Abstract: A digital pressurization compound terminal 10 comprising a high accuracy digital pressure gauge 11 sheltered in a silicon housing, main body 13 made of a high-resistance allow and dimensioned to be held in the palm of the user's hand, o-ring 12, control or HP valves 14, ring 15, regulator assembly valve 16, equipped piston 17, second o-ring 18, inferior body and handle 19, third o-ring 20, male quick coupling 21, screw 22, regulator setting wheel 23, purging female quick coupling 24, service female quik coupling 25 and on-off switch 26.

Abstract: In a manifold valve, a part housing chamber and a fist recessed portion are provided to a casing of a selector valve, position sensors for detecting an operating position of a spool are housed in the part housing chamber, a first relay connector connected to both the position sensors and pilot valves is housed in the first recessed portion, a second recessed portion corresponding to the first recessed portion and a substrate housing chamber are provided to a manifold base, a second relay connector to be electrically connected to the first relay connector by mounting the selector valve onto a placing face is housed in the second recessed portion, and a main wiring substrate electrically connected to the second relay connector is housed in the substrate housing chamber.

Abstract: An air compressor assembly with one or more of the following features: a removable manifold assembly capable of being remotely located from the air compressor assembly for controlling and distributing compressed air from the air compressor assembly to one or more air powered tools, a lifting handle, a handle capable of assuming a plurality of positions, condensate removal devices, and a stable base and tie-down points.

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 test port and bleed valve is combined in a unitary main body of a device. A split core test plug is positioned within a hollow valve stem. The seal at the bottom of the valve stem engages a valve seat to provide a releasable airtight seal. At the top of the valve stem, rotating the stem so that it axially moves toward and away from the valve seat to open and close the valve to bleed gas from the vessel or piping system. A bleed port is located through the sidewall of the main body of the device so that it is in fluid communication with the working medium of the vessel or piping. The top of the stem includes a removable cap and retainer to cover an aperture in the top of the stem through which a test probe can be inserted.

Abstract: A shutoff valve includes a positive position indicator for indicating the position of a piston in the valve. The valve position indicator is operably connected to a piston within the valve so that movement of the piston causes a corresponding movement of the valve position indicator. The shutoff valve may also include one or more springs acting on the piston to close the valve. Each spring is independently capable of closing the valve.

Abstract: A system and method of managing fuel vapor pressure in a fuel system. The direction of air flow between first and second ports on either side of a chamber is controlled by a liquid that divides the chamber into first and second portions. A leak detection test, excess vacuum venting, and pressure blow-off of the fuel system are controlled by displacement of the liquid.

Abstract: A reel for storing an air hose includes a hollow housing having a spring biased pulley rotatably mounted therein. A pressured air inlet extends through the housing along the pulley axis of rotation and is sealed to a nozzle rotating with the pulley. The pulley stores an air hose having one end connected to the nozzle and an opposite end extending through an opening in the housing for attachment to a pneumatic tool.

Abstract: A fluid control valve includes an adjustable soft start capability and pressure indicator device. The fluid control valve isolates an input port and connects an outlet port to an exhaust port when the fluid control valve is in its closed position. A system is provided for locking the fluid control valve in the closed position. The indicator device is used to provide an indication of the pressure within the outlet port to ensure safe operation.

Abstract: An over-pressure protection system having a conduit section extending between a pressure reduction valve and a low-pressure fluid handling system, a shut-off valve provided with an actuator arranged in the conduit section, pressure sensors arranged one on either side of the shut-off valve in the conduit section, a safety control system that communicates with the actuator and the pressure sensors which produces a signal when it detects a high pressure in the conduit section, and a self-diagnostic system for checking the shut-off valve and the pressure sensors that communicates with the actuator, the pressure sensors and the safety control system, which self-diagnostic system produces a signal when it detects a failure in either the shut-off valve or the pressure sensors or both.

Abstract: A shut off valve for use with a concrete delivery hose includes a single flexible cylindrical sleeve disposed within a one piece, continuous rigid casing that surrounds the hose. A gas chamber is defined between the sleeve and the casing so that when pressurized gas is forced into the chamber, the sleeve will be displaced radially inwardly to constrict the hose and stop the flow of concrete. The shut-off valve also includes a relief valve for quickly exhausting gas from the valve, and an off/on indicator for indicating open/closed positions of the valve.

