Butterfly valve type 21 Lug

The Bray butterfly valve type 21 in lug design is a centric, soft-seated industrial valve for demanding applications in chemical, energy and water technology. The robust cast iron body with corrosion-resistant nylon 11 coating, the one-piece stainless steel disc/shaft unit and the elastomer sealing system ensure high tightness, very good flow characteristics and long-lasting, reliable performance. Thanks to the complete lug design, the type 21 can also be used as an end fitting and can be mounted on both sides – ideal for industrial piping networks and automated process systems.

Special features

• Centric design for optimum flow conditions
• Cast iron housing with corrosion-resistant nylon 11 coating
• One-piece stainless steel disk/shaft unit
• Temperature range: -10 °C to +130 °C
• Nominal pressures: PN10 / PN16
• Lug version: can be mounted on both sides & can be used as an end fitting
• Flanged connection according to DIN EN 1092-1
• Face-to-face length according to ISO 5752 / EN 558 (short pattern)
• Only two wetted parts → Low maintenance requirements
• ISO-5211 mounting for pneumatic and electric actuators

Advantages

• High operational safety thanks to nylon 11 coating and sturdy stainless steel disc
• Very good flow performance due to spherical sealing geometry
• Minimized maintenance effort due to simple, low-wear design
• Ideal for automation thanks to ISO 5211-compatible drive flange
• Standardized dimensions facilitate installation, retrofitting and replacement
• Particularly suitable for water, steam, neutral process media and industrial gases
• Lug design allows use as an end fitting and flexible installation

Variants

• Nominal sizes: DN 25-DN 300
• Gaskets: EPDM, NBR, other materials on request
• Version:
  Lug version (product),
  optional wafer version (type 20)
• Automation options:
  Pneumatic actuators (single/double-acting)
  Electric actuators (24 V / 230 V)
  Limit switch boxes, position indicators, solenoid valves
• Optional: extended corrosion protection, special coatings

Areas of application

• Water and wastewater technology (drinking water, process water)
• Heating and cooling circuits in industrial plants
• Chemical and petrochemical process systems
• Energy and power plant technology (cooling and secondary circuits)
• SKID systems and modular systems
• General industrial processes with liquid and gaseous media
• Piping systems that require end fittings or installation on both sides

Recommendation

In combination with AirTorque actuators and accessories for maximum efficiency and reliability.