Butterfly Valves

Watts Series DBF resilient seated butterfly valves are available in sizes 2" - 12" (50-300mm), wafer or lug body design. This series was designed to meet the stringent requirements for HVAC, Irrigation, OEM, Commercial and Institutional applications, and wherever positive shut-off is required for liquids, gases, and slurries. Incorporating a 200 psi (13.8 bars) pressure rating for 2" - 12" (50- 300mm), the Series DBF is standardly constructed of a cast iron body, ductile iron, aluminum bronze or 316SS disc, and 416SS shaft. Standard seat materials available include Buna-N, EPDM, and Viton®. A phenolic-backed seat prevents the seat from col-lapsing or dislodging and can be replaced in the field. In addition to the above features, the Series DBF mounting pad design can easily accommodate a lever handle, gear operator, and electric or pneumatic actuator. The Watts Series DBF butterfly valves are designed and manufactured for use with ANSI 125 or 150 Class flanges and to com-ply with API 609 and MSS-SP-67.

FEATURES

OPERATORS - Ten-position handle is standard. An infinite po-sitioning/locking handle is also available on valve sizes 2" - 12" (50-300mm). The infinite position Pos-Lok throttle plate incorpo-rates a memory stop and a padlocking device in the fully closed position. Manual, worm-gear operators are available for all valves and are recommended on 8" (200mm) and larger sizes. Watts butterfly valves are also available with electric or pneumatic actuators and chain wheel operators to satisfy a wide variety of requirements.

SHAFT - One-piece shaft delivers positive disc-to-seat location with maximum strength. 416SS is standard with aluminum bronze and ductile iron discs, and 316SS shaft with stainless steel disc.

SHAFT BUSHINGS - Duralon ® bushings (3) provide shaft support for proper shaft alignment and minimal shaft deflection.

SHAFT SEAL - To prevent shaft leakage, the bidirectional shaft seal prevents external contamination of stem area and provides a backup seal to the primary shaft seal formed by the disc/seat interface.

BODY - Watts Butterfly Valves are available in Full Lug (DBF-03) and Wafer (DBF-04) types designed for use between ANSI 125 and 150 flanges. Face-to-face dimensions comply with API 609 and MSS-SP-67. All valves are designed to accommodate 2" of insulation. The standard body material is ASTM A-126 Class B cast iron.

DISC - Disc edge is machined and polished 360° to assure leak tight shutoff while minimizing operating torque. Positive, disc-to- shaft connection is provided by stainless steel precision taper pins that are vibration proof.

SEAT - Phenolic-backed, noncollapsible, resilient seat is me-chanically secured to provide deadend service to the full 200 psi (13.8 bars) pressure rating. Seat face eliminates the need for flange gaskets. Full 360° sealing isolates the body components from the media and provides the primary shaft seal. Available in EPDM, Buna-N, and Viton®. Seat is field replaceable. Actuators The integrally cast, heavy duty four bolt mounting pad, coupled with lower operating torque requirements, provides easy and cost effective automation with a variety of pneumatic and electric actuators.

Watts Regulator Company, 815 Chestnut St., N. Andover, MA 01845. Tel: 978-688-1811; Fax: 978-689-6247.