What is the difference between a Reliable Type D double interlock preaction system and a Type F double interlock preaction system?
All double interlock preaction systems require two events to occur before the preaction (deluge) valve actuates: both a detector and a sprinkler must operate before the deluge valve flows water into the sprinkler system piping. Operation of the sprinkler causes the supervisory pneumatic pressure in the system piping to decrease. This decrease in pressure is the second interlock, which causes the preaction valve to trip. The difference between these two types of double interlock preaction systems is based on the method of detecting the decrease in pneumatic pressure. For the Type D system, the device that senses this decrease is a pressure switch installed on the pneumatic supply trim piping. When the pressure switch activates, it provides a second signal to a cross-zoned releasing panel, causing the releasing circuit to energize the solenoid valve. For a Type F system, a low-pressure pneumatic actuator, which is a mechanical device, opens, causing the push-rod chamber of the deluge val
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