The HW18 pressure switches are used to regulate the tank pressure between two preset values on 3 phase electrically driven air compressors.They are availble with an unloader valve,which prevents compressors fromtarting under load,and it is available with an On-Off knob for manual cut off the compressor

TheHW19 pressure switches are used to regulate the tank pressure between two preset values on electrically driven air compressors. They are available with an unloader valve, which prevents compressors from starting under load and it is available with an On-Off knob for manual cut off the compressor

HW20 pressure switches are used to regulate tank pressure between two preset values on small electrically drivenair compressors. Equipped with an unloader valve,they could prevent compressors from starting under load.Theauto -off disconnect lever for manual cut off the comressor. Both one and four-ports manifold style are availble whichprovides easy mounting of valves and gauges.