Abstract: The invention concerns a method supplying volume streams of fluids in channels or capillaries of small stream cross sections, more particularly chromatographic separating columns for the analytical fluid metrology, wherein a delivery device for delivering a volume stream of the fluid through an operating channel and a pressure measuring device for measuring the pressure in the operating channel is provided, wherein a measurement of the volume stream is possible, characterized by the following steps: a) Recording a time reference pressure course using the pressure measuring device in the operating channel, while the delivery device delivers an essentially constant, pre-determinable reference volume stream through the operating channel of a fluid with properties, more particularly flow properties, varying over time; b) Calculation of a time development of the operating pressure, which corresponds to the essentially constant and preferably small operating volume stream through the operating channel, which is d

Abstract: In order to free a seized valve, an inspection port is formed in a wall of the valve body and the areas where the valve is seized are determined. One or more injection ports are formed in the valve body adjacent to the seized portions of the valve, pressurized fluid (preferably an insoluble lubricant having a very high cone penetration) is injected through the or each injection port and the injection ports are then closed.

Abstract: The present invention relates to a throttle valve, particularly for controlling a liquid flow in a central heating or an air conditioning system, with a flow control unit having a first and a second element (18, 30), which are movably mounted relative to each other for setting a desired flow, characterised in that the first element (18) is designed as a first disc, and the second element (30) is designed as a second disc, and that the first and the second disc (18, 30) are mounted tight on each other in such a way that the first disc (18) may be rotated relative to the second disc (30), the first disc (18) exhibiting at least one first flow aperture (36) and the second disc (30) exhibiting at least one second flow aperture (38), the desired flow being adjustable through the degree of overlapping of the at least one first flow aperture (36) and the at least one second flow aperture (38), the at least one first and the at least one second flow aperture (36, 38) being designed such that, by rotating the first di

Abstract: The present invention provides a construction machine with a structure of pilot pipe comprising detection ports for detecting pilot pressure in a body of a switching valve, so that the number of pipe connecting positions and pipe assembly parts such as joints and the like can be decreased and arrangement of the pipe can be simplified.

Abstract: A combination solenoid operated flow control valve and solenoid operated by-pass valve and pressure transducer are disposed in a common housing with a common electrical receptacle for connection thereto. The pressure transducer senses differential pressure across a metering orifice. The pressure transducer measures flow through the metering orifice during leak testing. A vacuum is drawn in the system for leak testing. The by-pass valve is opened to bypass the metering orifice and permit full flow to the flow control valve during normal engine operation.

Abstract: A modular cooling system adapter for coupling to an orifice and applying pressure from a source of pressurized gas. The adapter includes a universal cooling orifice fitting for attaching the device to cooling system orifices of various sizes and configurations. The universal fitting preferably includes a plurality of steps having outer axially extending surfaces disposed at a slight negative angle to a plane parallel to the axial direction. The adapter may include a pressure adapter for coupling to a source of pressurized gas, such that the pressure adapter can be interchanged with other diagnostic tools including a valve assembly, a valve assembly incorporating a temperature probe and gauge and/or a pressure gauge. Additionally, the cooling system adapter is fully modular in that it allows quick disassembly for replacement of components and interchangeability of diagnostic tools.

Abstract: A pressure control apparatus which controls a pressure of air supplied from a supply hole of a base having a plurality of holes to a supply port of a valve having a plurality of ports is interposed between the base and the valve. This pressure control apparatus comprises a pressure control section which controls a pressure of the air such that the pressure becomes equal to a set pressure, a booster section which outputs a large amount of air to the valve by controlling an output pressure by air from this pressure control section, and a signal control section which outputs a monitor signal indicative of completion of pressure setting when the pressure of air output from the booster section becomes equal to the set pressure.

Abstract: In the manifold valve of the invention, a sensor chamber is formed in an upper face of a casing of a solenoid valve, pressure sensors are disposed in the sensor chamber, a wiring block including a wiring path in itself is connected to a portion of the casing, and signal conductors extending from the pressure sensors are introduced into a wiring path in the wiring block and are connected to a main wiring substrate through an intermediate block.

Abstract: A vapor purge system that permits evaluation of the system with a minimum number of hoses and connections, and without the use of additional components. The system includes a valve having first and second ports in communication with a first chamber and a third port in communication with a second chamber, the first and second chambers being defined by a metering member that divides an internal volume of a housing. A first conduit connects a diagnostic member having first and second operative states with the first chamber, the connection being made through the second port. The first operative state prohibits communication with an exterior of the valve, and the second operative state permits communication with the exterior. The diagnostic member provides the ability to reliably measure flow through the valve. The system can use three (3) hoses including five (5) connections from a vapor supply port connected with the first port to the third port operatively connected with a manifold.

