Emerson Tescom ER5000 Series, User Manual, Page: 52 / 248

ER5000 —
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Glossary of Terms
Terms Relating to Regulators
Accuracy
The acceptable level of pressure variation for a Regulator under
steady state conditions within its control range. All physical and
mechanical processes have some level of variation.
Air Actuated
Also known as Air Loaded: one type of loading element for a
pressure
Regulator . Utilizes low pressure gas as the Loading
Element (Loading Force) , typically 0–80 psig / 0–5.5 bar. This
is a form of ratio loading: the regulator uses low Pilot Pressure
to regulate a Control Pressure that may be much higher (see
Ratio Actuator) . The most common type of regulator used with
the ER5000, as it is the only type that can be used for control
pressures greater than 100 psig / 6.9 bar.
Captured Venting
Feature incorporated in some venting Regulators which provides
an additional port that can be connected to piping in order to safely
dispose of excess liquid or gas expelled by the regulator’s vent valve.
The vent port should never be plugged. Not all venting regulators
have this feature. Refer to
Venting Regulator .
Control Element
One of the three basic elements of a Regulator . Acts to reduce high
Inlet Pressure to a lower working pressure ( Outlet Pressure) . The
control element is sometimes called the main valve, valve stem
or poppet.
Control Pressure
The component of System Pressure that is the result of the
regulating action of the Regulator . Can be either the Outlet Pressure
or the Inlet Pressure , depending on the type of regulator. For a
pressure reducing regulator, the control pressure is the Outlet
pressure. For a back pressure regulator, the control pressure is the
Inlet pressure.