Product Overview
Superior sealing performance: tongue and groove seat for bubble-tight shut-off
Certified and Rigorously Tested for Superior Performance
The 35/36 series resilient seated butterfly valves offer the same rugged features as the 32/33 series with the addition of adjustable packing, increasing the maximum valve size to 120” (3000mm), and feature a flexible full-flanged body design. These valves continue the Bray tradition of reliable performance and long service life.
Technical Specifications
| Item | Parameter |
|---|---|
| Size Range | NPS 22 to 120 / DN 550 to 3000 |
| Body Material | Cast Iron, Ductile Iron, Carbon Steel, Stainless Steel |
| Temperature Range | -20°F to 400°F (-29°C to 204°C) |
| Stem Material | 416 Stainless Steel |
| Maximum Allowable Operating Pressure | Series 35: 75 psi (5 bar) Series 36: 150 psi (10 bar) |
| Seat Material | EPDM, BUNA, and FKM |
| Seat Class | Bidirectional Bubble-tight |
| Disc Material | Nylon 11 Coated Ductile Iron, Nickel Aluminum Bronze, Stainless Steel, Duplex Stainless Steel, Super Austenitic Stainless Steel, Hastelloy®, Monel |
| Body Type | Full Flanged |
| Flange Drilling | ASME B16.1 Class 125, ASME B16.5 Class 150, ASME B16.47, EN 1092 PN10, 16 |
| Testing Standard | MSS SP-61, API 598, EN 12266-1 |
| Certification | ABS, ATEX, Bureau Veritas, DNV, NSF 61/372, PED, PE(S)R, SIL |
| Face-to-Face | API 609 Category A, EN 558 20 Series |
| Application | Water, Wastewater, Seawater, Other Liquids and Gases |
Features and Benefits
A Blowout-Proof Stem
A retaining ring installed between the machined stem groove and the gland step retains the stem completely in the unlikely event of an internal stem failure.
B Adjustable Packing System
Supports field adjustment of stem packing without removing the handwheel or electric actuator. Advanced self-adjusting V-type stem packing prevents external substances from entering the upper stem bore.
C 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.
D Stem Bearings
Utilize upper and lower thick-wall sleeve bearings to absorb actuator side thrust, minimizing bearing friction torque.
E Thrust Bearing
Copper vertical thrust bearing eliminates disc displacement caused by stem and disc weight.
F Body
Full-flanged one-piece design. All bodies are drilled to ASME 125/150, PN10, PN16, or other international flange standards. Wafer body also available.
G Disc
High-strength disc is cast, then the sealing lip is spherically machined, followed by hand polishing or Nylon 11 coating of the entire disc. Symmetrical disc geometry enhances CV values, reduces turbulence, and enhances pressure recovery.
H Seat
Replaceable tongue and groove bonded seat with body retention method is the most advanced design in the industry. Features a molded O-ring, eliminating the need for flange gaskets. The seat isolates the valve body and stem from the pipe media, designed specifically to seal against slip-on or weld-neck flanges.