91results about "Pressure difference control" patented technology

To provide a constant differential pressure valve which is compact in size and can be realized at low cost. In the constant differential pressure valve according to the present invention, a pipe forming a body thereof not only accommodates internal structures, such as a differential pressure control mechanism, a movable core, and a fixed core, but also serves as part of piping of a refrigeration cycle. Further, a solenoid section including a solenoid coil is disposed outside the pipe in a manner surrounding the same. Therefore, substantial integration of the differential pressure control mechanism into the piping of the refrigeration cycle can be achieved, which makes the entire constant differential pressure valve very simple in construction. As a result, reduction of the size of the constant differential pressure valve and resultant reduction of material costs and manufacturing costs can be achieved, which makes it possible to achieve low costs of the constant differential pressure valve.

There is provided a flow rate control valve of a constant flow-rate control type, which is simple in construction. The flow rate control valve is configured, by regarding a evaporator as a restriction passage, to include a constant differential pressure control valve for controlling the differential pressure before and after pressure loss caused by passage of refrigerant through the evaporator to be substantially constant. In the constant differential pressure control valve, a valve element receives pressure from the outlet of the flow rate control valve in a valve-closing direction, and a piston receives pressure from the outlet of the evaporator in a valve-opening direction. By controlling the differential pressure between pressure at the inlet of the evaporator and the pressure at the outlet of the evaporator such that it is substantially constant, the constant differential pressure control valve causes the refrigerant to flow into the evaporator at a constant flow rate dependent on electric current that energizes a solenoid. This makes it unnecessary to form a restriction passage in the flow rate control valve, and hence the construction of the flow rate control valve can be simplified, which makes it possible to provide a flow rate control valve manufactured at low cost.

The invention discloses a variable pressure difference load sensitive multiple-way valve. According to the variable pressure difference load sensitive multiple-way valve disclosed by the invention, each linked valve group adopts a novel element electro hydraulic pressure compensation valve, so that compensation pressure difference real-time continuous control and compensation valve core real-timeposition feedback monitoring are realized, and the problems that under the flow rate saturated working condition, a conventional LS system flow rate is mismatched, the diversion ratio of an LUDV system is fixed, and the motor coordination performance of an executor is poor are solved. The variable pressure difference load sensitive multiple-way valve disclosed by the invention has the advantages of being high in working condition applicability, high in flow distribution precision, high in technical performance and the like.

The present disclosure relates to an apparatus (10) for pressurizing a first substance, such as a liquid, gas or particulate material, to a pressure substantially equal or similar to the pressure of a second substance, i.e. a reference substance. The pressure of the reference substance may be transient so the pressure of the first substance must be varied accordingly. The present disclosure includes a bladder (71) disposed within a sealed can (40), an inlet passage (24a) in communication with the interior (41) of the can and an outlet passage (26a) in communication with the interior of bladder (71). The reference substance may be directed into the interior (41) of the can (40) via the inlet passage (24a) and pressurizes the bladder (71) and thus the first substance stored therein, thereby causing the first substance to be expelled via the outlet passage (26a) with a pressure substantially corresponding to that of the reference substance. Many applications exist that require two substances to be of a similar pressure. For example, an engine may be adapted to run on low lubricity fuel provided a pressurized lubricant is introduced to the pressurized fuel before being directed towards the injector.

The invention discloses a comprehensive balance discharge adjustment method for a parallel tank propulsion system. The adjustment method comprises the following steps of (1), setting state parametersbefore adjustment, (2) performing oxygen tank balance discharge adjustment, and (3) performing fuel tank balance discharge adjustment. According to the comprehensive balance discharge adjustment method, the fact that the actual installation positions of spacecraft parallel tanks are discrepant is considered, and the mass of residual propellant in the two tanks after adjustment is independent of the mass before adjustment in the process of balance discharge adjustment of the parallel tank propulsion system so that comprehensive balance adjustment requirements of 'propellant mass * tank axis distance' can be realized and adapted. A main process and a sub process are fully parameterized, and an iterative cycle, an interpretation branch and other calculation methods are introduced so as to facilitate programming of the calculation program, thus reducing the time for determining control parameters.

An inline gas/liquid infusion system featuring an electronic control logic and subsystem having a signal processor configured to: receive signaling containing information about a liquid pressure of an incoming liquid provided from a pump to an inline gas liquid absorption device and about a gas pressure of an incoming gas provided to the inline gas liquid absorption device; and determine corresponding signaling containing information to control the liquid pressure of the incoming liquid provided from the pump to the inline gas liquid absorption device in order to provide real time adjustable set point output levels of gas absorption in the inline gas liquid absorption device, based upon the signaling received.

In order to provide a flow rate control apparatus capable of reducing pressure loss due to a downstream valve while enhancing responsiveness in flow rate control, a controller is designed to control the downstream valve on the basis of a flow rate deviation when a valve opening of the downstream valve is smaller than a predetermined valve opening. The controller is designed to control an upstream valve on the basis of the flow rate deviation when the valve opening of the downstream valve is the predetermined valve opening or more.

A proportioning valve for a reverse osmosis system that controls the production of product water by the differential pressure across the purification membrane. By sensing increasing tank pressure to actuate the proportioning valve, the flow of waste water is restricted. Placement of seals within the cavity of the valve, as well as placement of waste water inlet and outlet ports, protects tension components that provide reverse tank pressure from waste water exposure. A needle valve assembly responsive to an actuating assembly that senses tank pressure removes the need for an inlet tank water port while restricting water flow.