W3012-1
W2772-1
!
Figure 3.
Easy Trim Maintenance
REPLACING ENTIRE TRIM PACKAGE
REPLACING TRIM PARTS ON SITE
USING BODY AS HOLDING FIXTURE
1.
Handle or similar tool may be inserted into the orifice
slots (Figure 3) and a strap wrench may be wrapped
around the cage or a soft bar may be inserted
through the 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 screw-driver into the pre-cut fold over area of
the piston ring and unfold the piston ring.
2. Replace parts such as the gasket (key 4) and
cage O-ring (key 17) if worn or damaged, making
sure that if the port seal (key 12) and upper seal
(key 15) were removed they are installed in their
retaining slots with the grooved sides facing out.
Lightly lubricate seating surfaces and parts as
necessary for ease of installation. For proper
operation, a Type 63EG valve plug must have pipe
plugs (key 31) installed in all four balancing ports.
3. Install the plug O-ring (key 20) and piston ring
(key 14) onto the valve plug (key 16). Insert the
valve plug into the body flange (key 2), install the
cage (key 11) plus upper seal (key 15) and cage
O-ring (key 17) into the body flange and then install
the seat ring (key 13) plus port seal (key 12) into
the cage. Use the valve body as a holding fixture
during this step as shown in Figure 3 and insert a
wrench handle or similar tool into the orifice slots for
leverage when tightening the orifice and cage.
Note
When installing the trim package, align the
body flange and valve body side tappings.
4.
Remove the upside-down body flange (key 2) if
it was anchored on the body. Lightly lubricate the
cage seating surfaces of the valve body web and
the body flange. Install the body flange on the
body (key 1) and secure it evenly with the cap
WARNING
1. Screws or stud bolts (key 3). Install the pilot and its
pipe nipple and connect the pilot tubing.
2.
Install the spring (key 9) and place the flange O-ring
(key 21) on the flange plug (key 27). Install the flange
plug; if necessary, compress the spring enough to
ensure secure engagement of plug and body flange
threads before final tightening of the plug.
Type MR98H Pilot
To avoid personal injury, property
damage or equipment damage caused
by sudden release of pressure or
uncontrolled process fluid, do not
attempt any maintenance or disassembly
without first isolating the regulator
from system pressure and relieving all
internal pressure from the regulator.
Relief valves or regulators that have been
disassembled for repair must be tested
for proper operation before being returned
to service. Only parts manufactured by
Emerson should be used for repairing
Fisher™ relief valves and regulators.
Due to normal wear and damage that may occur from
external sources, relief valve parts such as the O-rings,
gaskets, diaphragm, orifice and valve plug should be
inspected periodically and replaced as necessary. The
frequency of inspection and replacement depends upon
the severity of service conditions or the requirements of
state and federal laws.
The following instructions explain the disassembly of
the Type MR98H relief or backpressure pilot. Lightly
apply a good quality lubricant when reassembling. Key
numbers are referenced in Figure 7.
6
Type 63EG-98HM
