85results about "Fluid pressure measurement using pistons" patented technology

A height adjustable hitch receiver is disclosed and described.

Embodiments of air admittance valve assembly and piping system incorporating the same are provided herein. In some embodiments, a valve assembly comprising a housing, a first valve comprising a first valve sealing member and a first valve seat, and a second valve comprising a second valve sealing member and a second valve seat, and a pipe, an inlet, an outlet, a first zone, a second zone, a third zone, the first and second valve sealing member is closed by gravity and open based upon the pressure differential between the first zone, second zone and third zone.

The invention belongs to the technical field of industrial measurement, and particularly relates to a force measuring device and method based on light refractive index, the device comprises a closed air pressure piston, the closed air pressure piston is filled with a gas medium, and the two sides, close to the lower end face, of the closed air pressure piston are each provided with a light transmitting window; one of the light-transmitting windows is provided with an optical fiber collimator, the optical fiber collimator is connected with a laser through an optical fiber, and the other light-transmitting window is provided with a receiving unit which is used for receiving an optical signal penetrating through the closed air pressure piston, converting the optical signal into an electric signal and transmitting the electric signal into a computer. According to the invention, the stress is reflected through the change of the refractive index of the gas medium, so that the defect that the resistance value of the resistor is greatly influenced by different temperatures is overcome, and the error of the stress sensor for measuring the distance by the optical fiber caused by the displacement of the measuring optical fiber due to physical factors such as shaking of the measuring unit or the mounting base or metal fatigue is avoided.

A safety device coupled to a fluid end such that the safety device is in fluid communication with at least one of a suction chamber and a discharge chamber of the fluid end. The safety device has an outer housing and a visual indicator. The visual indicator is moveable between a first position where the visual indicator is retracted into the outer housing, and a second position where the visual indicator is extended out of the outer housing.

The invention relates to the field of instruments and meters, and particularly discloses a measurement method for verification and calibration work of a digital piston type pressure gauge system, the system comprises a piston system, a force value sensing assembly, a positioning system, a pressure medium circulating system, a pressure output system and a control unit, and the core adopts a high-precision force value sensor to replace a traditional weight. Point contact force value transmission is achieved through a conduction steel ball, a piston motor is matched to drive a rotating disc to be linked with a rotating contact, stable rotation of a piston rod is ensured, and a medium oil film is formed. The control unit receives signals of the sensor and the piston position indicator and automatically completes pressure adjustment, data acquisition and error calculation. The force value transmission precision reaches 0.0005%, multi-range and multi-instrument measurement requirements can be met through a multi-stage piston structure and a multi-pressure-measuring-port design, full-process automation is achieved, and in addition, accurate output of all pressure points in the measurement range can be achieved by means of the wide-range sensing capacity of the high-precision force value sensor and the fine adjusting function of the pressure adjusting unit.

The utility model belongs to the field of teaching experiments, and provides an experimental device for measuring atmospheric pressure, which comprises a cylinder body and a piston, the piston is arranged in the cylinder body in an air-tight seal manner, one end of the cylinder body is fixedly connected with a force-measuring tension spring connecting device, and a force-measuring tension spring is connected between the force-measuring tension spring connecting device and the piston; a vent hole is also formed in the end of the cylinder body; the other end of the cylinder body is fixedly connected with a manual switch valve, scale marks are arranged on the cylinder body between the piston and the manual switch valve, and an atmospheric pressure value and an atmospheric pressure value are correspondingly marked on the upper side and the lower side of the scale marks. When the device is used for an experiment, the manual switch valve is opened, the hose is connected with the air extractor, the air extractor is used for extracting air in the barrel body, and the manual switch valve is closed, so that the atmospheric pressure value and the corresponding atmospheric pressure can be directly read through the scale marks; according to the utility model, the force application object for force measurement is changed from human to atmosphere, students can intuitively understand the experiment process, static reading is adopted, the reading is accurate, and the experiment process is intuitive.

