使用减压调整器或单个的控制阀来安全地从钢瓶中排出气体。采用止回阀，防止回流入钢瓶。
Use a pressure reducing regulator or separate control valve to safely discharge gas from cylinders. Use a check valve to prevent reverse flow into the cylinder.
在这种位置，安全阀位于第一止回阀下面，使得这个区能够通过安全阀出口排放。
This positions the relief valve below the first check valve, enabling the zone to drain through the relief valve outlet.
要求：压差安全阀必须具有将两个止回阀之间的“区域”压力维持在比供应压力低至少2 P SI的功能。
Requirements: the pressure differential relief valve must operate to maintain the "zone" between the two check valves at least 2 PSI less than the supply pressure.
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