Abstract: A flexible drive mechanism for a flushing apparatus actuated by movement of a flush handle via an actuation element is disclosed. The drive mechanism includes a housing and flexible drive system in the housing, the flexible drive system including an actuating element operable to move the flush handle between a non-actuating position and a full stop actuating position. The housing further includes first and second bracket halves and first and second removable insert halves for adapting the first and second bracket halves to substantially enclose and engage a bushing and nut and thereby secure said electromechanical flexible actuator to the flush lever of the sanitary fixture.

Abstract: The valve includes a valve element with an internal longitudinal bore and cross-drilled orifices which, in combination with other orifices and restrictions, force balance the valve in an open configuration when attached to a pump assembly in a spilling mode.

Abstract: Pre-controlled valve, in particular an electropneumatic regulating valve for an air brake system of a motor vehicle, comprising a valve housing (1), which contains an axially adjustable control piston (5) and which can be actuated by means of at least one electromagnetic pilot valve (6) for axial adjustment, and which is provided to actuate a valve seat assembly (9), which switches the compressed air flow between at least one external brake line connection (15), a feed pressure connection, as well as a venting port (17), and which comprises in essence a pot-like sealing cup (12) with a coaxial passage (23), the circular ring-shaped sealing area (13) of which corresponds with a coaxial valve seat assembly, constructed out of an external valve seat (11) and an internal valve seat (10), whereby the sealing cup (12) exhibits an internal reinforcing insert (24), which is formed essentially in the shape of a U according to the cross section of the edge and which is provided with a molded-on shoulder (25), which is

Abstract: To simplify and facilitate working/grinding or the like on a valve hole in a body for a valve reduce a manufacturing cost of the body for a valve. A body for a valve 10 provided with a valve hole for inserting a valve member slidably therein is formed by splitting the body for a valve on split faces 13 including an axial line of the valve hole and extending along directions of flow paths 12p, 12a, 12b, 12r communicating towards the valve hole from ports P, A, B, R opened to a body outer face and mutually joining body portion pieces which are respectively molded individually.

Abstract: A bathroom flusher includes a flusher body, a valve assembly, an electronic control system, and a flusher cover. The flusher body includes an inlet and an outlet, and is designed to accommodate the valve assembly that controls water flow between the inlet and the outlet. The valve assembly includes a valve member movable with respect to a valve seat providing a sealing action based on applied pressure on the valve assembly. The bathroom flusher also includes an external cover designed for enclosing an electronic control module comprising a battery, a sensor, and an actuator for controlling operation of the flush valve, wherein the external cover includes at least two cover parts separately removable, and wherein the external cover is attachable with respect to the valve body in a manner also allowing removable attachment of the control module.

Abstract: According to one aspect of the disclosure, the present invention provides methods and arrangements for controlling supply process gas to a process chamber for use in the manufacturing industry. Methods include controlling the operation of a valve coupled to the supply process gas line in a way such that pressure bursts in the process chamber due to the operation of the valve are reduced, or even eliminated.

Abstract: A valve for controlling fluids, having a piezoelectric actuator unit for actuating a valve member that is disposed in an at least one-piece valve body and that has at least one displacement piston communicating with the actuator unit and at least one actuating piston operatively connected to the displacement piston via a hydraulic coupler, which actuating piston is connected to a valve closing member which cooperates with at least one valve seat and in the closing position disconnects a control chamber from an outlet chamber, the hydraulic coupler being provided with a filling device. The valve closing member has a pistonlike cylindrical region, which with the valve body forms at least one filter gap for the fluid to be delivered to the filling device, and at whose level an inlet conduit of the filling device branches off.

Abstract: A three-stage relay control is provided for regulating the flow of gas through, for example, gas valves. The relay control includes a control arm for providing three levels of gas flow and having three adjustment screws, one for controlling the flow at each stage of operation. The control arm preferably pivotally rotates to provide the three gas flow levels. Energizing the relay control at three different amperage levels provides the three-stages. At a low-flow stage, the relay is de-energized. At a high-flow stage, the relay is fully energized. At a mid-flow stage, between the high-flow and low-flow stage, the relay is energized at an intermediate amperage.

