Alloy 20 Wafer Type Butterfly Valve
Alloy 20 Wafer Type Butterfly Valve Manufacturer, Supplier & Exporter
The Alloy 20 Wafer Type Butterfly Valve is a high-performance quarter-turn valve designed for demanding corrosive and chemical processing applications. Manufactured using Alloy 20 (UNS N08020), this butterfly valve offers excellent resistance to sulfuric acid, phosphoric acid, chlorides and several other aggressive chemical environments.
The wafer-type design provides a compact, lightweight and economical valve solution for installation between standard pipeline flanges. Alloy 20 butterfly valves are widely used in chemical plants, pharmaceutical industries, fertilizer plants, food processing, petrochemical facilities, power plants and industrial process systems.
We supply Alloy 20 Wafer Butterfly Valves in different sizes, pressure classes, seat configurations and operating arrangements according to project requirements.
What Is an Alloy 20 Wafer Type Butterfly Valve?
An Alloy 20 Wafer Type Butterfly Valve is a quarter-turn rotary valve consisting primarily of a body, disc, stem and seat. The disc rotates approximately 90 degrees to control or isolate fluid flow.
The valve is installed between two mating pipe flanges. Unlike a flanged butterfly valve, the wafer configuration generally uses the existing pipeline flanges to hold the valve in position, resulting in a compact installation.
Alloy 20 is selected for applications where conventional stainless steel materials may not provide adequate corrosion resistance.
Alloy 20 Wafer Butterfly Valve Features
Key Features
- Alloy 20 / UNS N08020 construction
- Wafer-type compact body design
- Quarter-turn operation
- Lightweight construction
- High corrosion resistance
- Suitable for chemical process services
- Available with lever, gearbox, pneumatic or electric actuator
- Soft or resilient seat options depending on service
- Bi-directional flow capability depending on design
- Easy installation and maintenance
- Low operating and installation space requirements
- Available in multiple sizes and pressure ratings
- Alloy 20 Wafer Type Butterfly
Alloy 20 Material Advantages
Alloy 20 is a nickel-iron-chromium alloy with additions including molybdenum and copper. Its alloy chemistry provides excellent resistance to many corrosive chemical environments.
It is particularly recognized for applications involving sulfuric acid, making Alloy 20 valves a popular choice for chemical processing and acid-handling systems.
Alloy 20 Wafer Butterfly Valve Construction
Body
The valve body can be manufactured or supplied in Alloy 20 or a suitable corrosion-resistant material according to the approved design and service requirements.
Disc
The disc is available in Alloy 20 or another compatible alloy depending on the process fluid, temperature and corrosion conditions.
Stem
The stem material is selected to provide suitable mechanical strength and corrosion resistance. Stem construction may be one-piece or two-piece depending on valve design.
Seat
Seat selection is critical for chemical service. Available configurations may include PTFE, reinforced PTFE, PFA, EPDM or other compatible materials, depending on operating conditions.
Shaft
The shaft transfers torque from the actuator or handle to the disc and is designed for reliable quarter-turn operation.
Alloy 20 Butterfly Valve Specifications
| Parameter | Typical Specification |
|---|---|
| Valve Type | Wafer Type Butterfly Valve |
| Material | Alloy 20 |
| Alloy Grade | UNS N08020 |
| Operation | Quarter Turn |
| Connection | Wafer |
| Size Range | As per requirement |
| Pressure Rating | As per design |
| Body | Alloy 20 / compatible material |
| Disc | Alloy 20 / compatible material |
| Stem | Alloy / corrosion-resistant material |
| Seat | PTFE / PFA / compatible elastomer |
| Operation | Lever / Gear / Pneumatic / Electric |
| Flow Direction | Bi-directional, subject to design |
| Application | Corrosive and chemical services |
| Testing | As per applicable valve standard/project specification |
Alloy 20 Wafer Butterfly Valve Size Range
Alloy 20 wafer butterfly valves can be supplied in a broad range of nominal pipe sizes.
