Rubber Lined Butterfly Valve
Ebonite Lined (3–5 mm) for Long-Term Corrosion Protection and Reliable Bubble-Tight Sealing in Water, Chemical and Desalination Systems
Full Ebonite Rubber Lining for Superior Corrosion Resistance
Bubble-Tight Shutoff Performance (ISO 5208 Rate A)
Large Diameter Range up to DN3600 (144")
Proven Solution for Seawater, Sewage & Chemical Media
Size Range
DN300 ~ DN3600
12" ~ 144"
Pressure Rating
PN6 / PN10 / PN16 / PN25 / PN40
Up to 580 psi
Lining Thickness
3 mm / 5 mm Ebonite
Design Standards
EN 593 / AWWA C504 / API 609
Face-to-Face
EN 558-1 / ISO 5752
Series 13 / 14
Operation
Gearbox / Electric / Pneumatic
Used in large-scale water treatment and desalination projects across Southeast Asia, Middle East, and coastal industrial systems
Product Overview
Overview of Rubber Lined
Butterfly Valve
Rubber lined butterfly valves are designed for corrosion-resistant shutoff in low to medium pressure systems.
With 3–5 mm internal rubber lining (ebonite, EPDM or NBR), the valve protects the body from aggressive media such as sewage, seawater, and chemicals.
The soft sealing design ensures reliable bubble-tight performance, making it a cost-effective solution for water treatment, desalination, and general industrial applications.
DN3600
Max Diameter
3–5 mm
Lining Thickness
PN40
Max Pressure
ISO 5208 Rate A
Bubble-Tight Sealing
Typical Applications
Widely used in corrosive, seawater and large diameter pipeline systems worldwide
Water Treatment Systems
Clean water, wastewater, and sludge handling. Ebonite lining resists abrasion and corrosion for long-term reliable service in municipal and industrial water systems.
Seawater & Desalination Plants
Cooling water, intake and discharge pipelines. Thick ebonite lining provides superior resistance to saltwater corrosion in coastal and offshore environments.
Chemical Processing
Mild corrosive media and liquid chemicals. Rubber lining acts as a full barrier between aggressive fluids and the valve body, extending service life significantly.
HVAC & Utility Systems
Cooling water and circulation pipelines. Low torque operation and bubble-tight sealing make it ideal for building services and district cooling networks.
Marine & Coastal Projects
Seawater transport and industrial water systems. Heavy-duty rubber lining withstands the harsh conditions of marine environments and coastal infrastructure.
Not Sure Which Spec Fits?
Tell us your working conditions and our engineers will recommend the right lining material and configuration for your project.
Talk to an EngineerKey Features & Benefits
Engineered for long-term corrosion resistance, reliable sealing, and cost-effective performance in demanding environments
Full Ebonite Lining for Maximum Corrosion Protection
Fully bonded ebonite lining (3–5 mm) forms a continuous barrier between the process media and the metal body, effectively preventing corrosion in sewage, seawater, and chemical applications.
Reliable Bubble-Tight Sealing Performance
Soft seat design ensures tight shutoff (ISO 5208 Rate A), suitable for applications where leakage control is critical.
Proven Lining Process with Strong Adhesion
Rubber lining applied on sandblasted surfaces (Sa 2.5) and vulcanized using controlled hot air or steam processes, ensuring strong adhesion and resistance to delamination.
Strict Quality Inspection for Lining Integrity
Each valve undergoes holiday (spark) test for pinholes, adhesion testing, and hardness verification (Shore D 75 ±5) to ensure lining reliability in corrosive environments.
Designed for Harsh Outdoor & Marine Conditions
External coating systems comply with C5 corrosivity category (EN ISO 12944), providing long-term protection in coastal and industrial environments.
Corrosion-Resistant Fasteners
All bolts, nuts, and fasteners are supplied in stainless steel 316L or duplex stainless steel for enhanced durability in aggressive environments.
Flexible Installation & Handling
Suitable for both horizontal and vertical installation, with lifting lugs designed for safe handling of large diameter valves.
Cost-Effective for Large Diameter Pipelines
Compared with high-performance or alloy valves, rubber lined butterfly valves provide a more economical solution for large-scale water and corrosive service systems.
Full Ebonite Lining for Maximum Corrosion Protection
Fully bonded ebonite lining (3–5 mm) forms a continuous barrier between the process media and the metal body, effectively preventing corrosion in sewage, seawater, and chemical applications.
Reliable Bubble-Tight Sealing Performance
Soft seat design ensures tight shutoff (ISO 5208 Rate A), suitable for applications where leakage control is critical.
Proven Lining Process with Strong Adhesion
Rubber lining applied on sandblasted surfaces (Sa 2.5) and vulcanized using controlled hot air or steam processes, ensuring strong adhesion and resistance to delamination.
Strict Quality Inspection for Lining Integrity
Each valve undergoes holiday (spark) test for pinholes, adhesion testing, and hardness verification (Shore D 75 ±5) to ensure lining reliability in corrosive environments.
Designed for Harsh Outdoor & Marine Conditions
External coating systems comply with C5 corrosivity category (EN ISO 12944), providing long-term protection in coastal and industrial environments.
Corrosion-Resistant Fasteners
All bolts, nuts, and fasteners are supplied in stainless steel 316L or duplex stainless steel for enhanced durability in aggressive environments.
