A pressure-regulating valve includes a valve sleeve with first and second ends defining a longitudinal axis, a sense line, a sense piston, a main chamber, and first and second valve spools. The sleeve includes an axially aligned bore. The sense line is within the bore proximate the first end. The sense piston is within the bore between the sense line and the second end, and is configured to move along the longitudinal axis in response to pressure exerted by fluid in the sense line. The main chamber is within the bore between the sense piston and the second end, and includes supply and vent ports. The first valve spool is within the bore between the sense piston and the second end. The second valve spool is within the bore between the first valve spool and the second end.

Hydraulic systems and associated methods configured to reduce leakage past a spool valve when the system is in a neutral state. Leakage reduction is achieved by shifting the spool valve within the spool bore. The amount of shifting can be controlled by a pressure controller that sets one or pressures in the system and actively/dynamically adjusts the system to achieve a desired pressure or set of pressures by shifting the spool valve.

The invention relates to a fuel cell arrangement (10) having an anode (26) connected to an H2 inflow (48) and a cathode (30) connected to an O2 inflow (50), wherein a differential pressure control device (52) is arranged between the H2 inflow (48) and the O2 inflow (50) for controlling a differential pressure between the H2 inflow (48) and the O2 inflow (50), the differential pressure control device (52) having a fluid connection (54) between the H2 inflow (48) and the O2 inflow (50) in which a deflectable diaphragm (56) is arranged, to which a pin (64) is coupled which, when the diaphragm (56) is deflected, opens a valve (58) arranged in the H2 inflow (48).

A fuel pump system for an aerial refueling system including: a variable displacement motor operable to be driven by a hydraulic fluid pressure; a fuel pump operable to be driven by the variable displacement motor; and a drive system controller (DSC) connected to the variable displacement motor, wherein the DSC is operable to direct an operation of the fuel pump in modes comprising: a flow control mode operable to maintain an output fuel flow rate from the fuel pump to a predetermined maximum inlet pressure at a reception coupling for a receiver aircraft; a fuel pressure control mode operable to regulate the output fuel flow rate to not exceed the predetermined maximum inlet pressure; and a priority mode operable to reduce the output fuel flow rate in response to a decrease in the hydraulic pressure. Also a method of refueling a receiver aircraft.

An apparatus for controlling precursor flow. The apparatus may include a processor; and a memory unit coupled to the processor, including a flux control routine. The flux control routine may be operative on the processor to monitor the precursor flow and may include a flux calculation processor to determine a precursor flux value based upon a change in detected signal intensity received from a cell of a gas delivery system to deliver a precursor.

A flow control valve including a main valve and a pilot valve for controlling a piston of the main valve. The valve maybe controlled through a control system based o{circumflex over ()}pn measured pressures or temperatures in a system supplied or controlled by the valve. The valve may be operated as a pressure independent control valve, using pressure measurement from a supply line and exit line or return line of a hydronic HVAC system as inputs to the control system, which is operable to maintain a constant pressure drop across the system, or the valve may be operated as a temperature independent control valve, using temperature measurements from a supply line and exit line or return line of a hydronic HVAC system as inputs to the control system which is operable to maintain a constant temperature drop across the system.

A pressure regulator includes a valve body having a fluid inlet and a fluid outlet connected by a fluid passageway. An orifice is disposed between the fluid inlet and the fluid outlet. A valve seat is disposed within the fluid passageway. A movable valve plug is disposed within the fluid passageway, and the valve plug interacts with the valve seat to selectively open or close the fluid passageway. A cage is disposed in the fluid passageway, the cage surrounds the valve plug, and the cage includes a mechanical stop that limits movement of the valve plug within the cage away from the valve seat.

A pressure regulator includes a valve body having a fluid inlet and a fluid outlet connected by a fluid passageway. An orifice is disposed between the fluid inlet and the fluid outlet. A valve seat is disposed within the fluid passageway. A movable valve plug is disposed within the fluid passageway, and the valve plug interacts with the valve seat to selectively open or close the fluid passageway. A cage is disposed in the fluid passageway, the cage surrounds the valve plug, and the cage includes a mechanical stop that limits movement of the valve plug within the cage away from the valve seat.

A valve control apparatus comprises: a generator configured to generate a first set pressure signal; and a valve opening controller configured to perform the first valve opening control on the basis of the target pressure and, after the first valve opening control, perform the second valve opening control performing feedback control on the basis of a difference between the first set pressure signal and the chamber pressure. The generator generates the first set pressure signal on the basis of a first set pressure locus converging from the chamber pressure at the time of switching from the first valve opening control to the second valve opening control to the target pressure with a predetermined time constant.

Disclosed is a paired compress gas energy power system and power method. The paired compress gas energy power system includes: a paired compress gas energy storage device having a high pressure air container and a low pressure air container, the high pressure air container is filled with a high pressure gas, the low pressure air container is filled with a low pressure gas; a paired compress gas energy engine, respectively connected to the low pressure air container and the high pressure air container; and a power device connected to the rotary shaft of the paired compress gas energy engine, the power device is driven by the paired compress gas energy engine. The invention converts the paired compress gas energy into the mechanical torque energy through the paired compress gas energy engine to drive the power device to work, or to drive the generator to generate electric energy.