North American Shutoff Valves Installation, Operation & Maintenance Instructions
Instructions 1517
OVERVIEW
North American Automatic Shutoff Valves are used in fuel sup- ply lines on industrial furnaces, ovens, kilns, boilers, and other heating equipment. They shut off fuel automatically and instantly upon any break in electric power or the safety circuit. They cannot be opened until an interlocking safety or control circuit is complete, restoring power to the valve.
Valves are tolerant of adverse ambient conditions; but, and as with any other electrical/mechanical equipment, try to select a location that is cool, clean, and dry. Exposed metal surfaces of valve are aluminum, cast iron, or cast steel--all painted. Cover gasketing material is Neoprene, or equal. Any substance in the atmosphere surrounding the valve which is harmful to these materials will have an adverse effect upon the valve exterior. Pressure Limitations: Observe nameplate pressure ratings. If inlet pressure to associated oil pressure regulator is greater than that for which valve is catalog-rating, additional protection in the form of a pressure relief valve and/or two-stage pressure regulation should be provided. Temperature Limitations: Refer to catalog or nameplate for specific limitations of valve. Shield valve from heat (including severe solar or radiant exposure) if necessary. Do not expect normal valve operation at ambients below freezing if there is excessive moisture in the oil, or if water has been permitted to enter top assembly through, for example, a conduit connec- tion. Piping the Valve: Body is unidirectional and must be oriented in line so that flow through valve agrees with body marking. Field-rotate top assembly if necessary; see TOP ASSEMBLY ROTA- TION for instructions. Use of Teflon tape (if approved locally) increases possibility of thread over-engagement. Use caution, since even steel valve bodies can be cracked under these conditions. Good piping practice dictates that piping be independently sup- ported so valve bodies are not placed in a bind.
They can be suitable for pipe lines carrying a variety of liquids used in processes other than combustion.
Specify 1517 Motorized Valves where remote or "un-manned" opening is needed. (Offered in ½" through 1¼" pipe sizes.)
1517 Valves are for emergency automatic shutdown only--follow- ing any shutdown, close manual shutoff valves promptly.
INSTALLATION INSTRUCTIONS
General Considerations: Motorized valves open unattended upon being powered, but manual reset valves should be located so operator is encouraged to observe main flame igni- tion after opening valve. Time lag between valve action and flame response is reduced when valve is located near burner, reducing length and storage capacity of downstream piping. Valves are usually installed upright in horizontal piping. Other orientations are acceptable subject to the conditions outlined below: Mount valve so that open/shut window indicator will be visible to your operating personnel. The open/shut window indicator should never face upward. With electro- mechanical top assemblies, the motor access side plate should always be vertical to the ground. Valves are usually installed in horizontal piping; however, other orientations are acceptable, subject to the above limitations. The top assemblies of all valves are field rotatable to allow installations involving conflicts with these mounting restrictions.
Clear fuel line of foreign matter such as line scale, welding beads, metal cuttings, etc.
Testing Piping: Follow applicable codes, but, to avoid damage to valve internal components, DO NOT USE WATER as a test medium.
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