Single disc wafer check valve in stainless steel, with a resilient seat ring and a lifting eye. The disc is hinged at the top of the bore and swings clear on forward flow, seating again when flow stops. The unit photographed is cast DN80.
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This is the single-plate member of the wafer check family: one disc, hinged at the top of the body, swinging clear of the seat on forward flow and returning onto it when flow stops. It gives a lower pressure drop than a dual plate valve of the same bore because there is no central hinge column in the flow, at the cost of a longer closing stroke.
The valve photographed is stainless throughout with a resilient seat ring fitted around the seating face — the elastomer is not marked, so NBR, EPDM or FKM should be specified to suit the medium and temperature. The disc is cast DN80, which is the nominal bore of the unit shown and not a part number. A lifting eye is fitted to the body.
API 594 covers this type as a Type A short face-to-face wafer check with a single plate. As with any wafer valve, it is centred on the flange bolts and clamped between two flange faces, so the flange standard and rating are part of the order: ASME B16.5 Class 150/300 and EN 1092-1 PN 10/16/25/40 are drilled differently. Install horizontally or in a vertical riser with the flow upwards, and check the arrow or the hinge position before bolting up.
| Valve Type | Single disc (single plate) wafer check valve — disc hinged at the top of the bore |
|---|---|
| Body and Disc Material | Stainless steel |
| Size Marked on the Unit Photographed | DN80, cast into the disc — a nominal bore, not a part number; confirm the sizes held |
| Seat | Resilient seat ring fitted around the seating face; the elastomer grade is not marked — specify NBR, EPDM or FKM to suit the medium and temperature |
| Body Style | Wafer, with a lifting eye on the body |
| Design Standard for the Type | API 594 — Type A, short face-to-face, wafer body, single plate |
| Flange Compatibility | ASME B16.5 (Class 150/300) and EN 1092-1 (PN 10/16/25/40) are drilled differently and are not interchangeable — state the flange standard and rating on the order |
