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LIAG Non Return Valves

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Download NRV Datasheet for DIN & SMS

Download NRV Datasheet for Inch

Non Return Valves

Fields of applications

LIAG®non-return valves (check valves) reliably prevent products from flowing back into pipes. Non-return valves of the 61A, 62A and 63A series are provided with a 4-way controlled metallic disk seal which reliably prevent the so-called flutter effect up to an operating pressure of 20 bars (290 psi). The disk seal of the 62B series is in metal, that of the 62C series in Teflon. LIAG®non-return valves have CIP capability, feature a compact design and can be taken apart in a single step.


  • Minimum flow resistance – pressure drop
  • Hydrodynamic inner casing
  • CIP-capability
  • Compact design
  • Taken apart in a single step
  • Robust and high reliability

Technical Data Overview

Nominal sizes:
DIN DN25 - DN80 / SMS DN25 - DN76 / 1" - 4"
All stainless steel parts:
O-ring seals:
AISI 316L (1.4404)
EPDM, FPM (Viton®)

In contact with product:


Ra ≤ 0,8 µm (Ra ≤ 32µin)


Operating temperature:

110°C (230°F)
140°C (284°F)

Operating pressure:20 bar max. (290 psi max.)
Opening pressure:

DN25 / 1
DN40 / 38 / 1,5
DN50 / 51 / 2
DN65 / 63 / 2,5
DN80 / 76 / 3

0,18bar (2,6psi)
0,12bar (1,7psi)
0,08bar (1,2psi)
0,06bar (0,9psi)
0,05bar (0,7psi)

Valve connection:
Welded ends / Male ends:DIN11850 / DIN1185
Male ends:DIN11851, SMS1145
TC:Tri-Clamp (Inch)
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