Figure 1. H200 Series Relief Valve
H200 Series External Relief Valves
▲ WARNING
Failure to follow these instructions or
to properly install and maintain this
equipment could result in an explosion,
fire and/or fire causing property damage
and personal injury or death.
Fisher™ relief valves must be installed,
operated and maintained in accordance
with federal, state and local codes, rules
and regulations and Emerson Process
Management Regulator Technologies Inc.
(Emerson) instructions.
A person should never stand directly
over or in front of or look directly into a
relief valve when the tank is pressurized.
The relief valve could suddenly “pop”
open blowing gas, dirt and other debris
into the person’s face and eyes.
Call a qualified service person to service
the unit. Installation, operation and
maintenance procedures performed
by unqualified person may result
in improper adjustment and unsafe
operation. Either condition may result in
equipment damage or personal injury.
Only a qualified person shall install or
service the relief valve.
Introduction
Scope of the Manual
This manual provides specications, installation,
maintenance instructions and parts ordering
information for the H200 Series.
Only personnel qualied through training or experience
should install, operate and maintain this relief valve. If
there are any questions concerning these instructions,
contact your local Emerson Impact Partner Oce
before proceeding.
Product Description
The H200 Series Pop™ relief valves, Figures 1 and 2,
are self-operated relief valves with preset and pinned
spring retainers. The inlet pressure registers directly
on a spring opposed poppet assembly which includes
a Nitrile (NBR) disk. When the inlet gas pressure
increases above the spring setting, the poppet and disk
assembly is pushed away from the orifice. Springs
are available that provide any relief pressure setting
from 25 to 300 psig / 1.7 to 20.7 bar.
With this simple operation and wide spring setting
selection, the H200 Series Pop relief valves
may be used where venting to atmosphere is
acceptable, where the process gas is compatible
with the Nitrile (NBR) disk, where its relief capacity
is adequate and where some pressure relieving
tolerance is acceptable. Common applications
include use on pneumatic control lines of air drills,
jackhammers and other similar equipment and on
farm tap installations. The H200 Series is comprised
of the Types H202 and H203 relief valves with the
dierence being in the inlet connection size.
Instruction Manual
D104657X012
August 2023
H200 Series
