118 results about "Pressure decrease" patented technology

The disclosure relates to a leak detection system for a pneumatic braking system of a vehicle. The pneumatic braking system has a control unit, a pneumatic circuit, and an air tank configured to supply pneumatic pressure to the pneumatic circuit. The pneumatic circuit has a plurality of valves configured to be individually controlled by the control unit. The link detection system includes program code configured, when executed by a processor, to individually control the valves of the pneumatic circuit so as to isolate a sub-circuit of the pneumatic circuit. The leak detection module is configured to monitor a pressure in the pneumatic circuit for leaks, wherein the leak detection module detects a leak in the sub-circuit if the pressure decreases while the sub-circuit is isolated.

An air pressure management device includes: a temperature conversion air pressure calculation unit that calculates a temperature conversion air pressure based on acquired temperature and air pressure of a tire; an air pressure decrease rate calculation unit that calculates an air pressure decrease rate from a change in the temperature conversion air pressure for a predetermined period, the rate indicating a declining trend of the air pressure; an air pressure decrease rate threshold value setting unit that sets an air pressure decrease rate threshold value corresponding to an acquired thermal history amount using a threshold value table, the threshold value table specifying the air pressure decrease rate threshold value associated with the thermal history amount regarding the tire; and a first determination unit that determines whether the air pressure is abnormal based on the calculated air pressure decrease rate and the set air pressure decrease rate threshold value.

The invention relates to the technical field of nozzle flow detection equipment, and discloses water mist nozzle flow test equipment, which comprises a tank body, the top end of the tank body is in threaded connection with an end cover, the interior of the end cover is movably connected with a hollow connecting rod, and the bottom end of the hollow connecting rod is fixedly provided with a water mist nozzle to be tested. A piston is fixedly installed at the bottom of the outer surface of the hollow connecting rod, and a pressure relief device is fixedly installed on one side of the top end of the piston. According to the water mist nozzle flow test equipment provided by the invention, the piston is arranged, when water gathered at the bottom of the inner cavity of the tank body is gradually increased, the pressure of the inner cavity is gradually increased, and a first through hole can be forced to move upwards and compress a second elastic piece; and the first through hole and the second through hole are communicated so as to perform pressure relief operation on the bottom of the inner cavity of the tank body and reduce the pressure of the inner cavity of the tank body, so that the pressure of the bottom of the inner cavity of the tank body can be always kept in a relatively constant range.

The pressure relief assembly comprises a supporting plate, supporting frames are fixedly installed at the top end of the supporting plate, a pressure relief pipe is arranged between the supporting frames, an input hole and an output hole are formed in the two sides of the pressure relief pipe respectively, the inner wall of the pressure relief pipe is rotationally connected with a rotating shaft, and the inner wall of the rotating shaft is rotationally connected with the pressure relief pipe. The rotating shaft is sleeved with a rotating cylinder, two baffles are fixedly installed at the top end and the bottom end of the rotating cylinder, and the two baffles are slidably connected with the inner wall of the pressure relief pipe. After pressure relief is completed, internal air pressure and external air pressure are balanced, at the moment, under the action of the torsion spring, the rotating shaft is rapidly reset, the baffle is reset to be in a vertical state, and when the internal air pressure is reduced and external air pushes the baffle through the output pipe, under the action of the stop block at the bottom end, the baffle cannot rotate, and the backflow phenomenon cannot occur; and under the elastic action of the torsional spring, the baffle can be reset rapidly, and the backflow phenomenon is avoided.

Pressure relief structure for a double-layer battery, characterized in that it comprises: an upper cell module (1) provided with a plurality of upper cell pressure relief openings (11); a lower cell module (2) provided with a plurality of lower cell pressure relief openings (21); a pressure relief layer (3) clamped between the upper cell module (1) and the lower cell module (2), wherein a pressure relief chamber (33) communicating with the plurality of upper cell pressure relief openings (11) and the plurality of lower cell pressure relief openings (21) is formed within the pressure relief layer (3), and the plurality of upper cell pressure relief openings (11) and the plurality of lower cell pressure relief openings (21) are offset in their position.