Abstract: A hydraulic actuator operates either an intake or an exhaust valve for an engine cylinder. A driver piston is adapted to be operably connected to open and close the engine cylinder valve. An electrically driven operator produces movement of a valve spool which controls flow of fluid to and from the driver piston. A feedback mechanism is coupled to the valve spool and responds to movement of the driver piston by moving the valve spool into a position at which fluid flows neither to nor from the driver piston. The feedback mechanism ensures that the stroke of the hydraulic actuator is proportional to the magnitude of the electric current applied to the operator regardless of variation of the fluid pressure applied to the driver piston.

Abstract: An injector injects fluids, such as hydrate inhibitors into a pipeline such as a natural gas pipeline. The injector is comprised of two motor valves with different force constants such that they open and close in a sequence that injects fluid into the pipeline. The motor valves are controlled by pressure in a control line, where the pressure in the control line is controlled by a latching solenoid valve that pressurizes and vents the control line, according to the signals received from a control panel. When used with a natural gas pipeline, the displaced natural gas captured by the overhead storage tank can be used to fuel a natural gas heater.

Abstract: In a pilot-operated valve having a valve body, including inlet and outlet portions controllably interconnected via a main piston bore portion; a main piston movable within the main piston bore; an operator portion; an operator assembly including a movable plunger assembly; and an actuating mechanism for actuating the plunger assembly, wherein the improvement comprises a further bore located within the valve body and a manually-operated override assembly retained therein, including a stem having a tool actuating portion; a cam portion extending radially into the operator bore portion and, upon a first predetermined rotation physically actuating the plunger assembly; and an actuating surface extending tangentially into the main piston bore portion which, upon a second rotation physically actuates the main piston. A method of actuating the manual override assembly is also set forth.

Abstract: A gas regulator (14) is provided for regulating the pressure of a gas flowing from a source (12) of the gas under pressure to a device (24) for using the gas. The regulator (14) includes a housing (26) and a pressure reducing valve (36) in the housing for controlling the flow of gas from an inlet (28) under pressure to an outlet (32) at a regulated pressure. The pressure reducing valve is controlled by a pressure responsive member (40, 44) which is displaced by operating feed and bleed valves (50) coupled to a control chamber (46) of the pressure responsive member. The feed and bleed valves are operated by a high speed solenoid actuator (68). The bleed valve is vented to the outlet of the housing from the control chamber which is maintained at a higher pressure. The high speed solenoid actuator (68) is operated by a controller (18) for controllably varying the output pressure as desired.

Abstract: An electro-hydrostatic actuator having a sealed housing filled with a dielectric fluid. A motor driven pump and electronics for controlling the pump are all immersed in the fluid. The pump is arranged to deliver fluid from the housing to a hydraulic cylinder to control the positioning of the piston rod. A solenoid operated valve is integrated as a bypass or tip valve for quick fail safe position. The actuator is ideally suited to control various types of plunger valves. In one embodiment of the invention, the hydraulic cylinder is located outside of the housing and in another embodiment the cylinder is located inside of the housing.

Abstract: A valve arrangement that controls fluid flow of a working fluid in a fluid system. The valve arrangement including a valve body having first, second, and third pressure chambers functioning under pressure of an operating fluid. The operating fluid is independent of the working fluid. The valve arrangement further including a solenoid valve arranged with the valve body to operably provide fluid communication between the first pressure chamber and the second and third pressure chambers.

Abstract: An hydraulic valve arrangement including a fluid pressure actuable valve which is actuable between a first position in which fluid flow through the fluid pressure actuable valve is prevented and a second position in which fluid flow through the fluid pressure actuable valve is permitted at a first rate. The hydraulic valve arrangement also includes a second valve which is actuable between an open state, in which fuel flows through the second valve at a second rate, and a closed state in which there is no flow through the second valve.

