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
Size Range
NPS 22 to 120 / DN 550 to 3000
Temperature Range
-20°F to 400°F (-29°C to 204°C)
Maximum Allowable Operating Pressure
Series 35: 75 psi (5 bar)
Series 36: 150 psi (10 bar)
Series 36: 150 psi (10 bar)
Specifications
Resilient Seated Butterfly Valve - Series 35/36
Size Range
NPS 22 to 120 / DN 550 to 3000
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
Maximum Allowable Operating Pressure
Series 35: 75 psi (5 bar)
Series 36: 150 psi (10 bar)
Series 36: 150 psi (10 bar)
Seat Materials
EPDM, BUNA, and FKM
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
Flange Drilling
ASME B16.1 Class 125, ASME B16.5 Class 150, ASME B16.47, EN 1092 PN 10, 16
Testing Standard
MSS SP-61, API 598, EN 12266-1
Certifications
ABS, ATEX, Bureau Veritas, DNV, NSF 61/372, PED, PE(S)R, SIL
Face to Face
API 609 Category A, EN 558 Series 20
applications
Water, Wastewater, Seawater, other liquids and gases
Features & Benefits
-
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.
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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.
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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.
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D. Stem Bearings
To absorb actuator side thrust and minimize bearing friction torque, upper and lower heavy wall sleeve bearings are utilized.
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E. Vertical Thrust Bearing
A brass vertical thrust bearing eliminates disc displacement due to the weight of the stem and disc.
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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.
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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.
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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.