Abstract: There is provided an exhaust pressure-adjusting valve that is brought into a closed position due to a biasing force of a resilient body and is opened against the biasing force of the resilient body due to the exhaust pressure in an exhaust channel, which is raised in response to the closing of a throttle valve, in which valve-opening area is increased or decreased according to the displacement of the resilient body, to thereby adjust the exhaust pressure. The exhaust pressure-adjusting valve has a unit for changing the growth rate of the valve-opening area, which gradually heightens the growth rate of the valve-opening area with respect to the displacement of the resilient body in a valve-opening direction.

Abstract: A control system for a bypass duct includes a pneumatic damper control assembly, a sensor and a pneumatic switch. The damper control assembly includes a damper vane mountable in the bypass duct for movement between relative open and closed positions to regulate airflow through the bypass duct. The position of the damper vane is controllable via pressure applied through a damper control line. The sensor is mountable to the supply duct to transmit a pneumatic supply duct signal via a supply line based on at least one of air pressure or air velocity in the supply duct. Finally, the pneumatic switch opens or closes the connection between the damper control line and the supply line based on the difference between (1) the pneumatic supply duct signal via the supply line, and (2) the combination of the pneumatic pressure from the damper assembly and a switch biasing pressure.

Abstract: A tri valve backflow preventer having parts and materials preferably consisting of steel nuts and bolts, ductile iron operating nuts, nitrile rubber O-rings, nitrile rubber gaskets, manganese bronze valve adjusting stems, valve wedge gates made of ductile iron encapsulated with EPDM rubber, and ductile iron valve bodies. Material and parts are constructed in accordance with ASTM standards and the requirements of the AWWAC-509 and AWWAC-504 for gate valves and butterfly valves. The tri valve backflow preventer is used with a temporary conventional backflow assembly between existing water main pipe and new/upgraded sections of water main pipe while they are under construction. It is left in place when the temporary backflow assembly is removed. Its use saves extra inspection hours, extra man hours, extra equipment hours, conserves large amounts of good water otherwise needed for flushing, and reduces the safety risk to the public during activation of new water lines.

Abstract: An electrically-actuated flow controller for compressed air systems is disclosed. The flow controller includes a control panel, a transducer for sampling downstream air pressure, an electrical actuator with an electric motor, and a valve driven by the motor. The flow controller also optionally includes a bypass assembly and battery backup system. The transducer measures downstream pressure, and an electrical actuator incrementally positions the valve to maintain set point pressure between the flow controller and the point of use. By using an electrical actuator rather than the traditional pneumatic actuator, the present invention avoids the contamination and response time problems that have plagued earlier flow controllers.

Abstract: The invention relates to a valve combination which is characterized in that the valve combination has a passive valve and an active valve. The active valve is provided with means for an active influence of the control position of a closing element and regulates the fluid flow at a high pressure. The passive valve controls the fluid flow at low pressure. The passive valve and the active valve are integrated into the cooling system pump circuit such that the pressure difference between the high and low fluid pressure and the control positions of the active valve determine the control position of the passive valve.

Abstract: A fluid shutoff apparatus utilizes a float [121] of a float chamber [115] connected to a float-operated valve [113] to provide positive shutoff of fluid to a downstream load upon excessive flow from the fluid outlet [109] of the apparatus. The float-operated valve is shut when fluid discharge from the apparatus is greater than the flow rate from a flow-limiting valve [103] connected to a fluid inlet [107], decreasing the fluid level in the float chamber. The volume of the float chamber prevents inadvertent shutoff of fluid due to normal perturbations in flow to the load.

Abstract: A bypass line assembly comprising a bypass line for transporting a gas in a flow direction, a bypass valve located at a position along the bypass line, and a manual throttle valve located upstream from the bypass valve, the manual throttle valve comprising a throttle valve ball comprising a pressure release passage.

Abstract: A fluid pressure regulator assembly includes a body having a first passageway extending from a first port to a second port, and a second passageway extending from a third port to a fourth port. A pressure regulator is coupled between the second and third ports for controlling the pressure of fluid flowing from the second port to the third port. The regulator assembly further includes a bypass valve and the body includes a housing for the bypass valve. A third passageway extends from the first passageway to the housing, and a fourth passageway extends from the housing to the second passageway. The bypass valve controls flow from the first passageway through the third passageway and the fourth passageway to the second passageway in response to a bypass control signal coupled to the bypass valve.