Abstract: Hydraulic engine valve actuation systems and methods for internal combustion engines. The systems utilize a proportional valve to regulate the flow of a working fluid to and from a hydraulic actuator controlling the engine valve position. The position of the proportional valve is controlled by one or more high speed valves to control various engine valve parameters, including engine valve takeoff and landing velocities. Returning all valves to a known starting position between engine valve events avoids accumulation of errors in proportional valve positioning. Embodiments using spool valves for the high speed valves and the proportional valve, and spring return and hydraulic return for the engine valve, are disclosed. A specially shaped spool in the proportional valve provides enhanced control over the engine valve operation. Various further alternate embodiments are disclosed.

Abstract: An axial valve has a housing, an inlet, an outlet, a valve seat between the inlet and the outlet, and a valve element cooperating with the valve seat, and is controlled by a pilot valve arranged between the inlet and the outlet, with the valve element being moveable parallel to a flow path from the inlet to the outlet and surrounding an interior space. Without changing the external measurements of the valve an increased through flow is achieved in that a first section of the flow path leads through the interior space and a pressure space is arranged between the housing and the valve element, in which pressure space in the closed condition of the pilot valve a closing pressure is formed and applied to the valve element.

Abstract: A hydraulic actuator operates either an intake or an exhaust valve for an engine cylinder. A driver piston is adapted to be operably connected to open and close the engine cylinder valve. An electrically driven operator produces movement of a valve spool which controls flow of fluid to and from the driver piston. A feedback mechanism is coupled to the valve spool and responds to movement of the driver piston by moving the valve spool into a position at which fluid flows neither to nor from the driver piston. The feedback mechanism ensures that the stroke of the hydraulic actuator is proportional to the magnitude of the electric current applied to the operator regardless of variation of the fluid pressure applied to the driver piston.

Abstract: A valve arrangement that controls fluid flow of a working fluid in a fluid system. The valve arrangement including a valve body having first, second, and third pressure chambers functioning under pressure of an operating fluid. The operating fluid is independent of the working fluid. The valve arrangement further including a solenoid valve arranged with the valve body to operably provide fluid communication between the first pressure chamber and the second and third pressure chambers.

Abstract: A flush valve includes: a valve body; a diaphragm valve flexibly mounted in the valve body; a central partition plate secured in the valve body having a valve seat annularly formed in the central partition plate to be seated by the diaphragm valve for closing an outlet port of the diaphragm valve; a valve flap held on the diaphragm valve having at least one rubbing pin formed on the valve flap for reciprocatively rubbing or purging any scales or dirts accumulated in the releasing hole or capillary hole formed through the diaphragm valve for preventing clogging of the releasing hole; a manual relief valve and an electrically operated relief valve respectively formed on the valve body.

Abstract: An electronically modulating gas valve comprising a modulating solenoid for simultaneously displacing two servo regulator diaphragms, one for controlling LP Gas outlet pressure and another for controlling Natural Gas outlet pressure. A switch is used to select operation with either Natural or LP Gas, wherein the switch activates a gas selection solenoid for controlling gas flow through the Natural Gas servo regulator and the LP Gas servo regulator. The servo regulators are factory adjusted for a maximum Natural Gas pressure setting and a maximum LP Gas pressure setting. Thus, the gas valve is convertible from Natural Gas to LP Gas without re-adjustment.

Abstract: In a pressure-responsive actuator, the inside of a case is divided into first and second air chambers by a diaphragm, and a coil spring is accommodated in the second air chamber for exerting a spring force for urging the diaphragm in a direction to decrease the volume of the first air chamber. A rod is coaxially connected at one of opposite ends to a side of a retainer mounted to a central portion of the diaphragm on the side of the first air chamber and at the other end to a tip end of an arm fixed at its base end to a driven shaft rotatable about an axis perpendicular to a plane parallel to the rod. In this pressure-responsive actuator, the case is provided with a tilt-restricting portion for restricting the tilt of the rod to a range in which the contacting of the diaphragm with the inner surface of the case can be avoided.

