I'm trying to find information on a gate valve I've used in the past. What I remember of the valve is that it had either a coarser thread.

The body must be forged, but not casting because of the weight of metal and potential defect in casting process.

Clarify "Vaccum sealing arrangement in valves". It means the valve shall seal when pipe pressure becomes lower than valve external pressure (usually athmospheric pressure).

To jerry-rig a 3-way valve to do 2-way operation? it seems to me that one would just need to disconnect the bypass leg and cap the open pipe connections.

Are rollers and scrapers used in large diameter (>12")resilient seat gate valves that are mounted horizontally?

Specifying valves for a oil centre.For lethal gas, the ASME standard simply mentions that the valve should have enhanced stem seals.

Using of trim 5 on gate vales in steam service. Is there a temperature you would recommend moving from other trims to trim 5. Is there a better trim than trim 5?

Comments or examples on practical upper limit for application of epoxid coated knife-gate valves for liquid fluids?