Indicator (8) for indicating the occurrence of a pressurized fluid leak in a vent chamber (28, 37) of a pressurized fluid apparatus (1), the indicator comprising a support tube (80) having a connection opening (81) fluidically connected to the vent chamber of the pressurized fluid apparatus, and an external opening (82) opening to an exterior (24). The indicator includes a sight (90) movable within the support tube (80) between an initial position and a signaling position under the effect of an overpressure occurring at the connection opening, the sight (90) being positioned further from the connection opening (81) in the signaling position than in the initial position, to indicate the occurrence of the pressurized fluid leak in the vent chamber when the sight is in the signaling position.

The differential pressure sensing apparatus has a housing enclosing three chambers and a piston which slides within the housing chambers where two fluids cause movement of the piston corresponding to a differential pressure between the locations. The piston includes a first cylindrical section 202 coupled between two second cylindrical sections of lesser diameter 204, and having first and second annular surfaces 512A&B joining the first and the two second sections. A third annular surface 510 at the opposite end of one of the second cylindrical sections has a surface area equal to that of the first and second annular surfaces. The housing had first and second chambers (302, 306 in figure 3) to apply first and second fluid pressures to the first and second annular surfaces and a third chamber (310 in figure 3) in which the third annular surface applies pressure to a fluid based on the difference between the first and second fluid pressures. A method of operating the apparatus is also disclosed.

To provide an abnormal pressure display device that operates normally over an extended period of time.SOLUTION: An abnormal pressure display device 1 comprises: a flow path penetration part 2 that branches from a main flow path U51 through which fluid passes and leads to the outside; a piston part 3 that is disposed within the flow path penetration part 2 and provided to be movable in the axial direction; a biasing part 4 that generates biasing force to keep the piston part 3 at a fixed position in the axial direction in equilibrium with a normal pressure when the interior of the main flow path is at the set normal pressure; and a fixing part 5 that is attachable and detachable to / from the piston part 3 and keeps the piston part 3 immovable at the fixed position in the axial direction when attached.SELECTED DRAWING: Figure 2

The differential pressure sensing apparatus has a housing enclosing three chambers and a piston which slides within the housing chambers where two fluids cause movement of the piston corresponding to a differential pressure between the locations. The piston includes a first cylindrical section 202 coupled between two second cylindrical sections of lesser diameter 204, and having first and second annular surfaces 512A&B joining the first and the two second sections. A third annular surface 510 at the opposite end of one of the second cylindrical sections has a surface area equal to that of the first and second annular surfaces. The housing had first and second chambers (302, 306 in figure 3) to apply first and second fluid pressures to the first and second annular surfaces and a third chamber (310 in figure 3) in which the third annular surface applies pressure to a fluid based on the difference between the first and second fluid pressures. A method of operating the apparatus is also disclosed.

The invention relates to the technical field of physical quantity precision measurement, in particular to a piston effective area measurement system and method. The system comprises an optical pressure measuring device and a piston pressure gauge pressure measuring device. The optical pressure measuring device comprises a box body, a measuring cavity, a reference cavity and a laser refractometer. The measuring cavity is used for filling a gas medium; the reference cavity maintains a vacuum state; the laser refractometer emits laser to the measuring cavity and the reference cavity. The piston pressure gauge pressure measuring device comprises a piston pressure gauge which comprises an air cylinder and a piston. The piston divides the cylinder into a first space and a second space. The gas source is communicated with the second space and the measuring cavity through the three-way valve, the refractive index of gas in the measuring cavity is obtained through the laser refractometer, and the pressure of the gas is determined through the refractive index of the gas. Calibration of the effective area of the piston is traced to basic physical constants and high-precision measured physical quantities, the pressure is accurately measured, and high precision and reliability of a calibration result are guaranteed.

A syringe pump is disclosed that includes a pressure sensor assembly, a plunger, first and second pressure sensors, and a processor. The pressure sensor assembly senses a force and includes the plunger having a sensing surface configured to receive the force, the first pressure sensor operatively coupled to the plunger and configured to estimate the force applied to the sensing surface, and the second pressure sensor operatively coupled to the plunger and configured to estimate the force applied to the sensing surface. The processor is coupled to the first and second pressure sensors to estimate a magnitude of the force.

Differential pressure sensors, control, and associated methods are disclosed. An example apparatus includes a first housing including a first port, the first port fluidly coupled to a first location, first fluid to flow into the first port from the first location, a second housing coupled to the first housing, the second housing including a second port, the second port fluidly coupled to a second location, second fluid to flow into the second port from the second location, and a piston slidably disposed between the first and second housings, the first and second fluids to cause movement of the piston, the movement of the piston corresponding to a differential pressure between the first and second locations.

