Gas tap has two valves biased towards closed position by springs, spring on downstream valve having less tensile force than upstream spring and control knob on downstream valve being remotely controlled

摘要

The gas tap has two valves (23, 24) which are biased towards the closed position by springs (38, 44). The spring (44) on the downstream valve has less tensile force than the upstream spring. The control knob (34) on the downstream valve is remotely controlled