18 results about "Decreased pressure" patented technology

The invention relates to the technical field of oil production engineering, in particular to a staged fracturing pump stopping test oil well packer and a control system thereof.The staged fracturing pump stopping test oil well packer comprises a central pipe, the upper end and the lower end of the central pipe are connected with an upper connector and a lower connector respectively, a rubber barrel is arranged on the periphery of the central pipe, and a thin groove is formed in the position, corresponding to the rubber barrel, of the central pipe; a traditional through hole is replaced by the thin groove, high-pressure fluid in the rubber sleeve can only be slowly decompressed through the thin groove after a pump is stopped, it is ensured that the rubber sleeve is kept in an expansion sealing state in a testing period, intersection fluid channeling is avoided, and pressure drop data of a well mouth and a well bottom truly reflects the characteristics of cracks and stratums; meanwhile, after the test is finished and the pressure of the high-pressure fluid in the central pipe is reduced to a certain value, the internal and external pressure difference of the first through hole pushes the piston to move upwards so as to open the second through hole, the fluid in the rubber sleeve can be rapidly discharged through the second through hole, the rubber sleeve rapidly shrinks and resets, the deblocking time is greatly shortened, and the single well fracturing operation efficiency is improved.

The utility model discloses a double-end diaphragm valve which comprises a valve body, two valve element assemblies and a valve element driving assembly, the number of the valve element assemblies is two, and the two valve element assemblies are symmetrically arranged along the central axis in the length direction of the valve body. The valve element driving assembly is configured to drive the valve element assembly to open or close the first valve port and / or the second valve port. By arranging the two symmetrical valve element assemblies and matching with the valve body provided with the main fluid channel, the flow dividing channel, the first branch channel and the second branch channel, pressure dividing of conveyed fluid is achieved, the pressure of the fluid to a valve port is reduced to half of the original pressure, and the applicable fluid pressure upper limit of the valve body is greatly improved; and meanwhile, a double-path independent fluid control function can be realized.

The utility model relates to the technical field of leveling, and discloses an automatic leveling hydraulic device which is characterized in that pressure balance and abrasion reduction are realized through structures such as a supporting disc, a bearing disc and a 3-RPS parallel mechanism, a small hydraulic cylinder is started according to angle inclination of the ground, the small hydraulic cylinder pushes a ball head through an output shaft, and the ball head is automatically leveled. One side, pushed by the 3-RPS parallel mechanisms, of the supporting disc is inclined, the extending length of each 3-RPS parallel mechanism is adjusted, the bottom face of the supporting disc makes complete contact with the ground, friction force maximization is achieved, the multiple 3-RPS parallel mechanisms are arranged to be used for reducing pressure of a single connecting column, meanwhile, the position of the supporting disc is fixed through ejection of a ball head, and therefore the supporting disc can be fixed. And the position deviation of the supporting disc in actual use is avoided, the more accurate leveling effect is achieved, and the effects of balancing pressure and reducing loss are achieved.

To prevent a force with which a positioning part of a fixing device is pressed against a positioning surface of a fixing housing from being reduced when a nip pressure is reduced SOLUTION: A fixing device 80 includes a first fixing member (heating roller 81), a second fixing member (pressure roller 82), an arm 84, a spring 85, a cam 86, an input gear, and a positioning part. The arm 84 can press the second fixing member toward the first fixing member. The spring 85 biases the arm. The cam 86 applies the first nip pressure at the first phase and applies the second nip pressure at the second phase. The positioning portion positions the fixing housing with respect to the main housing. When rotating the input gear, the drive gear presses the input gear so that the positioning portion is pressed against the positioning surface. The friction mechanism MM applies a greater frictional resistance to the heating roller 81 when the arm 84 is in the second position than when the arm 84 is in the first position.SELECTED DRAWING: Figure 4

The invention relates to a device (100) for monitoring the particle load of a gas or gas mixture compressed to a predetermined first pressure, the device comprising a discharge line (102) which is designed and intended to forward the gas or gas mixture provided at the predetermined first pressure by a compressor (104), which is not part of the monitoring device (100), to a consumption point (106) which is also not part of the monitoring device (100). According to the invention, the monitoring device (100) also comprises: a branch line (108) which is connected to the discharge line (102) and is designed and intended to branch off part of the compressed gas or gas mixture; a pressure reducer (110) which is designed and intended to reduce the pressure of the gas or gas mixture to a second pressure; and a particle measuring device (112) which is connected to a section (108a) of the branch line (108) arranged downstream of the pressure reducer (110).

