H44W不銹鋼美標旋啟式止回閥的功能是用來防止管路中的介質倒流。止回閥屬于自動閥類，啟閉件靠流動介質的力量自行開啟 或關閉。止回閥只用于介質單向流動的管路上，阻止介質回流，以防發生事故。 

上海玉武不銹鋼閥門系列
 
Z41W-150Lb不銹鋼美標閘閥 J41W不銹鋼截止閥 J41W不銹鋼法蘭截止閥
不銹鋼柱塞閥 D671F-16P不銹鋼氣動蝶閥 不銹鋼視鏡
不銹鋼氣動放料閥 不銹鋼液動切斷閥 J41W美標不銹鋼截止閥
J41W-40P不銹鋼截止閥 J41W-300Lb不銹鋼美標截止閥 G41W不銹鋼隔膜閥
D73W-16P不銹鋼對夾蝶閥 SG41W不銹鋼美標過濾器 J41W不銹鋼美標截止閥
D343W-16P不銹鋼法蘭蝶閥 QG41W-150Lb美標不銹鋼過濾器 H44W不銹鋼止回閥
D371F-10P不銹鋼軟密封碟閥 Z641W-16P不銹鋼氣動閘門 Z41W不銹鋼閘門
Z41W-100P不銹鋼閘閥 Z43F-64P不銹鋼平板閥 D673W不銹鋼氣動碟閥
Q41F-150Lb不銹鋼美標球閥 不銹鋼旋塞閥 D371F不銹鋼對夾碟閥
D71F-150Lb不銹鋼美標蝶閥 Z641E不銹鋼氣動閘伐 Z41W不銹鋼閘閥
CS11H-16P不銹鋼疏水閥 不銹鋼切斷閥 Z941W-40P不銹鋼電動閘閥
Z641W-25P不銹鋼氣動閘閥 Z41W-600Lb不銹鋼美標閘伐 Q41F不銹鋼球閥
Q11F-25P不銹鋼絲口球閥 Q941F-150Lb不銹鋼電動球閥 D343H-16P不銹鋼法蘭碟閥
Y43W-40P不銹鋼減壓閥 D343W不銹鋼密封蝶閥 J41W-600Lb美標不銹鋼截止閥
Z41W-64P不銹鋼電動閘伐 H42F不銹鋼底閥 Q71F-16P不銹鋼球閥
SG41W-16P不銹鋼過濾器 Z941W不銹鋼電動閘門 CS41W不銹鋼疏水閥
H12W-16P絲扣止回閥 Z941W-160不銹鋼電動閘閥 Z41W不銹鋼閘閥
Q341F不銹鋼蝸輪球閥 Q41F不銹鋼球閥 J41W不銹鋼截止閥
J941H不銹鋼電動截止閥 J941Y不銹鋼電動截止閥 J941W不銹鋼電動截止閥
H42不銹鋼底閥 H45不銹鋼底閥 H42不銹鋼底閥
H12不銹鋼底閥 BZ41W 不銹鋼保溫閘閥 不銹鋼Y型過濾器(法蘭)
H44H-16P不銹鋼止回閥 H42H-16P不銹鋼止回閥 H41H-16P不銹鋼止回閥