Refrigerating Specialties Division
3
20 m. Q 25 mm Q 32 mm Q 40 mm Q 50 mm Q 65 mm Q 75 mm Q 100mm Q
Item Description t t t ttttt
(3/4") y (1") y (1-1/4") y (1-5/8") y (2") y (2-1/2") y (3") y (4") y
1-6,8-17 Bonnet Assy. See Parts List #1
18,16, Pilot Seat Range A & D 20-0415-01K 1 20-0415-01K 1 20-0415-01 K 1 20-0415-01K 1 20-0415-01K 1 20-0415-02K 1 20-0415-02K 1 20-0415-02K 1
19 ➀➄ Range V (Vacuum Cartridge VC) 20-0415-00K 1 20-0415-00K 1 20-0415-00K 1 20-0415-00K 1 20-0415-00K 1 20-0415-00K 1 20-0415-00K 1 20-0415-00K 1
19 Gasket, Adapter 81-1000-19 1 81-1000-19 1 81-1000-19 1 81-1000-19 1 81-1000-19 1 81-1000-19 1 81-1000-19 1 81-1000-19 1
20 Fig. Ring-tube Asmbly. A4AOT 20-0419-06 1 20-0419-06 1 20-0419-07 1 20-0419-08 1 20-0419-08 1 20-0419-09 1 20-0419-10 1 20-0419-11 1
20, 45 “ “ “ “ A4AO, A4AL 20-0419-00K 1 20-0419-00K 1 20-0419-01K 1 20-0419-02K 1 20-0419-02K 1 20-0419-03K 1 20-0419-04K 1 20-0419-05K 1
21-27, 19 A4AO Pilot Assembly 20-0989-00K 1 20-0989-00K 1 20-0989-00K 1 20-0989-00K 1 20-0989-00K 1 20-0989-01K 1 20-0989-01K 1 20-0989-01K 1
21 Adapter, A4AO 20-4046-11 1 20-4046-11 1 20-4046-11 1 20-4046-11 1 20-4046-11 1 20-4046-11 1 20-4046-11 1 20-4046-11 1
22 Spring Nut 20-4088-00 1 20-4088-00 1 20-4088-00 1 20-4088-00 1 20-4088-00 1 20-4088-00 1 20-4088-00 1 20-4088-00 1
23 Spring, Pilot Plug 80-1001-28 1 80-1001-28 1 80-1001-28 1 80-1001-28 1 80-1001-28 1 80-1001-28 1 80-1001-28 1 80-1001-28 1
24-26 Valve Plug Repair Kit 21-0104-02K 1 21-0104-02K 1 21-0104-02K 1 21-0104-02K 1 21-0104-02K 1 21-0104-03K 1 21-0104-03K 1 21-0104-03K 1
24 Pilot Plug — — — — — — — —
25 “O” Ring, Seal 93-1001-15 1 93-1001-15 1 93-1001-15 1 93-1001-15 1 93-1001-15 1 93-1001-15 1 93-1001-15 1 93-1001-15 1
26 “O” Ring, Pilot Plug 93-1000-51 1 93-1000-51 1 93-1000-51 1 93-1000-51 1 93-1000-51 1 93-1000-51 1 93-1000-51 1 93-1000-51 1
27 Gauge Port Pipe Plug 92-1000-13 1 92-1000-13 1 92-1000-13 1 92-1000-13 1 92-1000-13 1 92-1000-13 1 92-1000-13 1 92-1000-13 1
28, 19, 29 Adapter, Body 20-1091-21K 1 20-1091-21K 1 20-1090-21K 1 20-1123-21K 1 20-1123-21K 1 20-1018-11K 1 20-1105-21K 1 20-1106-21K 1
29 Gasket, Adapter 81-1000-76 1 81-1000-76 1 81-1000-41 1 81-1000-22 1 81-1000-22 1 81-1001-02 1 81-1001-54 1 81-1000-34 1
Gasket, Adapter A4AE Only 81-1000-75 1 81-1000-75 1 81-1000-40 1 81-1000-21 1 81-1000-21 1 81-1001-01 1 81-1001-53 1 81-1000-33 1
30, 29 Piston-Stem 20-4040-00K 1 20-4040-00K 1 20-4056-00K 1 20-4011-01K 1 20-4011-01K 1 20-0411-02K 1 20-0411-03K 1 20-0102-15K 1
31 Screw, Adapter 90-1000-60 8 90-1000-60 8 90-1000-58 8 90-1000-58 8 90-1000-58 8 90-1000-58 8 90-1001-18 6 90-1001-18 6
Screw, Cover, A4AR 90-1000-60 8 90-1000-60 8 90-1000-58 8 90-1000-65 8 90-1000-65 8 90-1000-65 8 90-1001-17 6 90-1001-18 6
