Minn. R. agency 151, ch. 5225, BOILER SAFETY, pt. 5225.5000
The feed-pipe must be provided with a check valve near the boiler and a valve or cock between the check valve and the boiler. When two or more boilers are fed from a common source, there must be a globe or regulating valve on the branch to each boiler between the check valve and the source of supply. Wherever globe valves are used on feed piping, the inlet must be under the disk.
A combination stop-and-check valve in which there is only one seat and disk, and a valve stem is provided to close the valve when the stem is screwed down, must be considered only as a stop valve, and a check valve must be installed as provided in the first paragraph of this part.
Minn. R. agency 151, ch. 5225, BOILER SAFETY, pt. 5225.5000
Statutory Authority: MS s 175.171; 183.42; 183.44; 183.465; 183.466; 183.54; 326B.958; 326B.964; 326B.966; 326B.982