Butterfly check valves with counterweight and oil cylinder flanged PN 16

Valvotubi butterfly check valve counterweight art.5016
Article: 5017
Flanges: UNI EN 1092-2 PN 16
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.

The butterfly check valves with counterweight and oil cylinder are very reliable as they regulate the closing time of the valve. 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  340  71
 250  250  405  96
 300  270  460  106
 350  290  520  146
 400  310  580  196.5
 450  330  640  210
 500  350  715  310
 600  390  840  360
 700  430  910  520
 800  470  1025  650
 900  510  1125  910
 1000  550  1255  1200
 1200  630  1485  2000
 1400  710  1685  3210
 1600  790  1930  4820
 1800  870  2130  7000
DN Nominal pressure Test pressure Mpa Max working pressure Mpa
mm BAR body seat 80°C
200-1800 16 2,4 1,76 1,6