Fisher 377 Instruction Manual
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Fisher 377 Instruction Manual

Trip valve
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Instruction Manual
D200319X012
r
Fisher
377 Trip Valve
Contents
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Introduction

Scope of Manual

This instruction manual provides installation, operation, maintenance, and parts information for the Fisher 377 trip
valve. Refer to separate instruction manuals for information regarding the control valve, actuator, and accessories.
Do not install, operate, or maintain a 377 trip valve without being fully trained and qualified in valve, actuator and
accessory installation, operation, and maintenance. To avoid personal injury or property damage, it is important to
carefully read, understand, and follow all of the contents of this manual, including all safety cautions and warnings. If
you have any questions regarding these instructions contact your Emerson Process Management sales office before
proceeding.

Description

377 pressure-sensing trip valves, shown in figures 1, 2, and 3, 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 cause the actuator to fail up, lock in the last position, or fail down. When the supply
pressure rises above the trip point, the 377 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. 377 trip valves are used with all types of piston actuators.
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Figure 1. Fisher 377 Trip Valve Mounted on Size 130
585C Actuator
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377 Trip Valve
August 2012

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Summary of Contents for Fisher 377

  • Page 1: Table Of Contents

    Refer to separate instruction manuals for information regarding the control valve, actuator, and accessories. Do not install, operate, or maintain a 377 trip valve without being fully trained and qualified in valve, actuator and accessory installation, operation, and maintenance. To avoid personal injury or property damage, it is important to carefully read, understand, and follow all of the contents of this manual, including all safety cautions and warnings.
  • Page 2 Trip valve moves piston to either up/down position and requires actuator configuration for actual counterclockwise movement. Mounting All 377 Trip Valves can be converted to any of the above fail modes with minor hookup changes Top‐Mounted: Manifold‐mounted between a Fisher 3570 positioner and 480 actuator (manifolds cannot...

  • Page 3: Specifications

    Specifications Specifications for 377 trip valves are given in table 1. Educational Services For information on available courses for 377 trip valves, as well as a variety of other products, contact: Emerson Process Management Educational Services, Registration P.O. Box 190; 301 S. 1st Ave.

  • Page 4: Installation

    CAUTION 377 trip valves are leak tested to ensure that the intended actuator fail mode is maintained upon loss of supply pressure. Control system accessories, such as volume boosters with hard seats, compromise the integrity of the entire system due to...

  • Page 5: Supply Pressure Requirements

    If this cannot be avoided and a volume booster is required, a volume booster designed for tight shutoff, such as the Fisher 2625, provides a higher probability of control system integrity. Refer to figures 5 and 6 for proper installation of 377 trip valves with 2625 volume boosters.
  • Page 6 An example of an appropriate supply regulator to use with a 377 trip valve is a 64 regulator; its capacity is usually great enough to meet the demands of most trip valve/actuator combinations.
  • Page 7 CAUTION To ensure the integrity of control systems utilizing a 2625 volume booster in conjunction with a 377 trip valve, apply supply pressure to the volume booster and to the volume tank (volume tank not required on 377L trip valve) through a check valve.

  • Page 8: Operating Information

    Instruction Manual 377 Trip Valve August 2012 D200319X012 WARNING Personal injury or property damage could result from bursting of parts due to temperature fluctuations or extreme heat. If temperature fluctuations or extreme heat cannot be avoided, use a relief valve to protect the volume tank.
  • Page 9 Instruction Manual 377 Trip Valve D200319X012 August 2012 Figure 7. Fisher 377D Trip Valve Shown in Tripped Condition MAIN SPRING SPRING ACTUATOR VALVE PLUG VENT UPPER DIAPHRAGM CONTROL DEVICE EXHAUST PORT SUPPLY PRESSURE LOWER DIAPHRAGM PORT A CHECK PORT D...

