Emerson TESCOM - Page 16

16
TESCOM™ Safety, Installation, Operations & Service Manual
Content
December 2020
Installation Manual
TR000238ENUS-01_12-20
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specications.
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owstreammustbefreeof
particles which could prevent proper seating of the main valve.
3. Applyathinuniformcoatingofuorocarbon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.
WARNING
Do not apply any type of grease to threaded internal parts of regulators that come
standard with metal to metal diaphragm seals. Regulators with metal to metal diaphragm
seals have Metal listed as the diaphragm material on their installation drawing.
NOTE: Do NOT apply any type of grease to the inlet or outlet connections.
4. Valve seat must be installed with the chamfered side towards the valve.
5. Standard Regulator with Control Knob - 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 bonnet will be the diaphragm. It can be
centered on the seating surface of the bonnet before the body assembly is inverted
andscrewedintothebonnetrmly–handtight.The44-2300isanexception.Inthis
case stack the diaphragm, diaphragm back up plate, load spring and spring button
ontopofthebody.Lowerthebonnetandscrewthebonnetontothebodyrmly-
hand tight. Regulator should then be placed in vise and bonnet re-torqued to correct
specications.SeeAssemblyDrawing.
6. Dome/Combination Spring and Dome Loaded Regulators are more easily
reassembledbyholdingregulatorrmlyinviseandreinstallingdome.
WARNING
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.
Back Pressure Regulators - Piston-Sensed
General
TESCOMpistonsensedbackpressureregulatorsarespecicallyengineeredfor
applications requiring dependable pressure regulation. These regulators are especially
appropriate for installations where the system or process requires the pressure to be
limited to a maximum pressure. The control pressure range can be up to a maximum of
20,000 psi.
3.3.5
3.4.1
3.4