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For Tripple Offset Butterfly valves in sizes from 24" and above which is more preferred wafer lugged or flanged ends?

Can anybody please clarify "Vaccum sealing arrangement in valves".

Recently I came across a requirement where the customer wanted complaince to NACE MR0103.What is the main difference between NCE MR 0175 and MR 0103. Is the key difference there in the environmental conditions under which sulphide stress cracking occurs?

Can Anyone tell me as to What is the main functional difference between a pneumatic diaphragm actuator & a pneumatic piston actuator while operatin a globe valve.Will it be difficult to attain the precise control with piston actuator?

Can anybody explain me the main disadvantage of tilting Disc Check valve over a swing Check valve?

Recently I got an enquiry where I came across two different services of valves Underground service and Buried service.Are these two services different? I feel that both are the same. Please clarify.

As per Shell requirement what is the main difference between FE class A and Class B production testing.Is there any difference in the testing procedure or only in the leakage rates. Can anybody help me out?