125# FF ductile iron valve with 150# RF Cast steel flanges
125# FF ductile iron valve with 150# RF Cast steel flanges
(OP)
We have to replace 125# FF ductile iron valves ( material - A536 65-45-12 & A126 GrB ) with the existing 150# RF valves. The flange on the water filter where the valve is installed is #150 RF. There is spacer installed at present between the valve and the vessel flange.
Is it possible to fabricate a spacer flange from 150# Blind flange so that the RF of the bling flange mates with the vessel and the FF of the blind flange mates with the 125# FF flange of the valve. By using a full face gasket will a leak proof joint will be ensured?
Also any tips on gasket material selection would be greatly appriciated.
Thanks in advance.
Is it possible to fabricate a spacer flange from 150# Blind flange so that the RF of the bling flange mates with the vessel and the FF of the blind flange mates with the 125# FF flange of the valve. By using a full face gasket will a leak proof joint will be ensured?
Also any tips on gasket material selection would be greatly appriciated.
Thanks in advance.





RE: 125# FF ductile iron valve with 150# RF Cast steel flanges
RE: 125# FF ductile iron valve with 150# RF Cast steel flanges
Have you used any such spacer sucessfully or this is a suggession ( I think it is sensible ).
By inserting this steel blind flange spacer what will be its effect on the torque requirement on the bolts and leak tightness of the joint.
The service is water at noirmal temp and 60 psig pressure
RE: 125# FF ductile iron valve with 150# RF Cast steel flanges
If you decide to go with the steel blind flange spacer, it would be the same as using a spectacle blind, and the bolt up should be no different than normal. Care should be taken when bolting a RF flange to a FF flange when the RF flange is cast. If not done properly (spoke pattern), it could leak, and if over tightened the RF cast flange could crack. Check the manufacturers specs.