Product Overview
Fire tested certified butterfly valve for industrial fire protection and pressure control
Reliable Bubble-Tight Seal Valve for High Pressure Industrial Environments
Technical Specifications
| Item | Parameter |
|---|---|
| Size Range | NPS 2 to 12 / DN 50 to 300 |
| Body Material | Ductile Iron, Carbon Steel, Nickel Aluminum Bronze |
| Temperature Range | 0°F to 212°F (-18°C to 100°C) |
| Stem Material | Stainless Steel, 17-4PH Stainless Steel, Monel K500 |
| Maximum Allowable Operating Pressure | 285 psi (20 bar) |
| Seat Material | Bonded BUNA-N |
| Seat Class | Bidirectional Bubble-tight |
| Disc Material | 316 Stainless Steel, Monel K500, Nickel Aluminum Bronze |
| Body Type | Lug |
| Flange Drilling | ASME Class 150, EN 1092 PN 10, 16, 25 |
| Testing Standard | API 598, EN 12266-1 |
| Certification | ABS, ATEX, CRN, DNV, D.O.T. 54, NSF 61/372, PED, PE(S)R |
| Face-to-Face | API 609 Category A, EN 558 20 Series |
| Application | High Pressure Industrial and Marine Dead-End Service Onshore and Offshore Fire Protection |
Features and Benefits
A Modular Design
All Bray manual gear operators, electric, and pneumatic actuators mount directly to the S31U without the need for a bracket.
B Stem Bushing
Non-corrosive heavy-duty acetal bushing absorbs actuator side thrust.
C Stem Packing
Patented stem retaining ring and C-clip prevent accidental stem disassembly during field service.
D Seat Design
Bray’s tongue and groove bonded resilient seat design features lower torque than many valves on the market today and fully isolates the fluid media from all valve components (except the disc) through a complete seal design. The seat features a molded tangential O-ring, eliminating the need for any flange gaskets.
E Primary and Secondary Seals
These stem packings prevent pipe media from contacting the stem or body. The primary seal is achieved through interference fit with the molded seat flats on the disc hub. The secondary seal is achieved through a larger stem diameter than the seat stem hole diameter.
F Neck
Extended neck length allows for pipe insulation and easier access to the operator.
G Body
One-piece lug flange configuration, available in polyester coated ductile iron/carbon steel or uncoated nickel aluminum bronze. All bodies can be drilled to conform to ASME 125/150, PN10/16, or other international flange standards.
H Stem
High-strength upper and lower stems feature precision tolerance double D-shaped disc drive connection. This keeps stem retention components out of the pipe media and, unlike disc screws and taper pins, is easy to disassemble for maintenance.
I Disc
Castings are spherically machined and hand-polished to provide bubble-tight sealing with minimum torque and extended seat life.