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You are right. These are the seat inserts in ball valves and I want to see the difference between them. Rgds Marcell

Gents, I am in Australia and the valves suppliers here use James Walker O-Rings. In order to increase the resistance of an o-ring against methanol (which cause O-ring swells or volume increase) you need to increase fluorine content of the O-ring which this has an adverse effect on low temp...

People, Do you know where I can read more about peek, ptfe and rptfe, devlon which are used in the valve industry? Also, do you know if Methanol is compatible with viton seals? Regards, Marcell

People, We have a methanol injection line to the wellheads. This is very unlikely to be used but the potential is there. I don't know the concentration of Methanol if it is going to be used and as a result, viton seals are not good enough where the media has methanol concentration. Do you know...

Hi there, I want to know where I can find more information regarding PEEK, PTFE, RPTFE. Rgds Marcell

Guys, Thanks for your supports. Please note this DB&B is going to isolate a flowline from the plant inlet and must be piggable. So, I think the option of using gate valve drops out (except WKM Gate valve). Another option is to use a ball valve with proper trunion mounted ball and trim...

Thanks Guys, Dcasto, Please note the company is not prepared to pay for a WKM gate as the price is 3 times more than a ball. I have seen ball valves as DBB in many gas plants and refineries and am going to convince them using ball valves. Any suggestions, please let me know! Rgds Marcell

I agree Dcasto regarding perfectness of WKM Gates; but cost is an issue. That's why I want to use a Ball valve!

Jt, Why gate valves and not ball valves?

Hi People, Please could you let me know your opinions or experience on the following task? I want to install a 12" class 600 Double Block and Bleed system on a natural gas pipeline at the plant inlet. This line is going to be commissioned in 10 months. I want to know what valves type to use as...

thread408-94849 Refered to the above thread, the gentleman has mentioned using gate valves as isolation valves in DB&B configuration; however I do not agree with him entirely on that. I prefer using Ball Valves. What do you think? Your feedbacks are welcome! Rgds Marcell

I agree with Asherang entirely on that! JWTweed, I believe you are intend to install the valve you are after upstream of an instrument devise; e.g PT,PIT! Is this right? If so, have you tried Swagelok? Rgds, Marcell