BT SERIES
THERMAL SHUT-OFF VALVES
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2
OPERATIONS AND MAINTENANCE MANUAL
Models FL-BT-149X
III. INSTALLING FUSIBLE LINKS ON THE BT SERIES ASSEMBLY
NOTE:THE VALVES ARE SHIPPED IN THE CLOSED POSITION AND UNARMED AND MUST BE MOVED TO THE OPEN
POSITION AND ARMED TO BE FUNCTIONAL.
FOR NEWLY INSTALLED AND UNARMED ASSEMBLY
REQUIRED TOOLS: 9/16” and 1/2” open-ended wrenches to install nuts (varies with spring pack) NOTE: INSTALL VALVE
IN PIPELINE BEFORE PROCEEDING!
1. Move locking trigger (#12) away from spring pack tripper plate (#11) prior to opening valve.
2. With declutchable manual override gear in the engaged positon, open valve with the handwheel. Turn the declutch
gear handwheel toward the open position (CCW) until it stops. CAUTION: Keep declutch in engaged position.
3. After valve has been opened, swing locking trigger (#12) into position as shown on illustration FL-HT-0600-1.1 on
page 3.
4. Remove hardware on locking trigger ( #12) and secure fusible links to through holes on spring pack arming
device (#7). IMPORTANT: Keep fusible links (#10) straight and in line while attaching to trigger (#12). DO NOT
OVERTIGHTEN.
5. Adjust rod end nuts on retaining rods (#9) until a slight tension on the links is felt. DO NOT OVERTIGHTEN.
6. With declutch engaged, turn declutch handwheel clockwise (CW) until spring tension is held by links. Disengage
declutch mechanism according to instructions on page 4. DO NOT FORCE INTO POSITION. The unit is now armed.
IMPORTANT: THE UNIT IS NOT ARMED UNTIL THE GEAR HAS BEEN PLACED IN THE DISENGAGED POSITION AFTER
INSTALLATION OF LINKS. IF THE GEAR IS LEFT IN THE ENGAGED POSITION THE VALVE WILL NOT SPRING CLOSE.
IV. OPERATION
Once the unit is properly armed, the valve may be operated closed-open in the normal manner using the declutchable
gear handwheel upon removal of the fusible links (reverse “Installation” instructions above). The gear lever must
always be returned to the DISENGAGED position after manually operating the valve and the links must be put back into
place. Failure to return the gear to the disengaged position will lock the gear and valve into position, and the fusible
link assembly will not function properly.
IMPORTANT: THE FUSIBLE LINKS MUST BE RETURNED TO THE ARMED AND INSTALLED POSITION AFTER MANUAL
OPERATION!
PRE-ARMING CHECK LIST
•
Is valve installed in line securely?
•
Is Declutch gear override in the engaged position? (see page 4)
•
Is the valve in the closed position?
If the items in the checklist all can be answered “YES”, proceed with arming the assembly.
