Rejected gas recovery in gas-oil separation plants (GOSPs) is implemented. A gas phase is flowed from a GOSP to a central gas plant through a first gas flow pathway at a first flow pressure. Gas from a gas reservoir is flowed through a second gas flow pathway at a second flow pressure. The first gas flow pathway is separate from the second gas flow pathway. While flowing the gas phase through the first gas flow pathway, a decrease in the first flow pressure below a threshold flow pressure is determined. In response, a gas-gas ejector, which is fluidically coupled to the first gas flow pathway and the second gas flow pathway, is operated to drive a flow of the gas phase to the central gas plant using gas from the gas reservoir as a motive gas.

An electro-hydraulic control system for actuating a control valve includes a control module. The control module is coupled to the surface via at least one hydraulic line and two electrical power lines. The control module uses one of the hydraulic lines as a supply line and the other line as a return line if included. Each hydraulic line of the at least one hydraulic lines can be used as an open line or a close line to open or close the control valve. The control module includes two normally closed (NC) solenoid valves (SOVs) that are coupled to the electrical power lines and can be controlled from the surface to open or close. The opening or closing of the NC SOVs in cooperation with hydraulic pressure on a supply line of the hydraulic lines operates (i.e., closes or opens) the control valve.

In order to prevent leakage, a fluid control apparatus is adapted to include: a valve provided in the flow path through which the fluid flows; a pressure sensor provided upstream of the valve; a flow rate sensor provided downstream of the pressure sensor; a reference pressure determination part that is inputted with a measured flow rate from the flow rate sensor and on the basis of a flow rate-pressure map, determines a reference pressure corresponding to the measured flow rate; a reference flow rate calculation part that calculates a reference flow rate so that the deviation between the reference pressure and a measured pressure measured by the pressure sensor decreases; and a valve control part that controls the opening of the valve so that the deviation between the reference flow rate and the measured flow rate decreases.

An inflatable pillow system includes a pillow formed of an upper and lower bladder that may be independently inflated and deflated. A controller includes an air mover, a valve assembly, and a control box. The valve assembly includes an air line to the upper bladder, and an air line to the lower bladder. Each of an upper air line valve and a lower air line valve is urged into a closed position by an valve spring, and is movable into an open position by an valve servo. The air line valves may include hollow valve plungers, so that the valve springs extend into the plungers. The control box has an input for inflating and deflating the upper bladder, and an input for inflating and deflating the lower bladder.

An electro-hydraulic control system for actuating a control valve includes a control module. The control module is coupled to the surface via at least one hydraulic line and two electrical power lines. The control module uses one of the hydraulic lines as a supply line and the other line as a return line if included. Each hydraulic line of the at least one hydraulic lines can be used as an open line or a close line to open or close the control valve. The control module includes two normally closed (NC) solenoid valves (SOVs) that are coupled to the electrical power lines and can be controlled from the surface to open or close. The opening or closing of the NC SOVs in cooperation with hydraulic pressure on a supply line of the hydraulic lines operates (i.e., closes or opens) the control valve.

A fuel cell system includes, in the fuel gas system, a first fuel supplier of an external valve opening type, an inner valve opening type second fuel supplier, and a fuel gas supply pressure sensor, and when the fuel gas supply pressure is excessive, the fuel cell is operated by the first fuel supplier, and when the fuel gas supply pressure is normal, the fuel cell is operated by using the first fuel supplier and the second fuel supplier in combination.

A valve assembly includes a proportional valve having an opening cross section that can be continuously varied by an actuator; a sensor for sensing the valve output pressure; a digital regulating device; and a switching valve disposed parallel to the proportional valve. The opening cross section of the switching valve is smaller than the maximum opening cross section of the proportional valve. The regulating device is programmed (i) to automatically calculate, at runtime, using the currently given valve output pressure and the current position of the actuator, the maximum working pressure achievable at the maximum opening of the proportional valve with the valve, (ii) and to additionally open the switching valve when the computed maximum achievable working pressure falls below a predefinable target working pressure by a definable deviation value.

Techniques for controlling water pressure at a plurality of water customer service sites are described. In an example, a first plurality of water service sites having water pressure values greater than a first threshold value are identified. A second plurality of water service sites having pressure values less than a second threshold value are identified. Valves controlling water flow to respective customer service sites within the first and second pluralities of water service sites are adjusted. The adjustments increase water pressure in the second plurality of water service sites to a pressure above a minimal target pressure. The adjustment maintains the water pressure of the first plurality of service sites above the minimal target pressure. In an example, groups of water service sites are associated with respective water mains and/or water pressure sensors. Information shared between groups may assist in adjusting water valves within the water system.

A method comprises charging a first hydraulic line to have greater pressure than a second hydraulic line and energizing a solenoid valve, wherein charging the first hydraulic line and energizing the solenoid valve initiates transition of an interval control valve (ICV) from a first state to a second state. The method comprises discontinuing energizing the solenoid valve and maintaining the greater pressure in the first hydraulic line until the ICV reaches a desired state.

A computer-implemented method and/or system for controlling a material handler comprises: processing, by an electronic control unit (ECU), a plurality of electronic input signals from at least one joystick; determining an adjustment for at least one of a pair of solenoids based on at least the plurality of electronic input signals from the joystick; controlling the pair of solenoids by the ECU and each solenoid acting in opposition to each of a pair of biasing elements of an open-center directional control valve to move the directional control valve to an extension position or a retraction position from a central position; determining a setpoint buildup pressure for a central passageway of the directional control valve; and actuating a constrictive solenoid of a pressure buildup valve to constrict the central passageway based on the setpoint buildup pressure whereby the constrictive passageway increases a pressure in the central passageway of the directional control valve.