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4 INCH GG20 BS21 PN16 cast iron foot valve factory
BS21 is the specification for pipe threads for tubes and fittings according to British standard.
4 INCH GG20 BS21 PN16 cast iron foot valve Standard:
1.Production Size:4''
2.Pressure range:PN16
3.Design Standard:BS21
4.Screw Standard:BS21
5.Testing Standard:ISO 5208
4 INCH GG20 BS21 PN16 cast iron foot valve main material of parts:
1.Body:GG20
2.Filter:GG20
3.Disc:GG20/Carbon Steel
4.Seat:NBR,EPDM
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