SL10/20/30PA/PB/GA/GB-30/40B 单向阀是流体只能沿进水口流动，出水口介质却无法回流，俗称单向阀。单向阀又称止回阀或逆止阀。用于液压系统中防止油流反向流动,或者用于气动系统中防止压缩空气逆向流动。单向阀有直通式和直角式两种。直通式单向阀用螺纹连接安装在管路上。直角式单向阀有螺纹连接、板式连接和法兰连接三种形式。 SL10PA-30B,SL10PB-30B,SL20PA-30B, SL20PB-30B,SL30PA-30B,SL30PB-30B, SL10PA-40B,SL10PB-40B,SL20PA-40B, SL20PB-40B,SL30PA-40B,SL30PB-40B, SL10GA-30B,SL10GB-30B,SL15GA-30B, SL15GB-30B,SL20GA-30B,SL20GB-30B, SL25GA-30B,SL30GB-30B,SL10GA-40B, SL10GB-40B,SL15GA-40B,SL20GB-40B,