Resilient Seated Butterfly Valves
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RESILIENT SEATED Butterfly Valves

INDEX Page Butterfly Valves Series 20 wafer Series 3A double flanged Series 3AH double flanged Series 35 double flanged Series 36 double flanged Series 36H double flanged Series 35F double flanged

Product Quality & precision Through years of field application experience, research and development, we have designed products that meet the stringent requirements of today’s flow control industry. Bray has earned a reputation for excellence by creating products of superior value and quality, providing personalized customer service and on-time deliveries. Our success has always been the direct result of our fully integrated range of butterfly valve and control products. Rugged and reliable, our products are engineered to provide years of trouble free service. Bray manufacturing facilities...

Design benefits isolation from line media achieved in two fundamental design concepts: A. Internal Disc/Stem Connection Bray offers three disc-to-stem connections: Double ‘D’, Splined, and Double Key. These internal, non-wetted connections eliminate exposed external disc-to-stem connections such as screws or taper pins. 1. Double D: precision machined flats on the stem and in the disc. Sizes 2”– 20” (50mm–500mm) 2. Spline: male splines in the stem and female in the disc. Standard Sizes 22”– 48” (550mm–1200mm) Selected Sizes 54”– 120” (1400mm–3000mm) 3. Double Keyed: keyways machined into...

external Coating OPtions POLYESTER BODY COATING Bray’s standard product offers valve bodies with a polyester coating, providing excellent corrosion and wear resistance to the valve’s surface. The Bray polyester coating is a hard, gloss red finish. SEACORR Coating: FDA Epoxy pigmented with 316L Stainless Steel Flake available for corrosive environments as tested per ASTM B-117 salt spray test for 2000 hours. Chemical Resistant Resists a broad range of chemicals including dilute acids and alkalis, petroleum solvents, alcohols, greases and oils. Also offers outstanding resistance to humidity...

SEAT MATERIALS Seat Temperature Ranges EPDM (Peroxide Cured) EPDM is the abbreviated name for Ethylene Propylene Diene Monomer. In general industry, one may see other abbreviations or trade names used in lieu of EPDM such as EPT, Nordel, ECD, or EPR. Typically these are the same materials as EPDM. EPDM is a standard seat material offered in Bray resilient-seated butterfly valves. It is the most universal and economical of seat materials offered by Bray; that is, it may be used in a wider range of applications than BUNA-N. Of important significance also is the fact all EPDM seat materials...

SEAT MATERIALS Seat Temperature Ranges PTFE LINED EPDM (Standard or High-temp) PTFE lined EPDM seat consists of a PTFE liner which forms the faces and the flow way of the seat, and is molded on to an EPDM elastomer backing. Only the inert non-stick PTFE liner surface is exposed to the line media. The EPDM backing acts as a resilient support to the relatively rigid PTFE. These seats are generally used where BUNA-N and EPDM seats are not chemically suitable, especially in corrosive services. VIRGIN PTFE All Bray PTFE seats and encapsulated discs are molded from pure, virgin PTFE material to...

Series 20/21 1”-20” (25mm-500mm) Pressure RatingS Bidirectional Bubble-tight Shut-Off Downstream Flanges/Disc in Closed Position Resilient Seated Metal Disc/Stem PTFE Molded Disc/Stem PTFE Seated Resilient Molded Disc/Stem 2-20” (50-500mm) Metal Disc/Stem Dead-End Service – Lug Bodies No Downstream Flanges/Disc in Closed Position 1-12” (25-300mm) Body: 250 psi (17.2 Bar) CWP Velocity Limits For On/Off Services: Fluids 30 ft/sec (9 m/s) The Series 20/21 valve not only surpasses the high standards required in sanitary valve applications, and inherent flow characteristics and capabilities....

All Bray valves are pressure tested to 110% of rated pressure to assure bubble tight shutoff. STANDARD MATERIALS SELECTION Name Cast Iron Ductile Iron 316 Stainless Steel Aluminum Disc/Stem Metal: 1”-12” One Piece Investment Cast 316 Stainless Steel Hastelloy® C-22 14”-20” Fabricated 316 Stainless Steel disc with 316 Stainless Steel stem Hastelloy® disc with Hastelloy® stem Rubber Molded: 2”-12” One Piece Investment Cast EPDM molded over one piece Stainless Steel disc/stem BUNA-N molded over one piece Stainless Steel disc/stem 14”-20” Fabricated EPDM molded over Stainless Steel disc with...

Pressure RatingS Bidirectional Bubble-tight Shut-Off Downstream Flanges/Disc in Closed Position All Valves Dead-End Service – Lug Bodies No Downstream Flanges/Disc in Closed Position 2-12” (50-300mm) Body: 250 psi (17.2 Bar) CWP Velocity Limits For On/Off Services: Fluids 30 ft/sec (9 m/s) Temperature Ratings PTFE: 0ºF(-18ºC) min. – 392ºF(200ºC) max UMMWPE: 0ºF(-18ºC) min. – 185ºF(85ºC) max Extensive field research and engineering have developed this state-of-the-art design which provides excellent shut off protection (bubbletight shut off) and high Cv values. The Series 22/23 is crafted in...

All Bray valves are pressure tested to 110% of rated pressure to assure bubble tight shutoff. SEAL CAPSULE: (Secondary Seal) This seal capsule fully isolates the valve body and stem from the line media. The Seal Capsule is made of a virgin PTFE enclosing the internal energizer. The capsule fits into grooves machined in the upper and lower disc hubs. When compressed between the disc and seat during assembly, the capsule becomes energized, exerting both upward and downward pressure on disc and seat surfaces. STANDARD MATERIALS SELECTION Name Ductile Iron Stainless Steel Carbon Steel Stainless...

Series 30/31 2”-20” (50mm-500mm) Pressure Ratings Bidirectional Bubble-tight Shut-Off – Standard Disc* Downstream Flanges/Disc in Closed Position Standard Disc* Dead-End Service – Lug Bodies/Standard Disc* No Downstream Flanges/Disc in Closed Position Body: 250 psi (17.2 Bar) CWP *For low pressure application, Bray offers a standard reduced disc diameter to decrease seating torques and extend seat life, thus increasing the valve’s performance and reducing actuator costs. Velocity Limits For On/Off Services: Fluids 30 ft/sec (9 m/s) High strength through-stem design allows easy disassembly...