surplus valve 溢流阀 ; 滚流阀
Vacancy board use sites: When the base over electromagnetic (pneumatic) valve use the number, to use surplus space will board seat temporarily sealed.
空位板使用场所：当底座数目超过电磁(气动)阀使用数目时，可先用空位板将多余阀座暂时密封。
The pressure limit valve is still used to cover the steam nozzle for ensuring the surplus steam to exhaust freely.
汽嘴之上仍用压阀扣上，以保证多余的蒸汽能自由排放。
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