Coil Operating Temperature
Solenoids will get very hot from normal usage. The high temperature limit of a coil is defined by either the insulation type on the internal wiring or the limits of the onboard circuitry. If the temperature on either of these limiting components is exceeded, permanent and self-perpetuating damage will result.
The chart below gives guidelines for allowable temperature for the limiting component of a solenoid. These are not the fluid temperature limits. For very hot applications, the solenoid is not directly mounted to the valve body. This greatly reduces thermal conduction. See our ER Series.
|Solenoid||Valves where used||Insulation Class||Temperature Limit|
|Catalog Type||EH30, 40, & 50; EX30 & 40||F||310 (wire)|
|Catalog Type||EH30, 40, & 50; EX30 & 40||H||350 (wire)|
|200 Series||EH70||-||392-464 (wire)|
|300 Series||EH70||-||392-464 (wire)|
|400 Series||Type ER & EV||-||185 (circuit)|
|800 Series||Type ER & EV||-||185 (circuit)|
As solenoid coil wire heats up, electrical resistance goes up and less current flows. Since pull force of a solenoid is directly proportional to amperage, a solenoid operating at its upper temperature limit may produce a slower valve actuation speed.