Abstract: A control device for pressurized fluids includes a valve mechanism actuated by a first device incorporating electromagnets in a first housing, and a second device incorporating a circuit board for controlling the valve mechanism in a second housing. Pins on the first device and sockets on the second device automatically form an electrical plug-type connection when the housings are joined. Each socket is received in a first portion of a through-hole provided in a mount supported on the circuit board such that it extends into a corresponding through-hole in the circuit board. A second portion of each through-hole in each mount has a funnel-shaped guide opening toward the pins. A pressure sensor supported by the circuit board forms a plug-type engagement with a port extending from the valve mechanism when the housings are joined. Contacts extend from the sensor into holes in the circuit board.

Abstract: The invention is system and method for detecting a leak and operating an existing valve in response to the detected leak. In this regard, a receiving unit may be installed on an existing shutoff valve. The valve may control the flow of a fluid into a site. A transmitting unit may be installed in the vicinity of an appliance receiving the fluid. The transmitting unit may include a detector capable of detecting the fluid. In response to the detector detecting the fluid, the transmitting unit may transmit a signal including a unique 32 bit code. A receiver within the receiving unit may be capable of receiving the signal. Additionally, a PIC microprocessor within the receiving unit may be configured to receive the signal from the receiver and determine if the signal contains the code. In response to determining the signal contains the code, the PIC may control a motor to operate (e.g., turn off) the valve. The motor may be configured for attachment to the valve via a coupler.

Abstract: Regulator for precision control of pressure based on a means of measuring pressure differentials. More specifically, the present invention provides a pressure control that tracks a relatively high background pressure, and applies a positive or negative offset to create the small pressure differentials that can be utilized to transport fluids within a capillary network. The present invention is also directed to a method of controlling microfluidic elements (such as donut cavities) with a high degree of precision. In high performance liquid chromatography applications, this is accomplished using tracking pressure regulators to measure and respond to the difference between the liquid pump pressure and the regulated pneumatic pressure.

Abstract: A manifold assembly is provided for controlling and distributing compressed air from an air compressor to one or more air powered tools. The manifold assembly may be attached directly to the air compressor, or, alternately, removed from the air compressor and coupled thereto via an air conduit, e.g., an air hose or the like, so that the manifold assembly can be used at locations remote from the air compressor.

Abstract: The present invention provides multi-layer microfluidic systems, by providing additional substrate layers, e.g., third, fourth, fifth and more substrate layers, mated with the typically described first and second layers. Microfabricated elements, e.g., grooves, wells and the like, are manufactured into the surfaces between the various substrate layers. These microfabricated elements define the various microfluidic aspects or structures of the overall device, e.g., channels, chambers and the like. In preferred aspects, a separate microscale channel network is provided between each of the substrate layers.

Abstract: A mechanical gauge having a mechanism for setting multiple alarms within tolerance values. When such tolerance values defined by the mechanism are reached, the same mechanism activates an alarm.

Abstract: A damper system with a sealing plug, which incorporates an air flow monitoring system. The damper system utilizes current designs of the iris damper and incorporates a sealing plug positioned in the open circular cross-section of the iris damper. One version of the sealing plug incorporates a sealing groove in the sealing plug, while another version employs different types of sealing gaskets. The sealing groove and sealing gaskets provide a positive seal about the sealing plug when the iris blades are in the closed position. An additional feature that can be incorporated into the sealing plug is an air flow monitoring system. The sealing plug can include a chamber where total pressure of the air flow passing the sealing plug can be measured.

Abstract: A variable device for regulating the outlet pressure of a fluid from a valve body, includes a pressure-sensing chamber having a wall formed by a resilient self-restoring diaphragm which is responsive to pressure in the chamber. A valve element connected to the diaphragm controls flow into the chamber. Increased pressure in the chamber decreases the flow into the chamber and decreasing pressure increases flow whereby fluid flow out from the chamber is maintained at a desired pressure. The outlet pressure is adjusted by deflecting the diaphragm in a direction to open the valve while permitting a section of the diaphragm connected to the valve member to remain responsive to the pressure in the chamber. An adjustment cover is provided to adjustably deflect the diaphragm and includes a catch mechanism to allow adjustment of the fluid outlet pressures and also retain the device at a desired value. An indicator arrangement may be provided to visually indicate the fluid outlet pressure.