Flexible Installation & Handling
Suitable for both horizontal and vertical installation, with lifting lugs designed for safe handling of large diameter valves.
Cost-Effective for Large Diameter Pipelines
Compared with high-performance or alloy valves, rubber lined butterfly valves provide a more economical solution for large-scale water and corrosive service systems.
Need a Custom Lining Configuration?
Whether you need special lining thickness, alternative rubber compounds, or non-standard sizes up to DN3600, our engineering team can tailor the valve to your exact working conditions.
Lining Material Selection Guide
Selecting the correct rubber lining material is critical to ensure long-term performance and corrosion resistance. The choice depends on media type, temperature, and operating conditions.
Ebonite (Hard Rubber)
Most PopularBest for: Seawater, wastewater, acidic and mildly corrosive chemicals
Recommended for desalination, seawater pipelines, and chemical service
EPDM
Water & SteamBest for: Water, hot water, steam, and neutral fluids
Recommended for water treatment and HVAC systems
NBR (Buna-N)
Oil ServiceBest for: Oil-containing media and hydrocarbons
Recommended for oil-related industrial applications
Not sure which material fits your application?
Our engineering team can recommend the most suitable lining based on your media, temperature, and operating conditions.
Technical Specifications
Standard material configuration for rubber lined butterfly valves. Custom materials available on request.
| Component | Material |
|---|---|
| Body | GJS500-7 / GJS400-15 / WCB + Rubber Lining |
| Disc | GJS500-7 / GJS400-15 / WCB + Rubber Lining |
| Shaft | SS420 / SS431 / Duplex 1.4462 |
| Disc Seal Ring | EPDM |
| Retainer Ring | Carbon Steel + Epoxy / SS304 / SS316 |
| Shaft Bearing | AL-Bronze |
| O Ring | EPDM |
| Pin | SS420 |
| Key | SS420 |
| Packing Gland | Carbon Steel + Epoxy |
| Connection Flange | Carbon Steel + Epoxy |
| End Cover | Carbon Steel + Epoxy |
Body
GJS500-7 / GJS400-15 / WCB + Rubber Lining
Disc
GJS500-7 / GJS400-15 / WCB + Rubber Lining
Shaft
SS420 / SS431 / Duplex 1.4462
Disc Seal Ring
EPDM
Retainer Ring
Carbon Steel + Epoxy / SS304 / SS316
Shaft Bearing
AL-Bronze
O Ring
EPDM
Pin
SS420
Key
SS420
Packing Gland
Carbon Steel + Epoxy
Connection Flange
Carbon Steel + Epoxy
End Cover
Carbon Steel + Epoxy
Materials shown are standard configuration. Custom material combinations (Duplex, Super Duplex, Hastelloy, etc.) available on request.
Sealing Performance & Standards
Rubber lined butterfly valves adopt a soft seat sealing design, providing reliable bubble-tight shutoff under low to medium pressure conditions. The resilient rubber lining acts as the primary sealing element, ensuring tight contact between the disc and seat, even under low differential pressure.
Leakage Performance
Complies with ISO 5208 Rate A (zero leakage)
Suitable for bi-directional sealing
Stable sealing performance in water, seawater, and non-aggressive chemical media
Sealing Characteristics
Soft sealing (resilient seat) design for tight shutoff
Effective sealing at low pressure and low torque
Suitable for frequent operation applications
Not recommended for high temperature or high pressure service
Quality Control & Testing
Each valve undergoes strict inspection throughout the lining and assembly process to ensure long-term sealing reliability and corrosion resistance.
Certifications & Compliance
Compliant with international standards and supported by complete documentation for project requirements.
ISO 9001:2015
Quality Management System
CE Certificate
European Conformity
WRAS Approved
Potable Water Compliance
Need Certificates or Test Reports for Your Project?
We provide full documentation packages including material certificates (EN 10204 3.1), pressure test reports, and third-party inspection reports upon request.
Trusted by Industrial & Water Treatment Projects Worldwide
Real feedback from engineers, procurement managers, and project teams using our rubber lined butterfly valves.
"We installed over 200 rubber lined butterfly valves in our municipal water treatment plant. After more than 18 months of operation, the sealing performance remains stable with no visible lining damage."
Project Engineer
Water Treatment Plant, Southeast Asia
"The valves are used in our seawater intake system. The ebonite lining performs well against corrosion, and we have not experienced leakage or coating failure so far."
Mechanical Supervisor
Desalination Project, Middle East
"We selected these valves for handling mildly corrosive media. The lining adhesion and overall build quality are reliable, comparable to European suppliers but with shorter delivery time."
Procurement Manager
Chemical Plant, Europe
"We have been sourcing rubber lined butterfly valves for several projects. The quality consistency and documentation support have been satisfactory, especially for large diameter valves."
EPC Contractor
International Projects
Frequently Asked Questions
Technical questions engineers and procurement teams commonly ask about rubber lined butterfly valves.
Request a Quote
Tell us your project requirements including valve size, pressure rating, lining material, and quantity. Our engineering team will respond with a detailed technical proposal within 24 hours.
Response within 24 hours
Free lining material recommendation
Custom sizes up to DN3600 available
NDA available upon request
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