In accordance with at least one aspect of this disclosure, a system can include, a moveable component configured to move between one or more positions, a biasing member operatively connected on a first side to bias the moveable component to a respective one of the one or more positions, and a preload member operatively connected to provide a force to a second side of the biasing member. An actuator can be operatively connected to move the preload member in response to a signal from a controller.

A fluid pressure reducing valve apparatus includes a pressure reducing valve. The valve has: a body containing a fluid-flow chamber, a liquid supply orifice into the chamber, a liquid outlet from the chamber, a regulation plate opposed to the orifice, a spring acting to urge the plate towards the orifice, and a diaphragm between the plate and the body to close the chamber between them. A controllable motor drive acts between the body and an end of the spring remote from the plate. A flow meter is positioned downstream of the outlet. A controller is arranged to receive flow data from the flow meter and to control the motor drive for withdrawal of the remote end of the spring in accordance with flow rate measured by the flow meter. For an increase in demand flow, the plate is partially withdrawn to maintain downstream pressure on such increase and vice versa.

In some examples, a pressure reducing valve includes a valve body defining a defining a flow path and a restricting element within the flow path. A sensing element is configured to modify a position of the restricting element in the flow path. The sensing element defines a first area in fluid communication with the flow path and a second area fluidly isolated from the flow path. The pressure reducing valve includes control circuitry configured to determine a differential pressure over a section of the flow path, determine a position of the restricting element, and determine a flow rate based on the differential pressure and the position of the restricting element.

In some examples, a pressure reducing valve includes a valve body defining a defining a flow path and a restricting element within the flow path. A sensing element is configured to modify a position of the restricting element in the flow path. The sensing element defines a first area in fluid communication with the flow path and a second area fluidly isolated from the flow path. The pressure reducing valve includes control circuitry configured to determine a differential pressure over a section of the flow path, determine a position of the restricting element, and determine a flow rate based on the differential pressure and the position of the restricting element.

A fluid pressure reducing valve apparatus includes a pressure reducing valve. The valve has: a body containing a fluid-flow chamber, a liquid supply orifice into the chamber, a liquid outlet from the chamber, a regulation plate opposed to the orifice, a spring acting to urge the plate towards the orifice, and a diaphragm between the plate and the body to close the chamber between them. A controllable motor drive acts between the body and an end of the spring remote from the plate. A flow meter is positioned downstream of the outlet. A controller is arranged to receive flow data from the flow meter and to control the motor drive for withdrawal of the remote end of the spring in accordance with flow rate measured by the flow meter. For an increase in demand flow, the plate is partially withdrawn to maintain downstream pressure on such increase and vice versa.

A fluid pressure reducing valve apparatus includes a pressure reducing valve. The valve has: a body containing a fluid-flow chamber, a liquid supply orifice into the chamber, a liquid outlet from the chamber, a regulation plate opposed to the orifice, a spring acting to urge the plate towards the orifice, and a diaphragm between the plate and the body to close the chamber between them. A controllable motor drive acts between the body and an end of the spring remote from the plate. A flow meter is positioned downstream of the outlet. A controller is arranged to receive flow data from the flow meter and to control the motor drive for withdrawal of the remote end of the spring in accordance with flow rate measured by the flow meter. For an increase in demand flow, the plate is partially withdrawn to maintain downstream pressure on such increase and vice versa.

Proposed are a pressure control method for a high-pressure regulator to prevent internal leak, and a high-pressure shut-off valve so as to minimize an internal leak, due to high-pressure gas remaining in a high-pressure fuel line when a valve of a gas storage tank is shut off, caused by a pressure difference between a front end portion and a rear end portion of the high-pressure regulator introducing or discharging high-pressure gas. Accordingly, the convenience for connecting work is provided, the high safety is ensured, and the high-pressure regulator is used with the high reliability.

An electronic device and a method are disclosed. The electronic device includes a sensor, a memory, a processor, and a communication interface. The sensor is configured to detected vibrations of a gas pressure regulator. The memory is configured to store the detected vibrations. The processor is configured to record the detected vibrations caused by the gas pressure regulator at a predetermined time interval. The processor is also configured to generate a report of the recorded vibrations caused by the gas pressure regulator to indicate the operational status of the gas pressure regulator, wherein the generated report includes at least two recorded vibrations. The communication interface configured to transmit the generated report.

Provided is a pressure control method for a high-pressure regulator to prevent internal leak, and the high-pressure shut-off valve so as to minimize an internal leak, due to high-pressure gas remaining in a high-pressure fuel line when a valve of a gas storage tank is shut off, caused by a pressure difference between a front end portion and a rear end portion of the high-pressure regulator introducing or discharging high-pressure gas. Accordingly, the convenience for connecting work is provided, the high safety is ensured, and the high-pressure regulator is used with the high reliability.

A gas regulating and control system is provided that is configured to be received at a gas regulator installed at a remote location for remotely controlling the gas flow, the system including a gas control module including a plurality of sensors associated with the gas regulator, the plurality of sensors configured to sense a corresponding plurality of parameters associated with the gas regulator. The gas control module is configured to automatically turn off the gas to the gas regulator when one or more of the corresponding plurality sensed parameters is determined to be outside an acceptable range for the sensed parameter.