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Fisher® 377 Trip Valve

Fisher® 377 Trip Valve
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Instruction Manual Fisherr 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 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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Instruction Manual Figure 2. Typical Fisher 377 Trip Valve Figure 3. Simplified Sectional View of Trip Valve UPPER DIAPHRAGM VALVE PLUG SPRING EXHAUST PORT SUPPLY CONNECTION LOWER DIAPHRAGM PORT D PLUG ASSEMBLIES 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 Phone: +1- 641-754-3771 or +1-800-338-8158 e‐mail: education@emerson.com http://www.emersonprocess.com/education

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Instruction Manual Table 1. Specifications Pressure Connections 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...

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Instruction Manual Table 1. Specifications (continued) 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 to indicate compliance with other applicable European Community Directives. 1. The pressure/temperature limits in this document and any applicable standard or code limitation...

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Instruction Manual If the 377 trip valve is shipped separately from the control valve assembly, the installation procedure depends upon the type of actuator and accessory equipment required for the individual control valve system. Install any accessory equipment in the control valve system so that the overall functioning of the specified trip valve pressure line connections is not disrupted. Figures 7, 8, and 9 are schematics showing the pressure line connections for each of the three possible fail‐mode configurations of the trip valve. CAUTION 377 trip valves are leak tested to ensure that...

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Instruction Manual Figure 6. Fisher 2625 Volume Booster used with 377L Trip Valve INPUT SIGNAL 1/2 O.D. TUBING 2625 3/4 NPT OR 1/2 NPT PIPING PISTON ACTUATOR POSITIONER 3/4 NPT CHECK VALVE 3/4 NPT OR 1/2 NPT PIPING NOTES: 1. 3/4 NPT CHECK VALVE AND 1/2 OR 3/4 NPT PIPING ARE REQUIRED. 2. 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 PROCESS MANAGEMENT SALES...

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