BF Series Wafer/Lug Butterfly Valves
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1 BF Series Wafer/Lug Butterfly Valves Engineering Creative Solutions for Fluid Systems Since 1901
2 401 South Highland Avenue Aurora, Illinois phone: Table of Contents Pratt BF Series Butterfly Valves 2" to 48" Construction Specification...1 Features...1 Design Details...2 Suggested Specification...3 CV Flow Data...4 Dimensional Data - Wafer Dimensional Data - Lug...7-8
3 Construction Specification: Pratt BF Series Butterfly Valves Sizes: 2" through 48" Body: Ductile Iron ( ) Disc: Ductile Iron Nickle Plated, Ductile Iron Nylon 11, CF8M Stainless Steel, Aluminum Bronze Stem: 416 S.S. Heat Treated Resilient Seat: EPDM, Buna-N, Viton Actuation Options: Worm Gear, Lever, Pneumatic, Electric Pressure Ratings: 2" 12" 230psi 14" 48" 150psi * For installation between ANSI 125/150 ** Substitute material may result in pressure rating change. Contact factory for details. Valve with Electric Operator Features: Innovative 3 point connection, tongue and groove seat allows for higher pressure rating and full Vacuum service Unique secondary shaft seals prevent leakage from shaft. Our two piece shaft design provides maximum strength and a high flow characteristic disc. Valve with Gear Operator Henry Pratt Company 1
4 Pratt BF Series Butterfly Valve Design Details: Butterfly Valve, sizes 2" through 48" 2"-12" 230psi, 14"-48" 150psi Top flange conforms to ISO 5211 and KV industrial standard allowing a universal mounting pad for automation requirements which is suitable for most actuators in the market. Blowout proof stem meets all API 609 requirements. Our unique design also creates a secondary stem journal seal preventing leakage to atmosphere. A full length Nylatron bushing reduces stem journal friction and reduces torque. Utilizes 2 internally driven shafts creating a strong drive connection and allowing for a thin profile disc creating high Cv's. Thin profile, high tensil strength disc maximizes Cv's and allows for 230psi pressure rating. Henry Pratt Company's unique seat design utilizes 3 tongue and groove connection points to the valve body. Seats remain secure and stable even under high dead-end pressure and full vacuum services. The center tongue not only locks the seat in place, but allows rubber material to flow into the center body groove when cycling the valve, drastically reducing the operating torque. The BF Series bottom cap provides lower stem retention and also creates a secondary stem journal seal preventing external leakage to atmosphere. 2"-12" lower shafts ride on a precision wear guide reducing shaft drag. 14" and larger utilizes an axial bearing to support the weight of the shaft and disc, providing a close to friction-free movement. 2 Henry Pratt Company
5 Suggested Specifications: Pratt BF Series Wafer/Lug Butterfly Valve, Sizes 2" through 48" 2"-12" 230psi, 14"-48" 150psi General Valves shall be of the Wafer or Lug design for installation between ANSI 125/150 flanges. All valves shall be capable of bi-directional, end of line, bubble tight service to rated pressure. Valves are also rated to full vacuum service. Design Standards: API 608 category A. Pressure Rating 2" 12" 230psi to fit between ANSI 125/150 flanges 14" 48" 150psi to fit between ANSI 125/250 flanges Body Valve body shall be a 1 piece Ductile Iron ASTM A-536 ( ) construction with a laying length conforming to the latest revision of ISO 5752 and a flange connection B16.1/B16.5. Disc Valve disc shall be Ductile iron ASTM A-536 Grade with ENP plating or Nylon 11 coating, CF8M Stainless Steel, or Aluminum Bronze. Disc shall be designed to accommodate an upper and lower shaft with a thin center profile giving higher Cv values combined with strength. Seat Seat shall be EPDM, Buna-N or Viton. Seat design shall consist of 3 Tongues (2 located on the side walls and 1 located in the center bore) that engage into 3 groves in the body. These 3 tongue and groove connection points prevent seat movement in a radial and axial direction. Seats shall be field replaceable. Shaft Seals Upper Shaft Seal shall be self-adjusting V-type and shall be suitable for Pressure or Vacuum service. Packing shall be located above the bushing and shall create a positive seal against the Top Cap. Bottom end cap contains a captive o-ring creating a positive seal against external leakage. Bushings Valve shall consist of (2) full length Nylatron bushings (upper and lower) offering superior protection against friction, corrosion and impacts. Pratt's unique bushings design provide protection against shaft side loading. Testing All valves shall be leak tested in the factory at their rated pressure per API 598. Shaft Valve shaft shall be constructed of Heat Treated 416 Stainless Steel. Valve shall be designed to accommodate (2) shafts (1 upper and 1 lower). The upper shaft shall have a positive engagement in the disc utilizing an internal square drive and shall be retained by the body Top Cap and End Cap. Henry Pratt Company 3