A grapple hydraulic cylinder may comprise a barrel body, a piston-rod assembly, a cap operably connected to the barrel body, and a pressure relief system. The pressure relief system may be operably connected to a rod side chamber and a cap side chamber. The pressure relief system may comprise a first valve and a second valve. The second valve may be a relief valve configured to open upon the cap side chamber reaching a determined pressure and moving hydraulic fluid from the cap side chamber to the rod side chamber while the first valve simultaneously maintains the locked position. Pressure in the cap side chamber is reduced, and pressure in the rod side chamber increases. A similar configuration may be utilized to move hydraulic fluid from the rod side chamber to the cap side chamber to reduce pressure in the rod side chamber.

A valve device for a self-propelled work machine (1) having hydraulic consumers (47, 50), the valve device comprising at least one direction control valve (30, 31, 55, 64) connected to the pressure lines (P1, P2, 56, 65) and the work lines (A1, A2, 52, 54) of the hydraulic consumers (47, 50); a hydraulic control line (C, 58, 63) designed to move at least one direction control valve (30, 31, 55, 64) to a first position; a pilot valve (32, 59) connected to the hydraulic control line (C, 58, 63); a pressure supply line (Pa, 66); and a pressure reduction line (T, 62), the pilot valve (32, 59) being designed to selectively connect the hydraulic control line (C, 58, 63) to the pressure supply line (Pa, 66) and the pressure reduction line (T, 62).

The application is a gradually expanding high-pressure hydrogen pressure reducing valve, comprising: a first valve body with an air inlet; a second valve body fixed on the top of the first valve body, with a pressure reducing cavity between the first valve body and the second valve body; an air outlet on the second valve body; a guide in the pressure reducing cavity; a valve core through the guide; a first elastic member with a spring seat between the bottom of the valve core; an adjusting mechanism on the top of the second valve body, suitable for adjusting the limit stroke of the valve core; a plurality of pressure reducing channels on the surface of the valve core; the pressure reducing channels comprise N pressure reducing grooves connected in a head-to-tail manner, the two connected pressure reducing grooves are arranged in an inclined manner, the first pressure reducing groove to the Nth pressure reducing groove, and the width and depth of the pressure reducing grooves gradually increase; the pressure reducing channels are used for reducing the pressure of hydrogen, and the pressure of high-pressure hydrogen can be reduced to the use range by using a one-stage pressure reducing structure, the structure is simple and compact, small in size, light in weight, and good in reliability.

The invention relates to a method for controlling a tank system (100). The tank system (100) has a plurality of tanks (12) and a line system (39). Each tank (12) is provided with a valve (13) and a temperature sensor (16). The tank system supplies at least one load (40) with a fluid. The method has the following steps: a) detecting a missing expected pressure decrease by means of the line system (39) when all of the valves (13) of all of the tanks (12) of the plurality of tanks are closed, b) detecting the temperature in each tank (12) over a defined period of time, and c) ascertaining a temperature curve for each tank (12) on the basis of the detected temperature and opening all of the valves (13) of all of the tanks (12) on the basis of the ascertained temperature curves. During steps a) and b), the at least one load is supplied from at least one tank (12.1) which remains open.

A manufacturing apparatus includes a chamber, a pressure reducing device, and a return pipe. The pressure reducing device is configured to reduce the pressure in the chamber. The return pipe includes a first opening, a conduit, and a second opening. The first opening and the second opening are respectively and independently open to the interior of the chamber. The first opening is connected to an exterior body. The conduit connects the first opening and the second opening. The conduit is configured to once draw gas in the exterior body out of the chamber when the pressure in the chamber is reduced, and return the drawn gas into the chamber.

The invention relates to a method for operating a power generation device (1) having a charge air compressor (7), in which-a charge air pressure downstream of the charge air compressor (7) is detected and a test is carried out with respect to a pressure drop, in which-at least one further operating parameter of the power generation device (1) that is dependent on the charge air pressure is detected, wherein-at least one further operating parameter is evaluated with respect to the plausibility of a pumping event, which is a cause of a pressure drop in the charge air pressure, and detecting a pumping event of the charge air compressor (7) if the detected decrease in the charge air pressure is detected and the pumping event as a cause of the pressure decrease in the charge air pressure is assessed as trustworthy on the basis of the assessment of the at least one further operating parameter.

