1. Use special square air bag to connect solenoid valve directly, reduce damage of solenoid valve diaphragm, stable and reliable operation. 2. High technology and high-quality product, innovative structure, compact technology. 3. Double wind inlet, flexible technology layout and small occupation area. 4. High dust cleaning efficiency is =>99.9%. 5. Filter bags have superfine, temperaturer-resistant, damp-resisting and antistatic for option, users can choose it according to their requirement.