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UL 125 Standard for marking requirements
28 General
28.1 Each valve shall be marked with the following:
a) The manufacturer's or private labeler's name or identifying symbol,
b) A distinctive catalog number or the equivalent,
c) The rated service pressure when in excess of 250 psi (1.7 MPa), and
d) The direction of flow, when not evident.
28.2 Each excess flow valve shall be marked with its rated closing flow capacity in gallons per minute (m3/s) of liquid anhydrous ammonia or LP-Gas (propane), or both, when appropriate. When the rated closing flow used to determine compliance with 21.1 is dependent upon mounting position, the marking shall include reference to the direction of flow.
28.3 All markings shall be legible and permanent, such as afforded by metal stamping, by molding in a casting, or by a metal nameplate.
Exception: The marking required by 28.5 is not required to be permanent.
28.4 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.
28.5 Valves constructed using pipe thread in accordance with the Exception to 6.2 shall be provided with a tag, label, or similar marking on the product or smallest unit package, identifying the pipe thread type for the installer.
UL 125 Standard for marking requirements end
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