La description

Features: ①small-size, convenient, easy to assemble and disassemble, maintenance, fix at any positions ②simple-structure、compact, quick *0 degrees on-off operation, small operating torque, light and handy. ③more than then thousand times of on-off experiment, longer operating life. ④almost linear flow characteristic, better regulating performance. ⑤full sealed, zero gas leakage. ⑥different materials in every parts, suitable to different mediums.