B16.44 does not apply to manually-operated gas valves which are an integral part of a gas appliance. Manually-operated integral gas valves are subject to the American National Standard for Manually Operated Gas Valves for Appliances, Appliance Connector Valves, and Hose End Valves, ANSI Z21.15/CGA 9.1 ANSI Z21.15 states that "
A permanent marking specifying the maximum pressure rating of ½
(3.5 KPa) shall be provided on each valve".
Understandably, folks tend to get tripped up with regard to the two markings mentioned above, given the valve’s overall design rating of 600 psig Water, Oil or Gas. Certifications for both standards are done by The CSA Group.
For more information or clarification, contact your Milwaukee Valve or Hammond Valve customer service rep today.