Valverdo巴尔韦多valven.瓣膜；真空管；阀门；电子管Valve head line- type阀头线型valve control mechanism阀门控制机构valve rocker arm washer阀摇杆垫圈valve spring compressor气门弹簧压缩工具valve-lifting plunger气门挺杆valve control machanism气门控制机构valve control amplifier门控放大器valve microphone effect电子管颤噪效应valve- value division阈值分割valve-adjusting means气门调整工具