Resilient-Seated Wafer Style Butterfly Valves

The STW/STL is a resilient seated 125/150, ductile iron, high performance wafer style (STW) or lug style (STL) butterfly valve available with either BUNA-N or EPDM seats and a choice of disc materials (316SS, nickle plated ductile iron, or bronze). It can be equipped with a manual handle or with pneumatic or electric actuators. A full range of accessory items are available including limit switches, solenoid valves, positioners and manual override devices.

Features & Benefits

• Economy & high performance
• One-piece body construction and self-centering disc.
• Seat facing acts as flange gasket.
• 3 shaft bushings support actuation.
• Shaft sealing against external leakage
• Meets MSS SP-67 and API-609 specs.
• Complete line of accessories
  

Materials

• Seat - BUNA-N or EPDM
• Disc - 316 SS - standard
  (nickel plated D.I. or bronze available)
• Body - Epoxy Coated Ductile Iron

Available Actutors

• Electric
• Pneumatic (spring return)
• Pneumatic (double acting)
• Manual Handle Lever
• Manual Geared Hand Wheel
• Manual Handle with Limit Switch

Specifications

• Temperature Range:
  -4 to 194 °F (BUNA-N)
  -22 to 230 °F (EPDM)
  
  
• Max. Pressure:
  225 PSI (2" to 12")
  160 PSI (14" to 24")
  
  
• Pressure Testing:
  Body Hydro: 343 PSI (24 Bar)
  Seat Hydro: 243 PSI (17.6 bar)
  
  
• Dead End Service: (Lug type only)
  Downstream Flange is recommended
  150 PSI (2" to 12")
  100 PSI (14" to 24")
  

End Connection

• 2" to 12" Wafer Flange
• 2" to 24 " Lugged Flange
  

Typical Applications

• Water and waste effluent treatment plants
• Paper, textiles and sugar industry
• Construction industry, and drilling production
• Heating, air conditioning, and cooling water circulation
• Pneumatic conveyors, and vacuum applications
• Compressed air, gas and desulphurization plants
• Brewing, distilling, and chemical process industry
• Transportation and dry bulk handling
  Power industry

STW (Wafer Style)
STL (Lug Style)