Abstract: This invention concerns a high rate discharge valve for high pressure gas cylinders provided with two separate openings, one for discharging and the other for refilling gas so that the empty cylinders can be refilled quickly and easily without disconnecting the valves from the gas discharge hose. This would indirectly make it possible to refill the cylinders on site, namely in the same room where the bank of cylinders is installed.

Abstract: To provide a solenoid valve having a sensor in which monitor devices for monitoring whether input or output pressure in the solenoid valve is appropriate and a switching state of a valve body are collected to simplify the structure and to facilitate the assembling operation, thereby enhancing safety and reliability. A solenoid valve having a sensor comprises a solenoid valve 1, a base 2 for supplying and discharging pressurized fluid to and from ports P, A, B, EA and EB of the solenoid valve 1, and an intermediate block 3 disposed between the solenoid valve 1 and the base 2. The intermediate block 3 is provided with communication passages 53, 54A, 54B, 55A and 55B for respectively bringing the ports of the solenoid valve and flow paths of the base into communication with each other. A conduit 56 crossing the communication passages is provided in the intermediate block 3. A pressure introducing port 58 opening at the communication passage 53 whose pressure is to be detected is formed in the conduit.

Abstract: An alarm valve system includes a valve body, a valve seat in the valve body with a groove in the sealing face of the seat. A valve element is positioned to seat on the sealing face. A vent extends from the groove in the valve seat to be in communication with a flow alarm and an accumulator alarm. The accumulator alarm includes a cavity with an opening above and a liquid level switch in the cavity. A drain valve is below the cavity.

Abstract: Methods and apparatus for enhancing reliability of, and monitoring the operation of airway valves to enhance patient safety. Pneumatic control line pressure (positive or negative) for actuation of the airway valve may be specified at a given magnitude or within a selected range and monitored continuously. Reduced or excessive pressure may be compensated by actuation of a pressure source or a bleed valve, and monitoring may be effected so as to warn the user of any deviation from the range, or deviations of selected magnitudes or frequencies or a combination thereof. The inspired volume of CO2 may be monitored using air flow and CO2 sensing, with detection of excessive CO2 volume triggering a warning. Similarly, measured end-tidal or end-inspired CO2 or other appropriate measures of CO2 concentration may be employed as a warning trigger. Other driving energy sources for airway valves, and monitoring thereof, are also disclosed.

Abstract: There is provided a valve enabling complete prevention of leakage and a backflow and having durability and less noise, and, further there may be implemented a valve capable of predicting the tendency of occurrence of damage on the functions of the valve before the functions of the valve are actually damaged. In a valve having a valve chamber 5 formed between a fluid inlet 2 and a fluid outlet 3, a valve element 6 disposed in the valve chamber 5 is composed of an elastic member and an inelastic member.

Abstract: A fluid delivery and control system is provided for a fluid delivery line having elastic components. The system includes a pressure sensor, an electronically controlled valve, processing circuitry, and computer program code logic. The pressure sensor is operative to detect fluid pressure within a fluid delivery line. The electronically controlled valve includes an adjustable flow regulating aperture disposed in the line, interposed along a linear flow axis, and operative to regulate fluid flow through the line. The processing circuitry communicates with the pressure sensor and the electronically controlled valve. The computer program code logic is executed by the processing circuitry and is configured to generate an output signal. The output signal comprises an operating parameter of at least one of the pressure sensor and the electronically controlled valve to adjust flow capacity of the flow regulating aperture of the valve to dissipate pressure oscillations within the fluid delivery line.

Abstract: A vapor purge system that permits evaluation of the system with a minimum number of hoses and connections, and without the use of additional components. The system includes a valve having first and second ports in communication with a first chamber and a third port in communication with a second chamber, the first and second chambers being defined by a metering member that divides an internal volume of a housing. A diagnostic member having first and second operative states is in communication with the first chamber through the second port. The first operative state prohibits communication with an exterior of the valve, and the second operative state permits communication with the exterior. The diagnostic member provides the ability to reliably measure flow through the valve. The system can use two (2) hoses including three (3) connections from a vapor supply port connected with the first port to the third port operatively connected with a manifold.

Abstract: In a pressure switch, which emits an electrical switching signal as a function of the magnitude of a pressure which is supplied to it, which electrical switching signal assumes a first value when the pressure is less than the threshold value and which assumes a second value when the value is greater than the threshold value, the threshold value is adjusted—assuming that this is provided at all—by hand, for example by moving a cam disk which is coupled to a rotary knob. In order to adjust the threshold value by means of an electrical signal, the pressure is supplied to a pressure sensor, which emits an electrical output signal, which is a measure of the pressure which is supplied to the pressure sensor. The pressure switch is supplied with an electrical input signal which is a measure of the threshold value.

