Valve castings manufacturer offering custom cast valve bodies in WCB stainless duplex alloys with API ASME certified OEM production.
Valve Castings – Product Overview
What are valve castings?
When I talk about valve castings, I mean the cast valve body, bonnet, cover, and major pressure-containing parts that form the core of an industrial valve. We pour molten metal into engineered molds to create the valve body casting with all the critical flow paths, wall thicknesses, and mounting interfaces already built in. These castings are then machined, assembled, and tested to become gate, globe, check, ball, butterfly, and plug valves for demanding services.
Types of valve castings supplied
I supply a full range of custom valve castings para:
- Gate valve castings – bodies, bonnets, wedges, yokes
- Globe valve castings – bodies, bonnets, cages
- Check valve castings – swing, dual-plate, piston bodies and covers
- Ball valve body castings – one-piece, two-piece, and three-piece bodies, closures
- Butterfly valve castings – bodies, discs, seat retainers
- Plug valve castings – bodies, covers, plugs, liners interface parts
All are engineered to fit your own designs or OEM/ODM specifications.
Pressure classes and size range
I design and produce high‑pressure valve castings para:
- ASME / API classes: Class 150 – 2500
- EN / ISO ratings: PN10 – PN420
Typical size capability:
- NPS: 1/2″ – 72″
- DN: DN15 – DN1800
Larger diameters or special geometries can be reviewed case-by-case.
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- cURL Too many subrequests. – Good for mildly corrosive media, general chemical and water service.
- CF8M (316) / CF3M (316L) – Higher pitting and crevice corrosion resistance, widely used for seawater, chlorides, and aggressive chemicals.
Estas stainless steel castings are also well suited for hygienic, food, and pharmaceutical lines. For more on how stainless behaves in casting, I’ve broken it down in our dedicated guide to the stainless steel casting process.
Duplex and super duplex valve body castings
For tough chloride environments, I recommend duplex stainless valve body castings:
- 4A / CD3MN (2205) – High strength + excellent resistance to stress corrosion cracking, ideal for offshore, desalination, and brine service.
- 5A / 6A / CE3MN – Super duplex for extreme chloride and sour service, subsea valves, and highly loaded high-pressure valve castings.
These grades are the go-to for duplex stainless steel valve bodies in seawater and critical oil & gas pipelines.
Nickel alloy and high-alloy valve castings
For the harshest media, nickel alloy valve castings are the safe choice:
- Inconel, Monel, Hastelloy, Alloy 20 – Used for strong acids, sour gas, high temperature, and highly corrosive or oxidative environments.
These are typical for cryogenic valve castings, severe chemical plants, and specialty valves where failure is not an option.
Bronze and aluminum bronze valve castings
For seawater and marine valves, bronze valve body castings still win:
- C95800, C95400, C83600 – Excellent resistance to seawater, cavitation, and biofouling; widely used in marine valves, desalination, and offshore firewater systems.
Aluminum bronze valve castings combine good strength with strong corrosion resistance in saltwater.
Ductile iron and gray iron valve castings
Where cost and vibration damping matter:
- Ductile iron (ASTM A536, EN-GJS-400-15) – Higher strength and toughness than gray iron; common for waterworks, fire systems, and general industrial valves.
- Ferro cinzento – Good machinability and damping, used for low-pressure water and HVAC systems, typically in lower pressure classes.
How we select the right valve casting material
When I quote or engineer custom valve castings, I always base material selection on:
- Media – Corrosive / non-corrosive, chlorides, H₂S, CO₂, seawater, sour gas, slurry.
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- Alloy liners for high-pressure valve castings and subsea valves
- Large-diameter corrosion-resistant rings in duplex, super duplex, or nickel alloys
Vantagens:
- Dense, fine-grain structure
- Excellent mechanical properties and leak-tightness
- Ideal para high-pressure valve castings and severe service
How I choose the right valve casting process
I generally select the process around four things: size, geometry, tolerance, and budget.
