CNC Machined Valve Bodies
Valve body materials with exact grades: 6061-T6 aluminum, 304 & 316L stainless, 4140 steel, C36000 brass, Grade 5 titanium
3-axis, 4-axis and 5-axis CNC milling plus turning for flow passages, seats and flanges
±0.005 mm on critical dimensions; tight seat-bore roundness, port centerlines and sealing-face flatness
Passivation, electroless nickel, anodizing, zinc plating and pressure-tested quality control
We manufacture custom CNC machined valve bodies from customer drawings and CAD files, including ball valve bodies, gate valve bodies, globe valve bodies, check valve bodies, butterfly valve bodies, needle and metering valve bodies, solenoid valve bodies, pressure relief valve bodies, control and regulator valve bodies, manifold-mounted valve bodies, sanitary and hygienic valve bodies and custom flow-control bodies. Our CNC milling, turning, boring and deep-hole drilling capabilities produce accurate, leak-tight valve bodies for hydraulic, pneumatic, process, marine and instrumentation systems.
A valve body contains the flow path and locates every sealing and operating component, so seat-bore roundness, stem-bore alignment, port centerlines, sealing-face flatness and flow-passage geometry decide whether the valve seals, strokes and controls flow correctly. We machine valve bodies from aluminum (6061-T6, 6082-T6, 7075-T6, 5083), stainless steel (303, 304, 316L, 17-4 PH), carbon and alloy steel (1045, 4140, 4340), brass (C36000, C46400), copper (C10100, C11000) and titanium (Grade 2, Grade 5), machined from solid block and bar - not cast - so seats, passages and ports are cut to the drawing for prototypes and low-volume production. Parts are manufactured to specified dimensions, tolerances, materials and finishing requirements, with material certificates available on request.
Types of CNC Machined Valve Bodies We Manufacture
We machine a wide range of valve body types. Below are the most common; if your drawing shows a different configuration, send it for review.
Ball Valve Bodies
Bore and seat pockets for ball and seat assemblies.
Materials: 316L · C36000 · 6061-T6 · 17-4 PH
Gate Valve Bodies
Guide channels and seats for sliding gate wedges.
Materials: 4140 · 316L · C46400 · 304
Globe Valve Bodies
Seat rings and bonnet bores for linear control.
Materials: 316L · C36000 · 4140 · Grade 5 titanium
Check Valve Bodies
Guide bores and seats for poppet and ball checks.
Materials: 316L · 6061-T6 · 17-4 PH · C36000
Butterfly Valve Bodies
Bore and stem bosses for disc rotation and seals.
Materials: 316L · 4140 · 6061-T6 · C46400
Needle & Metering Valve Bodies
Precision taper seats for fine flow adjustment.
Materials: 303 · 316L · C36000 · Grade 5 titanium
Solenoid Valve Bodies
Bores and ports for spools, armatures and coils.
Materials: 6061-T6 · 303 · C36000 · 17-4 PH
Pressure Relief Valve Bodies
Seat and spring bores for set-pressure release.
Materials: 4140 · 4340 · 316L · 17-4 PH
Control & Regulator Valve Bodies
Ports and cages for proportional and process control.
Materials: 316L · 6061-T6 · 17-4 PH · C36000
Manifold-Mounted Valve Bodies
Subplate and CETOP patterns with port gaskets.
Materials: 6061-T6 · 7075-T6 · 4140 · 316L
Sanitary & Hygienic Valve Bodies
Polished bodies for food, dairy and pharma lines.
Materials: 316L · 304 · 17-4 PH
Custom Machined Valve Bodies
One-off bodies with special seats, ports and flanges.
Materials: 7075-T6 · 4340 · Grade 5 titanium · 316L
Have a Custom Valve Body? Send Your Drawing
CNC Machining Processes for Valve Bodies
3-Axis CNC Milling
Best for: Faces · flanges · ports · cavities
The primary process for rectangular and flange-type bodies.
4/5-Axis CNC Milling
Best for: Angled ports · compound seats
Machines angled flow passages and seat bores in fewer setups for accuracy.
CNC Turning & Boring
Best for: Round bodies · seat bores
Concentric bores and seals held to H7 with low run-out.