32, 45 Valve Body 20-4086-11K 1 20-4086-11K 1 20-1100-14K 1 20-1149-01K 1 20-1149-01K 1 20-1015-11K 1 20-1023-11K 1 20-1041-12K 1
33-33B Throttling Plug Ass’y. 20-0410-00K 1 20-4010-01K 1 02-0410-02K 1 20-0410-03K 1 20-0410-04K 1 20-0410-05K 1 20-0410-06K 1 20-0410-13K 1
A4AK 20-0412-00K 1 20-0412-01K 1 20-0412-02K 1 20-0410-03K 1 20-0410-04K 1 20-0410-05K 1 20-0410-06K 1 20-0410-13K 1
33 Throttling Plug — — — — — — — —
33A Manual Opening Stem — — — — — — — —
33B Stem Nut — — — — — — — —
34 Spring, Closing 80-1001-32➂ 1 80-1001-32➂ 1 80-1001-33➃ 1 80-1001-35 1 80-1001-35 1 80-1001-36 1 80-1001-37 1 80-1000-35 1
35 Dirt Wiper Retainer 20-4067-00 1 20-4067-00 1 20-4067-00 1 20-4080-00 1 20-4080-00 1 20-4080-00 1 20-4085-00 1 20-4109-00 1
36 Dirt Wiper 20-4042-00 1 20-4042-00 1 20-4042-00 1 20-4042-00 1 20-4042-00 1 20-4042-00 1 20-4084-00 1 20-4084-00 1
37 Seal, Bottom Cap 93-1000-79 1 93-1000-79 1 93-1000-79 1 81-1000-15 1 81-1000-15 1 81-1000-15 1 81-1000-08 1 81-1000-17 1
38, 37 Bottom Cap 20-4043-00K 1 20-4043-00K 1 20-4050-11K 1 20-4050-11K 1 20-4050-11K 1 20-4050-11K 1 20-4048-11K 1 20-1113-00K 1
39 Screw, Bottom Cap — — — 90-1000-81 6 90-1000-81 6 90-1000-81 6 90-1001-17 6 90-1001-17 6
40 Packing Washer 20-1084-00 1 20-1084-00 1 20-1084-00 1 20-1084-00 1 20-1084-00 1 20-1084-00 1 20-1114-00 1 20-1114-00 1
41 Packing Ring 20-1077-00 1 20-1077-00 1 20-1077-00 1 20-1077-00 1 20-1077-00 1 20-1077-00 1 20-1116-00 1 20-1116-00 1
42 Stuffing Box Nut 20-1080-00 1 20-1080-00 1 20-1080-00 1 20-1080-00 1 20-1080-00 1 20-1080-00 1 20-1129-00 1 20-1129-00 1
43 Gasket, Seal Cap 81-1000-12 1 81-1000-12 1 81-1000-12 1 81-1000-12 1 81-1000-12 1 81-1000-12 1 81-1000-20 1 81-1000-20 1
44 Seal Cap 20-4005-00 1 20-4005-00 1 20-4005-00 1 20-4005-00 1 20-4005-00 1 20-4005-00 1 20-1130-00 1 20-1130-00 1
45 Gasket, Flange➁ 81-1000-03 2 81-1000-03 2 81-1000-04 2 81-1000-05 2 81-1000-05 2 81-1000-05 2 81-1000-07 2 81-1000-09 2
46 Bolt, Flange 90-1001-14 4 90-1001-14 4 90-1001-11 8 90-1001-20 8 90-1001-20 8 90-1001-35 8 90-1001-35 8 90-1001-32 8
Bolt, Flange (inlet)
A4AO, A4AL, A4AOT Only 90-1001-14 2 90-1001-14 90-1001-11 4 90-1001-20 4 90-1001-20 4 90-1001-35 4 90-1001-35 4 90-1001-32 4
Bolt, Flange (outlet)
A4AO, A4AL, A4AOT Only 90-1001-20 2 90-1001-20 2 90-1001-14 4 90-1001-20 4 90-1001-20 4 90-1001-35 4 90-1001-35 4 90-1001-32 4
47 Nut, Flange 90-1000-02 4 90-1000-02 4 90-1000-02 8 90-1000-02 8 90-1000-02 8 90-1000-05 8 90-1000-05 8 90-1000-060 8
112, 29 Cover, A4AR 20-1010-12K 1 20-1010-12K 1 20-1001-01K 1 20-1003-01K 1 20-1003-01K 1 20-1019-12K 1 20-1005-13K 1 20-1006-12K 1
Item Description Part No. Qty.