The utility model relates to a pressure reducing valve device with a waterproof function, which comprises a valve body, an oxygen bottle connector is arranged at the opening end of the valve body, a connecting part is arranged between the oxygen bottle connector and the valve body, and the valve body and the oxygen bottle connector are fixedly connected through the connecting part. When the pressure of oxygen in an external oxygen bottle is reduced, the pressure in the oxygen bottle connector is reduced, at the moment, the spring pushes the valve element to move towards the oxygen bottle connector, the bottom end of the air hole is driven to move synchronously, and when the bottom end of the air hole moves to be communicated with the alarm pipeline, the water-proof sealing structure is closed. Therefore, gas can be discharged into the alarm pipeline through the air hole, penetrates through the one-way valve and then is discharged from the bottom end of the alarm pipeline, bubbles are formed underwater, a user is reminded of insufficient oxygen pressure, and the problem that the underwater welding quality can be seriously affected due to the fact that the oxygen pressure is insufficient and a welding rod cannot be fully combusted is avoided as much as possible.

This technology provides a way to determine the state of air control valves and flow paths used in vehicle brakes without requiring any special operation. [Solution] The state determination device 100 is a state determination device 100 that determines the state of at least one of an air control valve and a flow path used in a vehicle brake, and the air control valve includes an acquisition unit 110 that discharges air at an output pressure corresponding to the input pressure, which is the pressure of the introduced air, into a supply flow path to the brake cylinder, acquires first measured values ​​of the input pressure and output pressure at one or more timings during the pressure-increasing period when the input pressure increases, and acquires second measured values ​​of the input pressure and output pressure at one or more timings during the pressure-reducing period when the input pressure decreases, a calculation unit 120 that calculates the difference between at least one of the input pressure and output pressure during the pressure-increasing period and the pressure-reducing period based on the first measured value and the second measured value, and a determination unit that determines the state of at least one of the air control valve and the flow path according to the difference.

The utility model provides fatigue test equipment, which belongs to the technical field of carrier rockets and comprises a storage tank, a pneumatic system and a water replenishing system. The pneumatic system communicates with the gas inlet and outlet through the proportional valve; the water replenishing system communicates with the liquid inlet and outlet; when the fatigue test equipment is used, liquid in the storage tank is pushed by the pneumatic system to enter the storage tank test piece, the fatigue test is carried out on the storage tank test piece under the action of the pneumatic system, the principle that water is pushed by air is adopted, and the fatigue test equipment is not influenced by the service life of a pressure reducing valve and a back pressure valve; the pressing precision, the pressure increasing rate and the pressure reducing rate can be better controlled in 20,000 times of pressure cycle fatigue tests; in the pneumatic system, the proportional valve is communicated with the storage tank, and the proportional valve has the characteristics of stepless adjustment of pressure and speed, low service power, less heat and low noise, so that impact fluctuation during reversing of a conventional switch type pneumatic control valve can be avoided, and pressure control is more direct and accurate.

To improve the environmental performance of a Wankel-type internal combustion engine and improve rotation performance.SOLUTION: A rotational force is obtained by using pressure when combustion pressure is maximum, so that the combustion pressure can be received as strongly as possible in a desired direction. The pressure decreases as a combustion chamber volume increases, and the pressure decreases as a temperature decreases. Thus, in a Wankel-type internal combustion engine, a large area of a plane for receiving the combustion pressure in a normal rotation direction is achieved, and other faces are served as faces concentric about a rotor center which do not hinder the rotation. When the vicinity of an apex of a face facing a reverse rotation direction which hinders the rotation is hidden behind a rotor housing, a value of receiving the combustion pressure in the normal rotation direction becomes maximum, at which ignition is performed. Since fuel injection timing is set slightly before the ignition for the purpose of not generating HC, there is no time for mixing as a mixed gas, which allows a combustion under the presence of spots. Also, since the fuel is injected in a small volume, the ignition is facilitated even under a significant lean state.SELECTED DRAWING: Figure 1

