DN80-PN40-RF Axial Check Valve
DN80-PN40-RF Axial Check Valve - Image 2
DN80-PN40-RF Axial Check Valve - Image 3
DN80-PN40-RF Axial Check Valve - Image 4

DN80-PN40-RF Axial Check Valve

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Description

Axial Check Valve – Technical Data Sheet

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

Item Specification
Product Name Axial Flow Check Valve (Nozzle Type / Non‑Slamming)
Nominal Size DN80
Pressure Rating PN40 (4.0 MPa / 40 bar / 580 psi)
Connection Type Flanged, Raised Face (RF)
Flange Standard EN 1092‑1 (Type B1 or B2) / ASME B16.5 optional
Design Standard API 594 (Type B – wafer or lug) or manufacturer specific
Face‑to‑Face Dimension Wafer type: per API 594 / EN 558 Series 48 (approx. 60 – 70 mm)
Construction Axial flow – streamlined body, centre‑guided disc, spring‑assisted closure
Body Material WCB (Carbon Steel) / CF8M (316 SS) / Ductile Iron
Disc / Trim Stainless steel (CF8M) with optional Stellite hardfacing
Sealing Metal‑to‑metal or soft seated (PTFE / NBR) optional
Spring Material Stainless steel (316)
Temperature Range -29°C ~ +425°C (depending on materials)
Applicable Media Water, steam, oil, gas, chemicals, petrochemicals

1. Main Parts & Materials

Component Material (Standard) Optional Material
Body WCB (carbon steel) CF8M (316 SS), CF3M (316L), Ductile Iron (GGG40)
Disc (Piston) CF8M (316 SS) CF8 (304 SS), duplex, with Stellite overlay
Seat Integral with body, Stellite faced PTFE insert (soft seated)
Spring 316 SS Inconel, Hastelloy
Guide / Shaft 316 SS 17‑4PH, Monel
Gasket Spiral wound (SS + graphite) PTFE, graphite sheet
Bolting A193 B7 / A194 2H (for WCB body) A193 B8 / A194 8 (for SS body)

2. Dimensions & Weight (Wafer Type – Reference)

Dimension mm (approx.) inch (approx.)
Face‑to‑Face (L) 65 – 75 2.56 – 2.95
Flange Compatibility PN40 EN 1092‑1 –
Outer Diameter (flange OD) 200 (for PN40 DN80 flange) 7.87
Overall Length (including flanges) depends on mating flanges –
Weight (valve body only) ~6 – 10 kg ~13 – 22 lbs

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

Characteristic Value
Cracking Pressure ≤ 0.03 MPa (0.3 bar) for standard spring
Maximum Operating Pressure 4.0 MPa (PN40)
Maximum Operating Temperature 425°C (with graphite seals)
Leakage Rate Zero leakage (soft seat) / Class IV (metal seat)
Flow Coefficient (Cv) High – typically >0.8 x pipe Cv due to streamlined design

5. Applications

  • 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

Test Standard / Requirement
Shell Test 1.5 × PN40 (6.0 MPa) – no leakage
Seat Test (low pressure) 0.6 MPa (6 bar) – per API 598
Seat Test (high pressure) 1.1 × PN40 (4.4 MPa) – zero leakage for soft seat
Hydrostatic strength EN 12266‑1 / API 598
Material Traceability EN 10204 3.1 (optional)
Marking EN 19 / MSS SP‑25

7. Advantages Over Conventional Check Valves

Feature Axial Check Valve Swing / Lift Check Valve
Pressure drop Very low Moderate to high
Water hammer Virtually eliminated Common (disc slams)
Installation orientation Horizontal or vertical (flow upward) Usually horizontal
Cracking pressure Low (0.03 MPa) Higher (0.05 – 0.1 MPa)
Space required Short face‑to‑face Longer

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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