The invention relates to a gas piston type pressure vacuum gauge, and belongs to the field of pressure metering, the gas piston type pressure vacuum gauge comprises a support frame, a piston sleeve and a piston system, the upper end of the support frame is provided with a positioning hole vertically penetrating through the support frame, the piston system comprises a piston cylinder with two open ends and a piston arranged in the piston cylinder, and one end of the piston is coaxially connected with a piston connecting rod; the piston sleeve is filled with the piston cylinder, one end of the piston cylinder is in sealing contact with a sealing piece arranged on the inner wall of one end of the piston sleeve, an air pipe connector is arranged in the middle of one end of the piston sleeve, the sealing piece is provided with a hole channel communicated with the air pipe connector and an inner cavity of the piston cylinder, the piston sleeve is vertically arranged in the positioning hole, and the air pipe connector is connected with negative-pressure or positive-pressure equipment through a pipeline. And a counterweight loading piece is detachably arranged on the piston connecting rod. The device has the advantages that the condition that the whole piston is in a horizontal state during measurement can be provided, it is ensured that the piston can be kept in a vertical state during use so as to achieve the purpose of reducing measurement errors, and the overall structural design is more stable and reasonable.

The present invention relates to a hydraulic bearing device and a force sensor, wherein the force sensor comprises a first piston and a second piston, wherein the first piston and the second piston have piston guide sections with the same diameter, wherein a movable cylinder is provided on the piston guide sections of the first piston and the second piston, and wherein the sealing guide movable sleeve is provided on the movable cylinder relative to the first piston and the second piston and axially moving along the piston guide section, wherein a force sensor is provided in series on the transmission path between the driving mechanism and the movable cylinder, wherein the first piston, the second piston and the movable cylinder form a hydraulic cavity, and wherein the force sensor further comprises a pressure sensor connected to the hydraulic cavity. The present invention solves the technical problem in the prior art that the measurement result is unstable due to the static friction between the piston and the cylinder body.

A hydropower station water delivery system safety detection device disclosed by the present invention comprises a water delivery pipe body, a connecting flange pipe and a pressure detection mechanism, the two ends of the water delivery pipe body are both fixedly communicated with the connecting flange pipe, and the water delivery pipe body and the connecting flange pipe are both provided with clamping arm frames. The ends, close to each other, of the two connecting flange pipes fixedly communicate with a mounting pipe, a protective shell is mounted on the surface of the mounting pipe, and the pressure detection mechanism is arranged on the surface of the mounting pipe and located in the protective shell. Through the arrangement of the pressure detection mechanism, the pressure in the water delivery pipe is detected, and meanwhile, the strain measurement rod is used for measuring the deformation of the pipeline, so that the pressure of the pipeline in the water delivery system of the whole hydropower station is effectively and conveniently detected, operated and used. Through the arrangement of the mounting mechanism, quick assembly and disassembly, reliable locking and effective sealing of the connecting part of the water delivery pipeline of the hydropower station are realized.

Differential pressure sensors, control, and associated methods are disclosed. An example apparatus includes a piston including a first cylindrical section having a first diameter and first and second annular surfaces, each of the first and second annular surfaces having a first surface area, and second cylindrical sections having a second diameter less than the first diameter, the first cylindrical section between the second cylindrical sections, and a housing including a first chamber to receive a first fluid, the first fluid to apply a first pressure on the first annular surface, a second chamber to receive a second fluid, the second fluid to apply a second pressure on the second annular surface, and a third chamber including a third fluid, the third annular surface to apply a third pressure on the third fluid, the third pressure corresponding to a difference between the first pressure and the second pressure.