- Fundição por areia
- Best for: Large cast valve body, gate valve casting, globe and check bodies
- Strengths: Low tooling cost, wide size range, robust materials
- Limits: Rougher surface, thicker minimum wall, wider tolerance
- Fundição por investimento
- Best for: Precision investment cast valve components, small ball and butterfly bodies
- Strengths: Narrow tolerance, thin walls, good surface finish
- Limits: Higher part cost, size limits
- Centrifugal casting
- Best for: Sleeves
Standards and Certifications for Valve Castings
When you buy valve castings from us, you’re not just buying metal – you’re buying compliance, documentation, and risk control. We design and produce cast valve bodies and bonnets to meet the main international valve and pressure equipment standards your projects require.
API & ASME Valve Casting Standards
We supply valve body castings and bonnets in full accordance with the key American standards, including:
- cURL Too many subrequests. – Gate valve body castings for refinery and high‑pressure pipeline service
- API 6D – Pipeline valve castings (ball, gate, plug, check) for transmission lines
- API 594 – Wafer, lug and double‑door check valve castings
- ASME B16.34 – Pressure–temperature ratings, wall thickness and design rules for industrial valve castings
These standards drive our design checks, casting wall thickness, NDT level, and pressure test requirements, which is critical for oil & gas and other high‑risk services. For example, our cURL Too many subrequests. are frequently specified in global oil and gas projects.
European & International Standards
For EU and global projects, we produce valve castings to:
- EN 1984 – Steel gate, globe and check valve castings for industrial service
- ISO 15761 – Compact steel valves for flanged, threaded and welded ends
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cURL Too many subrequests. procedimentos de testes e controlo de qualidade.
Chemical Analysis & Mechanical Testing
We control chemistry and properties tightly to match API, ASME, and EN requirements:
- Spectrochemical analysis on each heat for C, Cr, Ni, Mo, etc.
- Testes mecânicos: tensile, yield, elongation, hardness
- Batch-wise certification to customer spec and material standard
NDT for Valve Castings (RT, UT, MT, PT)
Critical valve body castings, bonnets, and high‑pressure parts go through a tailored NDT plan:
- RT (Radiographic Testing) for internal shrinkage, porosity, hot tears
- UT (Ultrasonic Testing) on thick sections, large gate valve castings, high‑pressure API 6D bodies
- MT (Magnetic Particle Testing) on carbon steel and low alloy WCB valve castings at critical areas
- PT (Dye Penetrant Testing) on stainless steel valve castings and duplex stainless steel valve bodies
- All procedures are written and supervised by Level III NDT personnel
Dimensional Inspection on Valve Body Castings
To keep interchangeability and machining stock under control, we use:
- Máquina de Medir Coordenadas (MMC) for complex ball valve body casting geometries
- Dedicated gauges and templates for flange faces, end-to-end, and face-to-face dimensions
- Control of draft, machining allowance, and wall thickness per drawing and ASME B16.34 envelope
Pressure Testing: Hydrostatic & Pneumatic
Before shipment (or before final machining if specified), we validate pressure integrity:
- Hydrostatic pressure testing of valve castings to specified test pressure and hold time
- Pneumatic leak testing with air or nitrogen for tightness on critical joints and sealing areas
- Test records stored and linked to heat and casting number
Cryogenic Valve Casting Testing (-196°C)
For LNG and cryogenic valve castings, we qualify materials and castings for low temperature:
- Impact testing (Charpy) at -46°C, -101°C, down to -196°C depending on spec
- Fracture appearance and energy results documented in the MTC
- Controls for weldability and toughness for cryogenic service
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- Gate valve castings e cURL Too many subrequests.
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- cURL Too many subrequests.: down to ±0,02–0,05 mm on critical features (seat rings, stem bores, flange faces)
- Surface roughness:
- Sealing faces: Ra 0.8–1.6 µm
- General machined surfaces: Ra 3.2–6.3 µm
We can match ASME, API, and OEM drawing requirements for precision valve casting e CNC machined valve castings.
Coating and Lining Options
To extend service life in aggressive media, we offer:
- Epoxy coatings (internal/external) for water, wastewater, and general industrial
- PTFE / PFA linings for highly corrosive chemicals
- Electroless nickel plating (ENP) for wear and corrosion on critical bores and sealing areas
- Rubber lining (NBR, EPDM, etc.) for slurry, seawater, and erosion zones
For non-ferrous parts, we also support bronze machining, similar to our bronze precision components produced for decorative and industrial use, such as bronze rod machining services.
