Instruction Manual
MCK-1023
Type N201
May 1980
FROM CHARGING
PUMP
Type N201
SCALE
FRAME
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.
REG
# 2
TRIP VALVE
BEAM
BUTTON
REG
# 1
SCALE BEAM
SUPPLY
PRESSURE
FILLER
VALVE
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.
A. FILLING CYLINDER
FROM CHARGING
PUMP
SCALE
FRAME
Principle of Operation
REG
# 2
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.
REG
# 1
SUPPLY
PRESSURE
FILLER
VALVE
B. FULL CYLINDER
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.
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).
Installation
c. Remove locknut “D” and insert trip valve through the
5/8-inch (16 mm) hole. Replace locknut.
Refer to Figure 2.
d. Place beam button “J” on the scale beam directly
beneath the trip valve.
1. Connect the top 1/2-inch FNPT connection “C” of the
filler valve to the charging manifold.
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.
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):
Be certain that the beam button cannot
contact the trip valve housing at point “A”
when the scale beam is in the uppemost
a. The trip valve should be installed at approximately 1/5
of the scale beam length, measured from the pivot point to
R
Type N201
the operator should immediately close the
Note
hose shutoff valve when the scale beam
contacts the trip valve stem. If the scales
are balanced after the additional spurt, the
operator should wait for this before closing
the hose shutoff valve.
If propane vapor pressure is used, atmospheric
or room temperature below 8°F (-13,3°C) will
limit supply pressure to below 30 psig (2,1 bar).
To assure tight shutoff of the filler valve in this
event, refer to the table below.
In Case of Trouble
MINIMUM SUPPLY
PRESSURE, PSIG (bar) PUMP DISCHARGE, PSIG (bar)
MAXIMUM RECOMMENDED
1. If sticking of the main (upper) valve should occur, place a
few drops of oil below the disc holder, Key No.5 in Figure 3.
This can be done with an eye dropper or oil can through one
of the outlet ports. Refer to the disassembly instructions if this
does not correct the situation.
21 (1,4)
19 (1,3)
17 (1,2)
14 (0,97)
13 (0,90)
200 (13,8)
150 (10,3)
100 (6,9)
50 (3,4)
2. If the disc holder wears out quickly, check the outlet
pressure of regulator no. 2. Too high a regulator setting will
cause the disc to fail. Refer to step 4 under “Installation”.
25 (1,7)
5. Attach the propane filling hose to one of the filler valve
outlets. Plug the other outlet. The filling hose must be
complete with a shutoff valve and suitable cylinder valve
connection. The filling hose and shutoff valve can be
counterbalanced for easy handling if desired.
3. If the trip valve stem “B” should stick, remove the lower
trip valve body, and clean out all oil or grease. Polish the
seat in the trip valve body by rotating the eraser end of a
pencil against the seat 10 or 12 times.
Operation
Disassembly
1. Place cylinder on scale platform and connect filler hose.
2. Slide beam weight “H” to tare weight stamped on cylinder.
To check disc holder assembly, O-ring, and diaphragms
proceed as follows (numbers in parenthesis refer to Key Nos.
in Figure 3):
3. Balance scales to compensate for the weight added by
the filler hose and shutoff valve. On some scales this can be
done by means of a small weight near the beam pivot pin. On
others a suitable weight can be added to scale pan “F”.
1. Remove tubing connection from the angle adaptor in
Type 67/683 (key 30).
2. Mark the valve body (key 17), valve housing (key 2),
and valve head (key 1) so that they can be aligned easily
when reassembling.
4. Add a 100 pounds (45,4 kg) weight (or the net weight
desired) to scale pan “F”, and open the cylinder and hose
valve for trial automatic filling operation.
3. Remove cap screws (key 22).
5. Proceed with filling operation until scale beam rises and
contacts the trip valve stem. The filler valve will close and
the filling operation is complete. This is indicated by the red
button on top of the filler valve. Close the hose shutoff valve
and the cylinder valve.
