Installation Instructions

Description
a) A piping system for use at gas pressures exceeding 1/2 psi (3.45kPa), but intended to serve equipment
rated for 1/2” psi (3.45 kPa) maximum, shall include a gas pressure regulator to limit the downstream
supply pressure to 1/2” psi (3.45 kPa), and the installation instructions for the piping system shall specify
that such a regulator shall be installed. For system pressures up to 5 psi (34.5 kPa), the regulator shall
incorporated construction which will “lock up” under no-flow conditions to prevent excessive downstream
pressure build-up. Pressure Drop from Bends and shall comply with the applicable provisions of the
Standard for Line Pressure Regulators, ANSI Z21.80 • CSA 6.22. For system pressures above 5 psi (34.5
kPa), the regulator shall comply with a recognized national standard for pressure regulators.
b) The Maxitrol 325 Series regulator, supplied by Pro-Flex
®
supplies the highest performance as both Line
Pressure Regulator and Gas Appliance Regulator. They feature precise regulating control from full flow
down to pilot flows. They can be used as a single stage regulator, reducing pounds pressure to
normal burner pressure. They can also be used as a line regulator on equipment already fitted with an
appliance regulator.
c) The materials of all component parts are carefully selected and corrosion resistant. The housings are
made of durable die cast aluminum, the diaphragm and self-aligning valve seat are made of nitrile
rubber which is selected to work at ambient temperatures of -40 to 205 degrees F (-40 to 96 degrees
C). All regulators are supplied with vent limiting devices that are made of brass and threaded with a
type “0” (NPT Thread).
Sizing Instructions
a) Line Pressure Regulator Selection
The Maxitrol Regulator is typically used in a 2 or 5 PSI gas piping installation to reduce supply pressure to
the appliance within required operating ranges (typically 4” - 7” WC. natural gas or 10” - 11” LP gas).
To select the correct regulator for pressure regulation, the following information must be established;
• Available inlet pressure range at the regulator inlet
• Desired outlet pressure
• Required maximum flow rate
• Refer to tables (Page 33) to select the correct regulator to satisfy system requirements.
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4.8 Pressure Regulators
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