Emerson Fisher 377 Instruction Manual

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www.Fisher.com
Fisher
r
377 Trip Valve
Contents
Introduction 1.................................
Scope of Manual 1.............................
Description 1.................................
Specifications 2...............................
Educational Services 2.........................
Installation 4..................................
Supply Pressure Requirements 6.................
Operating Information 8.........................
Calibration 8.................................
Principle of Operation 9.........................
377D Trip Valve 9.............................
377L Trip Valve 10.............................
377U Trip Valve 11............................
Maintenance 12................................
Periodic Operational Check 13...................
Trip Valve Part Replacement Procedures 13........
Replacing Diaphragms and Valve Plug Parts 13.....
Replacing Stem/Plug Assembly Parts 14...........
Parts Ordering 15...............................
Parts Kits 15...................................
Parts List 15...................................
Figure 1. Fisher 377 Trip Valve Mounted on Size 130
585C Actuator
W8435‐1
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.
Instruction Manual
D200319X012
377 Trip Valve
July 2014
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Summary of Contents

Page 1 - 377 Trip Valve

www.Fisher.comFisherr 377 Trip ValveContentsIntroduction 1...Scope of Manual 1...Description 1

Page 2 - Educational Services

Instruction ManualD200319X012377 Trip ValveJuly 201410GE08412‐AA6905‐1Figure 7. Fisher 377D Trip Valve Shown in Tripped ConditionSPRINGVALVE PLUGUPPER

Page 3

Instruction ManualD200319X012377 Trip ValveJuly 201411Figure 8. Fisher 377L Trip Valve Shown in Tripped ConditionSPRINGVALVE PLUGUPPER DIAPHRAGMEXHAUS

Page 4 - Installation

Instruction ManualD200319X012377 Trip ValveJuly 201412Figure 9. Fisher 377U Trip Valve Shown in Tripped ConditionSPRINGVALVE PLUGUPPER DIAPHRAGMEXHAUS

Page 5

Instruction ManualD200319X012377 Trip ValveJuly 201413D Disconnect any operating lines providing air pressure, electric power, or a control signal to

Page 6 - Supply Pressure Requirements

Instruction ManualD200319X012377 Trip ValveJuly 2014141. Remove the adjusting screw cap (key 1), and loosen the hex nut (key 3) that locks the set sc

Page 7 - WARNING

Instruction ManualD200319X012377 Trip ValveJuly 201415Parts OrderingWhen corresponding with your Emerson Process Management sales office about this eq

Page 8 - Operating Information

Instruction ManualD200319X012377 Trip ValveJuly 201416Table 2. Common Parts (continued)KEYNUMBERDESCRIPTIONQUANTITYREQUIREDPART MATERIALTrip Valve Con

Page 9 - Principle of Operation

Instruction ManualD200319X012377 Trip ValveJuly 201417Table 2. Common Parts (continued)KEYNUMBERDESCRIPTIONQUANTITYREQUIREDPART MATERIALTrip Valve Con

Page 10 - 377L Trip Valve

Instruction ManualD200319X012377 Trip ValveJuly 201418Table 2. Common Parts (continued)KEYNUMBERDESCRIPTIONQUANTITYREQUIREDPART MATERIALTrip Valve Con

Page 11 - 377U Trip Valve

Instruction ManualD200319X012377 Trip ValveJuly 201419Figure 10. Trip Valve Assembly APPLY LUB49A3195-CNOTE: KEY NUMBERS 7, 20, 64, 65, 76, 78, 79,

Page 12 - Maintenance

Instruction ManualD200319X012377 Trip ValveJuly 20142Figure 2. Typical Fisher 377 Trip ValveW4292-1Figure 3. Simplified Sectional View of Trip ValveUP

Page 13 - Periodic Operational Check

Instruction ManualD200319X012377 Trip ValveJuly 201420Emerson Process Management Marshalltown, Iowa 50158 USASorocaba, 18087 BrazilChatham, Kent ME4 4

Page 14 - Instruction Manual

Instruction ManualD200319X012377 Trip ValveJuly 20143Table 1. SpecificationsAvailable Configurations377 Trip Valve: Includes check valve, but no volum

Page 15 - Parts List

Instruction ManualD200319X012377 Trip ValveJuly 20144Table 1. Specifications (continued)Declaration of SEPFisher Controls International LLC declares t

Page 16

Instruction ManualD200319X012377 Trip ValveJuly 20145If the 377 trip valve is shipped separately from the control valve assembly, the installation pro

Page 17

Instruction ManualD200319X012377 Trip ValveJuly 20146Figure 6. Fisher 2625 Volume Booster used with 377L Trip Valve26251/2 O.D. TUBINGPISTONACTUATORPO

Page 18 - Fittings

Instruction ManualD200319X012377 Trip ValveJuly 20147NoteDuring normal operation, an adequately sized supply regulator maintains a greater supply pres

Page 19

Instruction ManualD200319X012377 Trip ValveJuly 20148CAUTIONTo ensure the integrity of control systems utilizing a 2625 volume booster in conjunction

Page 20

Instruction ManualD200319X012377 Trip ValveJuly 201491. Remove the adjusting screw cap (key 1).2. Loosen the hex nut (key 3), and turn the set screw

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