Fisher D450003T012 User Manual
Instruction Manual
MCK-1023
May 1980
Type N201
Type N201
Install, use, and maintain this equipment
according to Fisher instructions and all
federal, state, local laws and codes, and
NFPA Pamphlet 58. Periodic inspection and
maintenance is essential.
Introduction
Type N201 automatic cylinder filling valve is supplied
completely piped up, and consists of a filler valve assembly,
two Type 67 regulators with pressure gauges, a trip valve,
and special parts for alternate scale installations.
Principle of Operation
Refer to Figure 1. Supply pressure registers at
regulators 1 and 2. Pressure from regulator 1 registers
beneath the lower diaphragm of the filler valve, see “A”
in Figure 1. This pressure holds the lower valve closed,
preventing pressure from regulator 2 from registering on
the upper diaphragm. Spring force holds the upper valve
open, and liquid from the charging pump can enter the
cylinder to be filled.
When the cylinder reaches the predetermined weight set on
the scale, the beam button on the scale beam contacts the
trip valve, see “B” in Figure 1. The trip valve opens to exhaust
pressure from under the lower diaphragm. Spring force opens
the lower valve, allowing pressure from regulator 2 to register
on the upper diaphragm. This closes the upper valve, and
stops flow through the orifice. A red button indicates that the
filler valve is closed and that the cylinder is full. Removing the
full cylinder from the scale closes the trip valve and permits
the system to reset itself for the next cylinder.
Installation
Refer to Figure 2.
1. Connect the top 1/2-inch FNPT connection “C” of the
filler valve to the charging manifold.
2. Determine if the trip valve hose is long enough to reach
the scale frame as shown. If not, insert 1/8-inch pipe
as needed.
3. Standard trip valve installation (also see alternate
methods, 3.A and 3.B):
a. The trip valve should be installed at approximately 1/5
of the scale beam length, measured from the pivot point to
FROM CHARGING
PUMP
SCALE
FRAME
REG
# 1
SUPPLY
PRESSURE
A. FILLING CYLINDER
REG
# 1
SUPPLY
PRESSURE
B. FULL CYLINDER
REG
# 2
FILLER
VALVE
FROM CHARGING
PUMP
REG
# 2
FILLER
VALVE
TRIP VALVE
BEAM
BUTTON
SCALE BEAM
SCALE
FRAME
Figure 1. Operational Schematic
the beam stop, see drawing. Although the trip valve can
be installed to operate directly off the scale beam, it is not
recommended because of the side play in most scale beams
can resuIt in failure to contact the trip valve.
b. Drill a 5/8-inch (16 mm) hole through the scale frame
directly above the point on the scale beam, determined in
step 3 (a).
c. Remove locknut “D” and insert trip valve through the
5/8-inch (16 mm) hole. Replace locknut.
d. Place beam button “J” on the scale beam directly
beneath the trip valve.
e. Using locknuts “D” and “E”, position trip valve stem “B”
so that it barely contacts beam button “J” with the scale
beam in a level position, see drawing.
Be certain that the beam button cannot
contact the trip valve housing at point “A”
when the scale beam is in the uppemost
D450003T012
R
www.FISHERregulators.com/lp
Type N201
FROM CHARGING PUMP
PILOT VAPOR
PRESSURE FROM
AIR COMPRESSOR
STORAGE TANK,
OR AUXILIARY
PROPANE CYLINDER
P
K
J
ALTERNATIVE TRIP VALVE
INSTALLATION #1
TYPE 201
FILLER VALVE
I
TRIP VALVE
H
SCALE BEAM
TRIP VALVE
HOSE
C
FILLING HOSE
APPROX. 1/5
LENGTH OF
SCALE BEAM
TRIP VALVE
PIVOT
2
POINT
M
J
SCALE BEAM
1 1/4
(31,8)
SCALE FRAME
H
BEAM STOP
3
(76,2)
MANIFOLD
STANDARD TRIP VALVE
INSTALLATION
F
TRIP
VALVE
B
J
BEAM WHEN CYLINDER
IS NOT FILLED
SCALE
FRAME
E
D
BEAM IN RAISED
POSITION
A
BEAM
HORIZONTAL
(LEVEL)
Figure 2. N201 Installation
position (full cylinder). To correct this, try
raising the trip valve slightly and retighten
locknuts “D” and “E”. If raising the trip valve
does not correct the situation the 5/8-inch
(16 mm) hole on the scale frame will have to
be drilled closer to the pivot point.
3.A On installations where the slide weight “H” must be
moved to zero, alternate trip valve installation no. 1 can be
made. (This is usually necessary when both 20 pounds
(9 kg) and 100 pounds (45,4 kg) cylinders are to be filled.)
Follow steps 3 (a), (b), (c) and:
d. Place the beam button “J” on the scale beam close
enough to the pivot point to allow the slide weight to move to
zero, see drawing. If there is not enough room to permit this,
either the beam button must be ground down or the user
must make a special beam button.
e. Mount beam bar “K” on the beam button so that it extends
directly under the trip valve. The beam bar can be bent if
necessary and extra length can be cut off.
f. Make certain the beam barely contacts the trip valve
stem when the scale beam is in a level position.
L
INCH
(mm)
PIVOT
POINT
ALTERNATE TRIP VALVE INSTALLATION # 2
(FOR TYPE 1124A AND 1280A FAIRBANKS MORSE SCALE)
3.B For Fairbanks Morse Type 1124A and 1280A scales,
alternate trip valve installation no. 2 must be made, see drawing.
a. Measure 3-inch (76,2 mm) from the pivot point as shown.
b. Measure 1 1/4-inch (31,75mm) from the scale frame
center line toward the back of the scale.
c. Drill a 5/8-inch (16 mm) hole through the scale frame
at this point.
d. Attach the beam bar “L” to the clamp “M” with two
screws, and attach the clamp to the rear of the scale beam
with two screws.
e. Remove locknut “D” and insert the trip valve through the
5/8-inch (16 mm) hole. Replace locknut.
f. Using locknut “D” and “E”, position trip valve so that
it barely contacts the beam bar ”L” with the scale in a
level position.
4. Connect supply pressure (air or gas) at point “P”.
Recommended supply pressure is at least 30 psig (2,1 bar),
since regulator 2 is set at 30 psig (2,1 bar) outlet pressure.
A 30 psig (2,1 bar) supply is sufficient for pump discharge
pressures up to 350 psig (24,1 bar). Regulator 1 is set at
3 psig (0,21 bar).
2
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