Page 12 - BEST-Accessory-Technical-Bulletins

Redundant Overpressure Model RR-4,
Protection Regulators for
Model 101A, 101B & 101C Units RR-6, & RR-8

Application
Overpressure Protection
Model RR Redundant Regulators are intended to
satisfy NFPA 496 requirements for preventing the Redundant Regulators
possibility of enclosure over-pressurization due to
excessive protective gas supply pressure. Technical Bulletin RR TB-R0 © 07.20.2018
Each regulator features a removable adjustment
knob to render it tamper-proof at the user’s
discretion. The regulators feature a 0-30 psi gauge,
and when installed upstream of a Model 101A,
101B or 101C Enclosure Pressurization Unit, and
properly calibrated as recommended on page 2,
will serve as an up-stream protective gas supply
safety device.
Model RR Redundant Regulators are identical to
the Enclosure Pressure Control Regulators of the
Units they protect, so the adjustment knobs of both
regulators are interchangeable if needed.

Optional Installation Kits

Model RR Redundant Regulators are suitable for
in-line mounting and may be adequately supported
by threaded pipe headers. All Models are
offered with optional
However, we offer optional industrial grade Mounting Hardware &
mounting hardware and tube fittings to facilitate
the proper installation of these regulators. Tube Fitting Kits!

The kits include a 14 gauge 316 stainless steel
regulator bracket, a regulator mounting ring,
neoprene o-ring sealing screws, neoprene gasket
backed 18-8 stainless steel sealing washers, 316
stainless steel nylon locking nuts and two 316
stainless steel 90 degree elbow tube fittings.

Alternative Solution
In certain circumstances, such as an analyzer
or process measurement meter application, a
protected enclosure may contain other potential
sources of high pressure gases, in either
combustible, flammable or inert compositions.
We therefore offer Model PV Purge Vents
as a viable alternative for protection against
excessive protective gas supply pressure and
over-pressurization due to other sources of
internal overpressure. Consider this alternative if
warranted by your application, and contact a Sales
Associate for more information.
Model PV Vents
can act to relieve
excessive protective
gas supply AND internal
sources of overpressure!

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