1 Seal Cap 20-4005-00 1
Seal Cap A4AK only 20-4005-01 1
1A Wire & Seal A4AK only 93-1001-21 1
2 Gasket, Seal Cap 81-1000-12 1
3 Nut, Stuffing Box 20-1080-00 1
4 Packing Ring 20-1077-00 1
5 Packing Washer 20-1084-00 1
6 Adjusting Stem 20-4007-00 1
7 Fitting, Bonnet A4AL only 20-4110-00 1
7A A4AOEonly 30-1017-00 1
Item Description Part No. Qty.
8, 16 Bonnet 20-4044-11K 1
Bonnet A4AP, A4AL,
A4A3P 20-4044-12K 1
9 Nameplate 20-4100-01 1
Nameplate for field
conversion 20-4100-00 1
10 Screw, Name Plate 90-1000-23 2
11 Screw Bonnet 90-1000-57 8
Screw, Bonnet A4AK 90-1000-57 7
Screw, Bonnet A4AK 20-4101-00 1
Item Description Part No. Qty.
11 Screw Bonnet A4AO,
A4A3P 90-1000-61 8
12 Spring Rest,
Upper Range A&V 40-1025-00 1
Range D 20-4018-00 1
13 Spring, Range A & V 80-1001-15 1
Spring, Range D 80-1001-16 1
14 Spring Rest,
LowerRange A & V 40-1026-00 1
Range D 20-4017-00 1
Item Description Part No. Qty.
15 Diaphragm Follower 20-1092-00 1
16 Bonnet Gasket 81-1001-35 1
Bonnet Gasket A4AP &
A4AL 81-1001-47 1
17 Diaphragm, Range
A & V 20-1087-04 1
Diaphragm, Range D 20-1087-04 2
16, Diaphragm Kit
17, Range A & V 21-0103-00K 1
19 Range D 21-0103-01K 1
PARTS LIST #1 – COMMON PARTS – (Figure 1)
PARTS LIST #2-BASIC REGULATORS-(Figure 1)
DISASSEMBLY& ASSEMBLY (cont.)
to the diaphragm and pilot seat may occur. Place Gasket 19 in the slot
in the adapter and align Gasket 16 and Diaphragm 17 to the center of
bonnet. The raised center of the diaphragm must be towards the bonnet.
For range “D” use two diaphragms. Tighten Cap Screws 11 evenly. The
ideal tightening torque is 1.5 kg-m (11 ft.-lbs.). Valve is now ready to be
adjusted for normal operation.
If close-coupled strainer is used, it may be cleaned before putting the
valve back in operation. The regulator must be tested for leaks with
refrigerant gas or other appropriate gas before the system is put into
operation.
A4A
After the General Procedure for disassembly, inspect the Pilot Seat 18
top seating surface for dirt, wear or damage. Remove seat from valve
body and clean, lap on a flat plate or replace as necessary. Examine
the diaphragm region which contacts the seat surface, look for dirt,
heavy scratches or corrosion. If the diaphragm cannot be easily wiped
clean, it should be replaced. Reassemble the regulator following the
General Procedure.
A4AP, A4A3P and A4AL
Remove the sensing tube connection which is part of the Flange Ring
tube Assembly 20 attached to the bonnet (A4AL) or the external
pneumatic connection to the bonnet (A4AP or A4A3P). Disassemble
following the General Procedure. Check the seat and diaphragm as for
A4A. Check the parts inside the bonnet for dirt, moisture or corrosion,
especially on the outside diameter of the diaphragm follower. If the
source of dirt, moisture or corrosion cannot be eliminated, it may be
advisable to install and maintain a filter-drier in the sensing line to the
bonnet. Reassemble the regulator as described in the General
Procedure and connect the sensing tube.
A4AK
For disassembly and assembly follow the General Procedure and the
procedure for A4A. This regulator has a sealed wire connection to keep
the seal cap from being removed. This wire must be removed before
the regulator can be disassembled. Please Note: Removal of the seal
voids any Refrigerating Specialties Division factory responsibility
for the regulator pressure set-point.
For flanges available, see Flange Table on page 12. Part numbers with “-K” suffix are Kits which include item numbers shown.
➀ Chrome plated Pilot Seat standard ➁ A4AO, A4AL, A4AOT only. Quantity is 3. ➂ A4AK is 80-1001-48 ➃ A4AK is 80-1001-49. ➄ Not used with any A4AO or variations.
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