Abstract: A valve for bringing gaseous fuel into the combustion chamber of gas engines is provided with a solenoid valve (8) controlling fuel delivery (7) and an adjoining poppet valve (2), which closes biased by the force of a spring, and which opens in the direction of the combustion chamber through the pressure of in-flowing gas. For the purpose of keeping the poppet valve (2) open, independent from the pressure conditions at its valve head (3), the valve's stem (4) is connected to a step piston (6) whose topside and bottom side are biased by the fuel pressure existing between the solenoid valve (8) and the valve head (3) and whose step area (12) is in communication with the fuel delivery line (7), on one side, and with the space (11) between the step piston (6) and the valve head (3), on the other side, whereby the passageways (15, 15′, 17, 17′) are opened and closed by means of a respective switching member (13, 14, 20) corresponding to the movement of the step piston (6).

Abstract: A solenoid-controlled pilot-operated valve includes an operator assembly containing a solenoid that operates a pilot valve. The pilot valve in turn controls a pressure-relief opening from a chamber whose pressure tends to hold a main valve closed until the pressure is relieved. The pilot-valve body, which forms the pilot-valve inlet, outlet, and seat is secured to the operator assembly's stationary part, and the resultant structure is only then assembled together with the main valve. This enhances positioning repeatability and thus consistency in valve timing.

Abstract: An air turbine starter valve able to open despite being frozen shut. Dual actuators apply sufficient torque upon an air turbine starter valve to overcome obstructions presented by frozen moisture. By applying separate and generally-aligned torques, the actuators are able to provide sufficient force to overcome the adhesion provided by frozen moisture between the valve plate and adjacent structures.

Abstract: A control device for switching an intake or exhaust valve of an internal combustion engine has a control valve with a control valve piston for controlling flow of a hydraulic medium from a pressure line to the intake or exhaust valve. At least one actuating element is correlated with the intake or exhaust valve and has a first end acted on by the hydraulic medium. At least one damping device interacts with the at least one actuating element and is arranged at a second end of the actuating element opposite the first end. The at least one damping device exerts a damping force onto the actuating element counteracting a force exerted by the hydraulic medium.

Abstract: A valve includes a housing having a fluid inlet and a fluid outlet and defining a fluid flow path between the inlet and the outlet. A check valve positioned in the housing has a valve seat in the flow path from the inlet, a valve member movable between a seated position against the valve seat blocking fluid flow from the inlet past the valve seat and an unseated position spaced away from the valve seat, and a spring for biasing the valve member toward the seated position. A main valve assembly is removably positioned at a home position in the housing in the flow path to control the fluid flow from the check valve to the outlet. The valve assembly has a portion which engages the valve member and maintains the valve member in it's unseated position so long as the main valve assembly is at the home position, the valve member being moved to the unseated position by the spring upon removal of the main valve assembly from the housing.

Abstract: A shut-off valve apparatus has a valve body and a valve member coupled to the valve body. The valve member is movable between a first position blocking material flow through the valve body and a second position permitting material flow through the valve body. A pneumatic actuator receives pressurized air to move the valve member from the first position to the second position. A pneumatic exhaust controller controls the flow of pressurized air into and out of the pneumatic actuator.

Abstract: A shut-off valve assembly has a main valve module and an electrically-controlled, pneumatically-actuated operator that moves the main valve module between an opened and a closed position. A number of different shut-off valve assemblies are assembled from various components or modules, such as pneumatics modules, switch assemblies, main valve modules, and solenoid valve components. The main valve modules have a variety of sizes and pipe connection styles. In some embodiments, pressurized air is supplied to the pneumatic actuator from pressurized air equipment that is situated in a facility remotely from the shut-off valve apparatus and in other embodiments, an air-delivery module is coupled to the pneumatics module to provide pressurized air to the pneumatic actuator.