Common sizes include: Alloy 20 Wafer Type Butterfly
Small Size Butterfly Valves
- 1 inch
- 1½ inch
- 2 inch
- 2½ inch
- 3 inch
- 4 inch
Medium Size Butterfly Valves
- 5 inch
- 6 inch
- 8 inch
- 10 inch
- 12 inch
- 14 inch
- 16 inch
Large Size Butterfly Valves
- 18 inch
- 20 inch
- 24 inch
- 30 inch
- 36 inch and larger, subject to engineering requirements
Final dimensions, pressure rating and face-to-face dimensions should always be confirmed against the selected valve standard and manufacturer’s approved drawing.
Alloy 20 Wafer Butterfly Valve Pressure Rating
The pressure rating depends on the valve design, body construction, seat material, temperature and applicable standard.
Common project requirements may include:
- Class 150
- Class 300
- PN10
- PN16
- PN25
- Other ratings on request
The allowable pressure-temperature rating must be verified from the manufacturer’s approved datasheet before selection.
Alloy 20 Wafer Butterfly Valve Standards
Depending on project requirements, the valve may be designed, manufactured and tested in accordance with applicable standards such as:
- API 609 – Butterfly Valves
- ASME B16.5 – Pipe Flanges and Flanged Fittings
- ASME B16.10 – Face-to-Face and End-to-End Dimensions
- ASME B16.34 – Valves
- ISO 5752 – Metal Valves – Face-to-Face Dimensions
- ISO 5211 – Actuator Mounting
- EN 593 – Industrial Valves – Metallic Butterfly Valves
The applicable standard should be confirmed according to the project specification and purchase order.
Alloy 20 Wafer Butterfly Valve Applications
Chemical Processing Industry
Alloy 20 butterfly valves are widely used for corrosive chemical handling, process lines, transfer systems and chemical storage applications.
Sulfuric Acid Service
Because of its corrosion resistance characteristics, Alloy 20 is frequently considered for sulfuric acid-related applications where material compatibility is suitable.
Fertilizer Industry
These valves can be used in selected fertilizer and chemical process applications involving corrosive fluids.
Pharmaceutical Industry
Alloy 20 valves may be used in specialized pharmaceutical process systems where corrosion resistance and material compatibility are important.
Petrochemical Industry
The valves can be incorporated into process piping systems where aggressive or corrosive fluids are present.
Power Plants
Selected chemical dosing, water treatment and auxiliary process systems can use corrosion-resistant butterfly valves.
Alloy 20 Butterfly Valve Operating Options
Lever Operated
A manual lever is suitable for smaller valves and applications requiring simple local isolation.
Gear Operated
A gearbox provides increased mechanical advantage and is commonly used for larger valve sizes.
Pneumatic Actuated
Pneumatic actuators provide fast and reliable automatic operation where compressed air is available.
Electric Actuated
Electric actuators are suitable for automated process systems where electrical control and remote operation are required.
Advantages of Alloy 20 Wafer Butterfly Valves
Corrosion Resistance
The principal advantage of Alloy 20 is its resistance to various corrosive environments.
Compact Design
The wafer construction requires relatively little installation space compared with many conventional valve designs.
Lightweight Construction
Butterfly valves generally require less material and space than many larger isolation valve designs.
Easy Operation
Quarter-turn operation allows the valve to move rapidly between open and closed positions.
Cost-Effective Installation
The compact design can reduce valve weight, supporting structure requirements and installation effort.
How to Select an Alloy 20 Wafer Butterfly Valve
Before selecting a valve, the following information should be considered:
- Nominal valve size
- Pressure class
- Operating temperature
- Process fluid
- Chemical concentration
- Flow velocity
- Required seat material
- Body and disc material
- Manual or automatic operation
- Pipeline flange standard
- Face-to-face requirement
- Testing and inspection requirements
Correct material selection should be based on the actual process conditions rather than alloy name alone.
Alloy 20 Wafer Butterfly Valve Testing
Depending on the project specification, valves may undergo:
- Hydrostatic body testing
- Seat leakage testing
- Functional testing
- Dimensional inspection
- Visual inspection
- Material verification
- PMI, where specified
- Actuator functional testing
- Pressure testing according to the applicable standard
Inspection and test documentation can be supplied according to project requirements.