  • Page 10: Principle Of Operation

    Instruction Manual 377 Trip Valve August 2012 D200319X012 Figure 8. Fisher 377L Trip Valve Shown in Tripped Condition MAIN SPRING ACTUATOR SPRING VALVE PLUG VENT UPPER DIAPHRAGM EXHAUST PORT SUPPLY PRESSURE LOWER DIAPHRAGM PORT A CONTROL PORT D DEVICE PORT B...

  • Page 11: 377L Trip Valve

    D and E. A volume tank is charged to the maximum supply pressure through a check valve. The check valve maintains maximum supply pressure in the volume tank if the supply pressure drops. Figure 9. Fisher 377U Trip Valve Shown in Tripped Condition MAIN SPRING...

  • Page 12: 377U Trip Valve

    Instruction Manual 377 Trip Valve August 2012 D200319X012 When supply pressure falls below the trip point, the exhaust port opens venting supply pressure from the lower diaphragm. This causes the upper ports of the plug assemblies to close and the lower ports to open. Because ports C and F are plugged, no pressure change occurs on either side of the actuator piston and the piston is pressure‐locked in...

  • Page 13: Trip Valve Part Replacement Procedures

    Instruction Manual 377 Trip Valve D200319X012 August 2012 1. Isolate the actuator/valve assembly from the process loop. 2. Provide a means of monitoring the supply pressure input to the trip valve. 3. Starting with normal supply pressure applied to the trip valve, slowly reduce the supply pressure until the trip valve trips.

  • Page 14: Replacing Stem/Plug Assembly Parts

    Instruction Manual 377 Trip Valve August 2012 D200319X012 8. Inspect the lower diaphragm (key 17) and pusher plate (key 18), and replace them if damaged or excessively worn. 9. Place the upper diaphragm assembly (keys 8, 9, 10, 11, 12, 13, 14, and 15), travel stop (key 75, aluminum housing only), spring (key 6), upper spring seat (key 5), diaphragm spacer (key 19), pusher plate (key 18), and diaphragm (key 17) onto the body assembly (key 16).

  • Page 15: Parts Ordering

    Use only genuine Fisher replacement parts. Components that are not supplied by Emerson Process Management should not, under any circumstances, be used in any Fisher trip valve. Use of components not supplied by Emerson Process Management may void your warranty, might adversely affect the performance of the instrument, and could cause personal injury and property damage.
  • Page 16 Instruction Manual 377 Trip Valve August 2012 D200319X012 Table 2. Common Parts (continued) PART MATERIAL QUANTITY Trip Valve Construction DESCRIPTION NUMBER REQUIRED Aluminum Stainless Steel Nitrile Nitrile O‐ring Fluorocarbon Fluorocarbon CF3M SST casting Pilot body assembly Aluminum/anodized aluminum (316L SST, cast)
  • Page 17 Instruction Manual 377 Trip Valve D200319X012 August 2012 Table 2. Common Parts (continued) PART MATERIAL QUANTITY Trip Valve Construction DESCRIPTION NUMBER REQUIRED Aluminum Stainless Steel Volume Tank (for 377D, 377U, 377CW, and 377CCW only) (not shown) Standard 11.8 L / 721 inch / 3.1 gal...
  • Page 18 Instruction Manual 377 Trip Valve August 2012 D200319X012 Table 2. Common Parts (continued) PART MATERIAL QUANTITY Trip Valve Construction DESCRIPTION NUMBER REQUIRED Aluminum Stainless Steel Screen (not shown) Stainless steel Stainless steel For boss mounted 377D, 377U, 377CW or   377CCW...

  • Page 19: D200319X012 August

    Instruction Manual 377 Trip Valve D200319X012 August 2012 Figure 10. Trip Valve Assembly NOTE: KEY NUMBERS 7, 20, 64, 65, 76, 78, 79, 80, 88 NOT SHOWN NOTE: KEY NUMBERS 7, 20, 30, 33, 36, 37, 64, 65, 76, 78, 79, 80, 88 NOT SHOWN...
  • Page 20 Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user. Fisher and FIELDVUE are marks owned by one of the companies in the Emerson Process Management business unit of Emerson Electric Co. Emerson Process Management, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co.

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