Deep-Hole & Cross-Hole Drilling
Best for: Flow passages · pilot lines
Straight intersecting passages for flow and pressure sensing.
Thread Milling & Tapping
Best for: End connections · bonnet threads
NPT, BSPP, BSPT, metric and UN threads for ports and covers.
Deburring & Flow-Passage Finishing
Best for: Internal edges · sealing seats
Burr-free passages and seats for clean flow and reliable sealing.
CNC Valve Body Materials
For valve bodies, material selection depends on media and pressure, corrosion environment, temperature, seal compatibility and weight. We machine valve bodies from the metal materials listed below - aluminum, stainless steel, carbon and alloy steel, brass, copper and titanium.
| Material | Common Grades | Typical Valve Body Applications | Key Advantages |
|---|---|---|---|
| Aluminum | 6061-T6 · 6082-T6 · 7075-T6 · 5083 | Pneumatic, solenoid and hydraulic valve bodies | Light weight with good strength; anodizable; 6061-T6 is the general-purpose standard |
| Stainless Steel | 303 · 304 · 316L · 17-4 PH | Process, marine, sanitary and instrument valve bodies | Corrosion resistance; 316L suits chloride environments; 17-4 PH adds strength |
| Carbon & Alloy Steel | 1045 · 4140 · 4340 | High-pressure hydraulic and relief valve bodies | High strength for pressure and threaded end connections |
| Brass | C36000 free-cutting brass · C46400 naval brass | Water, air and gas service valve bodies | Excellent machinability, corrosion resistance, reliable threads |
| Copper | C10100 (OFHC) · C11000 electrolytic copper | Cryogenic and high-conductivity specialty valves | High electrical and thermal conductivity |
| Titanium | Grade 2 (CP) · Grade 5 (Ti-6Al-4V) | Marine, chemical and lightweight high-pressure valve bodies | Outstanding corrosion resistance with the best strength-to-weight |
Valve Body Accuracy, Flow Ports & Sealing
Valve bodies are defined by their bores, seats and flow passages. The items below decide whether the valve seals, strokes and meets its flow rating. We machine them to drawing, and tighter on request.
| Feature | Typical Capability | Why It Matters for Valve Bodies |
|---|---|---|
| Seat Bore & Pocket | ±0.01–0.02 mm; H7 with roundness <0.01 mm | Ball, disc and poppet seats seal without leakage |
| Stem / Spool Bore Alignment | Run-out <0.01–0.02 mm across bores | Stems and spools stroke freely without binding |
| Port Centerline Position | ±0.05–0.1 mm (precision to ±0.02 mm) | End connections and manifolds line up with piping |
| Sealing-Face Flatness | 0.02–0.05 mm over the face | Gasket and O-ring faces seal on flanges and bonnets |
| Flow Passage Geometry | ±0.1–0.2 mm (precision to ±0.05 mm) | Accurate flow coefficient (Cv) and low pressure drop |
| O-Ring & Seat Grooves | Profile and depth ±0.05 mm | Repeatable seal compression on seats and covers |
| Threaded End Connections | ISO 6g / 6H or per drawing | NPT, BSPP, BSPT and UN connections seal correctly |
| Flange Face & Bolt Pattern | Flatness 0.05–0.1 mm; hole pattern ±0.05 mm | Valves bolt up square to flanges and subplates |
| Surface Roughness | Ra 0.8–3.2 μm; Ra 0.4–0.8 μm on request | Seats, sealing faces and clean-service flow paths |
| Critical Dimensions | ±0.01 mm (precision to ±0.005 mm) | Gauge-quality and alignment features |
Critical Features We Control
Seats & Seat Pockets - bored round and concentric so balls, discs and poppets seal with low operating torque.
Bore Alignment - stem and spool bores machined on one centerline so moving parts stroke freely and seal evenly.
Sealing Faces - flange, bonnet and port faces machined flat, with O-ring grooves cut to profile and depth.
Flow Passages - passages and ports drilled and deburred so flow paths are clean and match the flow rating.
Threads & End Connections - NPT, BSPP, BSPT, metric and UN threads cut to class with correct depth and lead.
Identification - part numbers or laser marking on request for traceability and assembly.
