7 results about "Decreased pressure" patented technology

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.

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.

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.

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