Type S402Y
D101838X012
Instruction Manual
Form 5319
March 2009
www.emersonprocess.com/regulators
Type S402Y Pressure Reducing Regulator
!
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
®
regulators must be installed,
operated, and maintained in accordance
with federal, state, and local codes,
rules and regulations, and
manufacturer’s instructions.
if the regulator vents gas or a leak
develops in the system, service to
the unit may be required. Failure
to correct trouble could result in a
hazardous condition.
Call a gas service person to service
the unit. Only a qualified person must
install or service the regulator.
introduction
This installation manual covers the installation and
startup procedures for Type S402Y pressure
reducing regulators.
The Type S402Y is typically used in residential
or small commercial applications to reduce gas
distribution pressures down to a reduced pressure
range from 4.5-inches w.c. to 2.5 psig (11,0 mbar
to 0,17 bar). The Type S402Y has an integral high
capacity internal relief valve.
Scope of the Manual
This instruction manual provides information on
installation, maintenance, and replacement parts for
Type S402Y pressure-reduction regulators.
Product Description
The Type S402Y is generally employed in residential
or small commercial applications in order to reduce
gas distribution pressures to a specified pressure
range from 4.5-inches w.c. to 2.5 psig (11,0 mbar to
0,17 bar). The Type S402Y has an integral high
capacity internal relief valve.
Specifications
Specifications for Type S402Y construction are found
on page 2. The following information is stamped on
the regulator at the factory: Type number, orifice size,
spring range, and date of manufacture.
Figure 1.
Type S402Y Pressure Reducing Regulator Assembly