A pressure reduction device e.g. for gas mains, and having a slam shut valve, has a valve with a valve disc 336, actuator assembly 330, 332, 334 and a valve seat 312, high pressure chamber (100a, fig

The invention relates to a negative pressure unit for a welding system, comprising a negative pressure chamber and a negative pressure pump which is designed to pump chamber gas out of the negative pressure chamber during operation in order to reduce the chamber pressure in the negative pressure chamber below the ambient pressure around the negative pressure chamber, and the negative pressure unit comprises a controllable ventilation valve with different opening degrees according to control. The invention also relates to a welding system having a negative pressure unit. The invention also relates to a method for operating a negative pressure unit, to an additional method for generating a feature map for reading a first vent valve opening by a target chamber pressure of a negative pressure unit, to an additional method for generating a feature map for reading a negative pressure pump closing pressure by a target chamber pressure, and an additional method of activating a negative pressure cell.

The cycle comprises isochoric heating of working fluid in a cylinder (1), during which a displacer (3) and a piston (2) move synchronously in same direction, whereby the pressure and temperature of working fluid located between them increase, without a change in volume, due to heat received from a regenerator (4). This is followed by isothermal expansion of working fluid, during which the displacer (3) remains stationary while the piston (2) continues moving in same direction, and the pressure of working fluid located between them decreases, whereas its volume increases, without a change in temperature. Subsequently, isobaric cooling of working fluid is carried out, during which the displacer (3) remains stationary and the piston (2) moves toward the displacer. Under constant-pressure conditions, the volume and temperature of working fluid located between them decrease as a result of heat transfer to the regenerator (4). Simultaneously, cooled working fluid flows through a valve (5) into accumulator receiver. Finally, fresh portion of working fluid is drawn from accumulator receiver, during which the piston (2) remains stationary while the displacer (3) moves in opposite direction. After completion of suction process, the cycle is repeated.

To provide a compression system that reduces the gas pressure in a gas pipe and lowers the temperature of the gas being pumped to other gas pipes without improving the cooling capacity of the cooling device. [Solution] The compression system according to this embodiment comprises a compressor, a cooling device, and a control unit. The intake side of the compressor is connected to a sealed pipe to be drawn in. The exhaust side of the compressor is connected to a pipe to be supplied. The compressor can draw gas from the pipe to be drawn in and reduce the pressure of the gas in the pipe to be drawn in to a predetermined pressure. The compressor can compress the drawn-in gas to a pressure higher than the pressure of the gas in the pipe to be supplied and supply it to the pipe to be supplied. The cooling device can cool the gas supplied from the compressor to the pipe to be supplied. The control unit operates the compressor at a constant reference rotational speed to supply gas from the compressor to the pipe to be supplied. If the temperature of the gas cooled by the cooling device exceeds a threshold below the allowable temperature of the pipe to be supplied, the control unit lowers the rotational speed of the compressor to a lower than the reference rotational speed.

An electromagnetic relief valve (100) includes: a back pressure chamber (8) to which hydraulic oil for biasing a main poppet (5) in the valve closing direction is guided; a pilot poppet (20) for allowing or preventing communication between the back pressure chamber (8) and a discharge flow path for discharging the hydraulic oil; and a solenoid unit (S) for biasing the pilot poppet (20) in the valve closing direction. The solenoid unit (S) includes: a plunger (72) that presses the pilot poppet (20); a spring (74) that biases the pilot poppet (20) in the valve closing direction; and a coil (75) that applies, to the plunger (72), a reaction force against the biasing force of the spring (74) to which a current is applied. When reducing the pressure of a high-pressure passage (H) to the pressure of a low-pressure passage (L), a current (Ir) that generates a reaction force greater than the biasing force with which the spring (74) biases the pilot poppet (20) in the valve-closing direction is applied to the coil (75).

A mouthpiece including a body having a recess delimited by a flexible recess wall, the recess configured for encompassing a plurality of dental positions. The body is provided with a pressure chamber for containing a fluid under pressure. The recess wall is configured to deform by reciprocatingly increasing and decreasing a pressure in the pressure chamber between a decreased pressure condition and an increased pressure condition. The recess wall has a local deformability such that, when reciprocatingly increasing and decreasing the pressure in the pressure chamber, a shape of the recess wall locally changes. In the increased pressure condition, the shape of the recess wall is locally adjusted to the local shape of the dental positions encompassed by the recess wall. In the decreased pressure condition, the shape of the recess wall is locally less adjusted to the local shape of the dental positions encompassed by the recess wall.

The invention provides a compressor operation control method and a compressor. The present invention ensures stable oil supply to a compressor main body during cooling operation, and prevents the compressor main body from reversing when a drive source is stopped. The cooling operation is divided into a stop preparation period, which is a predetermined period immediately before a drive source such as an engine is stopped, and a main operation period, which is a period from the start of the cooling operation to the stop preparation period. The pressure in the receiving container (60) during the main operation period is set to be equal to or greater than a stable pressure P3 at which oil can be stably supplied to the compressor body (40), and the pressure in the receiving container (60) during the stop preparation period is reduced to a lower limit stable pressure P4, which is a pressure at which the compressor body (40) is not reversed when the drive source is stopped, and thereafter the drive source is stopped.

