ANSI Z21.15a-2012 pdf download Manually Operated Gas Valves For Appliances, Appliance Connector Valves And Hose End Valves
1.2 General
1.2.2
The manufacturer shall specify the following information:
a. Type of valve or device (see Part IV, Definitions);
b. Maximum and minimum ambient temperature;
c. Capacity (separate capacities may be furnished for both settings of a universal gas burner valve);
d. Low-setting throughput(s), if applicable (separate throughputs may be furnished for both settings of a universal gas burner valve); and
e. Whether or not the valve has a non-displaceable member.
1.6 Valve Stop And Latches
1.6.3
A valve having an intermediate “off” position between two “on” positions shall be so constructed that it will become latched in the “off’”position. A universal gas burner valve shall have integral provisions to show that only one “off” position exists when the valve is adjusted for each of the selected gas settings.
1.6.4
Latching type valves shall be capable of withstanding the following torques applied against the latching means without damage, which could result in the unseating of the valve member, and on a universal gas burner valve, resulting in a change in gas setting.
1.8 Universal Gas Burner Valves
A universal gas burner valve shall be designed so that it can be changed from one gas setting to another gas setting with no intermediate settings and without addition, deletion, or substitution of parts.
Changing from one gas setting to another shall require the use of a tool.
(Current 1.8, Strength, through 1.10, Assembly, become 1.9 through 1.11, respectively, unchanged.)
1.12 Instruction
For a universal gas burner valve, the manufacturer shall provide printed instructions and diagrams (intended for the OEM appliance manufacturer) for the proper method of switching the valve from one gas setting to the other.
1.13 Marking
1.13.7
A universal gas burner valve shall be clearly marked at each position to indicate the gas that the valve is set to control. Abbreviations may be used: for example, “Nat” for natural gas and “LP” for propane gas. This marking shall be visible during the act of switching from one gas to the other and shall be incorporated on the valve.

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