Large valve rubber lining considerations?
Large valve rubber lining considerations?
(OP)
I am going to specify Cast Iron butterfly valves (4"-84") on a SS316L piping. In order to avoid galvanic corrosion I have specified all valves to be rubber lined on interior surfaces and flange faces with Neoprene to a thickness of 1/8".
1)Are there any potential problems in rubber lining a flange face?
2)Is it practical to rubber line a 84" buttefly valve body?
Thanks
1)Are there any potential problems in rubber lining a flange face?
2)Is it practical to rubber line a 84" buttefly valve body?
Thanks





RE: Large valve rubber lining considerations?
Third-party linings are usually bonded. Manufactured Lined butterfly valves usually have liners that are replaceable. The valve liners are regular consumable service items.
Frequently I see stainless valves used in rubber-lined pipe. This is the first time I have seen someone wanting to rubber line valves in stainless pipe.
RE: Large valve rubber lining considerations?
I know that in joining SS to CI, the valve (CI) will corrode more seriously, since it makes the anode. But how serious the corrosion will be and how fast it will progress is not known.
Majid Javaheri
Hazen and Sawyer, P.C.
www.hazenandsawyer.com
RE: Large valve rubber lining considerations?
Hydrae
RE: Large valve rubber lining considerations?
1)Do you have any information on the bonding method, procedure that is preferable?
2)Can I still consider an individual resilient seat for the valve as the maintenance part in order to avoid lining damage by opening/closing of the valve?
RE: Large valve rubber lining considerations?
I do not have the details on the manufactoring methods just certain brands (I do not remember which brands) purchased 20 to 30 years ago. The fix is to always refill the line through valves other than older butterflys. Current AWWA valve typically do not have this problem.
Hydrae
RE: Large valve rubber lining considerations?
We manufacture rubber lined butterfly valves with fiberglass composite housings, so your galvanic corrosion problems become a mute point.
good luck;
Joe
www.pureflex.com
RE: Large valve rubber lining considerations?
Actually joining a cast iron valve to a stainless steel pipe does not make a serious senario of galvanic corrosion but in order to make some cheap preventing measures, it is worth to electrically insulate the flanges in a joint. This could be done by using full face rubber gaskets, thermoplastic bolt sleeves and dielectric washers under the bolt heads. No electric current across the joint at which nonsimilar materials are present means protection against galvanic corrosion.