DN80-PN40-RF Axial Check Valve

Axial Check Valve – Technical Data Sheet

Size: DN80 | Pressure: PN40 | Connection: Flanged RF | Axial Flow Design

1. Main Parts & Materials

2. Dimensions & Weight (Wafer Type – Reference)

Note: Wafer type axial check valves are installed between flanges. Face‑to‑face follows EN 558 Series 48 (basic series 48 for wafer check valves).

3. Axial Check Valve Design Features

1. Axial Flow Path – Streamlined, straight‑through design with minimal pressure drop compared to conventional swing or lift check valves.
2. Non‑Slamming Operation – Spring‑assisted disc returns to seat before flow reversal occurs, eliminating water hammer and noise.
3. Centre‑Guided Disc – Accurate alignment, low wear, and stable operation even at low flow velocities.
4. Compact Wafer Design – Short face‑to‑face length, lightweight, easy to install between existing flanges.
5. Bidirectional or Unidirectional – Standard design is unidirectional; optional double‑directional available.
6. Low Opening Pressure – Spring rate optimized for low cracking pressure (typically 0.02 – 0.05 MPa), suitable for pump protection.

4. Performance Characteristics

5. アプリケーション

• Pump discharge protection (water, oil, chemical pumps)
• Boiler feedwater systems
• Compressed air and gas lines
• HVAC and district heating
• Refining and petrochemical plants
• Marine and offshore (with stainless steel body)

6. Testing & Compliance

7. Advantages Over Conventional Check Valves

8. Ordering Information

Please specify:

• Valve size: DN80
• Pressure rating: PN40
• Connection type: Flanged RF
• Body material: WCB / CF8M / Ductile Iron
• Seat type: Metal / Soft (PTFE)
• Spring material: 316 SS / Inconel
• Special requirements: Low cracking pressure, high temperature (>400°C), NACE, etc.

Notes:

• Axial check valves are bidirectional only if specially ordered; standard design is unidirectional (flow direction arrow on body).
• Wafer type requires appropriate flange bolting length (longer than standard due to valve body thickness).
• For high‑temperature steam service (above 350°C), a metal‑seated version with flexible graphite seals is mandatory.
• Dimensions and weights are typical; confirm with manufacturer drawings.

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