Product Details
The 377 Series pressure-sensing trip valves are for control applications where a specific valve/actuator action is required when supply pressure falls below a specific point. When supply pressure falls below the trip point, the trip valve causes the actuator to fail up, lock in the last position, or fail down. When the supply pressure rises above the trip point, the 377 Series trip valve automatically resets, allowing the system to return to normal operation. The trip valve can be top-mounted on a manifold, yoke-mounted, or bracket-mounted to match the application requirements. The 377 Series trip valves can be used with 480, 585C, 1061, 1066, 1069, and G Series piston actuators
Available Configurations
377 Trip Valve: Includes check valve, but no volume
tank: user configured for locking position. For field use or replacement.
When supply pressure falls below the trip point,
377D Trip Valve: Fails actuator piston down. Includes check valve and volume tank.
377L Trip Valve: Locks actuator piston in the last position.
377U Trip Valve: Fails actuator piston up. Includes check valve and volume tank.
377CW Trip Valve: Fails fully clockwise to close valve.
Requires check valve and volume tank. Trip valve moves piston to either up/down position and requires actuator configuration for actual clockwise
movement.
377CCW Trip Valve: Fails fully counterclockwise to close valve. Requires check valve and volume tank.
Trip valve moves piston to either up/down position and requires actuator configuration for actual counterclockwise movement.
All 377 Trip Valves can be converted to any of the above fail modes with minor hookup changes.
Allowable Supply Pressure for Trip Valve(1)
Maximum: 10.3 bar (150 psig)
Minimum: 3.8 bar (55 psig)
Outlet Pressure
Normal Operation: Pressure from control device
Fail‐Up or Fail‐Down Mode: Maximum volume tank
pressure
Lock‐In‐Last‐Position: Respective cylinder pressure
Trip Point(2)
Adjustable from a minimum of 2.8 bar (40 psig) to a maximum of 72 percent of supply pressure;
Reset: 12.5 to 33 percent above adjusted trip point
Flow Coefficients (Cv)(3)
Depends on flow path (shown in figure 3) as follows:
Port A to Port B: 0.47
Port B to Port C: 0.56
Port D to Port E: 0.48
Port E to Port F: 0.64
Pressure Connections
1/4 NPT internal
Temperature Capabilities(1)
Nitrile Diaphragms and O‐Rings: -40 to 82C (-40 to 180F)
Fluorocarbon Diaphragms and O‐Rings: -18 to 104C (0 to 220F)
Volume Tank Maximum Internal Working Pressure (for 377D, 377U, 377CW and 377CCW trip valves)
Standard: 10.3 bar (150 psig) for non‐ASME approvedapplications.
ASME Approved Applications: Rated 10.3 bar (150psig), maximum; 9.3 bar (135 psig), recommended.
Hazardous Area Classification
Complies with the requirements of ATEX Group II
Category 2 Gas and Dust Mounting
Top‐Mounted: Manifold‐mounted between a Fisher 3570 positioner and 480 actuator (manifolds cannotbe supplied with Fisher 585C, 1061, 1066, and 1069
piston actuators)
Side‐Mounted: Yoke‐mounted or bracket‐mounted for use with a FIELDVUE™ DVC6000 or DVC6000f digital valve controller
Approximate Weight
Trip Valve: 2.0 kg (4.5 pounds)
Mounting Manifold: 0.5 kg (1.2 pounds)
Volume Tank: Varies between 5.4 and 21 kg (12 and 47 pounds) depending on size
Declaration of SEP
Fisher Controls International LLC declares this product to be in compliance with Article 3 paragraph
3 of the Pressure Equipment Directive (PED) 97 / 23 /EC. It was designed and manufactured in accordance with Sound Engineering Practice (SEP) and cannot
bear the CE marking related to PED compliance.
However, the product may bear the CE marking toindicate compliance with other applicable European Community Directives
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Business Type: Trading Company
China
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