Solutions Q&A 11
3.1.2 Pilot operated regulators:
Pilot operated regulators are used in high flow applications and where
access to the main regulator is limited or difficult. This type of regulator does
not have a control spring to regulate, instead an air pilot signal is used to
control the outlet pressure of the main regulator.
This air pilot signal is controlled by a small 'pilot operator' regulator
typically of a precision type eg 11-018. The flow through the pilot operator
is negligible. The better the pilot, the better the performance from the main
regulator.
Main Regulator
Pilot Operator Regulator
The pilot signal for the main regulator valve is usually onto a large diaphragm
area. This results in pilot operated regulators having better regulation
characteristics than spring operated general purpose regulators.
3.1.3 Feedback pilot regulators:
For even greater control of the outlet pressure a 'feedback' pilot operator
can be used. Here the outlet pressure from the pressure critical point in the
system can be fed back to the controlling pilot operated regulator.
Main Regulator
Pilot Operator Regulator
Feedback systems are very responsive to downstream pressure
requirements. If performance does not meet expectations, consult with
Application Engineering.
Very few applications require feedback and it is usually better to recommend
a standard 11-400 or a general purpose regulator as a pilot operator.
3.1.4 Application specific regulators:
IMI Norgren produces a wide range of application specific regulators, each
having some enhanced feature over a general purpose regulator. Some of
them are listed below.
11-018/-118
Extremely accurate outlet pressure control, with
high flow for a precision regulator. Requires oil-free
air, pre-filtered
R38 Instrument regulator, aluminum body (also available
in stainless steel to NACE standard), exellent
regulation, no constant bleed to atmosphere.
R24 Good regulation, extremely high relief capacity.
vailable in spring or pilot operated versions.
R05/R22 General purpose regulators with stainless steel
bodies to NACE specification.
R91 Brass or plastic bodied specifically for water. Potable
and non-potable water options available.
Miniature regulators Generally based around a modification to a basic
R07 including low flow (with improved regulation),
plastic bodied (for water), different elastomeric
materials (for fluid compatibility).
3.2 What can we produce?
? 3.2.1 Does IMI Norgren produce regulators for inlet pressure above 400
psig?
The R18 can accept inlet pressures of up to 450 psig. IMI Norgren has higher
pressure regulators for industrial gases up to 3000 psi. Consult Application
Engineering for details.
? 3.2.2 Do we produce units for low/high temperatures?
Low or high temperature units may be possible in some ranges. Material
selection is critical. Consult IMI Norgren for details.
Note: changing to fkm elastomers does not in itself make a unit suitable for
higher temperatures.
? 3.2.3 Can we produce sub-base regulators?
The R40/R41 pilot and feedback pilot regulators are available.
? 3.2.4 Can we produce manifolding regulators?
Manifolding regulators are designed to have a straight through primary
pressure with secondary outlets at 90 degrees. IMI Norgren has:
• Excelon 72 R72M - manifold using Quikclamps.
• Excelon 74 R74M - manifold using Quikclamps.
