Types 63EG and 1098-63EGR
9
A3790
4. Coat the cage seating surfaces of the valve body
web and the body flange seating surfaces of the
valve body neck with a good grade of general-
purpose grease. Install the trim package and
secure it evenly with the cap screws or hex nuts.
With a Type 63EG main valve, install the pilot and
its pipe nipple and connect the pilot supply tubing.
Replacing Trim Parts
Perform this procedure if inspecting, cleaning or
replacing individual parts in a trim package. Key
numbers for the Type 63EG main valve are referenced
in Figure 10. Key numbers for the Type 63EGR
main valve are referenced in Figure 11. Both types
are available with travel indicator, even though
travel indicator key numbers are referenced only
in Figure 11.
Note
Access to the spring (key 9), flange
O-ring (key 21) or travel indicator
parts, in step 1 can be gained without
removing the body flange (key 2).
1. Remove the flange plug and spring (keys 27
and 9) or the travel indicator assembly by
removing lower indicator fitting (key 5) from
the body flange (key 2). Proceed to step 5 if
maintenance on only the travel indicator parts
is needed and then proceed to step 11 for
reassembly instructions.
2. Remove the cap screws (key 3) on a cast iron or
steel body or remove the stud bolt nuts (key 29,
not shown) on a Stainless steel body and
(after removing the pilot and pipe nipple from a
Type 63EG main valve) pry the body flange loose
from the valve body (key 1).
3. Use the valve body as a holding fixture if desired.
Flip the body flange over and anchor it on the
valve body as shown in Figure 9, removing the
pipe plug (key 31) first if necessary.
4. To gain access to the port seal (key 12), upper
seal (key 15) or valve plug parts, unscrew the seat
ring (key 13) from the cage (key 11) and the cage
from the body flange. For leverage, a wrench
handle or similar tool may be inserted into the
orifice slots (Figure 9) and a strap wrench may be
wrapped around a standard or a Whisper Trim™
cage or a soft bar may be inserted through the
PORT A (EXHAUST) — THE MAIN VALVE LOADING PRESSURE IS
DISCHARGED TO THE MAIN VALVE OUTLET OR TO
ATMOSPHERE PRESSURE.
PORT C (LOADING) — A LOADING PRESSURE SIGNAL IS SENT FROM THIS
PORT TO THE MAIN VALVE DIAPHRAGM CASING.
PORT D (CONTROL)— THE MAIN VALVE INLET PRESSURE IS SENSED AT
THIS PORT.
Figure 7.
Pilot Port Functions
windows of a standard cage. To remove the piston
ring (key 14) and/or plug O-ring (key 20), remove
the valve plug (key 16) from the body flange, insert
a screwdriver into the precut fold over area of the
piston ring and unfold the piston ring. Proceed to
step 6 if no further maintenance is necessary.
5. To gain access to a part in the travel indicator
assembly, remove the indicator protector (key 19)
and indicator scale (key 18). Since some
compression is left in the spring, carefully remove
the flanged nut (key 22) and hex nut (key 8). A
screwdriver may be inserted through the press-fit
O-ring retainer (key 6) to remove the stem O-ring
without removing the O-ring retainer. If necessary,
unclip the E-ring from the indicator stem.
6. Thoroughly clean and inspect all parts before
reassembling. For proper operation, a Type 63EG
valve plug must have pipe plugs (key 32,
Figure 12) installed in all four balancing ports,
but a Type 63EGR valve plug must have these
balancing ports left open.
7. Apply a minimal amount (2 to 3 drops) of silicon oil
to the port seal (key 12) and install it flat side down
in the gland in the seat ring (key 13). Run a finger
around the port seal (key 12) until it is completely
PORT C
(LOADING)
PORT A
(EXHAUST)
PORT D
(CONTROL)
