The pneumatic cryogenic extended stem ball valve is a pneumatic ball valve specially designed for low-temperature and cryogenic medium transmission as well as automatic shut-off service. It adopts an extended stem / extended bonnet structure to effectively isolate components such as the valve packing and pneumatic actuator from the cryogenic medium zone.
It is mainly applied in the storage, transportation and process control systems for liquid nitrogen, liquid oxygen, liquid argon, LNG and other cryogenic media, and widely used in natural gas, petrochemical, air separation, cryogenic storage tank, industrial gas and other industries.
Working Principle of Pneumatic Cryogenic Ball Valve
The pneumatic cryogenic extended stem ball valve is driven by a pneumatic actuator. Clean compressed air drives the valve stem and ball to rotate by 90 degrees for full opening or full closing of the valve. The extended stem forms a heat insulation buffer section to block the conduction of low-temperature media to the packing box and actuator, preventing freezing and failure of sealing components. When the ball bore aligns with the pipeline, the medium flows through; rotating the ball by 90 degrees shuts off the medium.
The valve can be equipped with solenoid valves, limit switches and other accessories for remote automatic control and valve position feedback. A single-acting actuator can be selected to realize fail-safe reset upon air loss and ensure stable operation under cryogenic working conditions.
Pneumatic Shut‑off Ball Valve are 0‑90° rotary valves. They utilize pneumatic actuators to convert compressed air into rotary motion, delivering fast and reliable valve opening and closing for industrial process control.
According to specific application requirements, pneumatic ball valves can be equipped with solenoid valves, limit switches, position feedback devices, air filter‑regulators, valve positioners and other pneumatic instrument accessories to realize automatic valve control and remote monitoring functions.
Many factors shall be considered when selecting a pneumatic ball valve, including valve size, pressure rating, operating temperature, process medium, flow rate, body material, seat material, actuator type and control mode.
If you are looking for a qualified manufacturer or supplier of pneumatic ball valves, please contact our technical team and provide your operating conditions. Our valve engineers will recommend suitable pneumatic ball valves, actuators and control accessories based on your specific application requirements. （Unit: mm）
| NPS | DN | Type/Class | Part No | D | D1 | D2 | C | t | L | H | W | A | B | R | r | K*K | H-H | h | N-φz | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0.5 | 15 | DQ641-150LB | DQ641150XLX05 | 90 | 60.3 | 35.1 | 9.6 | 2 | 130 | 50 | 140 | 50 | 36 | 3.5 | 3 | 9*9 | 60 | 9 | 4-16 | |
| 0.75 | 20 | DQ641-150LB | DQ641150XLX075 | 100 | 69.9 | 42.9 | 11.2 | 2 | 130 | 54 | 140 | 50 | 36 | 3.5 | 3 | 9*9 | 60 | 9 | 4-16 | |
| 1 | 25 | DQ641-150LB | DQ641150XLX1 | 110 | 79.4 | 50.8 | 12.7 | 2 | 140 | 61 | 170 | 70 | 50 | 4.5 | 3.5 | 11*11 | 65 | 11 | 4-16 | |
| 1.25 | 32 | DQ641-150LB | DQ641150XLX125 | 115 | 88.9 | 63.5 | 14.3 | 2 | 165 | 74 | 170 | 70 | 50 | 4.5 | 3.5 | 11*11 | 65 | 11 | 4-16 | |
| 1.5 | 40 | DQ641-150LB | DQ641150XLX15 | 125 | 98.4 | 73.0 | 15.9 | 3 | 165 | 78 | 200 | 70 | 50 | 4.5 | 3.5 | 14*14 | 80 | 14 | 4-16 | |
| 2 | 50 | DQ641-150LB | DQ641150XLX2 | 150 | 120.7 | 91.9 | 17.5 | 3 | 203 | 82 | 200 | 70 | 50 | 4.5 | 3.5 | 14*14 | 80 | 14 | 4-18 | |
| 2.5 | 65 | DQ641-150LB | DQ641150XLX25 | 180 | 139.7 | 104.6 | 20.7 | 3 | 222 | 112 | 300 | 102 | 70 | 5.5 | 4.5 | 17*17 | 100 | 17 | 4-18 | |
| 3 | 80 | DQ641-150LB | DQ641150XLX3 | 190 | 152.4 | 127.0 | 22.3 | 3 | 241 | 120 | 300 | 102 | 70 | 5.5 | 4.5 | 17*17 | 100 | 17 | 4-18 | |
| 4 | 100 | DQ641-150LB | DQ641150XLX4 | 230 | 190.5 | 157.2 | 22.3 | 3 | 305 | 144 | 300 | 102 | 70 | 5.5 | 4.5 | 17*17 | 100 | 17 | 8-18 | |
| 1 | 15 | DQ641-300LB | DQ641150XLX05 | 95 | 66.7 | 35.1 | 12.7 | 2 | 140 | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | |
| 1 | 20 | DQ641-300LB | DQ641150XLX075 | 115 | 82.6 | 42.9 | 14.3 | 2 | 152 | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | |
| 1 | 25 | DQ641-300LB | DQ641150XLX1 | 125 | 88.9 | 50.8 | 15.9 | 2 | 165 | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | |
| 1 | 32 | DQ641-300LB | DQ641150XLX125 | 135 | 98.4 | 63.5 | 17.5 | 2 | 178 | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | |
| 2 | 40 | DQ641-300LB | DQ641150XLX15 | 155 | 114.3 | 73.0 | 19.1 | 2 | 190 | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | |
| 2 | 50 | DQ641-300LB | DQ641150XLX2 | 165 | 127.0 | 91.9 | 20.7 | 2 | 216 | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | |
| 3 | 65 | DQ641-300LB | DQ641150XLX25 | 190 | 149.2 | 104.6 | 23.9 | 2 | 241 | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | |
| 3 | 80 | DQ641-300LB | DQ641150XLX3 | 210 | 168.3 | 127.0 | 27.0 | 2 | 283 | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | |
| 4 | 100 | DQ641-300LB | DQ641150XLX4 | 255 | 200.0 | 157.2 | 30.2 | 2 | 305 | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD | TBD |
Featuring an extended stem structure for cryogenic applications, this valve delivers reliable low-temperature sealing and fast pneumatic on-off operation. Its straight-through passage reduces flow resistance and lessens frosting interference with valve actuation. Suitable for a wide range of cryogenic media, it supports flexible automation setup with optional fail-safe modes.
