Raised Face or Flat face finish is possible in wafer and lug valves?

[bala0100]

Can any one advise me whether Raised Face or Flat face finish is possible in wafer and lug valves?

 

[pennpiper]

Both styles are made.
Use Google and do some research.

Sometimes its possible to do all the right things and still get bad results

 

[OSIRIS7]

If the joining flange is raiced face it does not matter. The surface outside the raised face portion can not apply pressure to the gasket and thus has no effect on the closing parameters.

Not sure it helps, but just FYI.

 

[moltenmetal]

DO NOT join a flat face flange made of cast iron to a raised face flange made of any material. Malleable/ductile iron? You might get away with it- but gray cast iron (used to make cheap components) will very likely break the first time an ambitious fitter tries to stop a leak by overtightening the flange studs...