Type N550 Snappy Joe
®
Emergency
Shutoff Valves
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 Emerson Process
Management Regulator Technologies,
Inc., 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 LP-Gas or anhydrous
ammonia industries should install and
service this equipment.
Introduction
Scope of the Manual
This manual provides installation and maintenance
instruction for the Type N550 Emergency Shutoff
Valves and Accessories.
Description
Type N550 Snappy Joe
®
(Figure 1) emergency shutoff
valves are intended for in-line use on LP-Gas or
Anhydrous Ammonia (NH
3
) service.
The valves may be installed on both ends of transfer
hoses where the hose connects the bulk plant piping
to the bobtail, transport, or tank car. They provide
a quick way of shutting off gas flow in the event of
a hose rupture and meet the requirements for such
service when correctly installed with a remote release
and proper piping support. The Type N550 valves are
lever operated, latch-open, and quick closing valves.
A fusible element in the latch melts if the temperature
reaches 212°F (100°C), allowing the valve to close.
The following accessories are also covered:
Type P164B – Cable Release Assembly.
Type P327D – Remote Pneumatic Release Assembly.
Specifications
The Specifications table lists specifications for the
Type N550 valve which is designed for butane,
propane, or NH
3
service at ambient temperatures.
Contact your local distributor if the valve is to be
used on any other service, fluid, compressed gas,
or temperature condition.
Figure 1.
Type N550 in Closed Position
!
WARNING
Instruction Manual
D450040T012
March 2010
Type N550
