Parts
16 309474U
Mechanical Back Pressure Regulators
Part Numbers 233758, 233811, 233950, 234255, 234261, and 234262
3
4
28
25
24
22
21
19
10
12
13
11
17
15
14
2
3
4
1
10
4
8
9
23
16
2
1
5
5
Torque to 4-5 N•m (35-44 in-lb).
Torque to 2 N•m (18 in-lb).
Torque to 5 N•m (44 in-lb).
Grease OD.
Used only on non-npt models
233758, 233950, and 233811.
Not used on models 233811 and
234255.
Models 233811 and 234255 use a
plug and retaining ring (not shown).
Apply medium-strength (blue)
thread locker to the threads.
1
2
3
4
5
6
7
6
7
6
6
TI11249a
8
8
Ref. Part Description Qty.
1
----
HOUSING, lower, for 233758
and 233950
1
----
HOUSING, lower for 234262
and 234261
1
15A198 HOUSING, lower, for 233811 1
15C303 HOUSING, lower, for 234255 1
2 245369 SEAT, valve, for 233758,
233950, 234261, and 234262
1
15A228 SEAT, valve, for 233811 and
234255
1
3 15Y036 O-RING, not used on models
233811 and 234255
1
4 15Y035 O-RING, for 233758, 233950,
234261, and 234262
2
15Y031 O-RING, for 233811 and
234255
2
8 15A143 COVER, for 233758, 233950,
234261, and 234262
1
15A222 PLUG, for 233811 and 234255 1
9 117123 SCREW, fhms, M4x10, not used
on models 233811 and 234255
2
10 15A219 RING, for non-npt models
233758, and 233950
2
15A221 RING, for non-npt model
233811
2
11 117101 PLUG, threaded, not used on
models 233811 and 234255
2
12 117085 SEAL, ring 1
13 117099 PLUG, threaded 1
14 245373 PLUNGER, valve, for 233758,
233950, 234261, and 234262
1
245378 PLUNGER, valve, for 233811
and 234255
1
15 15A179 DIAPHRAGM 1
16 15A172 CAP, spring 1
17 117122 NUT, seal-lock 1
19 117087 SPRING, compression, for
233758 and 234262
1
117095 SPRING, compression, for
233811, 233950, 234261, and
234255
1
21 15A177 PLATE, spring, top 1
22 117105 BALL, 6 mm 1
23 15A185 PACKING, PTFE with carbon 1
24 245365 HOUSING, upper 1
25 117126 SCREW, shcs, M5x16 8
28 15A241 SCREW, custom 1
29 117124 RING, retaining, 233811 and
234255 only
1
Ref. Part Description Qty.
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