Carbon Steel Butterfly Valve Production Quality Control Process

1
Valve Body and Disc Casting
  • With water glass and silica sol 3 casting lines
  • 20 years of casting experience ensures the quality of blank of valve body and disc
  • We own full range of mold
  • Above 10 materials are available, such as WCB, LCB, LCC etc.
  • Spectrometer material test ensures metal elements meet with standard
2
Grinding and Dressing
  • Use sand shaker which enables sand cleaning quickly and thoroughly
  • Protect the casting surface to avoid any damage
3
Waxing and Pickling
  • Hook shot blasting machines and crawler shot blasting machine will do sand-blasting to the valve body and disc
  • Removed the surface oxide skin of valve body and disc
  • Then put into storage prepare for machining and valve assemble
4
Valve Body Machining
  • Regularly inspect tooling and equipment to ensure the accuracy
  • Inspector check quality strictly
  • The unqualified products either be repaired or disposed
5
Valve Disc Machining
  • Check the processing standard of the outer edge R-Arc height and the end face dimension
  • The unqualified products either be repaired or disposed
6
Other Parts Quality Control
  • Rubber Parts: Valve seat and O-ring are purchased through outsourcing
  • Sampling inspection on the coaxiality of the valve seat and valve disc
  • Inspection report must be provided before purchasing to ensure stable quality and performance
  • Metal Parts: Screw, bolt, nut and other accessories like electric actuator and pneumatic actuator are purchased through outsourcing
  • Cooperated with us many years like brother or sister companies, quality is assured
7
Valve Assemble and Testing
  • Valve Assemble: Collect valves parts strictly based on picking list
  • Assemble according to flow chart and rules
  • Standardize the assembly and test to ensure valves with zero-leakage
  • Pressure Test: Valve pressure test based on 1.25 times of nominal pressure
  • 10 minutes hydraulic test with intelligent tester to ensure the sealing surface no leakage
  • A stable value of the pressure gauge is regarded as qualified product
  • Must be repaired for any leakage until reaches zero leakage standard
  • Take record of the inspection value then storage for delivery

Behind the Scenes: Advanced Casting & Machining

Quality isn't just inspected; it's manufactured. Discover how we achieve +30% stress resistance and 0ppm leakage.

Heat Treatment: ASTM A182/A479 standards with quenching & tempering for unbreakable stability.
18 CFD Simulations: Scientifically redesigned body-disc-stem fit for bidirectional sealing at 250bar.
Precision Tolerances: Strict machining standards minimize wear and maximize cycle life.
Explore Valve Body Casting Process