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P.C. Engineering Corporation
Spirax Sarco SDCV Split Disc Check Valves - Wafer Pattern for Steam & Process Lines

Overview

The Spirax Sarco SDCV series split disc check valves are engineered to prevent reverse flow in steam, condensate, hot water, and process fluid systems. These valves follow a compact wafer pattern design, allowing installation between standard PN16, PN40, ASME Class 150, and Class 300 flanges without the need for additional piping modifications.

The SDCV operates using a spring-loaded split disc mechanism. Fluid pressure opens the disc, and when flow stops, the spring immediately closes the valve before any backflow can occur. This fast-acting design protects pumps, heat exchangers, and downstream equipment from damage caused by reverse flow or water hammer.

Available in carbon steel (SDCV3, SDCV7) and austenitic stainless steel (SDCV4, SDCV8) body materials, the SDCV range is suitable for a broad spectrum of industrial applications. Standard configuration includes a metal-to-metal seat; a fluoroelastomer soft seat option is available for enhanced sealing on specific media.

Key Features

  • Wafer pattern design for easy installation between standard flanges
  • Split disc construction with rapid spring-assisted closure
  • Metal-to-metal seat as standard; optional fluoroelastomer soft seat
  • Complies with API 594 (face-to-face dimensions) and API 598 (seat leakage)
  • CE marked per Pressure Equipment Directive 2014/68/EU
  • Available in carbon steel or stainless steel body materials
  • Wide temperature range: –196°C to 500°C (metal seat)
  • EN 10204 3.1 certification available on request

Specifications

ParameterValue
ModelsSDCV3, SDCV4 (ASME); SDCV7, SDCV8 (EN 1092)
Size RangeDN50 (2") to DN300 (12")
Flange CompatibilityPN16, PN40, ASME Class 150, ASME Class 300
Body MaterialCarbon Steel (ASTM A352 LCC) or Stainless Steel (ASTM A351 CF8M)
Disc/Retainer MaterialStainless Steel (ASTM A351 CF8M)
Spring MaterialInconel X750
Seat OptionsMetal-to-metal (standard); Fluoroelastomer (optional)
Max. Operating Pressure (PN40)40 bar g @ 100°C
Max. Operating Temperature (Metal Seat)500°C @ 26.4 bar g
Max. Operating Temperature (Soft Seat)200°C
Min. Operating Temperature (Metal Seat)–196°C
Min. Operating Temperature (Soft Seat)–10°C
StandardsAPI 594, API 598, PED 2014/68/EU

Applications

Spirax Sarco SDCV split disc check valves are widely used in:

- Steam distribution and condensate return lines - Hot water heating and HVAC systems - Process pipelines in chemical, petrochemical, and pharmaceutical plants - Boiler feed water systems - Cooling water circuits - General industrial process lines requiring backflow prevention

Note: The SDCV is not recommended for "banking" boiler steam header applications.

Frequently Asked Questions

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Spirax Sarco SDCV Split Disc Check Valves - Wafer Pattern