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Emergency shutoff valve


Snappy Joe Emergency Shutoff Valves for
Bulk Plants ®

Snappy Joe Type N550 Emergency Shutoff Valves (ESVs) are
designed for in-line installations, usually near a bulkhead. The
valves provide a means of shutting off gas in the event of a hose
rupture or piping break at the transfer area to avoid a large scale
loss of LP-Gas or NH .3

The valves can be manually opened and closed at the installed
location or closed remotely by either cable or air. A remote
operating actuator is also available.

High Flow Capacity – The main poppet moves completely out of
the flow stream for extremely low restriction-to-flow.

Operational Ease – Moving the operating lever to the vertical
position opens the valve, making it simple to tell if the unit is open
or closed. A pilot valve in the poppet opens as the lever is moved
upward to pressurize the hose. Once equalized, the poppet
moves quickly to the open position.

The valve is closed by simply pushing the lever down without first
having to trip a latch. The operating lever is easily reached from
across a bulkhead. All sizes look similar and operate exactly the
same, an important point in an emergency situation.

Fusible Element – The fusible element is located at the hub of
the operating lever and stub shaft. When exposed to fire, the
element melts allowing the stub shaft to turn. The poppet then
moves to the closed position, even if the operating lever has been
wired open.

Rugged Construction – Heavy duty construction makes Snappy®

Joe ESVs suitable for use as a “working” shutoff valve for the
transfer area, even under frequent use. The internal closing
spring is protected from the elements and tampering. All seats
and seals use metal back-up seals for extended fire resistance.
The valves are rated 400 WOG.

Ease of Service – Serviceable without removal from the pipeline.
Parts that wear are external and can be changed out in a matter
of minutes. The packing can be changed with the valve in-line.

Cable Release – Standard valves are fitted with a release
mechanism for cable attachment. A cable connected to the wire
loop allows closure from a safe remote location, such as the bulk
plant entrance.

While the ordinary cable can be used, the Type P164B release
assembly is available. This assembly uses 50’ (15 meters) of
cable housing which does not require elaborate guiding like
uncovered cables.

Pneumatic Operation – Remote pneumatic closure is available
with Type P327D release. Depending upon valve inlet pressure,
a minimum supply pressure of 30 to 70 psig (2,07 to 4,83 bar) on
the P327D allows the valve to be latched in the open position with
manual closure possible at the valve. Loss of supply pressure to
the cylinder permits the ESV to close. Air, nitrogen, or CO can be
2 used for the cylinder supply source. Maximum inlet pressure to
the cylinder is 125 psig (8,6 bar). Operating Temperature Range =
-40°F to 212°F (-40° to 100°C).

Opening and closing of Snappy Joe ESVs from a remote location
can be done by using Type P327C air cylinder. Depending upon
valve inlet pressure, a minimum supply pressure of 30 to 70 psig
(2,07 - 4,83 bar) to the cylinder opens the valve. Air, nitrogen,
or CO can be used for the cylinder supply source. Maximum
2 inlet pressure to the cylinder is 125 psig (8,6 bar). Operating
Temperature Range = -65°F to 225°F (-54°C to 107°C).

Upon loss of pressure, the valve closes, assisted by the spring
in the pneumatic cylinder. All necessary installation hardware for
the P327C is furnished.

Fisher makes available a small 3-way control valve (T1139599012)
for pneumatic ESV installation. This control valve can be used as
primary control (open or close the ESV) or an auxiliary remote
release (close only).

Placing the valve’s button in the upward position permits pressure
to the cylinder. Pushing the button down exhausts pressure to
close all valves connected to the system.





Railroad Tank Cars

Snappy Joe Type N562 Emergency Shutoff Valves (ESVs)
are designed for railcar protection and attach to the shutoff
valves on railroad tank cars (refer to installation drawing).
Typically three N562s are used – two on the liquid lines and
one on the vapor line. NFPA 58 regulations call for ESV
protection on both sides of the transfer hose or piping.

Pneumatically operated, the valve is opened and closed by
means of a standard quick-disconnect coupling (furnished).
Approximately 20 to 60 psig (1,38 to 4,14 bar) is needed to
open the valve, depending upon tank car pressure.

Remote closure from one or more points, such as the unloading
riser, is accomplished by exhausting pressure from the valve’s
piston chamber with a pneumatic control valve.

Application Flexibility/Field Serviceability – The N562 has
a 2” NPT female coupling. Nipple lengths attached to the 2”
NPT coupling are field selectable based on specific application
requirements i.e. the size of the tank dome opening. These
field-installed nipples can be easily secured and replaced.

Wrenching Hex – A wrenching hex is built into the body
and nipple preventing wear or damage when connecting or
disconnecting. A 1/4” FNPT opening in the hex portion can be
used to install a bleed valve.
Hardened Threads – The 2” FNPT threads on the nipple
portion are of hardened stainless steel to reduce wear from
repeated use.

Excess Flow Valve – With a poppet design similar to Fisher’s
internal valve series, an excess flow spring is available. The
spring has a closing flow of 200 GPM propane at 13 psid.
Dual Service – With all internal parts either stainless steel
or plated steel, the valve can be used on NH service as well
as LP-Gas.