Emerson Fisher 377 Instruction Manual
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Emerson Fisher 377 Instruction Manual

Emerson Fisher 377 Instruction Manual

Trip valve
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Instruction Manual
D200319X012
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
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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Emerson sales office
377 Trip Valve
June 2017
or Local Business Partner before

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Summary of Contents for Emerson Fisher 377

  • Page 1: Table Of Contents

    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.

  • Page 2: Specifications

    Instruction Manual 377 Trip Valve June 2017 D200319X012 Figure 2. Typical Fisher 377 Trip Valve Figure 3. Simplified Sectional View of Trip Valve UPPER VALVE DIAPHRAGM PLUG SPRING EXHAUST SUPPLY PORT CONNECTION RESTRICTION LOWER DIAPHRAGM PORT A PORT D PORT E...
  • Page 3 Instruction Manual 377 Trip Valve D200319X012 June 2017 Table 1. Specifications Available Configurations Pressure Connections 377 Trip Valve: Includes check valve, but no volume 1/4 NPT internal tank: user configured for locking position. For field use or replacement. Temperature Capabilities When supply pressure falls below the trip point, Nitrile Diaphragms and O‐Rings: -40 to 82_C 377D Trip Valve: Fails actuator piston down.

  • Page 4: Installation

    Instruction Manual 377 Trip Valve June 2017 D200319X012 Table 1. Specifications (continued) Declaration of SEP Engineering Practice (SEP) and cannot bear the CE marking related to PED compliance. Fisher Controls International LLC declares this However, the product may bear the CE marking to product to be in compliance with Article 4 paragraph indicate compliance with other applicable European 3 of the PED Directive 2014/68/EU.
  • Page 5 3. THE SUPPLY PRESSURE REGULATOR SPECIFIED MUST HAVE ADEQUATE CAPACITY FOR 2625 BOOSTERS. ALSO, IF THE 2625 BOOSTER IS TO BE NIPPLE MOUNTED, THE BOOSTER MUST BE MOUNTED TO A 1/2 NPT OR LARGER CYLINDER CONNECTION. SOME SMALLER CYLINDERS CANNOT BE TAPPED THIS LARGE; CONTACT YOUR EMERSON SALES OFFICE FOR AVAILABILITY ON SPECIFIC TYPES AND SIZES.

  • Page 6: Supply Pressure Requirements

    40 micrometers in diameter will suffice in most applications, check with an Emerson Automation Solutions field office and instrument industry air quality standards for use with corrosive gas or if you are unsure about the proper amount or method of air filtration or filter maintenance.
  • Page 7 Instruction Manual 377 Trip Valve D200319X012 June 2017 A supply regulator, if used, must have a flow capacity greater than the required combined capacity of the trip valve and actuator. In order to ensure proper selection of a supply regulator, be sure the C value of the regulator is greater than the appropriate flow path C value listed in table 1 for the trip valve.

  • Page 8: Operating Information

    Instruction Manual 377 Trip Valve June 2017 D200319X012 CAUTION To avoid damage and possible operational impairment to the trip valve, be careful not to get excessive pipe compound on the connections. Excess compound could result in improper pilot and cylinder valve operation. 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...

  • Page 9: Principle Of Operation

    Instruction Manual 377 Trip Valve D200319X012 June 2017 WARNING The following procedure requires taking the trip valve out of service. To avoid personal injury and property damage by an uncontrolled process medium, provide some temporary means of control of the process medium while the trip valve is out of service.

  • Page 10: 377L Trip Valve

    Instruction Manual 377 Trip Valve June 2017 D200319X012 When supply pressure is restored, it again loads the upper and lower diaphragms causing the trip valve to reset. The exhaust port closes, the upper ports of the plug assemblies open, and the lower ports close. Normal actuator control pressure from the control device is restored through ports A and B and ports D and E.

  • Page 11: 377U Trip Valve

    Instruction Manual 377 Trip Valve D200319X012 June 2017 Figure 8. Fisher 377L Trip Valve Shown in Tripped Condition MAIN SPRING ACTUATOR SPRING VALVE PLUG VENT UPPER DIAPHRAGM EXHAUST PORT SUPPLY PRESSURE DVC6200 LOWER DIAPHRAGM PORT A CONTROL PORT D DEVICE PORT B PORT E UPPER PORTS...

  • Page 12: Maintenance

    Instruction Manual 377 Trip Valve June 2017 D200319X012 Figure 9. Fisher 377U Trip Valve Shown in Tripped Condition MAIN SPRING ACTUATOR SPRING VALVE PLUG VENT UPPER DIAPHRAGM CONTROL DEVICE EXHAUST PORT SUPPLY PRESSURE DVC6200 LOWER DIAPHRAGM PORT A PORT D CHECK PORT E VALVE...

  • Page 13: Periodic Operational Check

    Instruction Manual 377 Trip Valve D200319X012 June 2017 D Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the actuator cannot suddenly open or close the valve. D Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure from both sides of the valve.

  • Page 14: Replacing Stem/Plug Assembly Parts

    Instruction Manual 377 Trip Valve June 2017 D200319X012 1. Remove the adjusting screw cap (key 1), and loosen the hex nut (key 3) that locks the set screw (key 2). Loosen the set screw to remove all spring compression. 2. Remove the cap screws (key 7, not shown) from the spring case, and lift off the body assembly (key 16) and attached parts from the trip valve body (key 21).

  • Page 15: Parts Ordering

    Use only genuine Fisher replacement parts. Components that are not supplied by Emerson Automation Solutions should not, under any circumstances, be used in any Fisher trip valve. Use of components not supplied by Emerson Automation Solutions 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 June 2017 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) Nitrile Nitrile Diaphragm...
  • Page 17 Instruction Manual 377 Trip Valve D200319X012 June 2017 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 21.6 L / 1315 inch / 5.7 gal...
  • Page 18  1/4 NPT x 1/4 O.D. fittings, determine the part name, size, and number of replacements  1/4 NPT x 3/8 O.D. required and contact your Emerson sales office or Local Business Partner.  1/2 NPT x 1/2 O.D. Elbow, brass or stainless steel  1/4 NPT x 3/8 O.D.

  • Page 19: D200319X012 June

    Instruction Manual 377 Trip Valve D200319X012 June 2017 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 APPLY LUB APPLY LUB GE51600-A...
  • Page 20 Fisher and FIELDUVE are marks owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson Automation Solutions, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective owners.

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