The invention discloses a fluid control device which comprises a first valve component and a second valve component, and the first valve component and the second valve component are both connected into a fluid pipeline. The first valve component is provided with a first flow channel and a second flow channel which allow fluid to pass through, and the second flow channel is kept in a conducting state; the second valve component controls the first flow channel to be opened and closed based on the pressure of fluid in a fluid pipeline where the first valve component is located, so that when the pressure of the fluid in the fluid pipeline rises and is larger than first pressure Pfluid 1, the second valve component acts to control the first flow channel to be opened, and the second valve component acts to control the first flow channel to be closed. When the pressure of the fluid in the fluid pipeline is reduced and is smaller than second pressure P fluid 2, the second valve component acts to control the first flow channel to be conducted; p fluid 1-P0gt; and P0-P fluid 2.

The invention provides a rapid inflation and deflation system and method for a pressurized gas cylinder and a carrier rocket. The system comprises a gas source, the gas cylinder and a pressure-adjustable inflation and deflation unit communicated with the gas source and the gas cylinder. The pressure-adjustable inflating and deflating unit comprises a plurality of valves, a pressure reducing unit and a pressure increasing unit, and inflating and deflating and pressure-adjusting inflating and deflating are carried out on the gas cylinder by switching switches of the valves; wherein the pressure reducing unit is used for reducing the pressure of the gas to meet the inlet pressure of the pressurizing unit, and the pressurizing unit is used for pressurizing the gas in a gas source or a gas cylinder. According to the embodiment of the invention, rapid inflation and deflation are carried out through a combined mode of pressure balance and pressurization of the pressurization unit, the inflation and deflation speed and efficiency are improved, and the pressurization time is shortened for ground test or rocket launching preparation; the gas inflation and deflation recovery process can be achieved only by switching the switch combination state of the valve, pipeline switching is not needed, the test or operation complexity is reduced, and the pressurization safety and efficiency are improved.

[Problem] The objective is to provide a fluid discharge system capable of reducing pressure in a piping system formed from a supply path or the like to an appropriate level while in a state of not discharging a fluid. [Solution] A fluid discharge system (10) comprises: a discharge device (30); a supply pump (20); a supply path (40) connecting the discharge device (30) and the pump so as to allow a fluid to pass therebetween; a pressure regulating tank (50), partway along the supply path (40), that allows the fluid to flow in and out thereof; and a control device (200). The control unit (200) carries out control to regulate the flow of fluid in and out of the pressure regulating tank (50) to allow for execution of a low pressure maintaining mode that maintains the internal pressure (P) of the supply path (40) during a stop period when a discharge operation is stopped at a lower pressure than a standard range of the internal pressure (P) of the supply path (40) during a discharge period when the discharge operation is performed.

To accurately perform pressure relief operation.SOLUTION: The relief valves (35) operate to return the hydraulic fluid in the first flow path (35c) to the fluid tank (12) when the pressure (P2) of the hydraulic fluid in the first flow path (P3) exceeds a set pressure (21a) corresponding to a vent pressure (P1), which is the pressure of the hydraulic fluid at the vent port (21a). The second pump (36) is connected between the vent port (35c) of the relief value (35) and the oil tank (12). The control unit (50) controls the second pump (36) so that the vent pressure (P2) decreases from a first pressure, which is an initial pressure in the pressure relief operation, to a second pressure lower than the first pressure in the pressure relief operation in which the hydraulic fluid is returned from the hydraulic actuator (11) to the oil tank (12) via the relief valve (35).SELECTED DRAWING: Figure 1

To provide a control arrangement improving reliability of process and configuring an inexpensive solution, and a diaphragm pump.SOLUTION: The current invention relates to a control arrangement 13 for controlling a sensorless diaphragm pump 14 and a control method. The control arrangement 13 includes: a control fluid entrance 1 connected to a first control fluid reservoir 1A having a pressure level raised to reference pressure; a control fluid outlet 2 connected to a second control fluid reservoir 2A having a pressure level reduced to the reference pressure; and a control fluid connection 8 for connection of a control fluid line. The control fluid entrance 1 is connected to a collection point 6 through a first proportional valve 3. The control fluid outlet 2 is connected to the collection point 6 through the second proportional valve 4. The mass flow rate sensor 5 is arranged between the collection point 6 and the control fluid connection 8. The control arrangement 13 further has a control unit 12 connected to the first proportional valve 3, the second proportional valve 4, and a mass flow rate sensor 5 in terms of signaling.SELECTED DRAWING: Figure 1