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Section 3
Rev. 06/15
Safety, Installation, Operations & Service Manual
DOPSM2080X012
Step 4. Turn screw CCW until media flow stops, plus 1/2 turn. Replace hole plug.
8. Reinstalling wire mesh inlet filter: Insert filter into primary inlet port. It then must 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 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.
3.3 Pressure Reducing Regulators - Piston-Sensed
3.3.1 General
TESCOM™ piston sensed pressure reducing regulators are specifically engineered for
applications requiring dependable pressure regulation. These regulators are especially
appropriate for installations where high system pressures (up to 20,000 psi) must be
reduced to levels suitable for actuating low pressure (0 to 20,000 psi) instruments and
related equipment.
3.3.2 Pressure Activation Methods
TESCOM uses four 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 piston.
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.
Air Actuated (Multiplier): Delivery pressure is controlled by applying 0-100 psig pilot
pressure to the air actuator, resulting in full outlet pressure range control.
3.3.3 Operation (Control Knob Adjustment)
Controlled outlet pressure settings are obtained using TESCOM pressure reducing
regulators by adjusting the control knob. Rotating the knob clockwise raises the outlet
pressure while a counterclockwise rotation, coupled with venting of the downstream side
of the regulator plumbing, lowers the outlet pressure. Final adjustments should be made in
the direction of increasing pressure to obtain the most accurate set point.
TESCOM regulators will operate with any liquid or gaseous media compatible with the
wetted materials. Some series/modifications come with an internal filter that only are
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.
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