Design Details | Automatic Shutoff Valves
DESIGN DETAILS Top Assembly
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Large, two-color OPEN/SHUT indicator provides easy identification of valve position. Built-in wiring compartment and terminal block eliminates need for external junction box.
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T erminal block includes 12 number-coded positions.
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Auxiliary switches provide DPDT proof-of-open and SPDT "proof-of-closure" to meet insur- ance and approval requirements.
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Good practice dictates that auxiliary switches used in main automatic shutoff valves normally be used for signal duty only.
All 1518 & 1519 (Except 1519- -X)
In a block-and-vent system, blocking valve and normally open vent valve may be powered through the "proof-of-closure" switch of the main automatic shutoff valve; but all three valves must be powered through the appropriate normally open flame relay contact.
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Enclosure meets NEMA 1, 3, 3S, 4 and 12, and CSA 2, 3 and 4 standards (when suitable electrical connections are made).
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Lubrication-free design means minimal maintenance requirements. Field-rotatable top assem- bly provides four positions for complete piping convenience.
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Valves feature solenoid-actuated internal latching mechanism, except 1519- -X which have rack-and-pinion/solid state/magnetic clutch design.
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When a motorized valve is energized, drive motor opens valve in 6 to 12 seconds, dependent on valve size. Valve Body Metal-to-metal seating dœsn’t wear out; it "wears in." Disc wipes valve seat clean during each operation . Rising stem design with straight-through flow reduces pressure drop. Cast iron or cast steel body to meet application requirement.
1519- -X Only
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Built-in over-travel at closed position for positive shut-off.
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Test connections provided both upstream and downstream of valve disc. Accessories Companion Flange Sets (flat-faced) facilitate installation of flanged valves. Order separately. Wheel and Chain assemblies allow operation of manual valves in otherwise in- accessible overhead locations. To order, specify valve with remote reset wheel and chain (2- 8628-1 through -5).
Every valve is operationally tested and meets requirements of ANSI B16.104 Class VI seat leakage when it leaves our plant.
WARNING: Valve leak test should be performed on a quarterly basis to assure continued safe and reliable operation. Each valve should be checked with available line pressure. Absolute zero leakage may not be obtained in the field. Any valve that exceeds the allowable leakage, as set forth by your local codes or insurance requirements (15 bubbles per minute), should be removed from service and your North American representative should be contacted.
Bulletin 1518/1519 Page 3
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