Fisher N551 Instruction Manual page 5

5/32 / 4 ALLEN HEAD
WRENCH REQUIRED
T40337
4. Use a 5/32 in. / 4 mm Allen head wrench to screw
1/4 in. / 6.4 mm long bolt into bottom hole.
5. Tighten until bolt head seats firmly on body.
6. Place latch block on body with lower blind hole over bolt
in body.
7. Install 3/4 in. / 19 mm long bolt through second hole and
firmly tighten with 5/32 in. / 4 mm Allen head wrench.
8. Refasten long end of spring under latch block by
ROTATING 180 DEGREES CLOCKWISE.
9. Attach the remote air source to the cylinder end with
appropriate supply tubing and valving. A regulated
air supply of 30 to 70 psig / 2.1 to 4.8 bar to the
Type P327D pneumatic release cylinder is required for
proper operation.
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.
10. Test the remote release and Type N551 operation.
Rotate handle counter clockwise to open valve. Valve
must stay open. HANDLE AND VALVE MUST QUICKLY
"SNAP" CLOSED when (a) air pressure is exhausted
from Type P327D pneumatic remote release and (b) the
handle is pushed closed from the open position.
TO HOSE
5/32 / 4 ALLEN HEAD
WRENCH REQUIRED
Figure 4. Type P327D Pneumatic Cylinder Installation
CAUTION
Types N551 and N851
NAMEPLATE
AIR SOURCE – 1/8 NPT
All open Type N551 Emergency Valve(s)
attached to the remote pneumatic release
system must properly close when air
pressure is exhausted from the system.
Remote release controls must quickly
exhaust pressure from the supply line to
close emergency valves.
Optional Motion Release Cable
With either the cable or pneumatic remote release hook-
ups, it is possible to connect an additional cable from the
Type N551's operating handle to the truck along the transfer
hose(s). This cable would close the valve if the hose(s) is
stretched (driver does not disconnect) beyond a preselected
limit. The hook-up does not affect the normal operation of
the valve.
Motion Release Cable Installation
1. Connect a suitable release cable such as stainless steel
aircraft cable to a standard "S" hook. Attach the "S" hook
to the Type N551 handle as shown in Figure 5.
2. The cable should run through the bulkhead just below
and to the side of the pipe. The cable should be in line
with the operating lever, refer to Figure 5.
TO TANK
In. / mm
WARNING
!
5