Aira Pneumatics
Aira Pneumatics

Welcome to Aira Pneumatics, your trusted partner in pneumatic solutions and valve systems in India. As an authorized dealer for renowned brands such as Airmax Pneumatics, Aira Valves, Cair, SuzhiK, 4MA, Yukon, and Hydint, we are committed to delivering innovative and high-quality products tailored t... Read more

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Double Offset Damper Butterfly Valve

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Double Offset Damper Butterfly Valve

AIRA offers FEP / PFA lined valves, engineered for superior performance in highly corrosive applications including Chlorine, Benzene, Sulphuric Acid, Nitric Acid, Phosphoric Acid, Hydrochloric Acid, and Sea Water.
Manufactured using virgin grade resin and thick fluoropolymer linings, these valves ensure exceptional resistance against corrosive chemical effects, absorption, and swelling.

Specifications & Standards
  • Design & Manufacture: API 609 Category A / BS-EN-593
  • Valve Face To Face Dimension: API 609 Category A
  • Inspection & Testing: API 598 / BS EN 12266 PART-1
  • Leakage Class: Class VI
  • End Connection: Wafer Type
  • Valve Rating: Flanged 150#
  • Spark Test: 15 KV DC to 40 KV DC
  • Body Type: Wafer Type
  • Stem Material: CF8, CF8M, WCB + ENP, Hastelloy, Duplex, Monel, CF3M
  • Size Range: 1.1/2'' to 24'' (50MM to 600MM)
  • Temperature Range: -50°C to 300°C for Soft Seated Valves (Contact for special requirements)
  • Pressure Class: PN-6
  • Body Material: Cast Iron (CI), Ductile Iron (DI), S.G. Iron (SGI), WCB, CF8, CF8M, CF3M, SS 304L, Duplex, Hastelloy, Monel
  • Disc Material: CF8, CF8M, WCB + ENP, Hastelloy, Duplex, Monel, CF3M
  • Sleeve Material: PTFE, RPTFE, CFT, GFT, TFM-1600, AIRA-250, Nylon, Devlon, PEEK
  • Flanged Drilling: ISO 5211 II
  • Fugitive Emissions: Yes
  • Shut Off Rating: Class VI
Features & Benefits
1 – Upper Stem Bushing: Acetal (standard) or PTFE (optional) bushing retained by a stainless steel ring, absorbs actuator side thrust.
2 – Upper Stem Seal: Protects stem bore from environmental contaminants.
3 – Body: Two-piece wafer or lug style, epoxy coated, complies with ASME Class 150 / DIN 3840 flange drilling; 24” is double flanged.
4 – Bearings: PTFE-impregnated steel bearings ensure precise alignment of upper and lower stem.
5 – Blowout Proof Stem: Machined upper stem shoulder ensures positive stem-to-disc connection through press-fit assembly.
6 – Primary Seal: Achieved via interference fit between extra wide disc hubs and contoured seat.
7 – Seat Design: Unique geometry reduces seating/unseating torque and minimizes wear on contact surfaces.

Direct Mounting As Per ISO 5211

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