List of components: a valve body 2, seat 3, disc, stem, one uses 
 Seal material code 
 Suitable temperature 
 Suitable medium 
 NR 
 ≤ 85 ° C 
 Water, air, acid and alkali 
 CR 
 ≤ 85 ° C 
 Water, gas, acid and alkali 
 NBR 
 ≤ 100 ° C 
 Water, oil 
 CPDM 
 ≤ 120 ℃ 
 Water, steam, and general acid-base class 
 FKM 
 ≤ 150 ° C 
 Water, steam, strong acids, alkalis 
 Second, the material 
 Body 
 Cast iron, ductile iron, carbon steel, stainless steel 
 Disc 
 Cast iron, ductile iron, carbon steel, stainless steel, carbon steel fully coated with rubber or fluorine plastic 
 Stem 
 Carbon steel nickel-phosphorus plating, stainless steel 
 Seat ring 
 Natural rubber, NR, neoprene CR, NBR NBR, EPDM rubber, EPDM, Viton FKM 
 Pneumatic devices 
 Assembly 
 Pressure rating: PN (MPa) 1.0 1.6 
 Third, the test lining: spark detection 
 Testing and examination of GB/T13927 standard 
 Nominal pressure: PN (MPa) 
 Body: PN × 1.5 
 Seal: PN × 1.1 
 Optional accessories: Worm device, pneumatic device, electrical device, the main size parameters