Type H800
D100405X012
Instruction Manual
Form 5187
March 2009
www.emersonprocess.com/regulators
Type H800 Relief Valve
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WaRning
Failure to follow these instructions or to
properly install and maintain this equipment
could result in an explosion, fire and/or
chemical contamination 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 manufacturer’s instructions.
if a leak develops or if the outlet continually
vents gas, service to the unit may be required.
Failure to correct trouble could result in a
hazardous condition. Only a qualified person
must install or service the unit
installation, operation, and maintenance
procedures performed by unqualified personnel
may result in improper adjustment and unsafe
operation. Either condition may result in
equipment damage or personal injury. Use
qualified personnel when installing, operating,
and maintaining the Type H800 relief valve.
introduction
Scope of the Manual
This manual provides installation, maintenance, and parts
ordering information for the Type H800 relief valve. Information
for other equipment used with this relief valve is contained in
separate manuals.
Product Description
The Type H800 relief valve
(1)
(See Figure 1) is a compact,
Direct-Operated relief valve. It is used primarily between a
pneumatic instrument and its supply pressure regulator to limit
the instrument supply pressure to 50 psig (3,4 bar) should
the supply pressure regulator fail open. The Type H800 relief
valve can also be mounted on other equipment, such as an air
compressor, where limited relief capacity is desired.
Specifications
Specifications for the Type H800 relief valve are given on
page 2. Additional specifications for 67 Series regulators used
with Type H800 relief valves are shown in Table 1.
installation
Upon receipt, inspect the relief valve to be sure it is free of
foreign material.
!
WaRning
installing a Type H800 relief valve where its
capabilities can be exceeded or where proper
operation might be impaired may cause
personal injury, property damage, or leakage
due to bursting of pressure-containing parts or
explosion of accumulated gas. To avoid such
conditions, install a Type H800 relief valve where:
• Service conditions are within the unit
capabilities are specified in specifications
section and Table 1, and
• The relief valve is protected from
exposure to physical damage and/or
corrosive substances.
W3618
Figure 1.
Type H800 Relief Valve
1. Relief valve defined in ANSI Standard B95.1-1972. Not all codes or regulations permit these valves to be used as final overpressure protection devices.