Abstract: Methods and apparatus for a bi-directional dual chamber orifice fitting comprising a body with a chamber in fluid communication with a flow bore. The fitting also comprises an orifice supported by an orifice plate carrier that is selectably disposable in the bore. In the preferred embodiment, the lower chamber includes two passageways connecting the chamber to the flow bore. One passageway is located on either side of the orifice plate. Each passageway may also be equipped with a check valve to permit flow in only one direction through the passageway. In operation, the passageway on the upstream side of the orifice would allow fluid to flow into the lower chamber while the passageway on the downstream side would prevent flow back into the flow bore.

Abstract: Method and apparatus for isolating hydraulic devices in a stacked hydraulic circuit of modular design employing an isolator valve module which enables partial and/or complete isolation of components in a hydraulic system to be isolated for inspection, testing, maintenance or replacement, by selective operation of the isolator valves in the isolator valve module. The isolator valve module may be a sub-plate module supporting other modules or a plurality of stacks of modules or may be a “sandwich” type module sandwiched between a sub-plate and another module or between two sandwich-type modules.

Abstract: A level control system for controlling the thickness of a work material in a slurry form cast upon a moving belt includes a fluid reservoir disposed above the belt, a sensor lens assembly for sensing the slurry height within such reservoir, and a control valve for adding slurry to the reservoir. A lens disposed near the moving belt and above the reservoir is coupled by fiber optics to a remote sensor amplifier for detecting the height of the slurry. A control circuit responsive to the light sensor regulates the flow rate of the slurry through the control valve.

Abstract: A system for making modular all of the components of hydronic heating systems so that they can be assembled in various configurations with a minimum of error and labor. The system includes a modular transition adaptor that completes a first hydronic loop and provides a supply outlet and return inlet for servicing a second hydronic loop which is dependent from the first. The transition adaptor has standard spacing and fittings for simple and error free connection to other components such as boilers and mechanical modules. The system also includes a modular supply-return connector that can be connected to the branch outlet and branch inlet of the transition adaptor and to other supply-return connectors. Each supply-return connector includes further branches to provide heated liquid to hydronic radiator loops. The supply-return connectors may include pumps or valves.

Abstract: The present invention provides a distributed feed system (10) for use in a cable system (12), where the cable system includes at least two cable subsystems (14a-14d). The distributed feed system is adapted to feed a performance-enhancing compound into each of the cable subsystems. The distributed feed system includes a central feed station (22) having a tank (24) for holding the performance-enhancing compound. The distributed feed system further includes an impermeable or low-permeable distribution conduit (26a-26c) that connects the central feed station to each of the cable subsystems to permit distribution of the performance-enhancing compound therethrough to each of the cable subsystems.

Abstract: During the pumping of corrosive gases, it is advantageous to admit a seal gas to endangered pumping chambers at a lower flow rate and a higher pressure than the corrosive gases. Inert gas from a supply (3) has its pressure reduced by a pressure reducer (6). An on/off valve (7) controls a flow of the inert gas through a flow restriction (8) which restricts the flow of inert gas to appropriate sealing gas rates at an outlet (4). After pumping the corrosive gas, a control valve (12) in a bypass line (11) causes the inert gas to be supplied to the outlet (4) at a higher flow rate for purging the pump.

Abstract: A motorized rotary water valve has an integrally formed one piece motor housing and emergency bypass channel. A solenoid operated valve is integrally provided on the bypass channel and is spring biased to the open position upon shut off of electrical power to the solenoid.

Abstract: A circulating valve and associated methods of using same provide control of fluid flow within a subterranean well. In a described embodiment, a circulating valve includes a fluid pressure storage chamber in fluid communication with the exterior of the valve. When positioned in a wellbore, fluid pressure in an annulus between the valve and the wellbore is stored in the storage chamber. A subsequent, relatively rapid, increase in the annulus fluid pressure causes the valve to operate.

Abstract: Disclosed is a pressure/flow rate control valve comprising a valve-opening/closing section having a valve plug which is installed with an elastic member having a substantially tapered cross section at one end, a stem which is displaceable integrally with the valve plug and which is installed with a packing disposed between a pair of disk sections separated from each other by a predetermined spacing distance, and a spring member which is fastened to one end of the stem, for seating the valve plug on an annular projection in accordance with the action of resilient force.

Abstract: Disclosed is a pressure/flow rate control valve comprising a pressure-adjusting section having a valve plug for reducing the pressure of a pressure fluid flowing through a clearance between a hole and itself, a stem which is displaceable integrally with the valve plug and which is installed with a packing, and a spring member which is fastened to one end of the stem, for pressing the valve plug toward an annular projection formed on an inner wall surface of a first valve body.