Semi-Lug Style Butterfly Valves available from Robert-James Sales, Inc.
Robert-James Sales, Inc.
Robert-James Sales, Inc.
Butterfly Valves

See also Valves Overview

Butterfly Valves

Wafer Style
Full Lug Style
Semi-Lug Style
Grooved End
Dimensions (2"-12")
Dimensions (14"-24")
Elastomer Guide

Superior design and construction of a 200 PSI-WOG (2" - 12") or 150 PSI-WOG (14" - 24") rated butterfly valve will assure years of dependable performance. The advanced design of the dual-durometer phenolic reinforced resilient seat provides a low torque, bubble-tight shutoff.

Designed for ANSI 125/150 lb. class flanges, these valves comply with MSS-SP-25, MSS-SP-67 and API-609 specifications. Also meets requirements of MIL-V-22133C (SHIPS), Type 1. Classes A-D.


  • Cast in-place mounting flange accommodates all types of operators: manual handles and gear operators; pneumatic, hydraulic, diaphragm and electric actuators.
  • Bronze stem bushings are oil impregnated to provide minimum torque and maximum stem support. Heavy duty upper bushing absorbs side loading for maximum operator performance.
  • Each valve hydrostatically tested on both sides to 225 PSI for 2" - 12", 165 PSI for 14" - 24".
  • 10" and 12" wafer types have drilled guide lugs.
  • All full lug bodies are threaded. Drilled holes optional at no extra cost.
  • Long neck design allows ample clearance for insulation.
  • Dual stem seal is between disc and seat spherical hubs (Patent 3565394), additional seal from seat O-ring.
  • Streamlined disc design reduces pressure drop and minimizes turbulence.
  • Resilient seat design eliminates the need for flange gaskets.
  • Phenolic reinforced resilient seat in sizes 2' - 12" is blowout-proof, stretch resistant and non-collapsible, making it ideal for high velocity or vacuum service (up to 28" Hg).
  • Two-piece blowout proof stem design allows field replacement of seats.
  • Twin O-ring seals combined with the primary seal provide triple protection against line medium infiltrating stem journal or atmospheric contamination from entering line,
  • Pressure/temperature rating of ANSI 150, at CWP of 285 PSI at 100 degrees F. Available upon application.
  • Halar and Kynar coated discs available.
Call People Dedicated to Quality

800-666-0088 • Buffalo, NY (HQ)
800-777-2008 • Chicago, IL
800-777-0820 • Cleveland, OH
800-777-1858 • Cranbury, NJ
800-777-2008 • Greenville, WI
800-777-0510 • Indianapolis, IN
800-725-1839 • Los Angeles, CA
877-886-9010 • Phoenix, AZ
800-565-5525 • Raleigh/Durham, NC
800-777-2260 • Salt Lake City, UT
800-777-0510 • Springfield, MO
800-777-1355 • Stockton, CA
800-666-0088 • Tavenier, FL

Robert-James Sales, Inc.
The contents of this website are presented for information purposes only, and while effort has been made to ensure their accuracy, they are not to be contrived as warranties or guarantees, expressed or implied, regarding the products or services described herein or their use or applicability. All sales are governed by our terms and conditions, which are available on request. We reserve the right to modify or improve the designs or specifications of our products at any time without notice. Always verify that you have the most recent product specifications or other documentation prior to the installation of these products.
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