Abstract: A flow controller for controlling a flow rate of a fluid flowing through a fluid passage comprises a control valve for which a degree of opening of a valve is adjusted by a control signal, an orifice arranged on an outflow side of the control valve, a combined sensor arranged on an inflow side of the orifice for almost simultaneously detecting a pressure and a temperature of the fluid, and a control circuit. The combined sensor includes a pressure-detecting element for deriving a detection signal corresponding to the pressure of the fluid, and a temperature-detecting element for deriving a detection signal corresponding to the temperature of the fluid. The pressure-detecting element and the temperature-detecting element are arranged closely to one another on an identical surface of a pressure-receiving section.

Abstract: A differential pressure based flow rate measurement device is provided which is coupled to surfaces of a blade 30 within a damper assembly 10, such as that provided within a variable air volume (VAV) box or within a liquid valve assembly. A blade 30 which includes a leading surface 32 opposite a trailing surface 34 is fitted with a sensing structure 50. The sensing structure 50 includes portions 52, 54 which extend away from the leading surface 32. Sensing holes 56 pass into a hollow interior of the sensing structure 50 and pass on to a pressure sensor 60. A similar sensing structure 50 is also provided extending from the trailing surface 34 which also has sensing holes 56 located therein. The sensing holes 56 coupled to the trailing surface 34 also lead to the pressure sensor 60 so that a differential pressure between the sensing holes 56 on either sides of the blade 30 can be measured.

Abstract: A visual signal of pressure between valve stem seals is given by a rising ring, which moves upwardly with the upper stem seal when there is pressure between the stem seals. The rising ring is held to the stem or valve body around the stem by a retaining ring. The rising ring, in its up position, precludes removal of the retaining ring.

Abstract: A pressure control apparatus which controls a pressure of air supplied from a supply hole of a base having a plurality of holes to a supply port of a valve having a plurality of ports is interposed between the base and the valve. This pressure control apparatus comprises a pressure control section which controls a pressure of the air such that the pressure becomes equal to a set pressure, a booster section which outputs a large amount of air to the valve by controlling an output pressure by air from this pressure control section, and a signal control section which outputs a monitor signal indicative of completion of pressure setting when the pressure of air output from the booster section becomes equal to the set pressure.

Abstract: A vapor canister and fuel tank assembly for a vehicle includes a fuel tank having an interior chamber and a vapor canister fluidly communicating with the interior chamber of the fuel tank to adsorb vapor fuel. The vapor canister and fuel tank assembly also includes a pressure sensor located on a clean side of the vapor canister to monitor pressure in the assembly.

Abstract: The present invention relates to a measuring instrument installation on a process circuit capable of being subjected to a medium under high pressure, with a locking element between the measuring instrument and the process circuit. According to the invention the locking element is a ball valve 18 provided with a valve body as the ball housing and with a process circuit connection 2 and a measuring instrument connection 3. In addition a ball 7 which can be rotated back and forth between a pass position 6 and a lock position is installed in the ball housing, said ball being provided with a passage bore 8 that can be positioned in the pass position. Furthermore two ball seats 12, 13 pointing respectively in the direction of the process circuit connection 2 and of the measuring instrument connection 3 are provided, each being provided with a sliding sleeve 14, 15 spring-loaded and capable of sliding in the direction of the ball 7.

Abstract: A back flow prevention valve for preventing water from draining back into a water supply line. The back flow prevention valve includes a housing comprising a tubular body having a first and second open end each having a respective covering thereon with an aperture extending therethrough. A water supply pipe is fluidly coupled to the aperture in a first covering. A cylinder is coupled to the first covering and extends inward of the tubular body. A piston having a bore extending therethrough is slidably positioned in the cylinder. A biasing member biases the piston toward the first covering. The aperture in the second covering has a ledge therein for opening the valve. A one-way valve is removably coupled to the piston and is adapted for letting water move outwardly through the piston toward the second end of the tubular member.

