SERIES 3W/3L RESILIENT SEATED BUTTERFLY VALVE
RECOMMENDED SPECIFICATION SHEET
VALVE DETAILS SEAT
> Series 3W/3L Resilient Seated Butterfly Valve > The rubber seat shall be directly molded into the valve
> Wafer | Lug body for optimum performance and a long cycle life.
> NPS 2 to 24 | DN 50 to 600 > The seat shall totally encapsulate the body isolating it
> Bray Series 3W Wafer or Series 3L Lug or approved equal. from the line media.
> No flange gaskets shall be required.
BODY > Seat flange face design shall be tear drop shaped to
> Shall be one-piece wafer or lug design with extended provide maximum sealing surface to mate with many
neck to allow for 2" of piping insulation. flange types and materials.
> Flange locating holes shall be provided on wafer bodies > Lug style design must allow for sealing at full rated
to allow for quick and precise alignment during valve pressure with the downstream flange removed.
installation. > During valve installation and flange tightening, seat
> Flange hole drilling per international flange standard as design must allow disc to be in the closed position
specified. without any performance concerns.
> A non-corrosive bushing and a self-adjusting stem seal
shall be provided. No field adjustment shall be necessary BEARINGS, BUSHINGS, AND STEM SEALS
to maintain optimum field performance. > Provided with top and bottom stem bearings consisting
of a steel/bronze shell with a self-lubricating PTFE
DISC bearing surface.
> Disc edge and hub on metal discs shall be precision > A non-corrosive bushing and a self-adjusting stem seal
machined and polished to minimize torque and maximize shall be provided.
sealing capability. > No field adjustment shall be necessary to maintain
optimum field performance.
STEM
> Shall be one-piece design to maximize disc support and
strength.
> Disc to stem connection shall be an internal double “D”
design with no possible leak paths in the disc-to-stem
connection. External disc-to stem connections such as
disc screws or pins are not allowed.
> Stem shall be mechanically retained in the body neck and
no part of the stem shall be exposed to the line media.
© 2023 BRAY INTERNATIONAL. ALL RIGHTS RESERVED. BRAY.COM EN_RSS_3W_3L RSBV_20230201 1 of 2
SERIES 3W/3L RESILIENT SEATED BUTTERFLY VALVE
RECOMMENDED SPECIFICATION SHEET
APPROVALS AND CERTIFICATIONS DEAD-END SERVICE (LUG BODY ONLY WITH
> CE/PED DOWNSTREAM FLANGE REMOVED)
> ANSI/NSF 61/372 > High Pressure Disc
> EC1935 – NPS 2 to 24 | DN 50 to 600
> FDA Food Contact Approved – 250 psi (17.2 bar)
> ABS Type Approved
> Bureau Veritas Type Approved > Standard Disc
– NPS 2 to 12 | DN 50 to 300
VALVE ACTUATOR MOUNTING PAD – 175 psi (12 bar)
> ISO 5211
– NPS 14 to 24 | DN 350 to 600
TESTING – 150 psi (10.3 bar)
> Manufactured, assembled, and tested in compliance with
a written ISO 9001 quality assurance program. > Low Pressure Disc
> Valve shall be shell tested to 1.5x rated pressure. – NPS 2 to 24 | DN 50 to 600
> Valve shall be leak tightness tested to 1.1x rated pressure. – 50 psi (3.4 bar)
PRESSURE RATINGS
> Valve shall be rated for bubble-tight shut-off at pressure
ratings shown below.
BI-DIRECTIONAL
> High Pressure Disc
– NPS 2 to 24 | DN 50 to 600
– 250 psi (17.2 bar)
> Standard Disc
– NPS 2 to 12 | DN 50 to 300
– 175 psi (12 bar)
– NPS 14 to 24 | DN 350 to 600
– 150 psi (10.3 bar)
> Low Pressure Disc
– NPS 2 to 24 | DN 50 to 600
– 50 psi (3.4 bar)
© 2023 BRAY INTERNATIONAL. ALL RIGHTS RESERVED. BRAY.COM EN_RSS_3W_3L RSBV_20230201 2 of 2
