CSA Z21.15a-12 pdf download – CSA Standard for Manually Operated Gas Valves For Appliances, Appliance Connector Valves And Hose End Valves.
2.4.3 Valves having predetermined reproducible low settings shall be capable of maintaining the initial flow setting. Method of Test This test shall be conducted at room temperature. One of the valves tested under 2.4.1 may be used for this test. A valve having a fixed low setting shall be tested as received. If the low setting is adjustable, the valve shall be adjusted to provide a throughput at the low setting within ± 5 percent of the manufacturer’s specified value using butane gas at 1 1 .0 in wc (2.74 kPa) pressure. A valve having adjustable stops for controlling the low setting shall have these stops set with a torque of 1 5 inch-pounds (1 .69 N $ m). Such a valve shall then be cycled 1 00 times at room temperature against the stops with a torque of 1 0 inch-pounds (1 .1 2 N $ m). The throughput at the low setting shall then be rechecked and shall be within ± 20 percent of the initial adjustment. The valve shall then be cycled with the other valves as described under 2.4.1 . After 2000 cycles, and at completion of the cycling test, the throughput at the “low” setting shall be rechecked and shall be within ± 20 percent of the initial adjustment. In each case the rotative position for checking the “low” setting shall be indicated by the particular valve construction, whether by an adjustable rotative stop, a “click,” detent or other indicating means. The universal gas burner valve sample shall be tested for compliance with this provision when set to deliver each gas (i.e. Natural gas setting and LP gas setting). If the wear pattern of the internal parts is different for each gas setting and 2 cycle tests are required, then separate tests shall be performed with the valve set to deliver each gas (i.e. one complete cycle/low setting test with the valve set to Natural and one complete cycle/low setting test with the valve set to LP).
Part IV: Definitions VALVE, MANUALLY-OPERATED GAS – A valve that permits control of the flow of gas from an “off” to an “on” position by means of hand operations (manual control). Some specific types are: 1 . Appliance Main Gas Valve. A manually-operated gas valve used as part of an appliance for turning the main burner gas (or main burner and pilot gas) on and off. The valve is turned on when the appliance is put into service and turned off to shut the appliance down; 2. Gas Burner Valve. A manually-operated gas valve used as part of an appliance which requires user initiation of each usage cycle. The valve is turned on when the appliance usage cycle is initiated and turned off when the appliance usage cycle is completed; 3. Universal Gas Burner Valve. A gas burner valve for use in outdoor gas appliance applications with provisions for two gases having different heating values which can be changed from one gas setting to another gas setting with no intermediate selection settings and without the addition, deletion or substitution of parts. A universal gas burner valve requires no physical interaction with the appliance burner orifices to facilitate the changing from one gas setting to the other and has integral provisions to ensure only one “off” position exists when adjusted for each of the selected gas settings. 4. Appliance Connector Valve. A manually-operated gas valve having a non-displaceable valve member, a minimum specified capacity (code marked on the valve), an internal taper pipe thread inlet and an outlet for flared tubing connection. An appliance connector valve is intended to be used between the gas supply piping and the appliance connector attached to the appliance;CSA Z21.15a-12 pdf download.
