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UL 132 standard
MARKING
20 General
20.1 Each valve shall be legibly and permanently marked to show:
a) The manufacturer's or vendor's name or trademark.
b) A catalog number or similar identification to specifically identify the valve.
c) The predetermined set pressure in pounds-per-square-inch-gauge.
20.2 Each safety valve shall also be legibly and permanently marked to show:
a) The flow capacity in cubic-feet-per-minute of air at a temperature of 15.6�C (60�F) and at a pressure of 14.7 psia. The word "Air" shall appear as a suffix to the numerical flow capacity. See 20.3.
b) The month and year the valve was assembled and adjusted.
20.3 With reference to 20.2(a), a safety valve marked "250-4050 Air," for example, indicates that the valve has a set pressure of 250 pounds-per-square-inch-gauge (psig) and that its flow capacity under test conditions is 4050 cubic-feet-per-minute of air.
20.4 When a safety valve is installed in a multiple-head unit or a manifold by the manufacturer and is flow-tested upon installation, the marking required by 20.1 and 20.2 shall appear on the head unit or manifold.
20.5 When a manufacturer produces valves at more than one factory, each valve shall have a distinctive marking to identify it as the product of a particular factory.
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