Alloy 20 Valve Documentation
Depending on the purchase requirement, documentation may include:
- Manufacturer’s datasheet
- General arrangement drawing
- Dimensional drawing
- Material Test Certificate
- Pressure Test Certificate
- Inspection & Test Plan
- Certificate of Conformance
- PMI report, where applicable
- Calibration certificates for relevant instruments
- Operation and maintenance manual
- Actuator datasheet
- Valve test report
Alloy 20 Wafer Butterfly Valve Maintenance
Regular inspection helps maintain reliable valve performance.
Recommended maintenance activities include:
- Inspecting the valve externally
- Checking flange and bolting condition
- Inspecting actuator operation
- Checking for leakage
- Verifying stem and actuator operation
- Inspecting seat condition during overhaul
- Confirming correct valve alignment
- Following the manufacturer’s maintenance instructions
The maintenance interval should be determined by service conditions and the manufacturer’s recommendations.
Alloy 20 Wafer Butterfly Valve vs Conventional Butterfly Valve
Alloy 20 butterfly valves are particularly useful when the process requires enhanced corrosion resistance.
Compared with conventional carbon steel or standard stainless-steel butterfly valves, Alloy 20 construction can provide a more suitable material option for certain aggressive chemical services.
However, material compatibility must always be checked against the exact chemical composition, concentration, temperature and operating conditions.
Why Choose Us for Alloy 20 Wafer Butterfly Valves?
We provide industrial valve solutions for customers requiring corrosion-resistant valves for chemical and process applications.
Our supply support can include:
- Alloy 20 wafer butterfly valves
- Customized valve configurations
- Manual and actuated valves
- Technical datasheets
- GA drawings
- Material documentation
- Pressure test documentation
- Project-specific inspection documentation
- Domestic and export supply
We can support customers with valve selection based on size, pressure rating, material, process fluid and operating conditions.
Alloy 20 Wafer Butterfly Valve Supplier in India
Looking for an Alloy 20 Wafer Butterfly Valve Supplier in India? We supply industrial butterfly valves for chemical processing, fertilizer, pharmaceutical, petrochemical, water treatment and other process industries.
For project enquiries, provide the valve size, pressure class, body material, disc material, seat material, operating temperature, process fluid and actuator requirement so the correct configuration can be selected.
Alloy 20 Wafer Butterfly Valve Exporter
Our Alloy 20 butterfly valves can be supplied for domestic and international industrial projects. Export documentation, packing requirements, inspection documentation and project-specific technical documents can be arranged according to the purchase specification.
Frequently Asked Questions
What is an Alloy 20 Wafer Butterfly Valve?
It is a quarter-turn butterfly valve using Alloy 20 or Alloy 20-compatible wetted components and a wafer-style connection for installation between pipeline flanges.
What is Alloy 20?
Alloy 20, also known as UNS N08020, is a corrosion-resistant nickel-iron-chromium alloy developed for demanding chemical environments.
Is Alloy 20 suitable for sulfuric acid?
Alloy 20 is commonly considered for sulfuric acid applications, but suitability depends on concentration, temperature, impurities and other process conditions.
What is the difference between wafer and lug butterfly valves?
A wafer butterfly valve is generally sandwiched between two pipeline flanges, while a lug-style valve has threaded or tapped lugs that allow bolting through the valve body.
Can the valve be automated?
Yes. Alloy 20 butterfly valves can be supplied with pneumatic or electric actuators when the valve design supports the required actuator mounting arrangement.
What seat material should be selected?
Seat material depends on the fluid, concentration, temperature and pressure. PTFE, PFA and compatible elastomers may be considered depending on service conditions.
What information is required for a quotation?
Normally, the required information includes size, pressure class, connection, body material, disc material, seat material, operating temperature, process medium and operation type.
Conclusion
The Alloy 20 Wafer Type Butterfly Valve provides a compact and versatile solution for industrial applications where corrosion resistance is an important design requirement. With its quarter-turn operation, wafer connection and Alloy 20 material option, it can be used across a wide range of chemical and process applications.
For technical selection, always verify the valve’s pressure-temperature rating, chemical compatibility, dimensions, seat construction and applicable standards against the project requirements.