Abstract: A variable function voting solenoid-operated valve apparatus is provided having both high safety availability and high plant reliability that does not require a plant system to be bypassed during testing. Also provided is a variable function voting solenoid-operated valve apparatus wherein initiation of a safety action will occur only if each of a pair of operatively associated solenoid-operated valves in the apparatus are actuated, and wherein either of the solenoid valves can singly default to a pre-designated safety action without inadvertently actuating the process valve and isolating or venting the process fluid. Also provided is a variable function voting solenoid-operated valve apparatus wherein either a “1 out of 1 with hot stand-by” operational mode or a “2 out of 2 with high diagnostics” operational mode may be selected by an operator using a logic control system depending on the technical requirements of a given plant environment.

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 fluid flow control valve is provided with means for detecting and quantifying valve seat leakage when the valve is in its closed position. Any fluid leaking past the seat flows through an orifice of known, fixed dimensions present downstream of the seat when the valve is in its closed position. Pressure transducers measure a first pressure immediately upstream of the seat, a second pressure between the seat and the orifice, and a third pressure immediately downstream of the orifice. The second and third pressures are used to calculate flow through the orifice, and the calculated flow is used with the first and second pressures to determine the size of a leak path across the seat.

Abstract: A sensor for detecting contact of a fluid delivery probe with a fluid surface and for detecting fluid flow through the probe includes a first electrode disposed along a fluid flow path of the probe upstream from a distal tip of the probe and a second electrode longitudinally spaced and electrically isolated from the first electrode and disposed at the distal tip of the probe. An oscillating signal is transmitted through the first electrode, and at least a portion of the signal is received through the second electrode. Through changes in the received signal due to the distal tip of the probe coming into contact with a fluid surface or due to fluid flow through the conduit between the first and second electrodes, fluid surface contact and fluid flow can be detected. A pressure sensor can be employed to monitor internal fluid pressure within the fluid conduit of the fluid delivery probe as a secondary, redundant mechanism for detecting fluid flow through the conduit.

Abstract: A device for controlling fluid flow between an evaporative emission space of a fuel tank and a fuel vapor collection canister that includes a housing, a valve, a seal, an electric actuator, an electric transducer, and an electrical connector. The housing includes a first port, a second port, and a fluid flow path that extends between the first and second ports. The first port is adapted for receiving fluid flow from the evaporative emission space and is at a first pressure level. The second port is adapted for supplying fluid flow to the fuel vapor collection canister and is at a second pressure level. The valve is movable along an axis with respect to the housing between a first configuration, a second configuration, and an intermediate configuration between the first and second configurations. The first configuration permits substantially unrestricted fluid flow between the first and second ports. The second configuration prevents fluid flow between the first and second ports.

Abstract: A system and method for monitoring a pressure relief device are provided. The system includes a release sensor that provides an indication when the pressure relief device activates. A wireless transmitter is connected to the release sensor and sends a wireless transmission having an activation signal when the indication is provided by the release sensor. A receiver receives the wireless transmission from the transmitter and generates a warning when the activation signal is identified.

Abstract: The present invention provides a pneumatic yoke for a pressurized gas reservoir. The yoke comprises an aperture for receiving a stem of the pressurized gas reservoir, the stem having a stem valve selectively operable to permit a flow of pressurized gas through an opening of the stem; a gas passage for alignment with the opening of the stem to accept the flow of pressurized gas; a gas diverting conduit in fluid communication with the gas passage; a movable clamping member within the gas diverting conduit, the movable clamping member having a surface forming a boundary of the conduit, the boundary displaceable by a flow of gas into the conduit to thereby vary the volume of the conduit to thereby engage the clamping member with the stem; and, a release valve in fluid communication with the gas diverting conduit, the release valve selectively operable to permit a flow of gas from the conduit to permit disengagement of the movable clamping member with the stem.

Abstract: A circuit balancing valve includes a valve body having fluid flow passage extending therethrough. The fluid flow passage includes a fluid inlet passage-side in fluid communication with a supply line, and a fluid flow outlet passage-side in fluid communication with an outfeed line. A valve seat is provided in the valve body between the inlet and outlet flow passages, and a sealing member is selectively movable in the operation of the valve towards or away from the valve seat to restrict or permit fluid to flow from the inlet passage-side to the outlet passage-side. Fin members are disposed in the outlet passage. The fin members are provided as an axially elongated rib, with a radial spacing from each other of between about 45° and 135°. The inlet flow passage includes an enlarged diameter cylindrical section and a reduced diameter cylindrical section.

Abstract: An air pressure and flow regulating valve for pneumatic tool mainly includes a valve body, a pressure regulator and a flow regulator connected to one side and a top, respectively, of the valve body, and an air inlet connector provided at a bottom of the valve body. By rotating a first turning knob provided on the pressure regulator, a narrow passage is produced in the valve body between the air inlet connector and the flow regulator, so that a pressure of air supplied into the pneumatic tool via the flow regulator is controllable via the size of the narrow passage. By rotating a second turning knob mounted around the flow regulator to fully open, partially shield, or fully close an outer air passage hole provided on the flow regulator, speed and flow of air supplied into the pneumatic tool can be changed under control.

