Fisher N551 Instruction Manual page 4

Types N551 and N851
CLAMP
TYPE N551
LATCH
BLOCK END
CABLE
HOUSING NUT
8. Replace the plunger in the latch block, oriented so the
screw will enter the plunger slot. Tighten the screw.
9. The end of the cable housing and cable housing nut fit
into the conical end of the latch block. Pulling the excess
inner cable through the housing from the remote release
end will hold the housing in the latch block.
10. Mount the remote release cylinder assembly to a
suitable support at the remote release location (7/16 in. /
11 mm diameter mounting hole) but do not tighten the
mounting nut.
11. At the remote release end, strip about 3/4 in. / 19 mm of
vinyl cover from the cable housing end.
12. Insert the inner cable completely through the release
cylinder. Screw the bare cable housing end into the
remote release cylinder by rotating the cylinder. Tighten
the mounting nut.
13. Pull any slack from the inner cable, just tight enough so
that the latch is not activated, and cut the inner cable
off 1 in. / 25 mm past the remote release cylinder end.
14. Insert the 1 in. / 25 mm bare inner cable into the remote
release handle shaft. Push the remote release handle
completely into the remote release cylinder. Tighten
the handle set screw to secure the handle to the
inner cable.
Possible hand and finger pinch point
between closing Type N551 handle and
latch block. Handle closes quickly and with
extreme force. Keep hands and fingers away
from handle as it closes.
4
REMOTE RELEASE END
CLAMP
3/16 x 1/2 / 4.8 x 13
CYLINDRICAL
CAST FITTING
PLUNGER
SLOTTED PLUNGER SCREW
Figure 3. Type P164B Cable Release Installation Schematic
CAUTION
MOUNTING NUT
15. Test the remote release and Type N551 operation
from the most remote location. Rotate handle
counterclockwise to open valve. Valve must stay
open. HANDLE AND VALVE MUST QUICKLY "SNAP"
CLOSED when (a) the remote release cable is pulled and
(b) handle is pushed closed from the open position.
!
All open Type N551 emergency valve(s)
attached to the remote release must properly
close when the release cable is pulled.
Pneumatic Hook-Up
Type P327D Pneumatic Release
Block Installation
If several valves are installed at the same location, remote
release may be accomplished with the Type P327D pneumatic
release block which replaces the cable latch block installed on
the Type N551 valve.
To install the Type P327D, see Figure 4:
1. Close the Type N551 valve. Handle is parallel to
the pipe.
2. Remove the long end of the external spring from
under the latch block. DO NOT REMOVE SPRING
FROM HANDLE.
3. Remove latch bolt(s). Older valves will have 2 bolts.
DISCARD CABLE LATCH BLOCK.
1 / 25
HANDLE
SET
SCREW
REMOTE RELEASE CYLINDER
In. / mm
WARNING