| 摘要 |
A valve device for controlling the supply of liquid pressure from a pump to two liquid pressure accumulators in a dual line liquid pressure braking system for a vehicle has an inlet port, two outlet ports and a vent port. The inlet port communicates with each outlet port via a respective non-return valve. Communication between the inlet port and the vent port is controlled by a normally closed valve which may be opened by means responsive directly or indirectly to the pressure at the outlet ports. The pressure responsive means responsive directly to the pressure at the outlet ports may comprise two pistons acting through a common beam which is hinged centrally to a plunger, movement of the plunger being arranged to open the normally closed valve. The valve device may include two fluid pressure responsive electric switches which are responsive to the pressure at a respective one of the outlet ports and which are arranged to operate a warning device.
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