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AbTehnic Profesional

Check valves

Check valves

straight or angle
from DN 10 up to DN 250
(stainless steel range from DN 10 up to DN 25)



Check valves

RFF Check valves may be supplied with a material certificate for the body and the bonnet which guarantees impact strength at -50°C.

Check valves sizes 10 to 40 mm and 125 to 250 mm are sealed by PTFE, and check valves sizes 50 to 100 mm are sealed by an O-ring.

The size of a check valve on an installation should be carefully chosen :

The check valve should not be oversized or it may start to “chatter” when operating.

To size the by-pass valve, the seat diameter must be at least 10 % of the diameter of the large valve being by-passed. For such applications the large isolating valves should be installed upside down.

Branch connections

  • for butt welding, “S” class (ASTM pipe schedule standard)
  • for butt welding, “M” class (Din 2448)
  • for brazing, “B” class
  • for socket welding, “K” class. (angle weld instead of full penetration weld).

Check valves are supplied painted in blue to indicate the no-return function. From outside it looks like a filter but there is no groove above the bonnet

  • This range of valves have the same design as the steel range except :
  • Available from DN 10 up to DN 25.
  • Stainless steel shell in X4CrNi 18-10 (1.4301) EN10088-3.
  • Connection : thickness 2 mm for stainless steel pipe, “H” class.