First, use: 
 900 Series DIN safety valve is mainly used for oil, gas, chemicals, electricity, city gas and other fields, as overpressure protection device, with a movement of high precision, good repeatability, the back seat accurate, and easy maintenance. 

 Second, the main connection size: 
 Model 
 Nominal 
 Body material 
 DN 
 Operating temperature 

 35.901/902/911/912 
 PN40/16 
 Cast steel 1.0619 + N 
 DN20/32 ~ DN150/250 
 -10 ℃ ~ +450 ℃ 

 55.901/911 
 PN40/16 
 Stainless steel 1.4408 
 DN20/32 ~ DN100/150 
 -60 ℃ ~ +400 ℃ 


 DN 
 20/32 
 25/40 
 32/50 
 40/65 
 50/80 
 65/100 
 80/125 
 100/150 
 125/200 
 150/250 

 Circulation aperture do (mm) 
 18 
 22 
 29 
 36 
 45 
 58 
 72 
 80 
 100 
 125 

 Circulation area Ao (mm) 
 254 
 398 
 661 
 1018 
 1590 
 2688 
 4072 
 6362 
 8825 
 12266 

 Weight (Kg) 
 8.5 
 10 
 14 
 20 
 28 
 40 
 53 
 80 
 125 
 165