Emerson TESCOM - Page 14

14
TESCOM™ Safety, Installation, Operations & Service Manual
Content
December 2020
Installation Manual
TR000238ENUS-01_12-20
7. Dome/Spring Combination and Dome Loaded Regulators are more easily
reassembledbyholdingregulatorrmlyinviseandreinstallingdome.
8. Self-Venting Regulator - If your regulator has an adjustable vent valve mechanism, it is
setonnal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Turnscrewcounter-clockwiseuntilmediaowstops,plus1/2turn.
Replace hole plug.
9. Reinstallingwiremeshinletlter-Insertlterintoprimaryinletport.Itmustthen
beexpandedtotcorrectly.Thiscanbeaccomplishedbyinsertingametaltoolthe
same size as the port and then lightly tapping it with a hammer.
WARNING
After regulator has been reassembled, it should 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 - Diaphragm-Sensed
General
TESCOM’sdiaphragm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
500 psig.
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 back pressure of a
regulator.
Control Knob: Back pressure is increased by turning the control knob. The control knob
applies a load through a spring to the diaphragm.
Dome Load: Back 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: Back pressure is increased by applying a spring force as
well as the introduction of pressurized gas or liquid.
3.3.1
3.3.2
3.3