Flow conditions
Provide medium, normal and minimum flow, and any expected reverse flow or fluctuations.

Check valves limit reverse flow. Beyond size and pressure class, review flow conditions, installation orientation and system start-up and shutdown.
Size, rating, materials and delivery configuration are subject to the approved data sheet.
Provide medium, normal and minimum flow, and any expected reverse flow or fluctuations.
Confirm suitability for horizontal or vertical installation for the selected design and check the flow marking.
Describe frequent cycling, water hammer or impact concerns as part of the system review.
Sizes are organized from the company’s historical catalogues for preliminary selection. Current availability, pressure–temperature limits, materials and dimensions are subject to approved data sheets and drawings.
Bolted cover · Swing type disc · RF/BW/RTJ dimensional options
| Pressure class | Port designation | NPS (in) | Reference |
|---|---|---|---|
| Class 150 | — | 1-1/2 · 2 · 2-1/2 · 3 · 4 · 5 · 6 · 8 · 10 · 12 · 14 · 16 · 18 · 20 · 24 · 30 · 36 | Catalogue pp. 17, 18 |
| Class 300 | — | 1-1/2 · 2 · 2-1/2 · 3 · 4 · 5 · 6 · 8 · 10 · 12 · 14 · 16 · 18 · 20 · 24 · 30 · 36 | Catalogue pp. 17, 18 |
| Class 600 | — | 2 · 2-1/2 · 3 · 4 · 6 · 8 · 10 · 12 · 14 · 16 · 18 · 20 · 24 · 26 · 28 · 30 | Catalogue pp. 19, 20 |
| Class 900 | — | 2 · 2-1/2 · 3 · 4 · 6 · 8 · 10 · 12 | Catalogue pp. 19, 20 |
| Class 1500 | — | 2 · 2-1/2 · 3 · 4 · 6 · 8 · 10 · 12 | Catalogue pp. 19, 20 |
| Class 2500 | — | 2 · 2-1/2 · 3 · 4 · 6 · 8 · 10 · 12 | Catalogue pp. 19, 20 |
Pressure seal cover · Swing type disc
| Pressure class | Port designation | NPS (in) | Reference |
|---|---|---|---|
| Class 900 | — | 2 · 2-1/2 · 3 · 4 · 6 · 8 · 10 · 12 · 14 · 16 | Catalogue pp. 23, 24 |
| Class 1500 | — | 2 · 2-1/2 · 3 · 4 · 6 · 8 · 10 · 12 · 14 · 16 | Catalogue pp. 23, 24 |
| Class 2500 | — | 2 · 2-1/2 · 3 · 4 · 6 · 8 · 10 · 12 | Catalogue pp. 23, 24 |
Medium, flow, pressure, temperature, installation orientation, system transients, size and ends.
Download the enquiry worksheetMedium. Pressure. Temperature. Size. Tell us what your project needs.