By installing two relief valves in sequence, you add back pressure above the first relief valve piston, causing a change in the pressure setting. For example, the estimated relieving pressure of a ...

Record-dry parts of southern Australia could see “significant drought relief” from Friday as a low-pressure system and cold front moves across South Australia and the southern Northern Territory.

Reversing valves can be difficult to remove because they have four solder joints to deal with at the same time and, to make matters worse, they are very heat sensitive.

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