Abstract: The invention relates to a carbon dioxide fire extinguishing device comprising a capacitive measuring device (11) which is calibrated for a temperature range above and below the critical temperature of carbon dioxide and which is used to detect the amount of gas loss from a carbon dioxide pressure tank (10). The carbon dioxide fire extinguishing device comprises an outlet valve in which the capacitive measuring probe (12) is integrated in such an advantageous way that the outflow resistance of the extinguishing gas is hardly increased at all.

Abstract: An apparatus for dosing lubricant into a compressed air flow includes a lubricant container, a pneumatically operated lubricant pump, an injection channel, a non-return valve interposed between the outlet of the pump and the injection channel, and an electronic sensor cooperating with or coupled to the non-return valve so that the sensor emits an electrical signal responsive and corresponding to the stroke travel of the non-return valve. When the pump carries out a lubricant injection cycle, the pressurized lubricant pushes open the non-return valve, flows into the injection channel and from there into a main channel through which compressed air flows. The travel of the valve is sensed by the sensor, and the sensor signal indicates whether the lubricant injection was proper or faulty, e.g. if the proper amount of lubricant was injected.

Abstract: A fluid flow damper for use within a duct includes a first blade having a wing section and a base section. The damper also includes a second blade having a wing section and a base section engaged with the base section of said first blade. A first passage is defined by the base section of the first blade with one or more ports providing fluid communication between the passage and a fluid upstream of the damper within the duct in order to measure the velocity pressure plus static pressure within the duct. Additionally, a second passage is defined by the base section of the second blade with one or more ports providing fluid communication between the passage and a fluid downstream of the damper within the duct in order to measure the static pressure within the duct.

Abstract: A sump for inhibiting leakage of liquid includes a double wall for at least part of the sump, and an interstitial space between the double wall. An indicator liquid is located in the space, and a sensor is in fluid communication with the space such that a change in the pressure or liquid level in the interstitial space causes the sensor to indicate leakage into or from the interstitial space. The double wall includes a base, a wall directed upwardly from the base of the sump, and the upwardly directed wall includes an angular portion being directed at an angle from the base greater than 90 degrees relative to the base. A remote location of that portion is connected with a substantially upright wall portion for the sump. An aperture for an electrical conduit is located in the angular portion.

Abstract: The invention relates to a cock that is used to control the flow of a pressurised fluid, in particular a medical or industrial gas. The inventive cock consists of: a body (1) with an internal fluid distribution circuit (3, 31, 32) comprising an internal fluid passage which fluidically connects a fluid inlet (31) with a fluid outlet (32); means for controlling the fluid flow (4) that can be used to enable or prevent the circulation of fluid in said passage (3); and handling means which are provided with a pivoting lever that is actuated manually by an operator and which co-operate, directly or indirectly, with the fluid flow control means (4). The pin lever (2) (YY) pivots around a pivot point (XX) and can move between at least three stable positions which are angularly staggered in relation to each other. In the rest position, said lever (2) is fixed and solidly connected to the body (1) of the cock and there is zero fluid flow in the internal passage.

Abstract: In a system for controlling a brake valve, the supply voltage available for controlling the electromagnet of the brake valve is continually measured during operation and the effective value of the voltage present at the coil of the electromagnet is varied by varying the duty factor of the pulse times according to the supply voltage supplied at the time.

Abstract: An apparatus and method of operating a fuel vapor pressure management apparatus that includes a housing and a pressure operable device. The housing defines an interior chamber and includes first and second ports that communicate with the interior chamber. The pressure operable device separates the interior chamber into a first portion in fluid communication with the first port and a second portion in fluid communication with a second port. The pressure operable device includes a poppet movable along an axis and a seal adapted to cooperatively engage the poppet. A first arrangement of the pressure operable device occurs when there is a first negative pressure level at the first port relative to the second port, and the seal is in a first deformed configuration. A second arrangement of the pressure operable device permits a first fluid flow from the second port to the first port when the seal is in a second deformed configuration.

Abstract: A rotary blower with forced external air cooling having multiple interconnected and synchronized parallel multi-lobe rotors with the same number of straight lobes for propelling flow from a suction port to a discharge port of an inner casing without internal compression. The blower also has an outer cover with cooling air inlet and outlet openings and added centrifugal cooling fans mounted on the rotor shafts adjacent to the cooling air inlet openings for circulating cooling air through the space between the outer cover and the inner casing. The blower further utilizes wearable strip seal devices applied on the rotors for preventing internal leakage and accidental mechanical contact.