Corrosion Protection and Packing
Every finished valve body casting is protected for shipment:
- Anti-corrosion oil on machined surfaces
- Plastic caps or covers on flange faces and threaded ports
- VCI plastic bags, moisture barriers, and strong export-ready wooden cases
- Clear part marking and heat number identification for traceability
Supply Options to Fit Your Process
We’re flexible in how we supply industrial valve castings:
- Raw valve castings – as-cast, shot-blasted, ready for your own machining
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Fornecemos high‑pressure valve castings para:
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- Combined-cycle plants
- Nuclear auxiliary systems (non‑safety critical as per client spec)
Challenges:
- High steam pressure and temperature
- Thermal cycling and fatigue
- Strict dimensional control and traceability
We focus on clean, defect-free sand cast valve bodies with controlled ferrite/pearlite structure and full NDT.
Water Treatment and Desalination Valve Castings
For waterworks and desalination plants:
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- Butterfly, gate, and check valve bodies up to large diameters
Conditions:
- Brackish and seawater corrosion
- Large-bore valves with robust wall thickness
- Cavitation and erosion at throttling points
We often combine seawater‑resistant aluminum bronze with specialized tratamentos de superfície to boost lifespan in chloride-rich environments.
Cryogenic and LNG Valve Castings
Produzimos cryogenic valve castings para:
- LNG liquefaction and receiving terminals
- Low-temperature storage and transfer
- Air separation units
Key requirements:
- Toughness down to -196°C
- Low-temperature impact tested materials
- Tight tolerances for reliable sealing at cryogenic contraction
Typical options include LCB/LCC carbon steels e austenitic stainless steel valve castings with strict heat treatment and testing.
General Industrial and Marine Valve Castings
For general industry and marine, we support:
- Pulp & paper, food, pharmaceuticals (clean and corrosion‑resistant cURL Too many subrequests.)
- Mining, steel mills, and OEM machinery (rugged cURL Too many subrequests. cURL Too many subrequests.
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- Materiais cURL Too many subrequests. aço carbono, aço inoxidável, cURL Too many subrequests., nickel alloys, cURL Too many subrequests. bronze valve body castings.
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| Casting processes | Sand, investment, centrifugal (if needed) |
| Usinagem | In-house CNC (4–5 axis) |
| Ensaios Não Destrutivos (END) | RT, UT, MT, PT with qualified Level II / III |
Benefits of a Specialized Valve Casting Foundry
A general foundry can pour metal, but a precision valve casting foundry understands:
- Flow paths, wall thickness control, and stress areas in cURL Too many subrequests., cURL Too many subrequests., check and globe valve bodies.
- Casting design for high-pressure valve castings (Class 600–2500 / PN100+).
- Special services like cryogenic valve castings, subsea valve castings, e marine valve castings.
- Tight machining allowances to cut your downstream machining cost.
Você recebe:
- More stable quality, fewer repairs.
- Faster development for custom valve castings and OEM / ODM work.
- Better support on standards and documentation for EPC and end-users.
If you also work with high-alloy components, it helps when your valve casting partner has experience machining difficult materials similar to high-temperature nickel alloy parts, like our own nickel alloy precision machining services. It proves they know how to handle hard, heat-resistant metals correctly.
Production Capacity and Plant Scale
Always match supplier capacity with your project load.
What to ask:
- Monthly casting tonnage (e.g. 300–1,000+ tons/month).
- Workshop size (m²) and number of molding lines.
- Maximum valve size (e.g. 72″ ball valve body casting).
- Maximum single casting weight (kg/ton).
- Separate lines for:
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- Tratamento térmico
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- Usinagem CNC
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- cURL Too many subrequests. third-party inspection (DNV, ABS, BV, Lloyd’s, TÜV).
Ask for a project list e photos of shipped valve castings to see real cases, not just a catalog.
Evaluating Quality System and Certifications
A serious industrial valve castings supplier will have strong quality control on paper and in practice.
