which accordingly causes an actuator shaft (58) to break the seal formed by an O-ring (57) and thereby permit flow from a main valve inlet (11) through a main valve outlet (12). When the user releases the push button (13), an actuator check valve (50) prevents the incompressible fluid from returning through the divider-wall openings (48) to the first chamber segment (42). The actuator therefore returns only slowly, through a bleed orifice (72). A pressurizer conduit (86) communicates the valve's outlet pressure to a stop chamber (82) and thereby causes the position of a stop member (76) to be dependent on that pressure.

Abstract: An actuator for controlling the pressure of fluid, such as water or steam, from a fluid source to a flow controlling orifice. The actuator can be used to apply such fluids to the web of a papermaking machine. The actuator comprises a housing having a first inlet connectable to the fluid source and a second inlet connectable to a pressure source. A resilient bellows structure extends between the first and second inlets within the housing to define an internal region of the bellows structure in sealed communication with one of the first and second inlets and an external region of the bellows structure in sealed communication with the other inlet. The bellows structure expands or contracts within the housing depending on the difference in pressures between the internal and external regions of the bellows.

Abstract: Disclosed is a pneumatic actuator which includes a housing comprised of two halves and having at least two passages defined therethrough, including a “loop” groove defined in an inner peripheral wall of the housing into which a seal member is inserted. A rotary piston is rotatably received in the housing. The piston has a top and a bottom with an intermediate wall connected there between, and an actuating shaft extending through the housing, which is rotated by movement of the rotary piston. The seal member extends into the housing and is in contact with the top and bottom of the rotary piston all the times. The rotary piston moves free of contact with the interior surface of the housing and this one seal member provides a seal for the joint created between the halves of the housing, the chambers of the housing as well as the actuating shaft. Movement of the piston is effected by air pressure and return motion of the piston can be air driven or spring assisted.

Abstract: A valve actuator apparatus and method comprises an operator housing secured to a bonnet assembly. The bonnet assembly is secured to the valve body, and includes a bonnet stem movably within a bonnet housing for moving a gate within the valve body to open and close the valve. A downstop member is fixably secured to the bonnet stem and engages removable stem spacers which are added or removed to obtain a selected bonnet stem drift setting. The operator housing connects to a base ring that surrounds the bonnet housing and rotates to allow positioning of a fluid port in the operator housing. The operator housing may removed and replaced without altering the bonnet stem drift adjustment. A top shaft extends from the operator housing and rotates with respect to the bonnet stem to prevent torque transmission from the top shaft to the bonnet stem. A replaceable sealing cartridge sealingly supports the top shaft for axial movement within the operator housing.