Spirax Disc Check Valve
Spirax Sarco DCV8 Disc Check Valve: High-Pressure & High-Temperature Flow Control
The Spirax Sarco DCV8 is an all-stainless-steel, wafer-pattern disc check valve designed to prevent reverse flow across aggressive chemical lines, high-pressure steam, gases, and thermal fluids. Sandwiched neatly between DIN 2501 or EN 1092 pipe flanges, its compact face-to-face design conforms strictly to EN 558 part 1, series 49.
Constructed with a WS 1.4408 austenitic stainless steel body and equipped with an M8 earthing connection, the DCV8 prevents static build-up while operating safely under extreme temperatures up to 400°C and pressures up to 40 bar(g).
Core Operating Features & Advantages
- All-Stainless-Steel Build: Engineered with WS 1.4408 body and ASTM A276 316 disc for high resistance against aggressive acids, alkalines, and superheated vapors.
- M8 Earthing Tapping: Features an integrated M8 threaded tapping for electrical continuity and earthing in hazardous environments.
- Flexible Spring Options: Available with standard, heavy-duty (700 mbar for boiler feed), high-temperature (Nimonic 90 alloy), or springless options for vertical upward flow.
- Tight Shut-Off Compliance: Standard metal-seated versions comply with EN 12266-1 Rate D, while optional Viton/EPDM soft seats achieve zero-leakage Rate A performance.
- Non-Maintainable Unit: Single-piece wafer body design with no field spare parts simplifies pipeline layout and reduces potential leak paths.
Technical Specifications & Operating Limits
|
Parameter |
Technical Specification |
|
Brand / Model |
Spirax Sarco DCV8 |
|
Available Sizes |
DN15, DN20, DN25, DN32, DN40, DN50, DN65, DN80, DN100 |
|
Flange Compatibility |
EN 1092 / DIN 2501 PN10, PN16, PN25, and PN40 (Note: DN100 does not fit between PN16/PN25) |
|
Max Allowable Pressure (PMA) |
40 bar(g) @ 50°C |
|
Max Allowable Temperature (TMA) |
400°C @ 25.6 bar(g) |
|
Min Operating Temperature |
-196°C |
|
Body Material |
Austenitic Stainless Steel WS 1.4408 |
|
Disc Material |
Austenitic Stainless Steel ASTM A276 316 |
|
High Temp Spring Material |
Nimonic 90 Nickel Alloy |
Installation & Orientation Rules
- Plane Orientation: Spring-loaded models can be installed in horizontal, vertical, or angled pipelines.
- Springless Operation: Options supplied without an internal spring ('W' variant) must be fitted strictly in vertical lines with bottom-to-top upward flow.
- Flow Direction: Align the fluid flow direction with the directional arrow marked clearly on the outer valve body.
- Pulsating Limits: Do not install directly downstream of reciprocating pumps or compressors subject to heavy flow pulsation.