Abstract: Monitoring equipment comprising a part which defines a cavity, and input device to input fluid under pressure into the cavity. Mounting devices are provided on the part to enable an engine fuel injector valve or other fluid release device to be connected to the part and to release fluid from the cavity intermittently when the system is in use. Controls are connected to issue a triggering signal to the fluid release device to cause the latter to release fluid from the cavity. A pressure sensor is coupled to the cavity to provide a measure of the pressure within the cavity. The equipment further comprises pressure signal modifying device connected to receive signals from the pressure sensor and the controls and constructed to provide an output signal which is a measure of the pressure of fluid within the cavity at the time the controls issues such a triggering signal, while the effect of signals from the pressure sensor received by the modifying device on the output signal therefrom at other times is obviated.

Abstract: A valve coupler for delivering air into a propane tank for converting a propane tank to a portable pressurized air tank. The device includes a tubular member having a first end, a second end and a peripheral wall. The tubular member has an elongated hole extending therethrough. The tubular member has a first portion, a second portion and a middle portion. The first portion abuts the first end and defines a male coupler having a threaded outer surface. The hole in the second portion has a threaded inner wall and defines a female coupler. The peripheral wall of the middle portion has a first aperture therein extending into the hole. The first aperture is threaded. The male coupler may be coupled to a propane tank valve. A valve is removably positioned in and threadably coupled to the first aperture for delivering air into the propane tank.

Abstract: A liquid supply/drain conduit system that is equipped with an inner leakage detector and a liquid process tank that is equipped with such liquid supply/drain conduit system are disclosed. The liquid supply/drain conduit system includes a first conduit for feeding a liquid into an inlet of a first valve of the normal-closed type, a second conduit of T-shape that has a horizontal portion and a vertical portion, the horizontal portion of the second conduit flows a liquid from an outlet of the first valve into a reservoir tank. The second valve of the normal-open type has an inlet and an outlet, the inlet is situated in relation to the first valve in such a way that it receives through a vertical portion of the second conduit a leaked flow of liquid by gravity when the normal-closed first valve failed to close. A liquid detector is further provided for detecting a leaked flow of liquid through the second valve.

Abstract: A method of controlling occurrence of severe slugging in a riser (6) of a pipeline arrangement (2) comprising a riser base (8) and pipeline (4) conveying a multiphase fluid system in which the gas phase may be natural gas. The upper end of riser (6) is connected to a separator vessel (10) wherein the gas phase of the multiphase fluid system is separated from the liquid phase so that the separated gas leaves through gas outlet pipe (12) controlled by a valve (14), and the liquid leaves through an outlet pipe (16) controlled by valve (18). The valve (14) regulates the velocity of gas along the pipeline towards the riser.

Abstract: An integrated regulator and flow meter assembly having a piston reciprocatingly disposed in an opening of a body member, a support member disposed in the body member opening over the piston, and a flow tube coupled to the support member, wherein an aperture of the support member interconnects a flow conduit of the piston and the flow tube. A spring, preferably a wave spring or disc spring, biases the piston away from an orifice with a valve seat formed thereabout on an end portion of the body member opening. In one embodiment, the piston and a seating surface thereof are formed unitarily of a plastic material.

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: Programmable methods and apparatus for providing flow control in valves. In a preferred embodiment flow control occurs by pressing opposite sides of a very flexible tube section together to selectively, and programmably, closing and opening the flow pathway. Linear or rotary cam electrically motorized members provide valve function without requiring fluid flow through the valve. Alternatively, micro-fluidic amplifiers and fluidic logic circuits can be used to sense and control fluid pressure in a pre-calculated proportional flow regulation pattern. The invention can be used in medical, hospital, clinic and home-care units for bladder cycling a patient whose urinary tracts have an indwelling catheter, utilizing a pressure transducer that opens and closes the valve in accordance with preprogrammed pressure buildup or time intervals. Other uses include a medical infusion subsystem by regulating flow of fluid from a medication reservoir into the blood or into a digestive system.

Abstract: In a fixture for ascertaining pressure losses in a pressure line (3) which can be blocked for a selectable unit of time by means of shut-off valves (11, 13), in which the consumers (4, 5) are connected to the pressure line (3) and the pressure line (3) is provided with a pressure watchdog (15), the blocked pressure line (3) can have an adjustable quantity of the enclosed pressurised medium supplied into it via a branch line (24) for a unit of time, and the pressure watchdog (15) is provided with a circuit (31) by means of which the pressure line (3) can be controlled depending on the operating status of the pressure watchdog (15). By means of this embodiment, it is possible with only a very minor scope of circuitry to test the pressure line (3) at any time or at selectable time intervals and, depending on the measurement result, to resume the supply to the consumers (4, 5) or to deactivate the pressure line (3).

