Butterfly Valves for Biogas & Biomass Plants
SS316L ball valves for biogas with H₂S, PVDF-lined butterfly valves for digestate, and IBR-certified gate valves for biomass-fired cogeneration steam boilers.
Which butterfly valves are used for biogas & biomass plants?
Biogas plants and biomass power facilities share the challenges of aggressive, corrosive fluids - raw biogas contains hydrogen sulphide (50–5,000 ppm H₂S), CO₂, and moisture that attack carbon steel; digestate slurry is abrasive and sticky; and biomass-fired boilers require IBR-certified steam valves. Vajra Industrial Solutions supplies the complete valve package for anaerobic digestion and biomass power: NACE MR0103-aware SS316L ball valves for biogas headers, PVDF-lined or rubber-lined butterfly valves for digestate, and IBR gate/globe/check valves for biomass cogeneration boilers.
Butterfly Valve (Rubber-Lined)
Digestate and slurry transfer - abrasive, fibrous, pH 7–8; rubber lining protects body from abrasion
Critical Requirements
- Biogas area (digester headspace, gas collection headers) - ATEX Zone 1; all actuators and accessories must carry Ex certification
- H₂S in biogas - SS316L minimum for all wetted metallic parts; check NACE MR0103 if H₂S > 50 ppm partial pressure threshold
- Digestate with fibrous solids - no wedge gate valves (fibre packs in cavity); use knife gate, rubber-lined butterfly, or pinch valves
- Biogas fire-safe valves - all isolation valves on biogas headers must be fire-safe per API 607; biogas forms explosive mixtures at 5–15% vol in air
- IBR certification for all biomass steam valves above 3.5 kg/cm² - Form III-C and III-E required
- CIP compatibility for digestate valves - rubber seats must withstand 80°C caustic soda wash cycles during cleaning
Service Challenges
- Raw biogas (CH₄ 55–70%, CO₂ 30–45%, H₂S 50–5,000 ppm, H₂O saturated) - corrosive to carbon steel; fire/explosion hazard
- Upgraded biomethane (> 97% CH₄, H₂S stripped) - treated as natural gas; IS 15901 or API 6D applicable
- Digestate slurry - total solids 2–10%; pH 7–8; abrasive plant material; causes wear in standard butterfly valves
- Biogas condensate - slightly acidic H₂S + CO₂ dissolved in water; attacks carbon steel; SS316L or PVC drainage valves
- Biomass combustion ash - silica and alkali-rich; ash handling valves need abrasion-resistant design (knife gate or pinch valve)
Vajra Butterfly Valves
Compact and efficient butterfly valves for large-scale flow control and isolation.
See the full Butterfly Valves rangeOther valves for biogas & biomass plants
Butterfly Valves for other applications
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