... gas. The cool blast from ventilation hole applies to balance the flame temperature, so as to prevent heat loss ... Butterfly Valve, Swiss BELIMO / Japanese ULLI / KISAWAR Series Electronic Actuator, Japanese ULLI Fuel Regulator Valve, Gas/Oil/Air Pressure ... Germany Testo Flue Gas Analyzer, High-speed Pulse Gas Burner, Flow Meter, Leakage Protector, High-Accuracy Electronic Pressure Gauge, Fuel Power Wind ...