N551-16

• Body Size: 2" FNPT


• LP-Gas Flow Rate: 295 GPM @ 2 psid


• NH3 Flow Rate: 258 GPM @ 2 psid

LP-Gas & NH3 Flow Rates @ 2 PSI Differential

Snappy Joe™ Emergency Shutoff Valves for Bulk Plants

Snappy Joe Type N551 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 LPG or Anhydrous Ammonia (NH3).

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 UL®-approved materials rated for -40°F / -40°C and have metal back-up seals for extended fire resistance. The valves are rated 400 psig / 27.6 bar 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.

Type N851 Series for Special Service

The Type N551 Series can be ordered with alternate elastomer compounds for various industrial process applications. The Type N851K is assembled with FFKM (Kalrez® or equivalent) and can be used in a variety of fluid services. Other materials may be available. Contact your salesman for more details.

Old Part Number N550-16.