Open needle valve "b" and vent or bypass needle valve, bleeding to atmosphere, then closing needle valve "b" restores the system to a normal static condition.
开启针形阀“B”和排气或旁路针形阀，排放到大气中，然后关闭针形阀“B”，将系统恢复到正常的静止状态。
HART institutions: automatic control under normal circumstances you can not manually open and close the valve.
手操机构：自动控制在不正常情况下可以手动操作阀门的启闭。
Open furnace bottom, increase steam charging steam valve to ensure normal pressure quantity of gas stove.
开启炉底蒸汽阀，增大蒸汽入炉量以确保煤气炉正常压力。
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