Phenolic Backed Seat for High-Performance Resilient Seated Butterfly Valves
Features and Benfits
• Mainly composed of phenolic aldehyde resin and cotton clothes strips, enhances the strength of the backup ring, and the flexibility of material can also avoid the 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
Phenolic (DN40 to DN 350)
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 | As a synthetic rubber, EPDM is ideal for general-purpose uses that involve high-temperature conditions. It works well with hot and cold water, glycols, detergents, phosphate esters, ketones, and alcohols. It is not suitable for use with hydrocarbon oils and lubricants, or in systems where hydrocarbons are present in compressed air. | -46℃ to 135℃(-50℉ to 275℉) | -51℃ to 149℃ (-60℉ to 300℉ ) |
| Buna-N/NBR | Known as Nitrile (NBR) or Buna-N, this material is ideal for many general services, such as use with water at ambient temperatures, vacuum environments, compressed air, salt solutions, alkaline solutions, and aliphatic hydrocarbons (both saturated and unsaturated). It should not be used with strong oxidizing agents, nitrated hydrocarbons, ketones, acetates, phenols, aldehydes, or gasoline with additives. Additionally, Buna-N can swell in hot water applications, which may increase operating torque. | -12℃ to 82℃(+10℉ to 220℉) | -12℃ to 93℃ (+10℉ to 280℉ ) |
| VITON | As a fluoroelastomer, Viton® is highly resistant to oils and chemicals at elevated temperatures. It works well with hydrocarbons and exhibits superior chemical resistance compared to Buna-N. It is also suitable for mineral acids, alcohols, and dilute or concentrated solutions. However, Viton® should not be used in high-temperature water or steam applications, as it tends to swell. Furthermore, at lower temperatures, Viton® can harden, leading to increased operational torque. | -12℃ to 177℃(+10℉ to 350℉) | -12℃ to 205℃ (+10℉ to 400℉ ) |
| H-NBR | HNBR rubber is highly resistant to petroleum oils and fuels, aliphatic hydrocarbons, vegetable oils, silicone oils, ethylene glycol, water, and steam up to 150°C (300°F). It also resists dilute acids, bases, and salt solutions at moderate temperatures. However, it is not suitable for exposure to chlorinated hydrocarbons, esters, ethers, ketones, or strong acids. | -29℃ to 143℃(-20℉ to 290℉) | -29℃ to 180℃(-20℉ to 356℉) |
| CSM | CSM offers strong resistance to ozone, UV, weathering, and various chemicals, combined with improved heat aging and low gas permeability. Like Chloroprene, it has limited flexibility at low temperatures and provides excellent chemical resistance. However, CSM is not suitable for use in automotive applications due to its poor fuel resistance, and it is not ideal for dynamic sealing due to its poor compression set. | -20℃ to 125℃(-4℉ to 257℉) | -20℃ to 150℃(-4℉ to 302℉) |
| NR | Natural rubber performs well with alcohols and organic acids but suffers from poor resistance to hydrocarbon oils. It is not suitable for exposure to UV light, oxygen, and ozone due to its polymer structure’s double bond. Special additives can improve its weathering resistance, and vulcanization is commonly applied to improve elasticity and prevent decay. | -50℃ to 70℃(-58℉ to 158℉) | -50℃ to 80℃(-58℉ to 176℉) |
| SILICON | Silicone rubber excels in heat resistance, flexibility, durability, and chemical stability, making it suitable for extreme conditions. It can be used with water, steam, most chemicals, and can endure both high and low temperatures, though it is not recommended for contact with 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 (Neoprene) rubber provides excellent resistance to oils, ozone, and weathering, while offering versatile mechanical performance. It is effective in water-based applications and tolerates moderate chemical exposures. However, it is not compatible with aromatic hydrocarbons, ketones, esters, or strong polar solvents, which can cause it to swell or degrade. | -7℃ to 93℃(+20℉ to 200℉) | -7℃ to 107℃(+20℉ to 225℉) |
| IIR | With exceptional gas impermeability, heat resistance, and durability, butyl rubber is perfect for airtight seals and membranes. It is compatible with air, water, oils, and many chemicals, making it useful for sealing across industries. However, it is unsuitable for strong oxidizers, aromatic hydrocarbons, or halogenated solvents, as these can cause swelling or degradation. | -40℃ to 130℃(-40℉ to 266℉) | -40℃ to 150℃(-40℉ to 302℉) |
| PU | Polyurethane rubber is prized for its excellent tear resistance, resilience, and strong resistance to oils, fuels, and abrasion. It performs well in dynamic applications, hydraulic systems, and conditions involving harsh chemicals, making it ideal for seals, wheels, and industrial components. However, it is unsuitable for exposure to esters, ketones, and certain solvents, which can lead to material degradation. | -40℃ to 80℃(-40℉ to 176℉) | -40℃ to 100℃(-40℉ to 212℉) |
| SBR | Styrene-butadiene rubber (SBR) is an economical material known for its strong mechanical properties and superior abrasion resistance. It is versatile in handling fluids like water and weak acids and is perfect for cost-effective, durable applications such as seals, hoses, and gaskets. However, SBR is not recommended for use with oils, fuels, or strong oxidizing agents due to its limited chemical resistance. | -51℃ to 80℃(-60℉ to 176℉) | -51℃ to 100℃(-60℉ to 212℉) |