A pressure control valve has: a passageway having a flow opening; an member displaceable relative to the opening for obstructing the opening by differing amounts; a piezo actuator; and a linkage mechanism adapted to amplify a dimensional change in the piezo actuator and to use the amplified dimensional change to displace the member relative to the opening, wherein the linkage mechanism comprises a frame attached to a wall and fixed at a first end in relation to the passageway, a portion of the frame moveable in a first direction while being substantially restrained in a second direction orthogonal to the first direction, the piezo actuator extending between the wall and the movable portion such that an expansion of the piezo actuator results in movement of the movable portion in the first direction by an amount greater than the expansion of the piezo actuator, the moveable portion connected to the member.

This fuel gas supply device and method comprises: a fuel gas supply line (L3) that connects a fuel gas supply source (100) and a combustor (12); a fuel gas compressor (24) that is provided to the fuel gas supply line (L3) and compresses fuel gas; a pressure detector (32) that detects a pressure (P2) of fuel gas which is introduced to the fuel gas compressor (24); and a pressure reducing valve (23) that is provided upstream from the fuel gas compressor (24) of the fuel gas supply line (L3) and that adjusts the pressure of the fuel gas so that a pressure (P1) of the fuel gas which is detected by the pressure detector (32) attains a certain target suction pressure consisting of a rated discharge pressure of the fuel gas compressor (24).

A device for controlling a required pressing force from a current collector of a vehicle on an overhead line, a method for using such a device and a power car having at least one such device, utilize a pilot control circuit, a working pressure control circuit and an adjustment device including a relay valve. The pilot control circuit adjusts a pilot control pressure and the relay valve uses a pilot control pressure to control a power pressure to provide a required working pressure for the pressing force of the current collector.

An apparatus for regulating pressure in a three-dimensional printer comprises a controller and a connector. The controller is configured to receive a value of a measured pressure within the three-dimensional printer. The connector is connectable between a gas outlet of the printer and an inlet of an external gas extraction system. The controller is configured to compare the received value of measured pressure with a predetermined value. If the received value differs from the predetermined value, the controller is configured to permit ambient air to flow into the external extraction system.

An air maintenance device (AMD) for fire protection system includes a gas inlet configured to couple with a source of compressed gas; a gas outlet configured to couple with a pipe network of the fire protection system; a first sensor configured to sense a system parameter of the pipe network of the fire protection system and to produce a first output corresponding to the system parameter; a first gas flow valve in fluid communication with and between the inlet and the outlet; and a first control circuit in communication with the sensor and with the first gas flow valve. The first gas flow valve is electrically controlled and configured to control a flow of gas from the source of compressed gas into the pipe network. The control circuit is configured to receive the first output from the sensor and output a control signal that is a function of the system parameter to the first gas flow valve. Other example AMDs, systems including AMDs, methods of installing AMDs, and methods of suppling gas to a pipe network using an AMD are also disclosed.

A controller includes an opening degree control section configured to control a valve element opening degree of the valve main body based on a pressure measurement value of the vacuum chamber measured by a vacuum meter, and an estimation section configured to estimate measurement lag information of pressure measurement value with respect to a pressure of the vacuum chamber based on (a) an exhaust expression including a second-order derivative term of the pressure measurement value and indicating a relationship between an effective exhaust speed of a vacuum pumping system for the vacuum chamber and the pressure measurement value and (b) a pressure measurement value measured during a pressure response when the valve element opening degree is step-changed, and the opening degree control section controls the valve element opening degree based on the measurement lag information estimated by the estimation section.

The present invention is a fluid distribution system comprising connected conduits (e.g., lines) wherein fluid flows, such as pipes within a building. The lines may be configured to: (i) include multiple lines that connect at intersections (some of the intersections will be identified as nodes); and (ii) incorporate node units associated with line pressure loss simulation assemblies (“LLSAs”). Activities of a node unit incorporating a LLSA can result in alterations in fluid pressure, such as by a loop control process to reposition balancing valves or other valves of one or more LLSAs, and/or by alteration of the speed of the system pump. These activities adjust fluid pressure to cause the system to produce a balanced and high efficiency energy transfer (e.g., heating or cooling), and do not involve or require any identification or use of any specific, fixed or absolute pressure value. They function based on an operation locus (for a node unit) and/or an operation locus range (for node unit groupings) to adjust the fluid pressure.

A fast glue replenishment device by using a dispensing cartridge is illustrated, which has a power unit, a regulation unit, a gas container, a control unit and a dispensing cartridge. The regulation unit controls a gas pressure of a gas output by the power unit to be equal to a necessary gas pressure value which the dispensing cartridge pushes a supply material for dispensing. When the dispensing cartridge pushes the supply material for dispensing, the gas container continuously provides the gas having the gas pressure value into the dispensing cartridge by using the control unit, such that the dispensing cartridge is maintained to have the necessary gas pressure value which the dispensing cartridge pushes the supply material for dispensing. Thus, the supply material is pushed in a short path and in a time differential to increase accuracy of pushing the supply material for dispensing.

A method (400) for controlling a regulating valve (206) of a packaging machine (100), wherein the packaging machine (100) is a roll-fed packaging machine configured to receive a roll of a carton-based packaging material (102). The packaging machine (100) is configured to be connected to a processing line (202) via the regulating valve (206), wherein the processing line (202) is configured to feed a liquid food product (216) to the packaging machine (100) through the regulating valve (206). The method (400) comprises determining (S402) a product flow, using a flow meter (106), of the liquid food product in the packaging machine (100); determining (S404) an inlet pressure measurement (306), using a pressure sensor (204), of the liquid food product in the packaging machine (100); and making use of the inlet pressure measurement to the packaging machine (100) for adjusting the regulating valve (206), said regulating valve being configured to receive an output signal from a flow feed forward module (308) in combination with an output signal from a flow proportional-integral-derivative (PID) module (310), wherein the flow feed forward module (308) has the inlet pressure measurement (306) and a flow set point as input signals, and wherein the flow PID module (310) has the product flow and the flow set point as input signals.

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.