Aluminum Valve Body
Casting Solutions
Precision valve bodies and valve housings in A356 aluminum. Complex flow channels, pressure-tight sealing, 100% X-ray inspection. Gravity cast for hydraulic, pneumatic, and industrial valves.
Why Choose Aluminum Gravity Casting for Valve Bodies?
Valve bodies are among the most demanding aluminum castings to manufacture. They require complex internal flow passages, pressure-tight sealing under cyclic loading, excellent surface finish on sealing interfaces, and zero tolerance for internal porosity. Gravity casting is the optimal process for meeting all these requirements simultaneously.
High-pressure die casting, while faster, introduces trapped gas and micro-porosity that compromises pressure-tightness. Sand casting lacks the dimensional accuracy for precision valve seat interfaces. Machining from billet is prohibitively expensive for complex multi-port geometries. Gravity casting strikes the ideal balance: dense microstructure, design flexibility, and cost-effectiveness.
Bohua's A356 gravity casting process, combined with sand core technology for internal channels, T6 heat treatment, 100% X-ray inspection, and precision CNC machining, delivers valve bodies that exceed the performance and reliability requirements of hydraulic, pneumatic, and industrial valve OEMs worldwide.
Competitive Advantages
6 Reasons Valve Manufacturers
Choose Bohua Casting
Complex Flow Channel Casting
Valve bodies require intricate internal flow passages with tight control over cross-sectional geometry. Our gravity casting process uses precision sand cores and permanent molds to create complex multi-port valve bodies with smooth internal surfaces. Flow simulation software optimizes channel geometry for minimal pressure drop and turbulence.
Pressure-Tight & Leak-Free Sealing
Valve bodies must seal reliably under pressure. Our A356 gravity casting produces low-porosity structures verified by 100% X-ray inspection. Helium leak testing at specified pressure levels ensures zero leakage at valve seat interfaces, port connections, and flange faces. Suitable for hydraulic and pneumatic systems up to 35 bar.
Superior Surface Quality
Valve seat surfaces and sealing faces require excellent surface finish for reliable sealing. Gravity casting produces smoother as-cast surfaces (Ra 3.2–6.3 µm) compared to die casting. CNC machining of critical sealing surfaces achieves Ra 0.8 µm or better. Final lapping and polishing available for ultra-high sealing requirements.
High-Pressure Capability
A356 T6 aluminum offers tensile strength up to 310 MPa, making it suitable for high-pressure hydraulic and pneumatic valve bodies. Our design team uses FEA stress analysis to optimize wall thickness and rib placement for maximum pressure capability at minimum weight. Burst testing available to validate design margins.
X-Ray NDT for Zero Defects
100% X-ray inspection of all valve bodies with digital archiving for full traceability. Our X-ray systems detect porosity down to 0.3 mm diameter. Any casting with internal defects in critical flow channels or pressure chambers is automatically rejected. Defect rate below 0.5% ensures consistent quality.
Integrated Machining & Testing
Full turnkey service: casting, heat treatment, CNC machining, surface treatment, pressure testing, and assembly (if required). CNC machining of valve seat interfaces, port threads, mounting holes, and actuator interfaces to tolerance ±0.03 mm. Final pressure testing and leak verification before shipment.
Industries Served
Valve Body Applications
Hydraulic Valves
- ▸Directional control valve bodies
- ▸Pressure relief valve housings
- ▸Flow control valve bodies
- ▸Proportional valve manifolds
Pneumatic Valves
- ▸Solenoid valve bodies
- ▸Air control valve housings
- ▸Pneumatic manifold blocks
- ▸Quick exhaust valve bodies
Industrial Control Valves
- ▸Ball valve bodies
- ▸Butterfly valve housings
- ▸Gate valve bodies
- ▸Check valve housings
Automotive Applications
- ▸EGR valve housings
- ▸Throttle body castings
- ▸Transmission valve bodies
- ▸Brake control valve housings
Our Process
From Design to
Pressure-Tested Valve Body
DFM Analysis & Flow Simulation
Submit valve body CAD files. Our engineering team performs DFM review with focus on flow channel geometry, wall thickness uniformity, coring feasibility, and sealing surface requirements. CFD flow simulation optimizes internal passages for minimal pressure drop.
Core & Mold Tooling
Precision sand core boxes fabricated for complex internal channels. Permanent mold designed with optimized gating and feeding system. Thermal simulation ensures directional solidification and minimal shrinkage in pressure-critical areas. First article samples in 40 days.
Gravity Casting & T6 Treatment
A356 alloy melted and degassed. Automated gravity pouring fills mold cavity at controlled rate. Sand cores create internal flow channels. After solidification and core removal, castings undergo T6 heat treatment for maximum strength and pressure resistance.
X-Ray Inspection & NDT
100% X-ray inspection with digital image archiving. Critical flow channels and pressure chambers examined for any internal porosity. Only castings that pass X-ray criteria proceed to machining. Statistical process control monitors defect trends.
Precision CNC Machining
CNC machining of valve seat interfaces, port threads (NPT, BSPP, metric), mounting holes, and actuator mounting surfaces. Boring of internal seal grooves to tolerance ±0.02 mm. Surface grinding or lapping of sealing faces to Ra 0.8 µm or better.
Leak Testing & Quality Verification
Helium leak testing at specified pressure (typically 1.5× operating pressure). CMM inspection of critical dimensions. Surface finish measurement of sealing faces. Final visual inspection. Protective coating (anodizing or powder coating) if specified. Full documentation package.
Design for Manufacturing
Valve Body Design Considerations
Follow these guidelines to optimize your valve body design for gravity casting:
Wall Thickness Uniformity
Maintain wall thickness between 3.5–10 mm where possible. Avoid abrupt thickness changes that can cause shrinkage porosity. Use gradual transitions and radiused fillets.
Draft Angles for Core Removal
Internal flow channels require 1–3° draft for sand core removal. Complex geometries may need multi-part cores or soluble cores.
Sealing Surface Location
Position critical sealing surfaces on machined faces, not as-cast surfaces. Allow 1–2 mm machining stock on sealing interfaces.
Rib & Boss Placement
Use ribs and bosses to strengthen high-stress areas without increasing overall wall thickness. Rib thickness should be 50–70% of adjacent wall.
💡Need Design Assistance?
Our DFM engineering team can review your valve body design and suggest optimizations for castability, cost reduction, and performance. Contact us to discuss your project.
Ready to Source Your Valve Bodies?
Upload your valve body CAD files or drawings. Our engineering team will provide a detailed DFM review, flow simulation analysis, and quote within 24–48 hours.