Type 289P
D102680X012
Instruction Manual
Form 5481
February 2009
www.emersonprocess.com/regulators
Type 289P Pilot-Operated Relief Valve
Introduction
Scope of Manual
This manual describes and provides instructions
and parts lists for the Type 289P pilot-operated relief
valve. Instructions and parts lists for any other Fisher
®
equipment used with this relief valve will be found in
separate manuals.
Product Description
The Type 289P pilot-operated relief valve is used to
provide protection from overpressuring a downstream
system. This relief valve is suitable for service on
natural gas, air, propane, or any other operating
medium not corrosive to the internal parts. Smooth
opening action minimizes system pressure surges
during emergency action. Very little build-up over set
pressure is required to completely open the main valve
for maximum relief capacity. The external control line
provides quick, accurate pressure registration.
Specications
Some of the specications for a given relief valve as
it comes from the factory appear on the nameplate
attached to the Type 289P main valve spring case.
Other specications appear on the Type 6358B or
6365 pilot spring case.
Figure 1. NPS 1 Type 289P Pilot-Operated Relief Valve Figure 2. NPS 2 Type 289P Pilot-Operated Relief Valve
W6834
W3167-2
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