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Section 3
Rev. 06/15
Safety, Installation, Operations & Service Manual
DOPSM2080X012
Care must be used to not damage valve. A Special service tool (Part number 6557-3)
may be ordered from the factory to aid in the disassembly of the main valve assembly
found in TESCOM Regulator Models 26-1000, 26-2000, 44-1100, 50-2000 and 54-2000.
NOTE: Several TESCOM regulators are supplied with internal filters. They will be located
either in the inlet port or in the main valve area of the regulator. In each case, they should
be removed and replaced before reassembly.
3.3.5 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 dropping all required items into
place one at a time. The last item to be placed in the body of most all 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. Self-Venting Regulator - If your regulator has an adjustable vent valve mechanism, it is
set on final assembly at the factory and usually will not require further adjustment. If
adjustment becomes necessary, use the following procedure after regulator has been
installed:
Step 1. Remove hole plug located in control knob.
Step 2. Using control knob, apply 100 to 150 psi on downstream side.
Step 3. Turn vent adjusting screw clockwise (located under hole plug) until media
can be heard escaping through vent valve.
Step 4. Turn screw counter-clockwise until media flow stops, plus 1/2 turn. Replace
hole plug.
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