Abstract: In some hydraulically actuated fuel injectors, a pressure communication passage extends from a pilot valve to the underside of a spool valve to control movement of the same. For the spool valve to move, a substantial amount of fluid flow past the pilot valve is required due to the relatively large amount of fluid that must be displaced by movement of the spool valve member. However, during cold start, when the oil in the pressure communication passage is relatively viscous, it is difficult to move enough fluid past the relatively small flow area through the pilot valve to allow the spool valve to advance to its upper position. Therefore, the fuel injector of the present invention includes a pressure communication passage that is connected to the underside of the spool valve to be separated from the branch that passes through the pilot valve.

Abstract: The object of the present invention is to provide a solenoid control valve simple in construction and low in cost, realized by reducing the number of component parts, eliminating screw-joined portions, and minimizing the use of rubber O rings. A valve hole of a pilot valve, a hole of a bearing for supporting one end of a shaft of a solenoid, and a fitting hole in which is fitted one end of a sleeve, are formed along the same axis in a body. This makes it possible to accurately establish the concentricity of movable components of the solenoid when the sleeve is fitted in the fitting hole, and hence, a pilot valve element can be integrally formed with the shaft. Set values for a main valve and the pilot valve are adjusted by adjusting the amounts of insertions of a press-fit member and a bearing by press-fitting.

Abstract: To provide a differential pressure valve simplified in construction. A piston integrally formed with a main valve element is arranged on the upstream side of a main valve formed by the main valve element and a main valve seat, to thereby define a chamber for introducing refrigerant from an inlet port. The piston is provided with an orifice and a refrigerant passage for the communicating with a chamber on a back surface side of the piston. The chamber on the back surface side of the piston is configured such that it can be connected, via a refrigerant passage and a pilot valve formed by a pilot valve seat and a pilot valve element, to a chamber on the downstream side of the main valve, which communicates with an outlet port. Refrigerant from the inlet port is supplied the pilot valve via the orifice, and the refrigerant passages.

Abstract: This invention relates to a remote shut-off valve, and in particular to a valve for the remote shutting-off of a fluid such as a mains water supply.

Abstract: A fluid pressure controller has an air supply valve plug displaceable under an action of pilot pressure of a pilot chamber. When the air supply valve plug is seated on a seat section, fluid communication between a supply port and a regulator port is interrupted. Further, the fluid pressure controller has a solenoid valve. When electric power supply to the solenoid valve is interrupted, the solenoid valve is opened to generate pilot pressure applied to the air supply valve plug by the original pressure of pressurized fluid introduced from the pressurized fluid supply source to the supply port.

Abstract: A flexible drive mechanism for a flushing apparatus actuated by movement of a flush handle via an actuation element. The drive mechanism includes a housing and flexible drive system in the housing, the flexible drive system including an actuating element operable to move the flush handle between a non-actuating position and a full stop actuating position. The flexible drive system is maintained in substantial continuous contact with the flush handle as the flush handle moves to its full stop position, and the flexible drive system continues to operate without stalling after the flush handle reaches its full stop position as a support plate for the motor and flexible drive system changes position to provide flexure or “give” between the flush handle and the actuating element to prevent stalling of the flexible drive system. In another embodiment, the flexible drive system includes a cam having a main body part and a flexible body part, with a bias element between the body parts.

Abstract: The valve includes a valve element with an internal longitudinal bore and cross-drilled orifices which, in combination with other orifices and restrictions, force balance the valve in an open configuration when attached to a pump assembly in a spilling mode.