The invention relates to a pressure maintaining experiment method and system for detecting leakage of a soot blowing system. The method comprises the following steps that S1, a soot blowing steam electric isolation door, an inlet door and a drainage door are opened; s2, the system control valve pressure is set to be a first preset pressure value, drainage operation is carried out, and a first time period is timed; s3, after timing is finished, the control valve pressure of the system is reduced to a second preset pressure value, and after a second time period is delayed, the water blowing and draining valve is closed; s4, closing the isolation door, completely closing the override of the control valve of the system, carrying out a pressure maintaining test, and timing for a third time period; s5, monitoring the pressure change in the system in real time, and determining the final pressure value of the system; s6, judging the state of the system according to the pressure change data in the system; when the final pressure value is larger than the preset pressure threshold value, the system does not leak; if the final pressure value is reduced to 0, the system breaks down. Compared with the prior art, the method has the advantages of timely detection, high reliability and the like.

A method for determining properties of hydraulic fractures from measurements of pressure in a well made after stopping pumping fracturing fluid into the well (shut in) includes determining a first time after shut in whereinafter a decrease in measured pressure is caused by fluid leak off in a fracture. A second time after shut in is determined whereinafter the decrease in pressure is caused by fluid leak off, fracture growth and fluid pressure equilibration in the fracture. A third time after shut in is determined whereinafter the decrease in pressure is caused by fluid leak off, fracture growth, fluid pressure equilibration in the fracture and pressure drop in a near wellbore zone. Values of fluid efficiency, minimum stress and net pressure which are determined result in a calculated pressure with respect to time matching the pressure measurements within a predetermined threshold.

An alert system for use with a subsea infrastructure is presented. The alert system 400 includes a pressure detection apparatus 410 connectable to the subsea infrastructure 405; a signalling device; and a release mechanism 420 operable between a locked state in which the signalling device is attached to the alert system, and an unlocked state in which the signalling device is released from the alert system. The alert system 400 releases the signalling device upon detection of a pressure variation at a point of interest on the subsea infrastructure above a first threshold value when the pressure variation is due to an increase in pressure, or below a second threshold value when the pressure variation is due to a decrease in pressure. Also presented is a method of monitoring a subsea infrastructure using the alert system.

The present invention provides a decompression electric explosion valve, comprising: a housing assembly, a piston, a retaining ring, a decompression pipeline device, and an igniter. The piston is installed inside the housing assembly, and the piston tail is fixed by a retaining ring to prevent the piston and the housing assembly from moving relative to each other. The igniter is installed at the tail end of the housing assembly. The housing assembly comprises: a housing and a diaphragm. During operation, the igniter pushes the piston to break through the diaphragm, allowing the fluid to enter the interior of the housing. The decompression pipeline device comprises: a steel ball, a spring, a fixing frame, a connecting rod, a baffle, and a decompression housing. When the fluid pushes the steel ball at a certain pressure, the steel ball and the baffle are linked, so that a part of the fluid passes through the steel ball and the baffle into the inner cavity of the decompression pipeline housing. The greater the fluid flow rate, the smaller the amount of fluid entering, the output pressure decreases, and the decompression effect is achieved; when the fluid flow rate slows down, the amount of fluid increases, the output pressure increases, and the pressure control effect is achieved. The present invention has the characteristics of simple structure, good economy, small size, light weight, etc.

An interface bonding failure test method, system, storage medium and program product, relate to the field of testing or analyzing materials by means of determining chemical or physical properties of materials, in the method, the interface bonding state between the pole piece coating and the current collector is evaluated by performing a single loading and unloading cycle. In the loading stage, a first resistance value is measured when the pressure reaches a preset target detection pressure, and then the pressure is continuously increased to a preset peak pressure (the pressure is greater than the target detection pressure but less than the yield strength of the current collector). In the unloading stage, a second resistance value is measured when the pressure decreases back to the preset target detection pressure. By comparing the difference between the two resistance values with a preset hysteresis threshold, the interface bonding state is determined: if the difference is greater than the threshold, it is determined that there is interface bonding failure. The present application is used to reduce the difficulty of identifying overpressure risk and defining the best roll pressure process window.

