| 摘要 |
A device is provided for controlling the initial pressurization of a pneumatic system having a pressure supply line with an inlet end and a tail end and at least one pneumatic actuator in the system. The device includes a pneumatic valve having a first and second inlet port and an outlet port. The valve is movable between a first position in which a first fluid passageway connects the first inlet port to the outlet port, and a second position in which a second fluid passageway connects the second inlet port to the outlet port. A user variable orifice is connected in series between the source of pneumatic pressure and the first inlet while the source is fluidly connected directly to the second inlet. Similarly, the outlet from the valve is connected to the inlet end of the pressure supply line of the pneumatic system. A biasing member urges the valve towards its first position while a pneumatic switch switches the valve to its second position whenever the pressure at the tail end of the pressure supply line exceeds a user selected pressure.
|