Abstract: Electrohydraulic device for operating an intake or exhaust valve of a combustion engine; the electrohydraulic device comprises a linear hydraulic actuator designed to move the valve axially from a closed position to a maximum opening position, and an electronic control hydraulic distributor designed to regulate the flow of pressurized liquid from and towards the linear hydraulic actuator in order to control movement of the above-mentioned valve between the closed and maximum opening positions; the electronic control hydraulic distributor comprises a slide valve which, by selection, can be set to three positions: a first operating position in which it establishes direct communication between the linear hydraulic actuator and an outlet of the pressurized liquid, a second operating position in which it isolates the linear hydraulic actuator in such a way as to prevent the flow of pressurized liquid from or towards the actuator, and a third operating position which establishes direct communication between the lin

Abstract: A two-stage, bi-directional valve is provided for controlling gas flow into and out of a storage volume. The solenoid is provided to actuate a first stage piston to seal communication with a pressure source. In doing so, the sources imparted by the solenoid overcome biasing forces applied by a resilient spring on the first stage piston. Simultaneously, actuation of the first stage piston opens the bleed passage to permit the depressurization of space behind the second stage valve. Upon sufficient depressurization, the second stage valve is unseated from the main orifice by fluid pressure forces, thereby creating the flow path for escape of the gaseous fluid through the main orifice.

Abstract: The hydraulic system for actuation of the mud valve of a measurement-while-drilling tool is characterized by a hydraulic actuator having a piston operatively connected to the mud valve of a measurement-while-drilling tool, which hydraulic actuator incorporates an internal by-pass which, cooperatively with movement of the piston, opens to unload hydraulic pressure from the system at either end of stroke of the piston. Return from the by-pass to the pump may be restricted so as to maintain some hydraulic pressure on the piston at end of stroke so as to prevent movement therefrom by external forces. The hydraulic system may include a high pressure relief valve, hydraulic fluid strainer and a device to equalize pressure between hydraulic system pressure and pressure external of the system.

Abstract: A solenoid valve is described comprising a hydraulic valve a valve body in which said hydraulic valve is housed and a control solenoid for said valve. The solenoid valve has in addition a programmable electronic control device that is housed together with said solenoid in a removable way inside an openable watertight container that is tightly fastened to said valve body.

Abstract: An improved electrically operated pilot-type, “instant-on” solenoid assembly for near-instantaneous control over the flow of compressed gas. The assembly may be applied in fuel systems for propulsion in vehicles using gaseous fuel. It includes a housing with inlet and outlet passages connected to a primary chamber where a primary piston is slidably mounted, a secondary chamber having a secondary piston slidably mounted within the chamber, a solenoid to produce translational movement of the pilot piston, and passageways linking the various components. When the solenoid is energized, the pilot piston is moved to permit fluid to flow from the primary to the pilot chamber, producing an increase in the differential pressure in the regions of the primary chamber. The differential pressure then forces the primary piston to move, exposing the outlet to fluid flow from the gas inlet.

Abstract: An apparatus for controlling a blowout preventer stack. The apparatus comprises a control pod having a plurality of direct operated solenoid valves in electronic communication with a surface controller through one or more dedicated electronic control wires. The solenoids translate electronic control signals from the controller into hydraulic control signals that are in communication with a hydraulically operated pilot valve to cause delivery of hydraulic fluid from a power fluid source to a critical function of the blowout preventer stack (i.e., closing of a blowout preventer). The system also provides a plurality of hydraulically operated pilot valves that deliver hydraulic fluid from a power fluid source to a non-critical function of the blowout preventer stack upon receiving a hydraulic control signal directly from the controller through the umbilical.

Abstract: A diaphragm pump, in which a working fluid control valve (D) opens a working fluid make-up passage (B24) to prevent a diaphragm (C) from being damaged when an excessive discharge pressure acts on the diaphragm. The working fluid control valve (D) for opening and closing the working fluid make-up passage (B24) is provided with a valve disc formed to be capable of reciprocating relative to the diaphragm (C) in a valve disc receiving chamber (B2) to close an opening of the valve disc receiving chamber (B2), means for biasing the valve disc toward the diaphragm, and means for closing the working fluid make-up passage (B24) when a distance, over which the valve disc extends from the opening of the valve disc receiving chamber, exceeds a predetermined value.

