Valverden.巴尔韦德(位于加那；西经 17º55' 北纬 27º48')valven.瓣膜；真空管；阀门；电子管valve guide bushing阀导衬套valve head diameter气门头外径Valve Lash Adjuster气门间隙调节器又称液压挺杆valves of the heart心脏瓣valve spindle guide阀杆导程valve spring holder气门弹簧座圈valve lever bracket气门摇臂支架valve split collets气门锁片valve-seat jacket气门座水套valveless micropump无阀微泵