Medium

Heating water quality according to ÖNORM H5195 or VDI-Standard 2035. The use of ethylene or propylene glycol in 

a mixing ratio 25- 50% is allowed. Please refer to manufacturers documentation when using ethylene glycol products 

for frost and corrosion protection. Please note that EPDM gaskets will be affected by Mineral oils lubricants and thus 

lead to failure of the EPDM seals in the valves that use EPDM seals. HERZ ball valve for heating and chilled water 

is not suitable for usage of agressive medium (such as: acids, alkalis, combustible and explosive gases) because it 

can destroy sealing components.

Field of application

The ball valve is used with or without an actuator in heating and cooling systems for infinitely variable control for the 

supply of cold and hot water or air in closed circulation circuits. Herz ball valve with characteristic DZR is made of 

CW602N; this material has the properties of dezincification-resistant brass. The spindle of the valve can easily be 

connected to the actuator. The synchronization characteristic of the ball made of forged brass is integrated on the 

valve. The sealing of the ball is ensured by the PTFE sleeve in the housing. These O-rings allow the ball and both 

sleeves a small axial movement, which enables a high level of tightness and low torques. The tightness of the spindle 

is guaranteed by 2 O-rings.