Series 30/31 Resilient Seated Butterfly Valve

The series 30/31 resilient seated butterfly valve’s high strength through-stem design allows easy disassembly and reduced disc to stem failure.

  • 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 as standard, stainless steel upon request. The retaining ring may be easily removed with a 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 thrust.
  • STEM SEAL: Double “U” cup seal design is self-adjusting and gives positive sealing in both directions.
  • NECK: Extended neck length allows for 2″ of piping insulation and is easily accessible for mounting actuators.
  • DISC: Casting is spherically machined and hand polished to provide a bubble-tight shut off, minimum torque, and longer seat life.
  • BODY: One-piece wafer or lug style. Polyester coating for excellent corrosion resistance. Nylon 11 coating is available as an option.
  • PRIMARY & SECONDARY SEALS: These seals prevent line media from coming in contact with the stem or body. Primary Seal is achieved by an interference fit of the molded seat flat with the disc hub. Secondary Seal is created because the stem diameter is greater than the diameter of the seat stem hole.

Series 20/21 Resilient Seated Butterfly Valve

The Series 20/21 resilient seated butterfly valve surpasses the high standards required in sanitary valve applications, and inherent flow characteristics and capabilities. Bray’s Series 20 valve is a wafer version with flange locating holes, and the Series 21 is the companion lug version for dead-end service and other flange requirements.

Specifications
Size Range: 1″ – 20″ (25mm – 500mm)
Body Style: Wafer, Lug
Temperature Range: -20°F to 400°F (-29°C to 204°C)
Pressure Ratings: Bidirectional Bubble-tight Shutoff: 150 psi (10.3 Bar) Body (CWP): 150 psi (10.3 Bar)
Body Materials: Cast Iron, Ductile Iron, Stainless Steel, Aluminum
Disc/Stem Materials: Stainless Steel, EPDM Molded over SS, BUNA-N Molded over SS
Seat Materials: BUNA-N, EPDM, PTFE Lined EPDM, FKM* Polyurethane
Applications: Sanitary Service, Mildly Corrosive, Toxic Media

Triple Offset Butterfly Valve

The Series 20/21 resilient seated butterfly valve surpasses the high standards required in sanitary valve applications, and inherent flow characteristics and capabilities. Bray’s Series 20 valve is a wafer version with flange locating holes, and the Series 21 is the companion lug version for dead-end service and other flange requirements.

Specifications
Size Range: 1″ – 20″ (25mm – 500mm)
Body Style: Wafer, Lug
Temperature Range: -20°F to 400°F (-29°C to 204°C)
Pressure Ratings: Bidirectional Bubble-tight Shutoff: 150 psi (10.3 Bar) Body (CWP): 150 psi (10.3 Bar)
Body Materials: Cast Iron, Ductile Iron, Stainless Steel, Aluminum
Disc/Stem Materials: Stainless Steel, EPDM Molded over SS, BUNA-N Molded over SS
Seat Materials: BUNA-N, EPDM, PTFE Lined EPDM, FKM* Polyurethane
Applications: Sanitary Service, Mildly Corrosive, Toxic Media