3
Installation and Maintenance Instructions
Model 441-S Regulator
Servicing and Adjustment
General Notes
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
38
from the sides of the body.
They also provide greatly improved access to the valve
when servicing or adjusting.
3
The valve and body parts are interchangeable with other
441 Regulators (441-57S, 441-X57, 441-VPC,
441-2100, etc.).
4
Use lubricants sparingly and with care to avoid exposing
tacky surfaces to the gas stream. Such surfaces could
cause accumulation of dirt on close clearance parts.
Use moly or silicone-type lubricants. Avoid the use of
petroleum base types
.
Lubricate stem
24
, guide
50h
, and stem O-ring
23
with dry
silicone lubricant to help assure free movement and a tight
seal.
An application of lubricant to the other O-rings and the
tetraseals in the regulator will help assure their tightness.
To Remove Valves
1
Remove seal cap
1
, back off adjusting screw
10
, remove
housing cover
5
, and spring
14
.
2
Remove bottom plate
33
, and side plates
38
.
3
Insert an Allen wrench through side inspection opening and
loosen Allen screw
50h
.
4
Unscrew lower valve assembly and remove through bottom
opening (
50h
unscrews from
24
).
5
Unscrew upper valve assembly and remove through side
opening (
50e
or
50j
unscrews from
24
).
Note:
a.
If upper valve assembly is too large to remove through side
opening, then remove it through bottom opening by also
removing outlet orifice
29
, (remove cap screws
26
to
remove orifice, and, if tight, jack out using cap screws
in jacking holes).
b.
Entire valve assembly may be removed intact through
bottom opening by also removing orifice
29
. This method
leaves the lock-up adjustment undisturbed.
c.
Use care with orifice gasket
27
.
6
To disassemble upper and/or lower valve assembly, remove
nuts
50a
.
To Replace and Adjust Valves
1
Assemble upper valve assembly (parts
50a
,
50b
,
50c
,
50d
,
50e
,
50f
,
50g
,
50j
), and lower valve assembly (parts
50a
,
50b
,
50c
,
50d
,
50h
). Firmly tighten nuts
50a
. (Also,
50i
should be firmly tightened against
50a
).
2
Insert upper valve assembly and screw into place by a few
turns (
50e
or
50i
screws into
24 but should be loose by
1/2 to 1 turn
).
3
If orifice
29
was removed, reinstall it.
4
Inset lower valve assembly and screw into place by a few
turns (
50h
screws into
50e
).
5
Turn upper valve assembly so Allen screw
50g
is accessible
through side inspection opening.
6
Make the valve lock-up adjustment as follows:
a.
Hold upper valve against its seat. This can be done by
hand, reaching through side inspection opening.
b.
While holding the upper valve against its seat, screw
lower valve assembly upwards until the lower valve also
touches its seat. When both upper and lower valves are
touching their seats they are correctly adjusted for tight
lock-up.
c.
Firmly tighten Allen screw
50g
. This locks the adjustment
by evenly and tightly locking
50h
and
50e
together.
Note:
If the entire valve assembly was removed intact and
Allen screw
50g
has not been loosened, the assembly may
be reinstalled without making the lock-up adjustment.
7
Screw entire valve assembly up (
50e
or
50i
screws into
24)
until it bottoms. Then
back off 1/2 to 1 full turn - this is
important
.
8
Replace side plates
38
.
9
Replace bottom plate
33
. Match bottom end of
50h
into
31
and/or
32
and then turn bottom plate either way
to first matching bolt hole position.
To Remove Orifices
1
Remove outlet orifice
29
per applicable steps 1 through 5
under section “To Remove Valves”.
2
Remove inlet orifice
28
as follows:
a.
Remove seal cap
1
, back off adjusting screw
10
, remove
housing cover
5
and spring
14
.
b.
Remove bottom plate
33
and then unscrew valve assembly
by grasping
50h
and turning (
50e
or
50i
unscrews from
24
).
c.
Remove diaphragm case assembly by first opening union
60
and removing cap screws
34
.
d.
Remove cap screws
26
and remove inlet orifice
28
.
If orifice is tight, jack out cap screws in jacking holes.
Use care with gasket
27
.
e.
When replacing diaphragm assembly, the threaded
connection between
24
and
50e
or
50i
should be
screwed together until it bottoms and
then
backed off 1/2 to 1 turn - this is important
CAUTION
Regulators are pressure control devices with numerous moving
parts subject to wear that is dependent upon particular
operating conditions. To assure continuous satisfactory
operation, a periodic inspection schedule must be adhered to
with the frequency of inspection determined by the severity of
service and applicable laws and regulations.
