Resilient Seated Butterfly Valve Series 35-36 Bray International

Resilient Seated Butterfly Valve

Series 35/36

Size Range
22 - 120” (550 - 3000mm)
Temperature Range
-20°F to 400°F (-29°C to 204°C)
Pressure Ratings
Series 35: 75 psi (5 bar)
Series 36: 150 psi (10 bar)


Resilient Seated Butterfly Valve - Series 35/36

Size Range
22 - 120” (550 - 3000mm)
Body Materials
Cast Iron, Ductile Iron, Carbon Steel, Stainless Steel
Temperature Range
-20°F to 400°F (-29°C to 204°C)
Stem Materials
416 Stainless Steel
Pressure Ratings
Series 35: 75 psi (5 bar)
Series 36: 150 psi (10 bar)
Seat Materials
Shutoff Rating
Bidirectional Bubble-tight
Disc Materials
Nylon 11 Coated Ductile Iron, Aluminum Bronze, Stainless Steel, Duplex Stainless Steel, Super Austenitic Stainless Steel, Hastelloy®, Monel
Body Style
Full Flanged
Design Standard
Flange Drilling
ASME B16.1 Class 125, ASME B16.5 Class 150, ASME B16.47, EN 1092 PN10 & PN16
Testing Standard
MSS SP-61, API 598, EN 12266-1
ABS, Bureau Veritas, CE/PED, DNV, NSF-61, SIL
Face to Face
API 609 Category A, EN 558 Series 20
Water, Wastewater, Seawater, other liquids and gases

Features & Benefits

The Series 35/36 resilient seated butterfly valve provides the same robust features of the Series 32/33 valves with the addition of adjustable packing, increasing the maximum valve size offered to 120” (3000mm), and utilizing the flexible design of a fully flanged body. These valves hold to the Bray traditions of reliable performance and providing a long service life.

Resilient Seated Butterfly Valve Series 35-36 Features

  • A. Blow-out Proof Stem

    A retaining ring, installed between the machined stem groove and gland retainer step, provides full retention of the stem in the unlikely event of internal stem failure.

  • B. Adjustable Packing System

    Design allows for field adjustment of stem packing without removing manual operators or power actuators. The advanced, self-adjusting V-Type stem packing prevents external substances from entering the upper stem bore.

  • C. 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.

  • D. Stem Bearings

    To absorb actuator side thrust and minimize bearing friction torque, upper and lower heavy wall sleeve bearings are utilized.

  • E. Vertical Thrust Bearing

    A brass vertical thrust bearing eliminates disc displacement due to the weight of the stem and disc.

  • F. Body

    One piece full flanged style. All bodies are drilled to be compatible with ASME 125/150, PN10, PN16 or other international flange standards. Wafer style bodies are also available.

  • G. Disc

    High strength discs are first cast, the sealing edges are spherically machined then either hand polished or the entire disc is Nylon 11 coated. The symmetrical disc profile increases CV values,reduces turbulence and increases pressure recovery.

  • H. Seat

    The replaceable tongue and groove seat to body retention method is the most advanced design in the industry. Molded O-ring eliminates the requirement of flange gaskets. The seat isolates the valve body and stem from line media and has been specifically designed to seal with slip-on or weld-neck flanges.

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