Abstract: A binary voting solenoid arrangement 10 is provided which operates in a “2 out of 3” manner to provide relatively high safety, low spurious tripping and a relatively low installation cost, while also enabling on-line testing of each solenoid individually without process interruption. Solenoid arrangements 10, 10′ and 10″ are preferably used in a three-way configuration, while solenoid 10′″ may be used in a two-way configuration.

Abstract: A high flow valve assembly and a low flow valve assembly are in parallel flow relation between an inlet and an outlet of a flush controller. The valve assemblies are opened by solenoid operated pilot valves under the control of a microprocessor based flush control system. A turbine directly measures flow through the low flow valve assembly by providing pulses to the microprocessor, and the control system counts pulses and computes flow through the high flow valve assembly to perform a flushing operation including an initial siphon trap flushing high flow portion and a subsequent trap reseal low flow portion. Corrections are made to the pulse count to correct for partial valve open conditions and other variables. An override switch provides a signal to the control system for a flush operation A user detection system includes a pair of emitters and a pair of detectors defining an array of intersecting detection points in a skewed plane in which the control system can locate the position of a user.

Abstract: A flow control valve in which pressure differential in a pressure cavity is maintained by a diaphragm attached at its lower end to a valve closure plug, and movable therewith, and attached at its upper end to a portion of valve body that forms the pressure cavity. The diaphragm has a stepped portion between its upper and lower ends which extends in the direction of motion of the valve plug, which folds back on itself when the valve opens. The valve body has shoulder portions that support the diaphragm when the valve is closed to avoid stressing the diaphragm material due to pressure in the pressure chamber. The stepped design allows the outside diameter of the diaphragm to be minimized, and eliminates the need for fabric reinforcement. A bleed passage provides pressure communication between the pressure cavity and the inlet side of the valve.

Abstract: A valve for bringing gaseous fuel into the combustion chamber (1) of gas engines includes a solenoid valve (5) controlling the fuel supply (2) and an adjoining check valve (7) designed as a poppet valve, which is closed by the force of a spring and which opens in the direction of the combustion chamber through the pressure of gas flowing from the opened solenoid valve (5).

Abstract: A binary voting solenoid arrangement 10 is provided which operates in a “2 out of 3” manner to provide relatively high safety, low spurious tripping and a relatively low installation cost, while also enabling on-line testing of each solenoid individually without process interruption. Solenoid arrangements 10, 10′ and 10″ are preferably used in a three-way configuration, while solenoid 10′″ may be used in a two-way configuration.

Abstract: A high flow valve assembly and a low flow valve assembly are in parallel flow relation between an inlet and an outlet of a flush controller housing. The valve assemblies are opened by solenoid operated pilot valves under the control of a microprocessor based flush control system. A turbine directly measures flow through the low flow valve assembly and the control system computes flow through the high flow valve assembly to perform a flushing operation including an initial siphon trap flushing high flow portion and a subsequent trap reseal low flow portion. A push button is pressed to one of two override positions either to provide a signal to the control system for a normal flush operation or to open the high flow valve assembly independently of the control system for an emergency flush operation. A user detection system includes a pair of emitters and a pair of detectors defining an array of intersecting detection points in a skewed plane in which the control system can locate the position of a user.

Abstract: A counter-flow prevention valve is disposed within a body of a pilot-type channel valve. While electrical power is applied to a solenoid coil and the pilot-type channel valve is opened, i.e., while a gas is flowing through the counter-flow prevention valve and the gas is expanding, heat generated by the application of electrical power to the solenoid coil is conducted via the body and is effectively transferred to the counter-flow prevention valve. Therefore, even if the gas contains water vapor and even if this gas is cooled due to significant expansion, the water vapor can be prevented from freezing within the counter-flow prevention valve. Moreover, the volume of the pipe between the pilot-type channel valve and the counter-flow prevention valve is small, thereby resulting in a fast rise in pressure within the pipe and a quick opening of the counter-flow prevention valve, which provides an excellent valve-opening response.