Product features of qb2 flange double port exhaust valve   1. It can discharge the gas in the pipeline, reduce the resistance and save energy; 2. When the pipeline is under negative pressure, the product can quickly and automatically inhale air to prevent pipe rupture; 3. The exhaust capacity is many times that of the common double hole exhaust valve; 4. The floating ball bracket is made of stainless steel, with long service life, safe and reliable;   Technical parameters of qb2 flange double port exhaust valve   Applicable media Applicable temperature Strength test (water) MPa Sealing test (water) MPa body material Floating ball bracket clean water 0~80℃ 1.5 0.05~1.1 cast iron stainless steel   Qb2 flange double port exhaust valve drawing   Main connection dimensions model Nominal diameter Main dimensions（mm） D D1 D2 L Z-Φd QB2-10 40 145 110 85 430 4-Φ18 50 160 125 100 430 4-Φ18 75 195 160 135 470 4-Φ18 100 215 180 155 500 4-Φ18 150 280 240 210 540 8-Φ20 200 335 295 265 700 8-Φ20