The invention relates to the technical field of high-pressure piston pressure gauges, in particular to a piston position dynamic comparison measuring device of a high-pressure piston pressure gauge, which comprises a base, a measuring frame is fixedly connected to the rear side of the top of the base, a measuring rod is arranged on the front side of the measuring frame, and a track fixing pipe is arranged on one side, away from the measuring rod, of the front side of the measuring frame. By arranging the measuring frame, the measuring rod, the scale marker post and the graduated scale, accurate dynamic comparison measurement of the piston position of the high-pressure piston pressure gauge is achieved, specifically, limiting of the measuring sliding rod is manually relieved, and the measuring accuracy is improved. The measuring sliding rod clamping groove slides into a measuring point on the inner wall of the measuring rod outer rod to press the piston, then the measuring sliding rod is limited, the high-pressure piston pressure gauge is started, the dynamic pressure change of the piston is measured, the cylindrical sliding rod drives the scale mark connecting block to slide on the inner wall of the sliding groove, and the scale mark block displays the dynamic pressure change of the piston.

A measurement method of a three dimensional molding device, the three dimensional molding device including the first pressure measurement step of measuring the pressure of the pressure generating section 500 as first pressure data; a second pressure measurement step of measuring, by the measurement section 240, a pressure generated by the pressure generating section 500 biasing the plunger pin as second pressure data; and a third pressure measurement step of measuring a difference between the first pressure data and the second pressure data.

The invention relates to a high-precision liquid chromatograph mobile phase pressure measuring device, which effectively solves the problem of large error of the liquid chromatograph mobile phase pressure measuring device. According to the technical scheme, the liquid chromatograph comprises a step-shaped shell, a piston-like body is arranged in the shell, a sealing ring is arranged on the inner side of a step surface, the left end of the piston-like body is in contact with the sealing ring, a mobile phase of the liquid chromatograph flows through a first cavity, and a second cavity is filled with a liquid medium with constant pressure. The piston-like body is always pushed and pressed to the position in contact with the supporting bolt through large pressure in the second cavity, so that the position of the piston-like body is kept constant, the compression amount of the sealing ring is kept constant, and the sealing effect of the piston-like body is improved while the two cavities are sealed and isolated. Interference variables such as friction damping or deformation damping which are not easy to measure cannot be generated in the axial direction of the piston-like body, so that the pressure of the mobile phase can be calculated more accurately.

A metal vapor pressure detection device and detection method includes a metal vapor pressure detection mechanism (3) arranged outside the metal vapor pressure detection chamber (1); the metal vapor pressure detection mechanism (3) includes a displacement generation system and a displacement detection system arranged in the displacement generation system; the displacement generation system includes a displacement slider sleeve (5), a displacement slider (4) arranged in the displacement slider sleeve (5), and a pressure balance spring (6) connected to the displacement slider (4). In the metal vapor pressure detection device, the metal vapor pressure can be directly obtained, providing a basis for the online control and adjustment of the metal vapor pressure.

Embodiments of air admittance valve assembly and piping system incorporating the same are provided herein. In some embodiments, a valve assembly comprising a housing, a first valve comprising a first valve sealing member and a first valve seat, and a second valve comprising a second valve sealing member and a second valve seat, and a pipe, an inlet, an outlet, a first zone, a second zone, a third zone, the first and second valve sealing member is closed by gravity and open based upon the pressure differential between the first zone, second zone and third zone.

Pressure gauge, comprising a shell (10) comprising a front end plate (11) which is transparent, a rear end plate (12), an inner surface and a ventilation hole (121) formed through the rear end plate (12), a piston base (13) arranged on the inner surface of the rear end plate (12) and having a guide recess (131) formed in a top surface of the piston base (13) and perpendicular to the rear end plate (12), and a position of the guide recess (131) corresponds to a position of the vent hole (121), a scale plate (20) arranged between the front end plate (11) of the shell (10) and the rear end plate (12) of the shell (10), an index pointer (30) arranged on a front surface of the scale plate (20), a piston set (40) arranged in the piston base (13) of the shell (10) and having a plug (41) arranged in the guide recess (131) of the piston base (13), which is movable between the rear end plate (12) of the shell (10) and the scale plate (20) and has a surrounding wall, a front end section, a rear end section and a rack portion (411) formed on the peripheral wall of the plug (41), and teeth of the rack portion (411) are arranged along a movement direction of the plug (41), a piston ring (42) arranged around the plug (41) and disposed between the rear end portion and the rack portion (411) of the plug (41) and adjacent to a wall of the guide recess (131) in an airtight manner, and an elastic element (43) arranged between the plug (41) and the scale plate (20) and having two ends, each adjacent to the plug (41) and the scale plate (20), and a gear transmission set (50) arranged between the rear end plate (12) of the shell (10) and the scale plate (20), connected to the plug (41), arranged through the scale plate (20) and connected to the index pointer (30).

