Where should the installation of the shut-off valve be placed on a vapor meter?

The installation of the shut-off valve on the inlet side of a vapor meter is important for several reasons. By placing the valve on the inlet side, you ensure that it can effectively control the flow of vapor into the meter. This positioning enables operators to isolate the meter for maintenance or calibration without affecting the flow downstream or causing outages in the process.

Having the shut-off valve on the inlet side also serves to protect the meter from potential damage caused by back pressure that could occur if shut-off valves are placed in less optimal positions. When maintenance or adjustments are necessary, closing the valve will prevent the vapor from moving into the meter, thus ensuring safety and integrity during servicing. This positioning aligns with standard best practices for meter installations in the industry, which prioritize safety, functionality, and ease of maintenance.