A device for supplying respiratory gas, which has a respiratory gas supply driven by an electric motor and a motor control system comprising at least one sensor for detecting a measured value, wherein the motor control system (14) has a control characteristic for reducing a current target speed of the electric motor (13) as a function of the measurement signal of the sensor when a predeterminable limit value of an operating parameter is exceeded, characterized in that the motor control system (14) has a control characteristic for reducing the speed as a function of the measured value while simultaneously maintaining a limit value for a further operating parameter, wherein the control characteristic is designed to maintain a minimum value for a ventilation pressure, wherein the motor control system (14) is designed to evaluate at least one detected breathing event,wherein the motor control regulates the mean pressure level in the time range of a user's expiration to at least 2 hPa by means of a control device, and wherein the pressure level in the time range of an expiration is variable independently of a user's specification, and wherein a user can specify the extent of the change in the pressure level for the time range of an expiration, wherein the breathing events are oral expiration and leakage, and wherein, upon automatic detection of these events, the pressure control takes into account those metrological parameters which are evaluated by the control in a normal state for a pressure increase or a pressure decrease and which can no longer be reliably evaluated when these events occur, for the duration of the occurrence of these events,that the operating mode reducing noise and / or energy consumption and / or respiratory effort is activated, with a pressure reduction occurring upon detection of these events.

A leak control system (26) for an evacuation system (12) of an insufflation system (1), for controlling leakage of insufflating gas from a vessel (5) of a subject being insufflated. An evacuation conduit (20) connects a Venturi vacuum creating device (14) to the vessel (5) through a pressure relief valve (27) operable from a closed state to an open state in response to a pressure drop across the pressure relief valve (27) in the direction of the arrow A exceeding a predefined pressure drop value. The vacuum creating device (14) is operable in response to a signal from a pressure sensor (10) detecting pressure in the cavity (5) exceeding a predefined pressure value for applying a vacuum to the evacuating conduit (20) to increase the pressure drop across the pressure relief valve (27) to the predefined pressure drop value, for in turn operating the pressure relief valve (27) into the open state. On the pressure in the vessel (5) being reduced below the predefined pressure value, the vacuum creating device (14) is deactivated, and the pressure relief valve (27) transitions into the closed state, thereby preventing further leakage of insufflating gas though the Venturi vacuum creating device (14).

The invention provides a steady-flow multistage pressure reducing valve, and relates to the technical field of pressure reducing valves, the steady-flow multistage pressure reducing valve comprises a multistage curved pipeline system, the multistage curved pipeline system is composed of annularly distributed inlets and outlets, each stage of curved pipeline is communicated in a valve body, and the inlets and the outlets are distributed at intervals; a bend at the tail end of the main runner and the inner wall of the branch runner form a reverse impact structure which is used for reducing fluid pressure; according to a fixed type design without movable parts, pressure adjustment is achieved through the hydrodynamic principle, mechanical driving elements are not needed, geometrical parameters of the curved pipeline include that the ratio of the main runner length (# imgabs0 #) to the branch runner length (# imgabs1 #) is 2: 1 to 5: 1, and fluid pressure can be greatly adjusted while fluid circulation is kept. The fluid energy loss in the pressure reducing process is reduced, and the pressure reducing accuracy of the pressure reducing valve is improved. The number of movable parts of equipment is small, mechanical abrasion and maintenance requirements are reduced, and the reliability and durability of the valve are improved.

The invention discloses a full-premixing gas water heating equipment control method and device, equipment and a medium. When the current rotating speed of a fan reaches the maximum rotating speed of the fan and flame ion flow is smaller than or equal to a current threshold value, the pressure difference between the air pressure of a premixer and the gas pressure of the premixer is reduced, and a corrected pressure difference value is obtained; the opening degree of the gas proportional valve is adjusted, so that the pressure difference value between the air pressure and the gas pressure is equal to the corrected pressure difference value, and due to the fact that the corrected pressure difference value is smaller than the pressure difference value obtained through calculation based on the current rotating speed of the draught fan, when the air pressure is reduced, the pressure difference value is also reduced, and the gas pressure needing to be reduced is reduced; the reduction range of the opening degree of the gas proportional valve is reduced, the problem that smoke exceeds the standard or flames out due to excessive reduction of the opening degree of the gas proportional valve is avoided, and the environment-friendly performance and the operation stability of the full-premixing gas water heating equipment are improved.