Abstract: A method of detecting abnormalities in flow rate in pressure-type flow controller. The method checks the flow rate for abnormalities while controlling the flow rate of fluid in a pressure-type flow controller FCS using an orifice—the pressure-type flow controller wherein with the upstream pressure P1 maintained about two or more times higher than the downstream pressure P2, the downstream flow rate QC is calculated by the equation QC=KP1 (K: constant) and wherein the control valve CV is controlled on the basis of the difference signal QY between the calculated flow rate QC and the set flow rate QS.

Abstract: A modular cooling system adapter for coupling to an orifice and applying pressure from a source of pressurized gas. The adapter includes a universal cooling orifice fitting for attaching the device to cooling system orifices of various sizes and configurations. The universal fitting preferably includes a plurality of steps having outer axially extending surfaces disposed at a slight negative angle to a plane parallel to the axial direction. The adapter may include a pressure adapter for coupling to a source of pressurized gas, such that the pressure adapter can be interchanged with other diagnostic tools including a valve assembly, a valve assembly incorporating a temperature probe and gauge and/or a pressure gauge. Additionally, the cooling system adapter is fully modular in that it allows quick disassembly for replacement of components and interchangeability of diagnostic tools.

Abstract: Apparatus for performing diagnostics through a regulator is disclosed. The pressure regulator is disposed in a fluid flow passage and has a throttling element moveable in the flow passage. A stem is attached to the throttling element. The apparatus includes a first pressure sensor for measuring pressure upstream of the throttling element, a second pressure sensor for measuring pressure downstream of the throttling element, and a travel sensor for detecting the position of the throttling element. A processor is provided which includes a stored algorithm for determining flow rate based on the measured pressure and travel values, and an alarm routine for generating logic alarms based on the measured operating parameters.

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: The present invention aims to provide a simply constructed pilot operated directional control valve having a position detecting function, capable of detecting, utilizing a light sensor, operating positions of a valve member such as a spool. To achieve this, an object to be detected 21 is formed on the end face adjacent to a breathing chamber 9, of a piston 2a; there is formed a recess 22 in which the object to be detected 21 is fit and which is disposed in the wall surface of the breathing chamber 9, in a casing 4; and an optical sensor 25 is mounted on a position facing the recess 22 in the casing 4 for projecting and receiving light relative to the object to be detected 21 through a through hole 23, whereby operating positions of the piston 12a, or the spool 6 are detected based on the light reflected from the object to be detected 21.

Abstract: A visual signal of pressure between valve stem seals is given by a rising ring, which moves upwardly with the upper stem seal when there is pressure between the stem seals. The rising ring is held to the stem or valve body around the stem by a retaining ring. The rising ring, in its up position, precludes removal of the retaining ring.

Abstract: A delivery device (2) for delivering fuel, having a delivery pump (3) and a fuel filter (7), has a bypass line (9) which is conducted past the fuel filter (7). When new, the delivery pump (3) delivers fuel through the fuel filter (7). After the fuel filter (7) has become clogged with dirt, the fuel is delivered by the bypass line (9) through a second fuel filter (10). By this means, pollution of the environment with fuel is kept particularly low.

Abstract: Cycling, self checking parameter sensing systems that continuously cycle such that the user of the monitoring system can determine not only if the vessel being monitored is above or below the desired parameter value, but also whether or not the monitoring system is functional. When the parameter being monitored is pressure, a system pressure chamber is attached to the vessel being monitored, and the pressure in this chamber is cycled to constantly test the function of the system components. The cycle is monitored for any irregularities.

Abstract: To provide a solenoid valve having a sensor in which monitor devices for monitoring whether input or output pressure in the solenoid valve is appropriate and a switching state of a valve body are collected to simplify the structure and to facilitate the assembling operation, thereby enhancing safety and reliability.

Abstract: A valve manifold having a manifold body with a first face, an opposed, substantially planar second face, and a peripheral wall, a first inlet, a second inlet, a first drain port, and a second drain port being formed in the first face, a first outlet and a second outlet being formed in the second face, there being a first, fluid communication pathway/valve for controlling fluid flow between the first outlet and the second outlet, a second, fluid communication pathway/valve for controlling fluid flow between the first inlet and the first outlet, a third, fluid communication pathway/valve for controlling fluid flow between said first drain port and said first outlet, a fourth, fluid communication pathway/valve for controlling fluid flow between the second inlet and the second outlet, a fifth, fluid communication pathway/valve for controlling fluid flow between the second drain port and the second outlet, flow paths opening into the outlets sloping away from said second face.