ST Series Resilient Seat Butterfly Valve (Wafer & Lug)
STW: Wafer Style
STL: Lug Style

automated 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

End Connections

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

Available Actuators

  • 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")

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

Certifications & Approvals

  • Meets MSS SP-67 and API-609 Certifications
  • ISO 9001 by LRQA. certificate No.K981064
  • Canada registration No CRN 0C0569.9C valves
  • CE/PED approval... by LLOYDS certification No RPS0160308/01
  • Products approval...South Africa SABS, No.7222/145532/VH136

Installation

  • Wafer valves: Install between flanges and bolts span the body.
  • Lug valves: Install between flanges and bolts are threaded into tapped holes from
    each side of mounting flange.

 
 
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