The tests show that the asymmetry of the pneumatic electromagnetic valve is the primary factor forming uncertainty of changeover system.
试验结果证明了气动电磁阀工作非对称性是换向器系统不确定度的主要来源。
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。
Electromagnetic valve of pneumatic system adopts conflux boards so as to reduce space.
气动系统电磁换向阀采用汇流板集装方式，减少了占用空间；
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