STEAM TURBINE BYPASS VALVES MODEL DSCV-SA
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STEAM TURBINE BYPASS VALVES MODEL DSCV-SA - 1

STEAM TURBINE BYPASS VALVES MODEL DSCV-SA

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STEAM TURBINE BYPASS VALVES MODEL DSCV-SA - 2

Copes-Vulcan has been providing control valves and desuperheaters for the power, process and nuclear industries since 1903. Copes-Vulcan provides a wide range of valves for the control of pressure, temperature and fl ow-induced noise in all types of power plants. Products include severe service and general service control valves, variable orifi ce desuperheaters, Raven™ trim and steamconditioning valves and nuclear control valves, as well as custom designed speciality valves. Copes-Vulcan is recognized worldwide as a leader in valves for severe and critical service applications. Our strength...

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STEAM TURBINE BYPASS VALVES MODEL DSCV-SA - 3

TYPICAL PRODUCT THEORY OF OPERATION Steam atomization has several benefits over mechanically spraying the cooling water via nozzles. Combined Cycle Power Mechanical spray nozzles, even spring loaded types Boiler Main Feedwater Control Valves are limited in their turndown as the water atomization and spray pattern degrade as the water flow rate and available pressure differential reduces. As the water demand reduces, the spray water control valve closes and the spray valve trim absorbs the water pressure differential leaving little pressure differential for the Boiler Feed Pump Minimum Flow...

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STEAM TURBINE BYPASS VALVES MODEL DSCV-SA - 4

PRODUCT FEATURES The DSCV-SA valve has a very tight shut off in the closed position, as a minimum ANSI FCI 70-2 class V. It achieves this tight shut off by utilizing a pilot plug design so that in the closed position, the main plug is unbalanced with the full steam pressure acting on the top of the plug. This load, combined with the actuator Trim Retaining Cap Screws thrust, results in very high seat contact loads, which ensures a very tight shut off. When an open command signal is received, the actuator retracts and the pilot plug is the first Bonnet Split Ring to open. This allows P1 steam to...

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STEAM TURBINE BYPASS VALVES MODEL DSCV-SA - 5

Distribution Spacer of numerous holes evenly positioned around the circumference. This heavy duty distribution spacer has been specifically designed to negate any upstream pipe work induced flow disturbance being communicated to the main plug. Therefore, long radius bends or isolation valves can be fitted directly to the valve inlet to minimize installation space. The main plug is fully guided by the cage and spacer to ensure complete plug stability through full travel. After the inlet steam has passed through the distribution spacer it now travels through the main seat area to the...

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STEAM TURBINE BYPASS VALVES MODEL DSCV-SA - 6

PRODUCT SPECIFICATIONS DESIGN Standard body-to-bonnet joint, up to ANSI 900#, is bolted and incorporates a fully enclosed spiral wound gasket made from 300 stainless steel with graphite filler. Because the DSCV has a split rated design this provides the customer with a convenient point for pipe transition for size, rating and material. As the DSCV-SA is of two-part construction virtually any configuration can be met to satisfy any client requirements. For pressure ratings above ANSI 900# a pressure seal bonnet closure is employed, which utilizes a graphite-sealing ring. SIZES The DSCV-SA is...

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STEAM TURBINE BYPASS VALVES MODEL DSCV-SA - 7

The valve can be manufactured from any material to meet specific design requirements. Standard materials are as shown below: BODY & BONNET PACKING MATERIAL Carbon Steel to ASTM A216 WCB / ASTM A105 Standard Packing is Compressed graphite die Alloy Steel to ASTM A217 WC6 / ASTM A182 F11 formed rings with braided graphite end rings to Alloy Steel to ASTM A217 WC9 / ASTM A182 F22 prevent extrusion of the packing. The packing Alloy Steel to ASTM A217 C12A / ASTM A182 F91 is used in a bolted compression type gland BONNET STUDS AND NUTS The standard body-to-bonnet studs and nut TRIM MATERIAL This...

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STEAM TURBINE BYPASS VALVES MODEL DSCV-SA - 8

DSCV-SA STEAM TURBINE BYPASS VALVES QCOPES VULCAN* SPEED I EXCELLENCE I PARTNERSHIP Celeros Flow Technology Road Two Industrial Estate Winsford, Cheshire CW7 3QL P: +44 1606 552041 F: +44 1606 558275 E: copeinquires@celerosft.com Celeros Flow Technology reserves the right to incorporate our latest design and material changes without notice or obligation. Design features, materials of construction, and dimensional data, as described in this bulletin, are provided for your information only and should not be relied upon unless confirmed in writing. Please contact your local sales...

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