Cable Hook-Ups - Fisher N551 Instruction Manual

HOSE CONNECTION
T20874
Fusible Element Location
A fusible element that will close the Type N551 shall be located
within five feet of the hose connection. If the Type N551 is placed
within five feet of the hose connection, this requirement is met.
If not, an additional fusible element must be provided near the
hose coupling which will activate a remote release.
Remote Release Installation
In all installations a remote release shall be connected to the
latch on all emergency valves at the bulkhead. The remote
release has to extend to a place where it can be easily reached
to close the Type N551 valve(s) in the event that an emergency
makes the valve(s) inaccessible. The remote release shall
shutdown all emergency valves when activated. Remote
release activation may be by cable or pneumatic hook-up.

Cable Hook-Ups

!
Remote release cables shall be installed so
that they will close the Type N551 valve(s)
when pulled from the farthest remote location.
Cable shall operate smoothly, over pulleys
and/or through conduit. Do not kink cable or
run cable around sharp corners. If installed
in conduit, keep water out of conduit. Frozen
water, dirt or dried mud in the conduit will
render the remote release inoperable.
Remote releases used on Type N551 valve
shall not:
(a) be made from plastic or fiber rope;
(b) have any kind of fusible link which could
melt and prevent the cable from pulling
the Type N551 latch.
HOSE CONNECTION
12 / 305
OR MORE
Figure 2. Typical Installation of Type N551 Using Remote Cable Release
WARNING
Types N551 and N851
NAMEPLATE UP
EMERGENCY SHUTOFF
VALVE TYPE N551
FIXED PIPING
To provide a remote release, aircraft cable can be connected
to the short looped cable on the valve and run to the remote
release point over pulleys or through conduit. Adjust the cable
so that minimal pull is required to close the emergency valves.
Type P164B Cable Installation
To connect a Type P164B remote release assembly, which is
supplied with 50 ft. / 15 m of cable:
1. Run the inner cable and housing assembly to the
remote release point. Leave enough slack on each end
for a smooth, flowing path, without sharp bends in the
cable, between the Type N551 latch block and remote
release handle.
2. If it is necessary to cut the cable to a shorter length,
pull about one foot of inner cable from the Type N551
latch block cable end (end with the 3/16 x 1/2 in. / 4.8
x 13 mm long cylindrical cast fitting, see Figure 3) from
the housing.
At the remote release end (other end of inner
cablehousing assembly), cut the housing and inner
cable at desired length. Push the excess inner cable
back through the housing so that the bare cable extends
from the remote release end.
3. Close the Type N551 valve. Handle parallel to pipe.
4. If necessary for additional working space, remove the long
end of the external spring from under the latch block. DO
NOT REMOVE SPRING FROM HANDLE.
5. Loosen the slotted screw, Figure 3, on the Type N551
valve's latch block until the plunger can be pulled from
the latch block.
6. Disconnect the short looped cable and remove it.
7. Insert the Type P164B inner cable end cylindrical cast
fitting through the latch block rear conical hole and connect
the cylindrical cast fitting into the side slot in the plunger.
REMOTE CABLE TO
SAFE LOCATION
In. / mm
3