A partition wall for dividing an aircraft cabin into individual sections, having at least one opaque air passage for enabling a pressure reduction between the sections through the partition wall. The wall also includes a frame and at least one stress-free planar element which is inserted into the frame. The at least one air passage is formed by a structure, a suspension in the frame, or both.

The invention relates to a method for controlling the valve (60) of a pressure relief valve (50) of a fluid device (10) of a vehicle, comprising the steps of providing (62) the pressure relief valve (50), which is configured to trigger a pressure reduction of the fluid in at least one fluid branch (42, 44) of the fluid device (10) when the valve is in the open position, the pressure reduction of which depends on an opening time of the pressure relief valve (50), and performing (64) a pressure reduction process (66) to reduce the fluid pressure (p) in the fluid branch, with a first pressure reduction step (68) comprising opening (70) the pressure relief valve (50) with a predetermined first opening time (t1), wherein during the pressure reduction process (66) and subsequently after the first pressure reduction step (68), the fluid pressure (p) in the fluid branch (42) reduced by the pressure reduction of the first pressure reduction step (68) is detected (72). 44),A comparison (76) of the detected fluid pressure (p) with a target fluid pressure (ps) and a specification (78) of a second opening time (80) to be applied for a subsequent second pressure reduction step (80) when the pressure relief valve (50) is opened, depending on the comparison (76), are performed. The invention further relates to a method for pressure reduction (84), a pressure relief valve (50), and a fluid device (10).

The invention relates to the technical field of check valves, and discloses a check hydraulic valve which comprises a valve body. A water inlet and a water outlet are formed in the left side and the right side of the valve body correspondingly, a positioning groove is formed in the valve body, a valve element is slidably connected to the interior of the valve body, a positioning strip is fixedly connected to the exterior of the valve element, the positioning strip is slidably connected with the positioning groove, a weight reduction groove and a through groove are formed in the upper portion and the lower portion of the valve element correspondingly, and a pressure relief mechanism is arranged in the through groove. When the pressure rises, the pressure relief channel is automatically opened; after the pressure is reduced, the valve can automatically reset to close a channel, so that stable operation of a system is ensured, the automation degree and stability of the system are greatly improved, serious accidents such as pipeline breakage and equipment damage caused by too high pressure in the valve body are effectively avoided, and reliable guarantee is provided for safe and stable operation of the whole water conservancy system; the safety risk and the maintenance cost are reduced, and the reliability and the service life of the valve body are improved.

The utility model relates to the technical field of clamps, in particular to a pressure reduction clamp. Comprising two clamp bodies, fixing parts which can be fixedly connected through a fixing mechanism are fixedly installed at the two ends of each clamp body, and sealing rings are installed on the inner sides of the clamp bodies. A pressure reducing plate is fixedly installed on the inner side of the sealing ring, and a pressure reducing hole is formed in the middle of the pressure reducing plate. By means of the structure, when liquid in the pipeline flows through the pressure reducing holes, a channel becomes smaller, so that the flow is reduced when the liquid flows into the middle transition pipeline, the pressure in the transition pipeline is reduced, then the liquid flows into the pipeline with the small pipe diameter from the transition pipeline, the pressure in the pipeline with the small pipe diameter is reduced, and the pressure in the pipeline with the small pipe diameter is reduced. And the overall stability of the pipeline is improved.

The invention relates to a circular truncated cone bearing arrangement having a circular truncated cone bearing (10), in which a clamping device (33) acts on a shaft disk (30) such that a tangential torque acting on the circular truncated cone bearing (10) can be compensated by a tangential resistance torque. For this purpose, a pressure medium can be introduced via a channel (43) and a conveying device (39) into a chamber (37) surrounded by the ring (35), said chamber having a membrane (31) with a surface (31a). The surface (31a) of the diaphragm (31) has a high coefficient of friction and can be in contact with the radial surface (30a) of the hub (30) by reducing the pressure in the chamber (37). The diaphragm (31) can be returned to its original shape again by means of a pressure reduction or an additional component such as a return spring (41).