2" and 3" Models
Illustration Part
Number Description Number
32
Guide Bushing with Pin, brass 090-16-385-01
Guide Bushing with Pin,
090-16-385-03
stainless steel
34
Hex Cap Screw, 1/2" –
910106
13 x 1-1/4"
35
Tetraseal (or O-Ring),
904085
4-3/8" x 4-5/8"
36
Tetraseal (or O-Ring),
904084
3" x 3-1/4"
37 Centerpiece Stem Bushing 090-16-373-00
37a Aluminum Seal Ring 090-26-178-00
39
Tetraseal (or O-Ring),
904078
3-1/4" x 3-1/2"
8
Model 441-57S Condensed Parts List
2", 3", 4", and 6" Models
Illustration Part
Number Description Number
1a Tetraseal (or O-Ring), 1-3/4" x 2" 904092
4
Hex Cap Screw, 5/16" – 18 x 1",
910030
120,000 tensile, 8 used
6 Housing Cover Gasket 091-00-066-30
7 Vent Cap, 1/4 NPT 137-02-505-02
10 Spring Adjustment Screw 090-16-007-02
11 Hex Steel Jam Nut, 5/8" – 11 921407
13
Thrust Bearing, 3/8" dia.
930510
stainless steel ball
Spring, Yellow 3 to 6 psi 091-00-021-05
Spring, Gray 5 to 9 psi 091-00-021-04
Spring, Blue 7-1/2 to 15 psi 091-00-021-03
Spring, Red 12-1/2 to 30 psi 091-00-021-02
14 Spring, Brown 25 to 55 psi 091-00-021-01
Spring, Black 50 to 75 psi 091-00-021-00
Spring, Brown plus White
70 to 100 psi
Brown outer spring 091-00-021-01
White inner spring 091-00-021-08
16 Hex Steel Nut 5/8" 905993
17 Split Lockwasher 5/8" 932531
19 Diaphragm Plate, upper 091-00-010-00
20 Diaphragm, 5" Roll-Out 091-00-350-00
41
Hex Steel Nut, 3/8" –
920853
16, 8 used
42
Hex Steel Bolt, 3/8" –
910058
16 x 1-3/4" Lg., 8 used
Travel Indicator Assembly
5/8" scale
45 (1-1/2", 1-3/4", 2-1/8" valves) 091-00-365-75
1" scale (3" valves) 091-00-365-77
1-1/4" scale (4-1/4" valves) 091-00-365-79
60
1/2" NPT Nipple, Orifice Plug
090-16-361-01
and Steel Union Assembly
90 Nameplate 090-00-086-05
91 Nameplate, round 090-16-086-00
92
Rd. Hd. Type U Drive Screw,
903004
#4 x 3/16" Lg.
93
Rd. Hd. Machine Screw,
914402
6-32 x 1/4" Lg.
2" and 3" Models
Illustration Part
Number Description Number
22 Lower Diaphragm Plate 091-00-022-00
22a O-Ring, 5/8" x 3/4" 902922
23 O-Ring, 11/16" x 7/8" 934013
24
Diaphragm Connecting Screw,
090-16-058-00
stainless steel
2" Models
Illustration Part
Number Description Number
26
Hex Cap Screw, 1/4" –
910001
20 x 1/2" Lg., 120,00 tensile
27 O-Ring for Orifices 904832
1-3/4" Inlet Orifice, plated steel 090-16-028-00
28
1-3/4" Inlet Orifice, stainless steel 090-16-028-50
1-1/2 Inlet Orifice, plated steel 090-16-028-01
1-1/2" Inlet Orifice, stainless steel 090-16-028-51
1-3/4" Outlet Orifice, plated steel 090-16-029-00
26
1-3/4" Outlet Orifice, stainless steel 090-16-029-50
1-3/4" Outlet Orifice, plated steel 090-16-029-01
1-3/4" Outlet Orifice, stainless steel 090-16-029-51
3" Models
Illustration Part
Number Description Number
26 Hex Cap Screw, 1/4" –
910001
20 x 1/2" Lg., 120,00 tensile
27 O-Ring for Orifices 950818
2-1/8" Inlet Orifice, plated steel 090-20-028-00
2-1/8" Inlet Orifice, stainless steel 090-20-028-50
28
1-3/4" Inlet Orifice, plated steel 090-20-028-02
1-3/4" Inlet Orifice, stainless steel 090-20-028-52
1-1/2" Inlet Orifice, plated steel 090-20-028-03
1-1/2" Inlet Orifice, stainless steel 090-20-028-53
2-1/8" Outlet Orifice, plated steel 090-20-029-00
2-1/8" Outlet Orifice, stainless steel 090-20-029-50
29
1-3/4" Outlet Orifice, plated steel 090-20-029-02
1-3/4" Outlet Orifice, stainless steel 090-20-029-52
1-1/2" Outlet Orifice, plated steel 090-20-029-03
1-1/2" Outlet Orifice, stainless steel 090-20-029-53
Installation and Maintenance Instructions
Model 441-57S Regulator
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