亚洲 a v无 码免 费 成 人 a v -一本色综合久久-欧美日韩精品一区二区性色a+v -精品一区二区三区自拍图片区

Function: control fluid flow in one direction to prevent reverse flow, used in fluid system to prevent reverse flow of fluid. Turn it on and off.

Products are widely used in hydraulic station, fluid control and detection system, one-way open, to prevent the fluid medium countercurrent. Simple operation and installation, with high reliability.

Products can be customized according to customer requirements and working environment.