The utility model discloses an SF6 pressure detection device, belongs to the technical field of electrical equipment detection, is applied to an SF6 conveying pipe, and aims to solve the technical problem that in the prior art, SF6 pressure detection lacks an automatic low-pressure and high-pressure protection function. The SF6 pressure detection device comprises a pressure gauge installed on an SF6 conveying pipe. The pressure detection pipe is arranged on the SF6 conveying pipe and is communicated with the SF6 conveying pipe; the piston is arranged in the pressure detection tube, a spring is arranged between the piston and the top of the pressure detection tube, a pressure relief hole is formed in the middle of the piston, a plugging film is arranged in the pressure relief hole, a pricking needle capable of puncturing the plugging film is arranged at the top of the pressure detection tube, and a hollow plate is fixed at the bottom in the pressure detection tube. And a pressure sensor is mounted at the top of the hollow plate. The SF6 pressure detection device not only realizes the detection of SF6 pressure, but also has the functions of pressure relief protection and low-pressure sealing, and is beneficial to keeping the SF6 pressure stable.

The invention discloses a piston isolation type glass micro-melting pressure sensor for a high-pressure, high-viscosity and high-temperature medium, and relates to the field of pressure measurement, and the piston isolation type glass micro-melting pressure sensor is characterized in that a circuit unit is fixedly connected with a core shell, and the core shell is connected with an equipment pipeline through a thread; the glass micro-melting pressure sensing unit is arranged in the circuit unit, the edge is fixed at the top of the core shell, and the center is connected with the piston rod pressure sensing end; the edge of the isolation diaphragm is welded with the bottom of the core shell to form a sealing cavity, and the center is welded with the tested end of the piston rod. And the circuit unit is electrically connected with the pressure sensing unit and is connected to an upper computer. During measurement, the rigid piston rod transmits medium pressure to the pressure sensing unit, so that the pressure sensing unit deforms to cause resistance change, and the circuit unit reads and uploads a resistance value. Piston type mechanical transmission is used as a front-end isolation and force transmission mechanism, the pressure of an extreme medium is directly transmitted to the rear-end high-pressure and high-temperature-resistant glass micro-melting pressure sensing unit without lag, and the accuracy and reliability of medium pressure measurement under the extreme working condition are improved.

Embodiments of air admittance valve assembly and piping system incorporating the same are provided herein. In some embodiments, a valve assembly comprising a housing, a first valve comprising a first valve sealing member and a first valve seat, and a second valve comprising a second valve sealing member and a second valve seat, and a pipe, an inlet, an outlet, a first zone, a second zone, a third zone, the first and second valve sealing member is closed by gravity and open based upon the pressure differential between the first zone, second zone and third zone.

This invention discloses a method for monitoring the superstatic water pressure of delamination water based on the principle of communicating vessels, belonging to the field of delamination water hazard prevention and control. It solves the problems of asynchronous water filling and difficulty in exhausting gas from the delamination and hydraulic cavities during the filling process. The invention mainly consists of a delamination cavity, a hydraulic cavity, a screw-piston pressurization device, a delamination cavity exhaust pipe, a hydraulic cavity exhaust pipe, a dual-cavity connecting pipe, a rotatable platform, and a base. Before filling, the delamination cavity and hydraulic cavity are erected on the rotatable platform, with the delamination cavity exhaust pipe and hydraulic cavity exhaust pipe above and the dual-cavity connecting pipe below, thus forming a communicating vessel between the delamination cavity, the dual-cavity connecting pipe, and the hydraulic cavity. During water filling, based on the principle of communicating vessels, the delamination cavity and hydraulic cavity can be simultaneously filled and vented. After filling, the hydraulic cavity is pressurized by the screw-piston pressurization device to generate and monitor superstatic water pressure, providing a feasible technical solution for the synchronous filling and venting of the delamination and hydraulic cavities and the pressurization of the hydraulic cavity.