Hand adjust NHK
NHK handwheel is used to control valves for heating and cooling manually in eg radiator systems, cooling systems and towel dryers.
The handwheel is used to manually control flow. They can also be used for shutdown. Valves used in a VVC system should not be switched off because of legionic bacteria. To avoid this, one is supplemented with a washer that is inserted between the valve and the handwheel. Handwheel NHK is nickel-plated, and is controlled with a hexagonal wrench (5 mm) so that unauthorized persons cannot change the setting.