Resilient Seated Butterfly Valve
Features and Benfits
• Suitable for both gaseous and liquid service
• Phenolic Backed Seat (DN50-DN350) for superior sealing and long term use
• Aluminum Backed Seat (DN50-DN1200) for superior sealing and long term use
• Single-piece stem design assures even torque distribution
• Positive shutoff bi-directionally
• Direct mount automation
• Precision Taper Pins for Shaft
Technical Details
Size Range
DN50 to DN1200
Maximum Allowable Operating Pressure
16 bar
Application Temperature Range
Based on seat material
Body Style
Wafer, Lug
Flange Drilling
EN 1092-1 PN 10 & PN 16
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
Optional Configuration
Body Materials
Low temperature Ductile Iron (EN 5.3103)
Disc Materials
Aluminum Bronze / Stainless Steel / Ductile Iron / Monel
Stem Materials
Stainless Steel (EN 1.4542)
Seat Materials
EPDM / Buna-N / VITON / H-NBR / CSM / NR / SILICON / CR / IIR / PU / SBR / PTFE
Body Configuration
Bare Stem/Handle/Gear Op/Actuated
Temperature Range
| Seat Material | Advantages / Limitations | Continuous Service Temperature Range (>1000 hrs) | Intermittent Service Temperature Range (4 hrs) |
| EPDM | EPDM is a synthetic rubber that offers good performance in high-temperature applications. It is compatible with a wide range of substances, including hot and cold water, glycols, detergents, phosphate esters, ketones, and alcohols. However, it is not compatible with hydrocarbon-based oils and lubricants, nor should it be used in compressed air systems that contain hydrocarbons. | -46℃ to 135℃(-50℉ to 275℉) | -51℃ to 149℃ (-60℉ to 300℉ ) |
| Buna-N/NBR | Buna-N, or Nitrile (NBR), is a widely used material in general-purpose applications like water at ambient temperatures, vacuum, compressed air, salt solutions, alkaline solutions, and aliphatic hydrocarbons. It should not be used with strong oxidizers, nitrated hydrocarbons, ketones, acetates, phenols, aldehydes, or gasoline containing additives. Additionally, Buna-N may swell when exposed to hot water, which can result in an increase in operating torque. | -12℃ to 82℃(+10℉ to 220℉) | -12℃ to 93℃ (+10℉ to 280℉ ) |
| VITON | Viton® is a fluoroelastomer that provides excellent resistance to oils and chemicals, especially in high-temperature environments. It is suitable for use with hydrocarbons and has superior chemical resistance compared to Buna-N. Viton® is also effective for mineral acids, alcohols, and both dilute and concentrated solutions. It is not recommended for high-temperature water or steam, as it may swell. Additionally, Viton® hardens in lower temperature ranges, which can lead to an increase in operational torque. | -12℃ to 177℃(+10℉ to 350℉) | -12℃ to 205℃ (+10℉ to 400℉ ) |
| H-NBR | HNBR rubber compounds exhibit excellent resistance to petroleum-based oils and fuels, aliphatic hydrocarbons, vegetable oils, silicone oils and greases, ethylene glycol, water, and steam up to 150°C (300°F). They also perform well in dilute acids, bases, and salt solutions at moderate temperatures. However, HNBR is not recommended for contact with chlorinated hydrocarbons, esters, ethers, ketones, or strong acids. | -29℃ to 143℃(-20℉ to 290℉) | -29℃ to 180℃(-20℉ to 356℉) |
| CSM | CSM provides superior resistance to ozone, UV, weathering, and chemicals, along with low gas permeability and enhanced heat aging. While it shares some properties with Chloroprene, such as poor low-temperature flexibility and high chemical resistance, it is not suitable for automotive applications due to its poor fuel resistance. Additionally, its poor compression set makes it unsuitable for dynamic sealing applications. | -20℃ to 125℃(-4℉ to 257℉) | -20℃ to 150℃(-4℉ to 302℉) |
| NR | Natural rubber offers good performance in alcohols and organic acids but is less effective in environments with hydrocarbon oils. It is also vulnerable to UV, oxygen, and ozone exposure because of the double bond in its molecular structure. With the addition of specific additives, its weathering resistance can be improved, and vulcanization is used to boost elasticity and durability. | -50℃ to 70℃(-58℉ to 158℉) | -50℃ to 80℃(-58℉ to 176℉) |
| SILICON | With exceptional heat resistance, flexibility, durability, and chemical stability, silicone rubber is ideal for extreme environments. It can be used with water, steam, and most chemicals across a wide temperature range, but should not be used with hydrocarbon oils. Silicone rubber is unsuitable 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 | Neoprene (Chloroprene) rubber is known for its resistance to oils, ozone, and weathering, and offers flexible mechanical properties. It works well in water-based applications and performs well in moderate chemical exposures. However, it is not suitable for use with aromatic hydrocarbons, ketones, esters, or strong polar solvents, as they may cause it to swell or degrade. | -7℃ to 93℃(+20℉ to 200℉) | -7℃ to 107℃(+20℉ to 225℉) |
| IIR | Butyl rubber is known for its excellent resistance to gas permeability, heat, and wear, making it ideal for sealing membranes and airtight applications. It can be used with air, water, oils, and various chemicals. However, butyl rubber is not recommended for use with strong oxidizers, aromatic hydrocarbons, or halogenated solvents, as they can degrade or swell the material. | -40℃ to 130℃(-40℉ to 266℉) | -40℃ to 150℃(-40℉ to 302℉) |
| PU | Polyurethane rubber is known for its superior tear strength, resilience, and resistance to oils, fuels, and abrasion. It excels in dynamic applications, hydraulic systems, and in environments with harsh chemicals, making it ideal for seals, wheels, and industrial parts. However, it should not be used in applications involving esters, ketones, or certain solvents, as these can cause the material to degrade. | -40℃ to 80℃(-40℉ to 176℉) | -40℃ to 100℃(-40℉ to 212℉) |
| SBR | SBR offers excellent mechanical performance and abrasion resistance at an affordable price, making it suitable for use with fluids like water and weak acids. It is commonly used for seals, hoses, and gaskets in non-corrosive liquid handling applications. However, it is not suitable for exposure to oils, fuels, or strong oxidizers due to its limited chemical resistance. | -51℃ to 80℃(-60℉ to 176℉) | -51℃ to 100℃(-60℉ to 212℉) |