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TESCOM™ Safety, Installation, Operations & Service Manual
Content
December 2020
Installation Manual
TR000238ENUS-01_12-20
Operations and Service
Assembly/Installation Drawings & Bills Of Material
drawings and parts lists for your product
may be obtained by contacting TESCOM. Tescom will provide these by email, fax or mail.
Your local Tescom representative can provide additional assistance. Be sure to have your
complete model number ready. See page 12 for contact information for the TESCOM
location closest to you.
Stem seal leakage usually results from seal wear, and can usually be corrected by
tightening the bonnet bushing or packing nut. Overtightening can cause high stem
friction, accelerated wear and shortened stem seal life.
WARNING
Information detailed here is generic and applies to a select subset of TESCOM regulators
and valves. Some TESCOM products have detailed, product-specific Installation,
Operations and Service manuals. Please look up the corresponding manual for your
product series on Emerson.com to ensure you are using the appropriate installation &
operations instructions.
Pressure Reducing Regulators -
Diaphragm - Sensed
General
TESCOM’s diaphragm sensed pressure reducing regulators are specifically engineered for
applications requiring dependable pressure regulation. These regulators are especially
ppropriate for installations where high system pressures (up to 6000 psi) must be reduced
to levels suitable for actuating low pressure (28 vac to 500 psi) instruments and related
equipment.
Pressure Activation Methods
TESCOM uses three basic types of activation methods. The activation method provides
the means by which the operator can set the force that determines the outlet pressure of a
regulator.
Control Knob: Delivery pressure is increased by turning the control knob. The control knob
applies a load through a spring to the diaphragm.
Dome Load: Delivery pressure is increased by applying pressurized gas or liquid to the dome
of a regulator at a pressure equal to the outlet pressure desired. This dome pressure is
normally provided by a second regulator called the pilot regulator.
Combination Spring and Dome: Delivery pressure is increased by applying a spring force as
well as the introduction of pressurized gas or liquid.
3
3.1
3.1.1
3.1.2
