Back Pressure Regulators - Piston-Sensed - Emerson TESCOM 04 Series Safety, Installation, Operations & Service

Safety, Installation, Operations & Service Manual
DOPSM2080X012
Do not apply any type of grease to threaded internal parts of regulators that come
standard with metal to metal diaphragm seals. These models include the following
regulator series: 44-2300, 44-2500, 44-2900 and 44-4700.
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 firmly – 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 firmly-
hand tight. Regulator should then be placed in vise and bonnet re-torqued to correct
specifications. See Assembly Drawing.
6. Dome/Combination Spring and Dome Loaded Regulators are more easily reassembled
by holding regulator firmly in vise and reinstalling dome.
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.
3.5

Back Pressure Regulators - Piston-Sensed

3.5.1 General
TESCOM™ piston 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
20,000 psi.
3.5.2 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.
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Section 3
Rev. 06/15