Enquiry specification
GESTRA DISCO non-return valve
RK 41
DN:
Valve seat: metal-to-metal / EPDM / FPM
Wafer-type non-return valve for sandwiching between
flanges PN 6/10/16, Class 125
Short overall length to EN 558, series 49
DN 15-100 (½-4”):
Body with spiral centring ring for horizontal and vertical
pipes.
Spring: 1.4571, opening pressure: 5 mbar for
downward flow, specially designed spring retainer ensures
centric spring support.
DN 125-200 (5-8”):
Self-centring body thanks to an adapted diameter for
horizontal and vertical pipes.
Spring: 1.4571, opening pressure: 10 mbar for
downward flow.
Eyebolts simplify installation, centric cone and spring guides
unaffected by dirt.
Pressure drop chart. The curves in the chart are valid for water at 20°C. To read
the pressure drop for other fluids, calculate the equivalent
water volume flowrate V˙w.
Pressure drops in the chart apply to valves with standard
spring for use in horizontal pipes and to valves without spring
for use in vertical pipes with upward flow.
