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Butterfly Valves Series 30/31


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Bray Controls
Sanitary and Chemical
Resilient Seated

Wafer/Lug 1"-20" (25mm - 500mm)

2"-20" (50mm-500mm) Bray Controls is proud to offer a high quality line of butterfly valves to meet the requirements of today's market. Combining years of field application experience, research and development, Bray has designed many unique features in the Series 30/31 not previously available. The results are longer service life, greater reliability, ease of parts replacement and interchangeability of components.

DISC AND STEM CONNECTION Features a high-strength through stem design. The close tolerance, double "D" connection that drives the valve disc is an exclusive feature of the Bray valve. It eliminates stem retention components being exposed to the line media, such as disc screws and taper pins, which commonly result in leak paths, corrosion, and vibration failures. Disc screws or taper pins, due to wear and corrosion, often require difficult machining for disassembly. Disassembly of the Bray stem is just a matter of pulling the stem out of the disc. Without fasteners obstructing the line flow, the Series 30/31 Cv values are higher than many other valves, turbulence is reduced, and pressure recovery is increased. The stem ends and top mounting flange are standardized for interchangeability with Bray actuators.

DISC Casting is spherically machined and hand polished to provide a bubbletight shut off, minimum torque, and longer seat life. The disc O.D. clearance is designed to work with all standard piping.

STEM RETAINING ASSEMBLY The stem is retained in the body by means of a unique Stainless Steel Spirolox retaining ring, a thrust washer and two C-rings, manufactured from brass standard, stainless steel upon request. The retaining ring may be easily removed witha standard hand tool. The stem retaining assembly prevents unintentional removal of the stem during field service.

STEM BUSHING Non-corrosive, heavy duty acetal bushing absorbs actuator side thrusts. STEM SEAL Double?"U" cup seal design is self-adjusting and gives positive sealing in both directions. Prevents external substances from entering the stem bore.

NECK Extended neck length allows for 2" of piping insulation and is easily accessible for mounting actuators.

PRIMARY AND SECONDARY SEALS The Primary Seal is achieved by an interference fit of the molded seat flat with the disc hub. The Secondary Seal is created because the stem diameter is greater than the diameter of the seat stem hole. These seals prevent line media from coming in contact with the stem or body

BRAY UNIQUE SEAT DESIGN One of the valve's key elements is Bray's unique tongue and groove seat design. This resilient seat features lower torque than many valves on the market today and provides complete isolation of flowing media from the body. The tongue-and-groove seat to body retention method is superior to traditional designs, making field replacement simple and fast. The seat is specifically designed to seal with slip-on or weld-neck flanges. The seat features a molded O-ring which eliminates the use of flange gaskets. An important maintenance feature is that all resilient seats for Bray butterflyvalves Series 20, 21, 30, 31 and 34 arecompletely interchangeable.

ACTUATOR MOUNTING FLANGE AND STEM CONNECTION Universally designed to ISO 5211 for direct mounting of Bray power actuators and manual operators.

FLANGE LOCATING HOLES Provide quick and proper alignment during installation.

BODY One-piece wafer or lug style. Polyester coating for excellent corrosion resistance. Bray valve bodies meet ANSI 150 pressure ratings for hydrostatic shell test requirements.

  • Model: Series 31/31
  • Manufactured by: Bray

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