Butterfly check valves with counterweight and oil cylinder flanged PN 25

Valvotubi butterfly check valve PN 25 art.5026
Article: 5026
Flanges: UNI EN 1092-2 PN 25
Face to face length: EN 558-1, serie 14. DIN 3202 F4
Installation: horizontal / vertical with down-up flow direction.
APPLICATIONS ° Water supply ° Drinking water ° Irrigation plants ° Reservoirs ° Dams ° Pumping stations
Epoxy paiting suitable for drinking water applications.

- Fig. 5026A: #150 FF

The butterfly check valves with counterweight and oil cylinder are very reliable as they can regulate the closing time of the valve itself. These valves are applied in pipelines as non-return device, with flow allowed in one direction only. The butterfly check valves with counterweight are double eccentric type with tilting disc, the counterweight lever will facilitate the anti-hammer device and the oil cylinder will slow down the closure movement, to reduce any slam with noise. From DN 900 and up, they come with two counterweight levers and two oil cylinders, one on each side of the valve. Epoxy coated inside and outside, the double flanged butterfly valves can be installed in drinking water plants. NBR gasket seals are on the disc and can be replaced without dismantling the valves from the pipeline.

 

Materials
body - disc ductile iron GGG50, EN-GJS-500
disc seat ring  NBR + stainless steel 304
O ring  NBR
counterweight and lever  steel + iron
cylinder  steel
hinge pins  stainless steel X 20 CR 13
painting  epoxy 250 mcr min.
DN L mm. D mm. Weight kg.
 200  230  360  71
 250  250  425  96
 300  270  485  106
 350  290  555  146
 400  310  620  196.5
 450  330  670  210
 500  350  730  310
 600  390  845  360
 700  430  960  520
 800  470  1085  650
 900  510  1185  910
 1000  550  1320  1200
 1200  630  1530  2000
 1400  710  1755  3210
 1600  790  1975  5302
 1800  870  2195  7700
DN Nominal pressure Test pressure Mpa Max working pressure Mpa
mm BAR body seat 80°C
200-1800 25 3,75 2,75 2,5