| 摘要 |
A fluid pressure controller or emergency pressure controller comprises changeover valve means for substitution of the controller for normal control means and isolation thereof, pressure reducing means for regulating supply pressure through the controller to a pneumatically operable pressure varying means for an enclosure, and controllable valve means for controlling the output pressure from the controller. The controllable valve means may be a bleed valve, settable either manually or by a pressure capsule responsive to pressure in the enclosure. Preferably the normal control means is a fluidic pressure control system for the enclosure, and the fluid pressure controller functions as a selectively operable override controller during emergency conditions, such as upon malfunction of the normal control means.
|
