TRV flow direction can be rest to overcome water hammer and noise
A new TRV from Danfoss overcomes problems associated with being installed the wrong way round by being able to change the direction of flow around the flow-control cone. This capability can be used to overcome problems such as system noise or water hammer cause by chattering valves.
Traditional cone-and-seat valves need to be fitted in the flow to a radiator rather than in the return to prevent hammer when a partially open valve is forced to slam shut by water flowing the wrong way through the valve — resulting in a costly call back.
The Danfoss flow-selectable bi-directional TRV can be installed horizontally or vertically in the flow or return. Any noise that might occur after fitting can be stopped by changing the patented flow-direction selector on the valve head from the factory-set position to the alternative setting.