Features: 1) Low friction coefficient between the core and valve seat, low operating torque 2) Provided with valve rod anti-flying structure and fireproof structure 3) Electrostatic-resistant function and sealing cutting-off function 4) Suitable for various pure liquid mediums 5) Nominal bore: 1/2-20" 6) Nominal pressure: ANSI150-300Lb 7) Temperature range: -40-180o C 8) Transmission type: worm, lever 9) Optional material: WCB 304 316 316L