Heat Treatment & Stress Relief for CNC Valve Bodies
Loaded steel and high-strength valve bodies are heat treated as specified by the drawing. Stress relief before finish machining keeps bores and sealing faces dimensionally stable.
| Heat Treatment | Applicable Grades | Typical Valve Body Parts | Benefit |
|---|---|---|---|
| Quench & Temper | 1045 · 4140 · 4340 | High-pressure hydraulic and relief valve bodies | Higher strength for pressure and threaded connections |
| Solution + Aging | 17-4 PH · 7075-T6 | High-strength stainless and aluminum valve bodies | Strength with corrosion resistance |
| Stress Relieving | All steel grades · 6061-T6 | Complex bodies before finish boring of seats | Improves roundness and dimensional stability |
| Normalizing | Carbon steel | General-purpose steel bodies | Uniform structure and machinability |
Surface Finishes for CNC Valve Bodies
Surface finish protects valve bodies and prepares them for service - while keeping seats and sealing faces machined to standard roughness.
Chemical Conversion
Electroless Nickel Plating
Electropolishing
Powder Coat
| Surface Finish | Applicable Materials | Typical Valve Body Parts | Main Benefit |
|---|---|---|---|
| Anodizing (Type II / Hard III) | 6061-T6 · 6082-T6 · 7075-T6 · 5083 | Pneumatic, solenoid and hydraulic bodies | Wear-resistant bores; color options |
| Passivation | 303 · 304 · 316L · 17-4 PH | Process, marine and sanitary bodies | Removes free iron, improves corrosion resistance |
| Electropolishing | 304 · 316L | Sanitary and clean-service valve bodies | Smooth, clean, easy-to-sanitize surface |
| Electroless Nickel Plating | 4140 · 4340 · 1045 · Aluminum | Hydraulic and high-pressure bodies | Uniform corrosion protection on all faces |
| Zinc Plating | Carbon steel | General-purpose steel valve bodies | Economical corrosion protection |
| Black Oxide | 1045 · 4140 · 4340 | Industrial and machinery valve bodies | Economical corrosion protection; low buildup |
| Chemical Conversion (Chromate) | Aluminum grades | Paint-ready aluminum bodies | Corrosion protection; paint base |
| Powder Coat / Paint Prep | Steel · Aluminum | Industrial and outdoor valve bodies | Machined paint-ready surfaces on request |
Valve Body Quality Control
We inspect seat bores, bore alignment, sealing faces, port positions and threads throughout production to ensure valve bodies meet the drawing and seal correctly. For documented projects, we can supply material certificates and inspection records to support your incoming inspection.
Squareness Perpendicularity Inspection
CMM Height Gauge Inspection
CMM Surface Plate Inspection
Go/No-Go Thread Gauge Inspection
Pin Gauge Micrometer Inspection
| Inspection Item | Equipment / Method | Typical Valve Body Parts |
|---|---|---|
| Seat Bore & Roundness | Bore Gauge · CMM · Roundness Tester | Ball, globe, check and relief bodies |
| Bore Alignment / Run-Out | CMM · Indicator | Stem and spool bore bodies |
| Sealing-Face Flatness | CMM · Surface Plate & Indicator | Flange, bonnet and port faces |
| Port & Passage Position | CMM | End connections and flow passages |
| O-Ring Groove Profile | Profile Gauge · CMM | Seats, covers and port faces |
| Thread Inspection | Go/No-Go Thread Gauges | NPT, BSPP, BSPT and UN connections |
| Surface Roughness | Roughness Tester | Seats, sealing and flow surfaces |
| Hydrostatic / Pneumatic Test | Pressure Test (on request) | Body and seat leakage checks |
| Material Verification | Spectrometer + Material Certificate | Incoming raw material (EN 10204 3.1 available) |
| Final Inspection | CMM + Inspection Report | Final dimensional acceptance |
Need documented quality control? Send us your drawings and inspection requirements.
Prototype & Low-Volume Valve Body Machining
Valve body projects often start with prototypes - new port layouts, seat designs or replacements for obsolete bodies that must be tested before production. Machining from solid block avoids casting tooling and lead times, so prototypes and low volumes are practical. We support prototype and low-volume CNC machining from single samples to repeat small-batch orders.
Prototype Machining
For new designs, validation and fit checks.
Typical Quantity: 1–10 pcs
Low-Volume Production
For pilot systems and initial production runs.
