OPERATION AND MAINTENANCE MANUAL
09-2015
4
2.2 MATERIALS
The table below lists the structural materials of the check ball valves.
Ite
m
Part designation
Material
Reference standard
1
Body
Spheroidal cast iron
EN-GJS-400-15
PN-EN 1563: 2012
2
Cover
Spheroidal cast iron
EN-GJS-400-15
PN-EN 1563: 2012
3
Rubber-embedded ball
Cast iron or aluminium alloy
in rubber coating: NBR (or EPDM)
PN-EN 1563: 2012
PN-EN 1706: 2010
PN-ISO 1629: 2005
4
Valve cover gasket
Rubber: NBR (or EPDM)
PN-ISO 1629: 2005
5
Bolt, cap,
hex
Acc. to reference standards
PN-EN ISO 4762: 2006
6
Bolt plug
Paraffin
acc. to manufacturer's Technical
Guidelines
