A safety valve control system may include a remotely operable control assembly, a first transducer, a valve assembly, and a compressor assembly in communication with the control assembly. The control assembly is operable to actuate the pump and valve assemblies to supply fluid to actuate the safety valve into open and closed positions, in response to one or more signals received from the first transducer. A method of operation may include maintaining the safety valve in an open or closed position while sensing a physical property with the control system; communicating a signal corresponding to the sensed physical property to the control system; and automatically closing or opening the safety valve in response to a comparison of the sensed physical property to a pre-set condition.

A gas pressure reducer (100) comprises a mobile element (2) arranged for driving a pressure regulating valve (5) according to a pressure force, a biasing element (3) for pushing the mobile element toward a rest position, and an electrically-powered master system which acts on the biasing element for varying a return force of said biasing element. The master system allows varying a reference pressure value for the regulation of the pressure existing at a low pressure gas outlet (1 LP). When the master system is no longer electrically supplied, the mobile element (2) is driven by the pressure force with respect to a last value of the return force existing just before electrical supply of said master system has stopped.

A method performed by a computing device for controlling fluid pressure in a fluid distribution network (FDN) above a threshold pressure by communicating with a plurality of pressure control stations distributed throughout the FDN to independently control a fluid pressure at each of the plurality of pressure control stations is provided. The method comprises training a machine learning algorithm to establish one or more correspondences between a measured variation in fluid demand in the FDN for a first time period and measured environmental conditions for the first time period. The method comprises predicting a variation in fluid demand in the FDN for a second, later time period based on predicted environmental conditions for the second time period and the established one or more correspondences between the measured variation in fluid demand in the FDN for the first time period and the measured environmental conditions for the FDN for the first time period. The method comprises determining, based on the predicted variation in fluid demand for the second time period, a variation in fluid pressure to be applied at the plurality of pressure control stations for the second time period to satisfy a fluid pressure condition at one or more pre-determined points in the FDN downstream from the plurality of pressure control stations. The method comprises transmitting, to the plurality of pressure control stations, an indication of the determined variation in fluid pressure to be applied at the plurality of pressure-control stations for the second time period to satisfy the fluid pressure condition at the one or more pre-determined points in the FDN.

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.