Recent content by yarmouthmatt

I asked ChevronTexaco about quarter turn valves and they seemed less concerned about them for 2 reasons. - 1. They have far fewer in service and 2. they do tend to not leak as much. I would think however that ball and butterfly valves will need to be tested in the near future. Are you a ball...

Our laboratory does not require that you send the valves already flanged and we have not had flange leak problems.

There will be a Valve World show in November with an emphasis on fugitive emissions and the numerous standards that are currently published and being developed. Yarmouth Research and ChevronTexaco will be presenting information about a test program that has been recently conducted on gate valves.

There is a significant difference in test pressures for Class 600 and below. For API 607, the test pressure is 30 psig and for 6FA, it is 75% of the CWP. The lower test pressure of 607 makes it more difficult for some ball valves to seal for through leakage, but easier for the stem packing and...