Aluminum Backed Seat for High-Performance Resilient Seated Butterfly Valves
Features and Benfits
• The Aluminum backup ring is with high strength and a certain flexibility can avoid crack during assembly.
• Only brand high-level rubbers are used.
• Rubber mixed with automatic mixing machines, avoid the influence of operator.
• All normal physical properties of rubber are tested in house before vulcanization
• Rubber mixing process is ISO/TS 16949 certified
• Vulcanization process is ISO 9001 certified
Technical Details
Size Range
DN50 to DN1200
Backup ring Materials
Aluminum (DN50 to DN1200)
Rbuuer
EPDM / Buna-N / VITON / HNBR / CSM / NR / SILICON / CR / IIR / PU / SBR / PTFE
Maximum Allowable Operating Pressure
16 bar
Application Temperature Range
Based on seat material
Special Options
• WRAS
• NSF-61
• E-KTW
• FDA
Applications
• General Industrial
• HVAC
• Water
• Wastewater
• Chemical/Petrochemical Processing
• Acids
• Gas
• Vacuum
• Food and Beverage
• Power and Utilities
• Pulp and Paper
• Marine and Commercial Shipbuilding
Temperature Range
| Seat Material | Advantages / Limitations | Continuous Service Temperature Range (>1000 hrs) | Intermittent Service Temperature Range (4 hrs) |
| EPDM | EPDM is a synthetic rubber suitable for many general purpose applications with higher temperature requirements.It is acceptable for hot and chilled water, glycols, detergents, phosphateesters, Ketones and alcohols. EPDM is not suitable for any hydrocarbon-based oils and lubricants, or in compressed air systems with hydrocarbons. | -46℃ to 135℃(-50℉ to 275℉) | -51℃ to 149℃ (-60℉ to 300℉ ) |
| Buna-N/NBR | Also known as Nitrile or NBR. Buna-Nisagood, general purpose material for most general services such as water at ambient temperatures, vacuum, compressedair, saltsolutions, alkaline solutions and aliphatic h hydrocarbons(saturated and unsaturated). Buna-N is not recommended for strong oxidizing agents, nitrated hydrocarbons, Ketones, acetates, phenols, aldehydes or for gasolines with additives. Also, Buna-N can swell in hot water applications, and increase operating torque. | -12℃ to 82℃(+10℉ to 220℉) | -12℃ to 93℃ (+10℉ to 280℉ ) |
| VITON | Viton® is a fluoroelastomer with exceptional resistance to oils and chemicals at higher temperatures.Viton® is suitable for hydrocarbons, and has agreater chemical resistance than Buna-N. Viton® can also be recommended for mineralacids,dilute and concentrated solutions and alcohols.Viton® is not recommended for higher temperature water and steam applications as it has a tendency to swell. Also, Viton® hardens at the lower end of the temperature range, which can increase operation torque. | -12℃ to 177℃(+10℉ to 350℉) | -12℃ to 205℃ (+10℉ to 400℉ ) |
| H-NBR | HNBR rubber compounds perform well in petroleum based oils and fuels, aliphatic hydrocarbons, vegetable oils, silicone oils and greases, ethylene glycol, water and steam to 150°C ( 300°F), and dilute acids, bases and salt solutions to moderate temperatures. HNBR rubber compounds are susceptive to exposure to chlorinated hydrocarbons, esters, ethers, ketones, and strong acids. | -29℃ to 143℃(-20℉ to 290℉) | -29℃ to 180℃(-20℉ to 356℉) |
| CSM | CSM has several key properties that make it suitable for hazardous environments. These include a high level of ozone, UV, weathering and chemical resistance, alongside improved heat ageing and low gas permeability. Similar to Chloroprene, CSM rubber also has poor low-temperature flexibility and high levels of chemical resistance. However, CSM rubber has poor fuel resistance, which does not suit automotive applications. Additionally, dynamic sealing applications are not recommended for CSM due to the poor nature of its compression set. | -20℃ to 125℃(-4℉ to 257℉) | -20℃ to 150℃(-4℉ to 302℉) |
| NR | Natural rubber performs well in alcohols and organic acids. Natural rubber suffers from poor resistance to hydrocarbon oil. It is not suitable in UV, oxygen, and ozone because of the double bond in the polymer backbone. However, its poor weathering resistance can be improved with special additives. NR is often vulcanized to improve resistance and elasticity, and to prevent it from perishing. | -50℃ to 70℃(-58℉ to 158℉) | -50℃ to 80℃(-58℉ to 176℉) |
| SILICON | Silicone rubber offers excellent heat resistance, flexibility, durability, and chemical stability, making it ideal for extreme conditions. Silicone is suitable for contact with water, steam, most chemicals, and can withstand both high and low temperatures, excluding hydrocarbon oils. Silicone rubber is not suitable for strong bases, hydrofluoric acid, high-temperature oils, or aromatic hydrocarbons. | -60°C to 230°C(-76°F to 446°F) | -60°C to 300°C(-76°F to 572 °F) |
| CR | Chloroprene (CR) rubber, or Neoprene, offers good resistance to oils, weathering, and ozone, with versatile mechanical properties. It excels in water-based applications and moderate chemical exposure, providing resilience across a broad temperature range. Chloroprene (CR) rubber is unsuitable for aromatics, ketones, esters, and strong polar solvents, as it may swell or degrade. | -7℃ to 93℃(+20℉ to 200℉) | -7℃ to 107℃(+20℉ to 225℉) |
| IIR | Butyl rubber offers superior gas impermeability, great heat resistance, and durability, perfect for airtight seals and membranes. Butyl rubber is suitable for contact with air, water, oils, and various chemicals, making it versatile in sealing applications across industries. Butyl rubber is not recommended for use with strong oxidizers, aromatic hydrocarbons, or halogenated solvents, as it may degrade or swell. | -40℃ to 130℃(-40℉ to 266℉) | -40℃ to 150℃(-40℉ to 302℉) |
| PU | Polyurethane rubber offers exceptional tear strength, high resilience, and outstanding resistance to oils, fuels, and abrasion. It excels in dynamic applications, hydraulic systems, and where exposure to harsh chemicals occurs, making it ideal for seals, wheels, and industrial parts. Polyurethane rubber is not suitable for prolonged exposure to esters, ketones, and certain solvents, as they can cause degradation. | -40℃ to 80℃(-40℉ to 176℉) | -40℃ to 100℃(-40℉ to 212℉) |
| SBR | SBR boasts economical pricing, strong mechanical performance, superior abrasion resistance, and versatility with fluids like water and weak acids. Ideal for applications demanding durability and economy, it excels in sealing, hoses, and gaskets for non-corrosive liquid handling. SBR is not suitable for use with oils, fuels, and strong oxidizing agents due to its limited chemical resistance. | -51℃ to 80℃(-60℉ to 176℉) | -51℃ to 100℃(-60℉ to 212℉) |