Pneumatic emergency cut-off valve for liquid ammonia
Alternative name: pneumatic liquid ammonia emergency shut-off valve pneumatic emergency shut-off valve liquid ammonia emergency shut-off valve
Model: QDQ421F-25/40P QDQ421F-25/40C
Overview of liquid ammonia pneumatic emergency shut-off valve:
The liquid ammonia pneumatic emergency stop valve, also known as the liquid ammonia pneumatic stop valve, is composed of a straight travel spring piston actuator and a stop valve, and is equipped with a pneumatic triplet and a receiver to provide products that can operate continuously and have stable quality for automatic control engineering. Remote centralized control can meet the needs of computer program control. Now it is widely used in petrochemical industry, gas equipment, electric equipment, environmental water treatment, iron and steel metallurgy, industrial kilns, canned equipment, brewing equipment, drying equipment, vacuum equipment, surface treatment, bio pharmaceutical, food machinery, textile printing and dyeing, paper making and other industries.
Technical specification for liquid ammonia emergency shut-off valve:
| Technical Specification for QDQ421F Series Pneumatic Shut off Valve |
| design basis | GB standard |
| Design Criteria | GB/12233 |
| Structure length | Wafer connection | GB/12221 |
| Connecting flange size | B/9113、JB/T79 |
| Experiment and inspection | GB/T13927、JB/T9092 |
Technical parameters of pneumatic emergency shut-off valve:
| Technical Parameters of QDQ421F Series Pneumatic Shut off Valve |
| Nominal diameter | DN25~300mm |
| Connection mode | flange |
| Cylinder type | Double acting, single acting (spring return) |
| control mode | Switch type |
| Nominal pressure | 16. 25, 40bar (please specify if higher pressure is required) |
| Air supply pressure | Double acting: 4~5bar single acting 4~6 bar |
| Medium temperature | F:-30~80℃ Y:-40~120 |
| ambient temperature | Standard type: - 20~80 ℃ |
| body material | Carbon steel (C), stainless steel (CF8, CF8M) |
| Sealing material | Metal hard seal (H), hard alloy (Y), PTFF (F) |
Pneumatic emergency cut-off valve for liquid ammonia Structural features:
1. The materials are well selected, in line with the relevant national GB/T HB/T standards, with reasonable structure and beautiful appearance.
2. Working conditions with particles or high temperature: valve disc and valve seat sealing surface are made of iron base alloy surfacing or Stellite cobalt base carbide surfacing, with good wear resistance, high temperature resistance, corrosion resistance and scratch resistance. Normal temperature media such as liquid ammonia, ammonia, liquefied gas, and valve disc sealing surface are replaced by PTFE polytetrafluoroethylene.
3. After quenching and tempering and surface nitriding treatment, the valve rod has good corrosion resistance and scratch resistance.
4. Various piping flange standards and flange sealing surface types (raised face, raised face, concave face) can be used to meet various engineering needs and user requirements.
5. The valve body materials are complete. The packing and gasket can be reasonably selected according to the actual working conditions or user requirements, and can be applicable to various pressure, temperature and medium working conditions.
6. The reverse seal is made of threaded connection seal seat or body surfacing austenitic stainless steel, and the seal is reliable. The replacement of filler can be carried out without stopping the machine, which is convenient and quick, and does not affect the system operation.
