BT SERIES
THERMAL SHUT-OFF VALVES
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4
OPERATIONS AND MAINTENANCE MANUAL
Models FL-BT-149X
VI. OPERATING THE DECLUTCHABLE MANUAL OVERRIDE GEAR
IMPORTANT: Make sure that the fusible links have been removed before attempting to operate the valve with the
declutchable manual override.
Use the following instructions to
ENGAGE
the declutchable manual override.
1. Using one hand, grab the override engagement handle, squeezing the bottom handle and top handle together.
2. With the handles still squeezed together, rotate the handle from its declutched position upward toward the
spring pack mounting flange until the handle locking tabs are inline with their locking positions.
NOTE: In some cases the override gear teeth will not mesh correctly when rotating the handle upward. If this
occurs, rotate the override handwheel slightly to mesh the gears and then rotate the declutch handle upward.
3. Once the override handle is in its locked position, the override is ready to be used. Clockwise rotation of the
override handwheel will produce clockwise rotation of the override output and valve. Conversely,
counterclockwise rotation of the handwheel will produce counterclockwise rotation of the override output,
and valve.
Use the following instructions to
DISENGAGE
the declutchable manual override.
Note: When the assembly is rearmed with the fusible links back in place, the the manual override must
be returned to its declutched position. Reversing the procedure above will return the override to the declutched
position. Make sure that the handle locking tabs are inserted into their locking position on the override housing.
Leaving the declutch engaged will prohibit the spring return unit from cycling the valve to the closed position when the
fusible links yield. Leaving the unit in the engaged position will prevent the unit from operating correctly, may cause
damage to the override as well as drivers linkages, etc. and void the override warranty.
IMPORTANT: The fusible links will have to be reinstalled and the declutch disengaged before the assembly is properly
armed.
The picture on the left shows the declutch operator in the disengaged
to allow the spring pack to close the valve when the fusible links yield.
As shown, the handle arrangement is pinned in the down position. The
handwheel should rotate freely in either the clockwise or counterclockwise
directions without affecting the valve rotation.
The picture on the left shows the declutch in the “override” position, or
“engaged,” for operating the valve manually. As shown, the handle ar-
rangement is pinned in the up position for override. Rotation of the hand-
wheel clockwise will rotate valve clockwise (generally closed
direction); rotation of the handwheel counter-clockwise will rotate actua-
tor counterclockwise (generally open).
IMPORTANT: FUSIBLE LINKS MUST BE REMOVED BEFORE ATTEMPTING TO
OPERATE THE VALVE WITH THE DECLUTCH.
DISENGAGED
ENGAGED