Typical Quantity: 10–1,000+ pcs
Repeat Production
For spare plates and recurring orders with established designs.
Typical Quantity: Based on project requirements
Suitable for
Ball, gate, globe and check valve bodies
Needle, metering and solenoid valve bodies
Butterfly and pressure relief valve bodies
Control, regulator and manifold-mounted bodies
Sanitary and hygienic valve bodies
Custom and prototype flow-control bodies
Packaging & Lead Time for CNC Machined Valve Bodies
Packaging
Surface Protection: PE bags and protective film on machined and anodized faces
Corrosion Protection: VCI paper for steel valve bodies in overseas transit
Port Protection: Caps or plugs on bores and threaded ports on request
Mixed Orders: Sorted by part number with labels and quantity checklists
Custom Packaging: Customer-specific packing requirements supported
Typical Lead Time
| Order Type | Typical Lead Time |
|---|---|
| Prototype | 5–10 working days |
| Low-Volume Order | 10–20 working days |
| Production Order | 20–35 working days, by schedule |
| Repeat Order | 10–25 working days |
FAQ
Q: 1. What CNC machined valve bodies can you manufacture?
A: We manufacture custom ball valve bodies, gate valve bodies, globe valve bodies, check valve bodies, butterfly valve bodies, needle and metering valve bodies, solenoid valve bodies, pressure relief valve bodies, control and regulator valve bodies, manifold-mounted valve bodies, sanitary valve bodies and custom flow-control bodies from customer drawings.
Q: 2. What materials do you machine valve bodies from?
A: We machine valve bodies from aluminum (6061-T6, 6082-T6, 7075-T6, 5083), stainless steel (303, 304, 316L, 17-4 PH), carbon and alloy steel (1045, 4140, 4340), brass (C36000, C46400), copper (C10100, C11000) and titanium (Grade 2, Grade 5).
Q: 3. Do you machine valve bodies from solid material?
A: Yes. We machine valve bodies from solid block and bar, so seats, flow passages and ports are cut to the drawing - practical for prototypes and low volume without casting tooling.
Q: 4. What tolerances can you achieve on seats and bores?
A: We typically hold ±0.01–0.02 mm on seat bores (H7 with roundness below 0.01 mm), 0.02–0.05 mm sealing-face flatness, and ±0.01 mm (precision to ±0.005 mm) on critical dimensions.
Q: 5. Can you machine angled ports and flow passages?
A: Yes. Our 4/5-axis milling and deep-hole drilling produce angled ports, intersecting flow passages and pilot lines in fewer setups for accuracy.
Q: 6. Can you machine seat pockets and O-ring grooves?
A: Yes. We bore seat pockets round and concentric and cut O-ring grooves to profile and depth (±0.05 mm) for reliable sealing.
Q: 7. What end connections can you machine?
A: We machine NPT, BSPP, BSPT, metric and UN threads plus flange faces and bolt patterns, with ISO 6g / 6H classes or per drawing.
Q: 8. Can you machine valve bodies for high-pressure service?
A: Yes. 4140 and 4340 alloy steel bodies are heat treated for high-pressure hydraulic and relief valve service, with pressure testing available on request.
Q: 9. Can you machine sanitary or clean-service valve bodies?
A: Yes. 316L stainless steel bodies can be machined and electropolished for food, dairy, beverage and pharmaceutical lines.
Q: 10. What surface finishes do you offer for valve bodies?
A: Anodizing (Type II / Hard III), passivation, electropolishing, electroless nickel, zinc plating, black oxide and paint-ready machined surfaces.
Q: 11. Can you supply material certificates and inspection reports?
A: Yes. We can provide material certificates (EN 10204 3.1), dimensional inspection reports, CMM reports and pressure-test records on request.
Q: 12. Do you accept 2D drawings and CAD files?
A: We can work from common STEP, STP, IGES, IGS, SolidWorks, DXF and 2D drawing files.
Q: 13. What is the typical lead time for CNC machined valve bodies?
A: Typical lead times are 5–10 working days for prototypes, 10–20 working days for low-volume orders, and 15–30 working days for production orders, depending on complexity, quantity, material and finishing.
Send your 2D drawing or 3D CAD file, material grade, quantity and finishing requirements.
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