| 主权项 |
1. A network system comprising
at least one supply of pressurized liquid, a check valve, a master network connected on one side to said check valve and on the other side to several branches each connected to at least one trip element sensitive to a predetermined parameter, and an element supplying a pressurized fluid to said master network, said trip element allowing the network to be opened and vented to atmospheric pressure, this venting to atmospheric pressure opening the check valve in such a way as to allow the network and its branches to be filled with the liquid as far as the trip element, in which the connection between each branch and the network is via a valve allowing the branches not to be filled, said valve for use in a pressurized network with an upstream part and a downstream part, comprising a regulation system that is capable of maintaining a different pressure between the upstream part and the downstream part, the regulation system allowing, on one hand, to compensate the downstream pressure if the downstream pressure decreases while at the same time remains higher to a setpoint value by exclusively using the upstream pressure from the upstream part, and, on the other hand, to open the valve fully if the downstream pressure drops below the setpoint value, the regulation system comprising a piston in a cylinder connected to the downstream part by a passage comprising a restrictor, wherein the relative position of the piston to the passage determines whether the valve is in compensation mode or fully open mode. |
