[机] auxiliary valve
... auxiliary changeover valve辅助切换阀 auxiliary valve辅助阀(暖汽调整阀用) back valve回动阀,止回阀,逆止阀,单向阀 ...
by-pass valve
... 蝶形节流阀 butterfly throttle valve 旁通阀, 辅助阀, 回流阀 by-pass valve 旁通阀, 辅助阀, 回流阀 by-path valve ...
booster valve
... bonnet valve 帽状阀 booster valve 辅助阀 bottom discharge valve 底部排料阀 ...