A fluid pressure control apparatus includes a proportional solenoid valve having a solenoid portion and a valve portion operatively connected between a fluid inlet port and a fluid outlet port fluidly coupled to a pressure sensor. An electronic controller receives a first signal from the pressure sensor, receives a second signal corresponding to a pressure set point, and outputs a control signal to the solenoid valve. A flameproof/explosion proof or pressurized/purged enclosure houses the electronic controller and the solenoid portion of the solenoid valve, and a manifold block mounted to the enclosure covers and closes an opening of the enclosure. The manifold block includes internal passageways connecting the valve portion of the solenoid valve between the fluid inlet port and the fluid outlet port. The pressure sensor is arranged outside the enclosure, with the first signal from the pressure sensor being conducted into the enclosure via a fluid-tight electrical feedthrough.

An actuation pressure to actuate one or more hydraulic actuators may be determined based on a load on the one or more hydraulic actuators of a robotic device. Based on the determined actuation pressure, a pressure rail from among a set of pressure rails at respective pressures may be selected. One or more valves may connect the selected pressure rail to a metering valve. The hydraulic drive system may operate in a discrete mode in which the metering valve opens such that hydraulic fluid flows from the selected pressure rail through the metering valve to the one or more hydraulic actuators at approximately the supply pressure. Responsive to a control state of the robotic device, the hydraulic drive system may operate in a continuous mode in which the metering valve throttles the hydraulic fluid such that the supply pressure is reduced to the determined actuation pressure.

A capacity control valve includes a valve housing provided with a main valve seat; a main valve body that is inserted into the valve housing and includes a main valve portion which is capable of seating on the main valve seat 10a to open and close a communication between a suction port and a control port using a driving force of a solenoid; and a pressure-sensitive body that applies a biasing force to the main valve body in an opening direction according to pressure of a fluid surrounding the pressure-sensitive body. The fluid is supplied from the control port to around the pressure-sensitive body, and the fluid is supplied from the suction port to a back pressure side of the main valve body.

A device for controlling a valve with an electromagnet having a coil fed by a current, includes a closed-loop control unit configured to control the current using a closed-loop control circuit, the closed-loop control circuit having a plurality of elements which are set by a plurality of control parameters to generate an actual pressure value at the valve, the actual pressure value depending upon the dead volume. The device includes a dead volume setting unit configured to adapt to a change in dead volume while accounting for a nonlinear relationship between the dead volume and the plurality of control parameters by simultaneously setting the plurality of control parameters based upon a single dead volume parameter.

An actuation pressure to actuate one or more hydraulic actuators may be determined based on a load on the one or more hydraulic actuators of a robotic device. Based on the determined actuation pressure, a pressure rail from among a set of pressure rails at respective pressures may be selected. One or more valves may connect the selected pressure rail to a metering valve. The hydraulic drive system may operate in a discrete mode in which the metering valve opens such that hydraulic fluid flows from the selected pressure rail through the metering valve to the one or more hydraulic actuators at approximately the supply pressure. Responsive to a control state of the robotic device, the hydraulic drive system may operate in a continuous mode in which the metering valve throttles the hydraulic fluid such that the supply pressure is reduced to the determined actuation pressure.

A coaxial gas valve assembly includes a gas inlet, a gas outlet, a valve tube, and a shaft member. A main valve is movable between a closed position and an open position (broadly, openable and closable). A main spring is positioned to resiliently bias the main valve in its closed position. A redundant valve is movable between a closed position and an open position (broadly, openable and closable). A redundant spring is positioned to resiliently bias the redundant valve in its closed position. A solenoid coil is positioned to electromagnetically move the shaft member within the valve tube. A balance diaphragm is connected to the valve tube. A gas path through at least the valve tube allows gas flow from a first side of the balance diaphragm to a second side of the balance diaphragm to reduce a pressure difference between the first and second sides of the balance diaphragm.

Various embodiments include a method for controlling a pressure dissipation valve comprising a closure element, a spring applying a spring force urging the closure element toward the closed position, and an electromagnetic actuator responding to an applied voltage to urge the closure element to an open position. The method may include: applying a constant voltage until the closure element begins motion counter to the spring force; immediately ending the voltage upon the beginning of motion; thereafter, applying a pulsed voltage to the actuator to induce a substantially constant holding-open current intensity; maintaining the pulsed voltage for a predetermined duration to hold the closure element open; and interrupting the application of voltage after the predetermined duration, wherein the closure element moves into the closed position as a result of the spring force.

Adjustment and remote control system with a pressure regulator for irrigation systems to regulate the water pressure at the outlet, and consequently its flow, being crucial to assure the uniformity and the quantity of water as applied. In the adjustment and remote control system for pressure in irrigation systems, the electronic control board is informed of the target pressure at the outlet of the pressure regulator as disclosed in this document; it reads the current pressure of the adjustment and control system by means of the electronic pressure sensor and, if the pressure is lower than the target, a solenoid valve for pressure increase is activated, using the pressure generated by a pressure generator in any given fluid, and, if the pressure is higher, that pressure is reduced.

Exemplary embodiments are directed to systems and methods used to minimize force variation from a solenoid through an operating stroke. The systems and methods generate a near constant or substantially constant force solenoid assembly which can be used in a force driven device, such as, for example, a pressure regulator for accurately controlling pressure in a pressurized flow system. The systems and methods are based on an initial solenoid characterization and include an application of springs and placement of the solenoid within the system at a gap distance to minimize variation in force in the operating stroke of a commercially available solenoid.

A proportional valve includes an actuator, having a first magnet element and a second magnet element that are energized by wire coils; a non-magnetic carrier in which the first magnet element and the second magnet element are mounted; a first spring beam to which the non-magnetic carrier is suspended adjacent to the first magnet element, and a second spring beam to which the non-magnetic carrier is suspended adjacent to the second magnet element; and a flux frame that conducts magnetic field lines through the actuator. When the wire coils are energized, a magnetic field is created which causes the non-magnetic carrier to move against a valve operator to move a valve poppet away from the closed position against a valve seat, thereby opening the valve. The first and second spring beams restrain the movement of the non-magnetic carrier to an arc of sufficient radius that said movement is quasi-linear.