5"
(Minumum Service Space)
Self Adjustment
Screw for Desired
Outlet Pressure
2
3
1
Vent
Remove Vent
(If Required)
461-57S
20.5"
20
A
Downstream
Control Line
Control Line
Connection
B
Outlet
8"
4"
F
Minumum
Service Space
(Bypass (If Required)
Inlet
C
3
Installation and Maintenance Instructions
Model 461-57S Regulator
Servicing and Adjustment
General Notes (see Illustration on page7)
1
Make sure the regulator is entirely depressured before servicing.
2
A quick visual inspection of the valve can be made by
removing inspection plates
33
from the sides of the body.
These also provide greatly improved access to the valve when
servicing or adjusting.
3
The diaphragm
11d
, the springs
9
, and all other parts from
the diaphragm up (except the
11h
stud) are interchangeable
with the Model 441-57S Regulator. Valve and body parts are
interchangeable with other 461 Regulators
(461-S, 461-X57, 1100, 1200, 461-2100).
4
Use lubricants sparingly and with care to avoid exposing tacky
surfaces to the gas stream. Such surfaces could cause dirt
accumulation on close clearance parts.
Use moly or silicone type lubricants. Avoid the use of
petroleum base types.
Lubricate the stem
12b,
guide
12j
and stem O-rings
12a
&
12n
with dry silicon lubricant to help assure free
movement and a tight seal.
An application of lubricant to other O-rings and the tetraseals
in the regulator will also help assure their tightness.
5
When using double seat balanced valve assembly, bushing
13
must be screwed firmly into place. When using single seat
balanced valve assembly, bushing
13
must be removed.
To Service Double Seat Balanced Valve Assembly
1
Remove seal cap
1
, back off adjusting screw
2
, remove
housing cover
6
, and remove spring
9
.
2
Remove bottom inspection plate
14
, and unscrew valve
assembly intact from diaphragm assembly (
12b
unscrews
from
11h
).
3
Unscrew orifice
18
with socket wrench (1-1/2" hex, deep
socket). Remove orifice
18
and valve assembly intact
through bottom opening.
4
If valve assembly and orifice are alright, screw orifice
18
firmly into place. Replace without disturbing set screw
12g
.
Top end of
12b
screws into
11h
until it bottoms and should
then be
backed off 1/2 to 1 full turn
.
5
If new parts are needed, disassemble valve assembly by
loosening set screw
12g
and unscrewing
12h
from
12b
, and
then unscrewing nut
12e
and part
12j
.
6
Replace parts as required, then reassemble upper half valve
assembly (parts
12a
,
12b
,
12c
,
12d
,
12e
) and lower half
(parts
12f
,
12g
,
12h
,
12c
,
12d
,
12j
).
7
Insert through bottom opening:
a. upper half valve assembly - screw
12b
onto
11h
until
it bottoms then
back off 1/2 to 1 full turn
.
b. orifice
18
- screw firmly into place.
c. lower half valve assembly - screw onto upper half
by 3 or 4 turns (
12h
screws onto
12b
).
8
Make the valve lock-up adjustment. Seat the upper valve
against orifice
19
while screwing up the lower half valve
assembly (
12h
screws onto
12b
until the lower valve is
seated against
18
). Then, firmly tighten set screw
12g
.
a. To seat the upper valve against orifice
19
, either reach
it through the body side opening or remove diaphragm
assembly and pull top end of stem
12b
upwards.
b. Tighten
12g
with screwdriver through body side
opening. If necessary, turn the entire valve assembly
(carefully – do not disturb adjustment to face
12g
toward side opening).
c.
12g
must tighten against flat area at top of
12h
to
correctly lock the adjustment.
9
Screw entire valve assembly up (top of
12b
screws onto
lower end of
11h
until it bottoms), then
back off 1/2 to 1
full turn - this is important
.
10
Complete assembly as per steps 6 thru 10 under
“To Assemble 461-57S”.
Figure 1. Typical Arrangement and Dimensions (indoor and outdoor installation)
Regulator Body Type
(Face to Face, in.)
Screwed6-1/2
Flanged ANSI 125
10
Flanged ANSI 250
10-1/2
Flanged ANSI 300
10-1/2
Flanged ANSI 600
11-1/4
