289P-6365 Instruction Manual

Page 1

Type 289P-6365

Fisher Controls

Instruction Manual

Type 289P-6365 Pilot-Operated Relief Valve

June 1990

Form 5120

Introduction Scope of Manual This manual describes and provides installation, maintenance and parts information for the Type 289P6365 pilot-operated pressure relief valve. Information for any other Fisher equipment used with this relief valve is found in separate manuals.

Description

Specifications Table 1 lists Type 289P-6365 relief valve specifications. Some specifications, such as spring ranges and maximum inlet and outlet pressures, for the relief valve are stamped on the main valve closing cap and pilot spring case (figure 2).

Installation WARNING The pilot could break off the main valve, the relief valve could develop a leak, or the installation could be in violation of local,

ŠFisher Controls International, Inc., 1980, 1990; All Rights Reserved

W3167-2

Figure 1. Type 289P-6365 Pilot-Operated Relief Valve state, and Federal codes and regulations. Any of these may result in personal injury or property damage due to bursting of pressure-containing parts or explosion of accumulated gas. Install a relief valve in a safe location, isolate the valve and call qualified help in case of leaks, and check that the installation is in compliance with all applicable codes and regulations. Use qualified personnel when installing, maintaining, or operating this relief valve. Before installing, inspect the main valve and pilot for any damage and for the presence of any foreign material in the main valve body. Make sure that the valve is oriented so that pipeline flow is in the same direction as the arrow on the side of the main valve body. Use pipe compound on the pipe threads, but do not apply the pipe compound to the internal body threads.

D100281X012

The Type 289P-6365 pilot-operated pressure relief valve is used to provide protection from overpressuring a downstream system. This relief valve is suitable for service on natural gas, air, propane, water, light oils, and other fluids and gases compatible with the internal parts. A high-gain version of the Type 6365 pilot is used for gas service. A low gain pilot version is used for liquid service. The external control line provides quick, accurate pressure registration resulting in very little buildup over the set pressure before the main valve opens wide for maximum relief capacity.


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