Core quality items to verify:
- Sistema de qualidade
- ISO 9001 as a minimum.
- Clear procedures for:
- Material control
- Casting & heat treatment
- Ensaios Não Destrutivos (END)
- Non-conformity handling
- Product-related approvals
- Compliance with cURL Too many subrequests., API 6D, ASME B16.34, EN / ISO valve standards.
- PED (for EU), possibly AD2000-W0 if you serve Germany.
- NDT competency
- Level II / Level III for RT, UT, MT, PT.
- Documentation
- Ability to issue EN 10204 3.1 / 3.2 MTCs.
- Traceable heat numbers, casting ID, and machining records.
Simple evaluation table
| Área | What to confirm |
|---|---|
| ISO & PED | Valid certificates and scope include valve castings |
| Standards | API / ASME / EN capabilities listed in procedures |
| Ensaios Não Destrutivos (END) | In-house or certified third-party, Level II/III |
| Traceability | Full link: heat → casting → test → shipment |
| Audits | Openness to customer or 3rd-party audits |
If a supplier passes these checks and responds quickly with technical detail (not just sales talk), you’re likely dealing with a reliable valve casting manufacturer cURL Too many subrequests.
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- Casting allowance (typical):
- +2.5–3.0 mm for sand cast valve bodies
- +1.5–2.0 mm for investment cast valve components
- Extra margin is smart for:
- Corrosion/erosion service
- Hard-facing, cladding, or lining
- Post-cast machining stock
Typical Valve Casting Drawings
Your valve casting drawing should be clean and focused on what actually matters at the foundry:
Key items to show:
- Casting outline with parting line and draft direction
- All pressure-retaining areas clearly marked
- Nominal and minimum wall thickness
- Machining allowances and critical machined faces
- NDT zones (RT / UT / MT / PT) and acceptance level
- Material grade, standard (API 600 / API 6D / ASME B16.34), and pressure class
- MTR / EN 10204 certification requirements (3.1 / 3.2)
Design Tips for Custom Valve Castings (OEM / ODM)
When you order custom valve castings from us, these steps help avoid delays and defects:
- Avoid sharp corners
- Use generous radii and smooth transitions.
- Helps feeding, reduces hot spots and shrinkage.
- Keep wall thickness consistent
- Minimize sudden jumps in section thickness.
- Use ribs instead of massive sections for strength.
- Think about molding and machining
- Add draft (2–3°) where possible.
- Leave enough machining stock on critical faces and bores.
- Define critical features up front
- Sealing surfaces, bore alignments, face-to-face dimensions.
- Tolerances on these should match your final valve standard.
- Share your 3D model and load case
- STEP / Parasolid + design pressure, temperature, medium.
- We can review castability and recommend improvements.
If you send us: 3D model, 2D drawing, operating conditions, material, and required standards, we can quickly quote and engineer a cast valve body that meets your spec without over-building cost into the part.
Valve Casting Case Studies
Real projects with custom valve castings
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| Estágio | Typical lead time* |
|---|---|
| Prototype (new tooling) | 4–6 weeks (incl. pattern/tooling) |
| Prototype (existing tools) | cURL Too many subrequests. |
| Mass production | 4–8 weeks after PO & drawing approval |
*Exact timing depends on material, NDT level, and machining scope.
Raw vs Fully Machined Valve Castings
I supply three main levels, depending on how much work you want to keep in-house:
| Option | What you get | When to choose it |
|---|---|---|
| Raw castings | As-cast, shot-blasted, with risers removed | You have your own machining capacity |
| Semi-machined | Key faces, flanges, and bores machined | You finish only critical fits |
| Fully machined | CNC machined, drilled, tapped, pressure-tested | You want near “ready-to-assemble” parts |
I can also match machining with existing low-carbon steel machining services for full package supply.
RFQ Information Needed for Valve Castings
For a fast and accurate quote, I need at least:
- Valve type: gate, globe, check, ball, butterfly, plug
- Casting status: raw / semi-machined / fully machined
- Classe de material: e.g. WCB, CF8M, duplex, bronze, ductile iron
- Design standard: API 600, API 6D, API 594, ASME B16.34, EN, ISO, etc.
- Pressure class: Class