Abstract: A system, apparatus, and method of forming a hydraulic control valve system is provided. The system may include a hydraulic control valve, a removable mounting module, and a mounting assembly. The hydraulic control valve may have a valve body, the body having a function port, a supply port to allow for the supply of fluid to the function port, and a vent port to allow fluid to vent from the function port. The control valve may also have a gate assembly, the gate assembly having a gate, a seal assembly, and a roller bearings assembly. The seal assembly may include a seal carrier slidably mounted within the gate and a shear seal, to selectively direct hydraulic pressure to and from the subsea function. The hydraulic control valve may also include an actuation assembly for slidably moving the seal assembly, and a female coupling assembly integral with the hydraulic control valve body.

Abstract: The electronic-hydraulic transmission control module has a hydraulic plate, an electronic control unit, and a sensor. The sensor is caulked into a wall of an opening in the hydraulic plate forming a plastic deformation.

Abstract: An apparatus for manually opening a normally-closed valve includes a value and a hand-operated valve opening jig. The valve includes a working rod for operating a valve element which is moved to close and open a conduit; a cylindrical holder fixed to the working rod, and to which the hand-operated valve opening jig can be detachably attached from the outside of the housing; a biasing member which biases the working rod to close the conduit; and a pressure chamber which is supplied with a working fluid to move the working rod to make the valve element open the conduit. The hand-operated valve opening jig includes a manual-opening attachment which can be detachably attached to the cylindrical holder; and an operational member which is operated to move the working rod in a direction to make the valve element open the conduit via said manual-opening attachment.

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 fluid control valve includes an adjustable soft start capability and pressure indicator device. The fluid control valve isolates an input port and connects an outlet port to an exhaust port when the fluid control valve is in its closed position. A system is provided for locking the fluid control valve in the closed position. The indicator device is used to provide an indication of the pressure within the outlet port to ensure safe operation.

Abstract: An automated condensate drain system for gas flow elements is provided that includes a differential pressure transmitter, a sequence controller, and two condensate chambers for receiving and collecting accumulated moisture from air flow elements and transmitters. The condensate chambers are placed in low profile positions within the instrument piping system, requiring downward sloping of the instrument tubing to accentuate condensation drainage. The sequence controller initiates a drainage cycle (set as desired by operator), permitting the transmitter to enter an auto-zero cycle, thereby energizing an internal isolation valve in the transmitter while maintaining the transmitter output. The sequence controller energizes solenoid valves of the two condensate chambers, wherein the chambers open to permit drainage of accumulated moisture assisted by static pressure system.

Abstract: The present invention relates to a pressure control valve, in particular for electrohydraulic brake systems, including a valve member arranged in a valve housing and a sensor element for determining the fluid pressure that prevails in the valve housing. The fluid pressure in the valve housing is indirectly determined by the sensor element by way of the deformation of the valve housing.

Abstract: An interlock valve is formed by incorporating a main valve portion having a valve member into a first casing, incorporating a driving-side operating portion 2 having a driving piston for driving the valve member into a first end plate, incorporating a return-side operating portion having a return spring for returning the valve member into a second end plate, incorporating an OR circuit portion formed to output control fluid to the driving piston by a plurality of shuttle valves, a plurality of OR input ports, and one OR output port into a second casing, and sandwiching the first casing and the second casing between the first end plate and the second end plate positioned to face each other to couple the end plates and the casings.

Abstract: The present invention pertains to methods and apparatus for controlling the pressure in a supercritical processing system. Active methods for controlling the pressure include anticipating a pressure deviation due to a solute addition to a system, and changing the pressure within the system to compensate for the deviation. In this way, a desired pressure is achieved when the solute is added, without phase separation of the solute from the solvent. Pressure is adjusted by changing the volume of the supercritical processing system. Passive methods include adjusting the pressure of a supercritical system by changing the volume in response to a pressure deviation from a desired pressure. Apparatus for controlling the pressure in a supercritical processing system are described.

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: A programmable circuit detects drop in pressure of a supplied pressurized gas below a predetermined threshold pressure and automatically switches to a different supply of pressurized gas and automatically contacts a remotely located host computer. The circuit sends status data to the host computer and enters a server mode in which the circuit performs commands issued by the host computer. The commands include commands to change data of the programmable circuit and to download new programming. The predetermined threshold pressure is established by manually setting the supplied pressurized gas to a desired pressure and causing the programmable circuit to measure the pressure of supplied gas and to store the measured pressure as the threshold pressure.

