ZFV API butterfly valve. The valve’s worm gear operated stainless steel valve. 28 inch class 300LB. The valve design and manufacture according to API609, connectional dimension according to ASME B16.5, test and inspect as per API 598. Other manufacturing features as beow :
* Full LUG ends
* Gear box with reducer
* Torque 3680/N.m
* Triple offset design
* Laminated stainless steel 316 + graphite layer
* No Need Extended Stem
* Suitable Temperature : -29℃ ~ 325℃
* Pressure rate < 5.0Mpa
* Suitable service : Acid corrosive service suitable
* Provide Matching Flanges and bolts
* Material : Body A351 CF8, disc A351 CF8, disc seal SS316+gra. , stem A182 F304.
* Standard : Design and manufacture API 609, F-F dimension API 609, end flanges dimension ANSI B16.5, test & inspection as API 598
The hydrostatic tests shall be carried out as per standard : shell strength, high pressure hydro sealing, low pressure air test.
The pressure rate listed as below :
Shell strenth test, apply pressure 1.5 time as design pressure
High pressure hydro sealing test, apply 1.1 time as design pressure
Low pressure air test, apply 0.6Mpa pressure.
Take 300LB valve as example :
Shell strenth test, 7.5Mpa;
High pressure hydro sealing test, 5.5Mpa;
Low pressure air test, 0.6Mpa .