Which company could provide the differential pressure switch in water flow application

 

Ashcroft makes a nice, comprehensive line of reasonably priced temperature & pressure switches:

"http://www.dresserinstruments.com/productnav/switchprodnav.html":http://www.dresserinstruments.com/productnav/switchprodnav.html

Regards,

Brandon Nichols, PE

 

ITT Barton is one of the best, i always myself prefer it over Winter's and others

 

Here is one type of pressure switch link - not sure if would meet your application however.
"http://www.almegcontrols.com/mechanical_pressure_switch_for_industrial_or_marine_use.htm":http://www.almegcontrols.com/mechanical_pressure_switch_for_industrial_or_marine_use.htm

Thanks Bob Hogg