Posted by Harold Kestenholz - Hydronic Network on January 05, 2000 at 09:38:49:
In Reply to: relief valve posted by derrick j on January 05, 2000 at 07:50:05:
The relief valve is opened frequently to flush dirt and also check that the mechanism is not frozen in place so it can do the job of safety. Dirt sometimes lodges in the seat. Further flushing may free it. If not, replacement with the same rating is necessary as you can not plug it or you will create an explosion possibility.