Ball Valve Manufacturing Process
From blank manufacturing to final inspection - over 30 years of precision engineering in every step
Mfg
Machining
Machining
Treatment
Treatment
Inspection
Blank Manufacturing
Premium stainless steel, duplex steel, and Hastelloy raw materials are processed into valve ball blanks using hot die forging and precision casting. Metal flow lines are optimized to lay a solid foundation for downstream processes.
CNC temperature-controlled heating for precise forging parameters
Multi-directional die forging for continuous grain flow
Optimized blank dimensions with appropriate machining allowance
Post-forging normalizing treatment to relieve internal stress
Rough Machining
High-efficiency rough machining is performed on CNC lathes to rapidly remove excess material, forming the basic geometry including the spherical surface, bore, and slot features - preparing the workpiece for finish machining.
CNC lathes for high-speed material removal
Initial forming of spherical surface, bore, and slot geometry
Rough machining tolerance controlled within IT10
Adequate coolant flow to prevent thermal deformation
Finish Machining
MAZAK 5-axis machining centers and high-precision CNC spherical grinding machines complete multi-surface machining in a single setup. Roundness, surface finish, and dimensional accuracy all meet international standards.
MAZAK 5-axis simultaneous machining - multi-face in one setup
Spherical roundness controlled within 0.005 mm
Precision boring ensures bore concentricity
In-line measurement system for real-time accuracy monitoring
Heat Treatment
Precision-controlled quenching and tempering processes optimize the microstructure of the valve ball, significantly improving hardness, wear resistance, and overall mechanical properties for demanding service conditions.
Vacuum heat treatment furnace with ±5°C temperature control
Quenching + tempering for optimized microstructure
Hardness uniformity within ±2 HRC
Full thermal profile recording for complete traceability
Grinding
A multi-stage grinding process - rough → semi-finish → finish - achieves a mirror-grade surface finish on the ball surface, ensuring exceptional sealing performance even under high-pressure conditions.
Multi-stage grinding: rough → semi-finish → finish
Surface roughness down to Ra 0.2 μm
Specialized lapping compounds for uniform surface finish
Ultrasonic cleaning line ensures contaminant-free surfaces
Surface Treatment
Multiple surface enhancement options are offered based on application requirements, including electroless nickel plating (ENP), nitriding, and HVOF tungsten carbide coating - dramatically improving corrosion and wear resistance.
Electroless Nickel Plating (ENP) - superior corrosion resistance
Nitriding - surface hardness up to HV 1000+
HVOF tungsten carbide spray - ideal for extreme service conditions
Uniform coating thickness with excellent adhesion - no delamination risk
Quality Inspection
Every valve ball undergoes a comprehensive quality inspection process, including CMM dimensional verification, roundness measurement, hardness testing, surface quality assessment, and pressure seal testing - ensuring 100% conformance.
CMM (Coordinate Measuring Machine) full-dimensional inspection
Roundness tester for precise profile measurement
Hardness tester for material uniformity verification
100% visual inspection + pressure seal testing
Precision Inspection
CMM, roundness testers, spectrometers and advanced inspection equipment ensure quality at every stage
Advanced Equipment
MAZAK 5-axis machining centers, CNC spherical grinders, and best-in-class machinery for superior accuracy
Full Traceability
Every product has a dedicated process file - fully traceable from raw material to finished product
Explore Our Manufacturing Capabilities
Over 30 years of valve ball expertise, 4,000 m² modern facility - let's work together