Cast Steel and Stainless Steel Gate Valve

Api gate valve
main parts and materials
parts name materials
valve body、bonnet、disc a216 wcb a352 lcb、a217 wc6、a217 wc9、a217 c5、a351 cf8 a351 cf8m a351 cf3 a351 cf3m
stem a182 f6 a182 f304 a182 f316 a182 f304l a182 f316l
seat ring a105+13cr、a105+stl、a351 cf8、a351 cf8m
disc ring 13cr、stl、a351 cf8、cf8m
standards
design and manufacture face to face flange end inspection ansi pressure-temp rating
api600,ansi b16.34 ansi b16.10 ansi b16.5 api 598 ansi b16.34
test pressure
test item shell test seal test back seal test air seal test
medium(mpa) water(mpa) air(mpa) 
   pressure
  (class) 150 3.1 2.2 2.2 0.5-0.7
300 7.8 5.6 5.6
600 15.3 11.2 11.2
900 23.1 16.8 16.8.