Abstract: An air pressure and flow regulating valve for pneumatic tool mainly includes a valve body, a pressure regulator and a flow regulator connected to one side and a top, respectively, of the valve body, and an air inlet connector provided at a bottom of the valve body. By rotating a first turning knob provided on the pressure regulator, a narrow passage is produced in the valve body between the air inlet connector and the flow regulator, so that a pressure of air supplied into the pneumatic tool via the flow regulator is controllable via the size of the narrow passage. By rotating a second turning knob mounted around the flow regulator to fully open, partially shield, or fully close an outer air passage hole provided on the flow regulator, speed and flow of air supplied into the pneumatic tool can be changed under control.

Abstract: A vacuum pressure regulator system for use in association with a vacuum system in which a vacuum is employed for healthcare purposes, for assisting in monitoring and regulating the vacuum pressure, and having a manual pressure control valve to adjust the treatment vacuum pressure supplied to the patient, a vacuum pressure sensor to sense the treatment vacuum pressure for the patient in the system, and producing a treatment vacuum pressure signal, a sampling circuit which intermittently samples the pressure signal generated by the pressure sensor and generate sampling signals, an electrically powered pressure display circuit, and digital pressure display, for receiving the sampling signals and providing a visible display, and, a non-mains power supply.

Abstract: A fluid flow control valve is provided with means for detecting and quantifying valve seat leakage when the valve is in its closed position. Any fluid leaking past the seat flows through an orifice of known, fixed dimensions present downstream of the seat when the valve is in its closed position. Pressure transducers measure a first pressure immediately upstream of the seat, a second pressure between the seat and the orifice, and a third pressure immediately downstream of the orifice. The second and third pressures are used to calculate flow through the orifice, and the calculated flow is used with the first and second pressures to determine the size of a leak path across the seat.

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 gas leakage detection system includes a flow path, a dual mode valve disposed in the flow path, an ultrasonic measuring section including a pair of ultrasonic transducers, disposed in the flow path upstream from the dual mode valve, a flow rate calculation section for computing a flow rate based on a signal from the ultrasonic measuring section, and a control section for controlling the dual mode valve. The control section closes or opens the dual mode valve instantaneously, and the flow rate calculation section computes a flow rate when the dual mode valve is closed. Thus, gas leakage can be decided substantially without stopping a gas flow when a user is using the gas.

Abstract: A gas manifold that provides an uninterrupted supply of gas and automatically switches between at least two gas sources. This gas manifold couples to a on-line gas source and a reserve gas source. A pressure transducer at the inlet to the manifold reads the pressure of the gas source. A downstream pressure regulator of each pressure transducer regulates the pressure of gas supplied to a control valve directed by a control circuit. This control circuit monitors the pressure read by the pressure transducers to determine which gas source will be placed on service depending on user preferences, and directs the operation of the control valve to effect those choices.

Abstract: A pressure regulator having a valve cartridge adapted to be removably held within its housing, said cartridge having a frame carrying and positioning a valve seat, a valve member, a valve stem, and a spring. The valve cartridge ensures correct spacing between the valve member and the valve seat. Difficulties in pressure regulation may be quickly rectified and pressure flow characteristics may be altered by removing and replacing the valve cartridge. Another aspect of the invention discloses a multiple pressure regulator comprising: a housing adapted to removably house two valve cartridges; an inlet opening into the housing; an outlet opening from the housing; and two valve cartridges adapted to be removably held within the housing. Each of said cartridges similar to those described above.

Abstract: A gas delivery system for propane or natural gas includes a gas service line, a pressure regulator connected in the gas service line, and a flow control valve device permanently installed at a predetermined location in the gas service line, e.g., upstream of the regulator or downstream of a gas meter in the case of a natural gas system. The flow control valve device includes a valve body incorporating an integral pressure tap for enabling a measurement of gas pressure at the predetermined locations. The valve device also includes a valve operator having an open position in which flow takes place through the valve device and a closed position in which flow through the valve device is blocked and a locking mechanism with a specialized key issued only to service personnel for selectively locking the valve operator in the open and closed positions.

Abstract: A system for monitoring a structure includes cavities on an outer surface and a fluid source at substantially constant pressure coupled to the cavities through high fluid impedances to create pressure differentials therebetween. A telemetry system has pressure differential switches across each of the high impedances for monitoring differential pressure changes across the impedances and providing a signal indicative of the location of the cavity associated with the high impedance across which the change is monitored. A fluid capacitance is associated with each cavity and the corresponding impedances to facilitate a transient fluid flow through the impedances.

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.