Detailed introduction to pneumatic diaphragm low temperature type regulating valve:
low temperature type, the valve using long-necked tube and bellow sealed structure which can be used for cryogenic -196 occasions
♦ Main technical parameters: 
1) nominal size: DN 20-200mm (3/4"~8)
2) nominal pressure: PNMPa1.6\4.0\6.410.0 (ASME Class:150/300/400/600) 
3) leakage class: ANSI IV/V/VI
4) flow characteristics: equal percentage, linear