... tosuit application requirements. SpecificationsType of gas: Natural gas, propane, propane/butane, butane, town gas, coke oven gas, other gases on requestFlame shapes: ... a built-in limiting orifice valve for gas flow adjustment,gas metering orifice for set-up and tuning, ... proportional applicationsOptional features– Internal pilot with separate air and gas (L version)– Turndown 650:1– Control with UV ...