Instruction Manual

299H Series
11
KEY 72 - OPTIONAL P590 SERIES FILTER
Figure 3. Optional P590 Series Filter
A7008
Main Body Valve Disk and Orice
Follow this procedure to inspect, clean or replace
the main body valve disk or to inspect or replace the
orice. Part key numbers are referenced in Figures 5
and 6.
Note
The regulator body may remain in the
pipeline during maintenance procedures.
1. Disconnect the pilot supply tubing (key 21) from
the main body (key 17).
2. Remove the two hex head cap screws (key 18)
which hold the lower casing (key 1) to the body.
Separate the lower casing from the body. Inspect
the body O-ring (key 15) and replace if worn
or damaged.
3. Examine the valve disk (key 13) and orice (key 12)
for nicks, cuts and other damage. Unscrew the disk
holder assembly from the valve stem assembly
(key 16) and replace it with a new part if necessary.
For the Type 299HS, also examine the insert and
O-ring (keys 82 and 83, Figure 7) for any damage.
Replace if needed.
If the orice is being replaced with a new or
differently sized orice, change the nameplate
(key 63) to state the new size and maximum
inlet pressure. Lubricate the threads and at
face of the orice with a good grade of anti-seize
lubricant. Install the orice using 100 to
120 foot-pounds / 136 to 163 N•m of torque.
4. After replacing all damaged parts, slide the entire
assembly into the valve body (key 17) and secure
with the two hex head cap screws (key 18).
5. Connect the pilot supply tubing (key 21), then refer
to the Startup section for putting the regulator
into operation.
Integral Pilot Valve Disk and Orice
Follow this procedure to inspect, clean or replace the
integral pilot valve disk or orice. Part key numbers are
referenced in Figures 5 and 6.
1. Remove or loosen the pilot supply tubing (key 21).
2. Remove the inlet tting (key 47) and the four
machine screws (key 46).
3. Examine the valve disk (key 52) for nicks, cuts and
other damage. Unscrew the disk holder assembly
from the valve stem (key 48) and replace
if necessary.
4. If the seating edge of the orice (key 50) is nicked
or rough, use a thin-walled socket to remove the
orice from the inlet tting (key 47). Install a new
orice and a lightly lubricated O-ring (key 49) when
reassembling the regulator.
5. Inspect the check valve assembly (key 45) and
the bleed restriction (key 70) for damage and
replace if necessary.
6. The Type 299H has a wire inlet screen (key 51)
in the pilot supply inlet tting (key 47). If clogging
is suspected in the pilot supply, remove the elbow
tting (key 19) and clean the wire screen.
7. Lightly lubricate the O-ring (key 54) on the inlet
tting (key 47) and reinstall using the four machine
screws (key 46). Torque the machine screws to
30 to 40 inch-pounds / 3.4 to 4.5 N•m. Then install
and tighten the pilot supply tubing.
Integral Pilot Control Spring and Diaphragm
Follow this procedure to change the pilot control spring
or to inspect, clean or replace the diaphragm. Part key
numbers are referenced in Figures 4, 5 and 6.
1. Remove the pilot closing cap (key 29) and
loosen the hex lock nut (key 35). Turn the
adjusting screw (key 36) counterclockwise to
ease spring compression.
2. Unscrew the bonnet (key 34).
7
6
5 2 5
1 4 3