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Section 3
Rev. 06/15
Safety, Installation, Operations & Service Manual
DOPSM2080X012
Care must be used to not damage valve surfaces.
3.5.5 Reassembly
The regulator is reassembled in the reverse order of disassembly, observing the following
precautions. Please reference the Bill of Material and Assembly Drawing for the correct
location of replacement parts and correct torque specifications.
1. Inspect all parts and replace those worn or damaged with TESCOM replacement parts.
2. All parts should be cleaned to the cleanliness level required for safe operation with
the media and system they will be used in. All parts in the flow stream must be free of
particles which could prevent proper seating of the main valve.
3. Apply a thin uniform coating of fluorocarbon grease to any or all of the following parts:
Indentation of spring button, threaded portion of adjusting screw, entire threaded area
of the bonnet, all O-rings, all threaded parts internal to regulator.
NOTE: Do NOT apply any type of grease to the inlet or outlet connections.
4. Valve seats must be installed with the chamfered side towards the main valve.
5. Standard regulator with control knobs - The body and bonnet are best joined by
holding the bonnet assembly open end up and lowering all required items into place
one at a time. The last item to be placed in the body of the majority of TESCOM
regulators, is the piston sensor. Place all O-rings and back-up rings that are external
to the piston sensor in the body before placing the sensor in place. O-rings should
always be installed before back-up rings. The bonnet and body may now be attached.
This is best done by holding the body in one hand and the bonnet in the other. Tilt the
body at a 45° angle and then attach the bonnet by screwing it into the body firmly,
hand tight. Regulator should then be placed in vise and bonnet re-torqued to correct
specifications. See Assembly Drawing.
6. Dome/Spring combination and Dome Loaded regulators are more easily reassembled
by holding regulator firmly in vise and reinstalling dome.
7. Reinstalling wire mesh inlet filter - Insert filter into primary inlet port. It must then be
expanded to fit correctly. This can be accomplished by inserting a metal tool the same
size as the port and then lightly tapping it with a hammer.
After regulator has been reassembled, it must be connected to a pressure source
with media compatible with the use of the regulator and pressurized to check for
internal and external leakage and operating characteristics.
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