6 CV Flow Data: Pratt BF Series BFV During its product development phase, the Pratt BF Series Wafer/Lug Butterfly Valve was tested to ensure that it met our own rigorous standards for flow capacity. Throughout testing, the Pratt BF Series valve has consistently produced high Cv values which translates to lower flow resistance, and in turn, lowering system operating costs to the user over the life of the valve. The following Cv chart represents the flow characteristics for all sizes available. Valve Cv by Valve Size Opening (deg) 2" 2.5" 3" 4" 5" 6" 8" 10" 12" 14" 16" 18" 20" 24" Pratt BF Series Wafer / Lug Butterfly Valves being tested at an independent research laboratory 4 Henry Pratt Company
7 Dimensional Data: Pratt BF Series BFV, Wafer Part No. Part Name Material Qty. 1 Wafer Body DI 1 2 Seat EPDM/NBR/Viton 1 3 Disc SS316/DI/C954/Nylon Lower Stem SS416/SS316/SS Upper Stem SS416/SS316/SS Top Cap 1020 Steel 1 7 End Cap 1020 Steel 1 8 Lower Bushing Nylatron 1 9 Upper Bushing Nylatron 1 10 V-packing NBR 1 11 Washer SS Wear Shim SS O-ring NBR 1 14 Data Plate SS End Cap SS Top Cap SS304 2 Pratt Standard ISO 5211 Alignment Size lbs ΦA ΦB C D E ΦF G ΦH L Key 2" " " " " " " " /4" * 1/4" " /4" * 1/4" Henry Pratt Company 5
8 Part No. Part Name Material Qty. 1 Wafer Body DI 1 2 Disc SS316/DI/C954/Nylon Seat EPDM/NBR/Viton 1 4 Upper Stem SS416/SS316/SS Lower Stem SS416/SS316/SS Top Cap 1020 Steel 1 7 End Cap 1020 Steel 1 8 Upper Bushing Nylatron 1 9 Lower Bushing Nylatron 1 10 V-packing NBR 1 11 Washer SS O-ring NBR 1 13 Bearing Steel 1 14 Top Cap SS End Cap SS304 4 Pratt Standard ISO 5211 Alignment Size Lbs ΦA ΦB C D E ΦF ΦH L Key 14" /16" * 5/16" " /16" * 5/16" " /8" * 3/8" " /2" * 1/2" " /2" * 1/2" Henry Pratt Company
9 Dimensional Data: Pratt BF Series BFV, Lug Part No. Part Name Material Qty. 1 Lug Body DI 1 2 Seat EPDM/NBR/Viton 1 3 Disc SS316/DI/C954/Nylon Lower Stem SS416/SS316/SS Upper Stem SS416/SS316/SS Top Cap 1020 Steel 1 7 End Cap 1020 Steel 1 8 Lower Bushing Nylatron 1 9 Upper Bushing Nylatron 1 10 V-packing NBR 1 11 Washer SS Wear Shim SS O-ring NBR 1 14 Data Plate SS End Cap SS Top Cap SS304 2 Pratt Standard ISO 5211 Top Plate Drilling Tapped Lug Data Size Lbs ΦA ΦB C D E ΦF G ΦH L Key 2" /8" 2.5" /8" 3" /8" 4" /8" 5" /4" 6" /4" 8" /4" 10" /4" * 1/4" /8" 12" /4" * 1/4" /8" Tapped Henry Pratt Company 7
10 Part No. Part Name Material Qty. 1 Lug Body DI 1 2 Disc SS316/DI/C954/Nylon Seat EPDM/NBR/Viton 1 4 Upper Stem SS416/SS316/SS Lower Stem SS416/SS316/SS Top Cap 1020 Steel 1 7 End Cap 1020 Steel 1 8 Upper Bushing Nylatron 1 9 Lower Bushing Nylatron 1 10 V-packing NBR 1 11 Washer SS O-ring NBR 1 13 Bearing Steel 1 14 Top Cap SS End Cap SS304 4 Pratt Standard ISO 5211 Tapped Lug Data Size Lbs ΦA ΦB C D E ΦF ΦH L Key 14" /16" * 5/16" " 16" /16" * 5/16" " 18" /8" * 3/8" /8" 20" /2" * 1/2" /8" 24" /2" * 1/2" /4" No.of Tapped 8 Henry Pratt Company
11 Notes Henry Pratt Company 9
12 PRATT PRODUCT GUIDE Model 2FII Monoflange MKII Plug Valve Triton XR70 Indicating Butterfly Valve UL & FM approved Tilting Disc Check Valve Triton XL N-Stamp Nuclear Butterfly Valve Cone Valve Rectangular PIVA Post Indicating Valve Assembly UL & FM approved Sleeve Valve Rubber Seated Ball Valve Triton HP250 Check Valve Metal Seated Ball Valve Control Systems Plunger Valve Air Valve The trademarks, logos and service marks displayed in this document herein are the property of Henry Pratt Company, LLC, its affiliates or other third parties. Products above marked with a section symbol ( ) are subject to patents or patent applications. For details, visit Copyright 2016 Henry Pratt Company, LLC. All Rights Reserved Henry Pratt Company Printed in the U.S.A. Form /2016
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