G100 Series
D450017T012
Instruction Manual
MCK-1095
September 2015
www.fisherregulators.com
G100 Series Back Check Valves
trucks. Because the valves give tight shutoff, piping on
the bobtail can be blown down easily for maintenance or
repair without experiencing leakage.
Installation
CAUTION
If the valve is to be used in service other than
LPG or anhydrous ammonia, contact the
factory to determine if the valve materials are
suitable for the particular service.
Flow through the back check valve must
be in the same direction as the flow arrow
stamped on the valve.
!
WARNING
Failure to follow these instructions or to
properly install and maintain this equipment
could result in an explosion and/or fire causing
property damage and personal injury or death.
Fisher
®
equipment must be installed, operated,
and maintained in accordance with federal,
state, and local codes and manufacturer’s
instructions. The installation in most states
must also comply with NFPA No. 58 or ANSI
K61.1 standards.
Only personnel trained in the proper
procedures, codes, standards, and regulations
of the LPG industry should install and service
this equipment.
Introduction
Scope of the Manual
This instruction manual covers installation and maintenance
for Fisher G100 Series Back Check Valves used on LPG
and anhydrous ammonia.
Description
Back check valves are normally closed valves that allow
flow in only one direction. When flow, in the direction
of the arrow starts, the valve poppet opens. When
flow stops or reverses, the valve poppet closes. Back
check valves are installed in liquid filling connections on
stationary storage tanks and bobtail delivery trucks, as
well as liquid transfer lines. The valves are frequently
used in conjunction with globe and angle valves or large
single-check filler valves.
Two styles of seat construction are available: soft
seat or metal-to-metal. The soft-seated construction is
intended for the filling connection on bobtail delivery
Figure 1. G100 Series Back Check Valves
(Arrow indicates direction of flow)
G100 SERIES
G105 SERIES
P1039
P1038
