valvedv.给 ... 装阀adj.有阀的valven.瓣膜；真空管；阀门；电子管valve noise电子管噪声valve rocks气门摇臂,阀摇杆valve board筏板valve point阀点valve surge气门颤动valve knock气门敲击声valve drain气阀机构valve train气阀机构valve tubes[医] 真空整流管Valved tube阀门管

1. The valve chamber cover is missing.
   阀室盖不见了。