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2 DEWRANCE – A PIONEERING HISTORY IN STEAM The DEWRANCE name owes its origin to John Dewrance, a pioneer of steam locomotive development. He was responsible for the construction of George Stephenson’s locomotive “The Rocket”, assisting at the Rainhill trials in 1820. The success of “The Rocket” during these trials resulted in its use on the Liverpool & Manchester Railway. The founders pioneer efforts in connection with the railways naturally influenced his engineering activities and a business was established in South London in 1844. John Dewrance & Co., was soon to become known as an innovative manufacturer of products for steam application. Sir John Dewrance took over control of his father’s business in 1879. Under his guidance, the pioneering work of his father continued. In 1882 he married Isabella Trevithick, granddaughter of Richard Trevithick, one of the leading early railway pioneers. He became a director and Chairman of Babcock & Wilcox Ltd in 1899 a position he held until one year before his death in 1937. At this time, the company became a wholly owned subsidiary of Babcock & Wilcox eventually moving to Skelmersdale in 1965. Today, Dewrance is a part of Tyco International Limited and operates in the Engineered Products Group of the company’s Flow Control Division. Founded 1844 John Dewrance, founder of John Dewrance & Co. Dewrance is ideally positioned to fully meet the many and varied requirements of its customers. Dewrance is best known, and enjoys a worldwide reputation, for its range of Parallel Slide Gate Valves. In addition, the company offers an unrivalled range of other high performance valves for power generation and associated industries. George Stephenson’s ‘Rocket’. A section of the valve engineering department at the Skelmersdale facility.
DEWRANCE CONTROLLING PRESSURE WORLDWIDE The Dewrance business was acquired by Tyco International Ltd in 1998 from Dresser Industries. From the Skelmersdale headquarters, Dewrance provides valve engineering, sales, contracts and administration to support a comprehensive range of line valves including parallel slide valves, check valves and special application products. To keep abreast of customer requirements, Dewrance is committed to continual research and product development. The company is renowned for technical excellence and it’s ability to provide flow solutions to match your application requirements. A 30” Class 300 DEWRANCE Parallel Slide Valve being installed in a UK Power Station. A section of the extensive valve component store at Skelmersdale. Dewrance understand what productivity means to you the customer, and are fully aware of the dangers and costs associated with a shutdown. This is why the company provides a comprehensive valve repair, parts and service capability from the Tyco International valve service facility in Germany, complemented by the Skelmersdale operation where stocks of valve spares are available on a fast turnaround. Being part of the world’s largest valve company, with some of the leading international names in valve, actuator and controls manufacture, positions Dewrance to offer complete valve and control packages from a single source. CONTENTS Page Valve Manufacturing 4 Quality Standards and NDE 6 Line Valve Product Range 8 High Pressure Cast Steel Parallel Slide Gate Valves 11 High Pressure Forged Steel Parallel Slide Gate Valves 33 Low Pressure Cast Steel Parallel Slide Gate Valves 41 High Pressure Steel Check Valves 51 Low Pressure Steel Swing Check Valves 61 Bled Steam Check Valves 69 Feed Water Heater Isolation System 81 Reheater Isolating Device 91 Product Numbering Guide 99 Materials of Construction 100 Recommended Spare Parts Holding 101 3
Page 1: HIGH PERFORMANCE LINE VALVES FOR PO
Page 5 and 6: State of the art machine tools play
Page 7 and 8: QUALITY STANDARD AND NDE Dewrance h
Page 9 and 10: 10 A TOTAL VALVE CAPABILITY - FROM
Page 11 and 12: 12 High Pressure Cast Steel Paralle
Page 13 and 14: Advantages of Venturi Parallel Slid
Page 15 and 16: Pressure/Temperature Ratings (Paral
Page 17 and 18: Pressure/Temperature Ratings (Paral
Page 19 and 20: Cast Steel Parallel Slide Gate Valv
Page 31 and 32: High pressure Forged Steel Parallel
Page 33 and 34: 36 Forged Steel Parallel Slide Gate
Page 39 and 40: 42 Low Pressure Cast Steel Parallel
Page 47 and 48: High pressure Steel Check Valves Si
Page 49 and 50: 54 Pressure/Temperature Ratings (Ch
Page 51 and 52: 56 Forged Steel Swing Disc Check Va
Page 53 and 54:
58 Cast Steel Tilting Disc Check Va
Page 55 and 56:
60 Tilting Disc Check Valve Unique
Page 57 and 58:
62 Low Pressure Steel Swing Check V
Page 59 and 60:
Cast Steel Swing Check Valve Sizes
Page 61 and 62:
Cast Steel Swing Check Valve Sizes
Page 63 and 64:
Bled Steam Check Valve Sizes 6” -
Page 65 and 66:
Product Application Tests Flow Test
Page 67 and 68:
74 Pressure/Temperature Ratings Imp
Page 69 and 70:
76 Bled Steam Check Valve Sizes 6
Page 71 and 72:
78 Bled Steam Check Valve Unique Se
Page 73 and 74:
80 Bled Steam Check Valve - Options
Page 75 and 76:
82 Feed Water Heater Isolation Syst
Page 77 and 78:
Feed Water Heater Isolation System
Page 79 and 80:
Feed Water Heater Isolation Valve S
Page 81 and 82:
Feed Water Heater Isolation Valve S
Page 83 and 84:
Reheater Isolating Device Sizes 16
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Reheater Isolating Device Sizes 16
Page 87 and 88:
96 Pressure/Temperature Ratings Col
Page 89 and 90:
98 Reheater Isolating Device Featur
Page 91 and 92:
100 Materials of Construction ASTM
Page 93:
DEWRANCE HEADQUARTERS IN THE UK UNI
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