Fi-sher 377 Series Trip Valve The Fi-sher 377 pressure-sensing trip valve provides automatic fail-safe action for pneumatic actuators when instrument air supply pressure drops below a predetermined level. Upon recovery of supply pressure, the unit resets automatically to restore normal control. Product Overview A single 377 trip valve can perform the functions that previously required multiple switching valves, reducing complexity and spare parts. Fail modes (up, down, or
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