4. Separate the valve head (key 1), valve housing (key 2), and
valve body (key 17). Examine the upper and lower diaphragms
(keys 10 and 32). Replace if necessary.
5. Remove orifice (key 3) and unscrew the disc holder
assembly (key 5). Examine and replace if necessary.
6. Check weight of full cylinder on another scale. Balance
weight or the weight in scale pan “F” may have to be
readjusted slightly until the correct cylinder weight is
obtained. Filling accuracy is largely dependent upon the
condition of the scale used with Type N201.
6. Remove bushing (key 8) and take out the O-ring (key 7).
Examine and replace if necessary. Put Dow Corning #3 grease
(or equivalent) on the O-ring.
7. Make sure all parts are clean before reassembling.
7. After the scales have been checked and adjusted, simply
position the empty cylinder on the scale, connect the filling
hose, slide beam weight “H” to the tare weight stamped on
the cylinder, open the hose shutoff valve and the cylinder
valve, and the N201 will fill the cylinder to the weight added
on the scale pan.
To reassemble
1. Replace orifice (key 3) in valve head (key 1).
2. Replace O-ring (key 7) and screw in bushing (key 8).
3. Replace disc holder assembly (key 5) and
spring (key 21). Screw the disc holder into the diaphragm
head (key 9).
Note
When operating with high pump pressure,
the filler valve may close off, then reopen
for a short spurt and close off again. This
is due to the force of the incoming liquid
stream. If the proper cylinder weight has
been obtained before the additional spurt,
4. Replace upper diaphragm (key 10) on the valve head
(key 1). Align the valve housing (key 2), spring (key 35),
lower diaphragm assembly (key 32), and valve body (key 17)
so that the cap screws (key 22) can be inserted.
5. Connect tubing (key 39) to angle adaptor in Type 67/683
(key 30).
3
Type N201
39 30 15
34 33 11 10 18 19
9
20 5
7
8
21 13 31 38 40
45
3
6
1
2
46
47
44 36 42
23 24
17 16 32
22 26 14 35
25 37
43
41
BUTTON AND BAR FOR
ATTACHMENT TO SCALE BEAM
Figure 3. Type N201
Parts List
Key
Description
Key
Description
24
25
26
30
31
32*
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
Trip Valve
Inner Valve
Screen Holder Assembly (2 required)
Type 67/683
Type 67/685
Diaphragm Assembly
Pipe Nipple (3 required)
Tee
1
2
3
5*
6
7*
8
9
10*
11
13
14
15*
16
17
18
19
20
21
22
23
Valve Head
Valve Housing
Orifice
Disc Holder Assembly
Control Valve Stem
O-Ring
Bushing
Diaphragm Head
Upper Diaphragm
Bushing
Pilot Valve
O-Ring Washer
O-Ring
Pilot Valve Stem
Valve Body
Indicator Rod
Sight Glass
Indicator Cap
Control Valve Spring
Cap Screw (6 required)
Trip Valve Stem
Spring
Inverted Flare Elbow (2 required)
Nut (2 required)
Hose Assembly
Tubing Assembly
Street Elbow
Beam Button
Beam Bar
Set Screw
Machine Screw
Vent Screen (2 required)
Trip Valve Spring
Spring Set
* Recommended spare parts for stock.
Fisher and Fisher Regulators are marks owned by Fisher Controls International, LLC. The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the
property of their respective owners.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, expressed
or implied, regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specifications of such products at any time
without notice.
Fisher does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of any Fisher product remains solely with
the purchaser.
Emerson Process Management
Fisher Controls International, LLC.
P.O. Box 8004
McKinney, Texas 75070, USA
Telephone: 1 (800) 588-5853
Telephone: 1 (469) 293-4201
©Fisher Controls International, LLC., 1980; All Rights Reserved
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