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Section 3
Rev. 06/15
Safety, Installation, Operations & Service Manual
DOPSM2080X012
8. 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 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.
3.4 Back Pressure Regulators - Diaphragm-Sensed
3.4.1 General
TESCOM’s diaphragm sensed back pressure regulators are specifically 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.
3.4.2 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.
3.4.3 Operation (Control Knob Adjustment)
Controlled back pressure settings are obtained using TESCOM back pressure regulators
by adjusting the control knob. Rotating the knob clockwise raises the back pressure while
a counterclockwise rotation will lower the back pressure. Final adjustments should be
made in the direction of increasing pressure to obtain the most accurate back pressure set
pressure.
TESCOM regulators will operate with any liquid or gaseous media compatible with the
wetted materials. Some series/modifications come with an internal filter designed to
stop random contamination resulting from the installation of the regulator. An auxiliary
upstream filter is recommended for use in all but the cleanest media. Gaseous media
should be free of excessive moisture to prevent icing of the regulator at high flow rates.
A back pressure regulator is not intended to be used as a system safety relief device.
When the regulator is not in use, the inlet pressure should be turned off.
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