Introduction to SORIT Valves

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Photo Courtesy of Parker / Sporlan

There are many brands and styles of Evaporator Pressure Regulating valves (EPR), but none as common as the Parker / Sporlan SORIT and ORIT valves.

The diagram above  clearly shows some of the common applications. An EPR or “hold back” valve maintains a set suction line pressure and therefore coil temperature. This is critical in situations where multiple evaporators of different design temperatures connect back to a shared suction header as is common in grocery store refrigeration.

The EPR valve “holds back” pressure in the evaporator to a set pressure so long as there is a pressure differential between the evaporator coil and the shared suction header. The suction header must have a LOWER pressure than the lowest design pressure of any evaporator connected to it.

A SORIT valve is an EPR valve or ORIT (Open on Rise of Inlet Pressure) valve that also includes a solenoid stop.  The purpose of the solenoid stop is to
prevent the defrost gas from entering the suction line and overheating/overloading the compressors when the defrost solenoid opens and back feeds the evaporator to defrost.

For a full and detailed explanation of ORIT and SORIT valves, you can read BULLETIN 90-20 from Parker Sporlan.

— Bryan


One comment

  1. Avatar C.S.Nair says:

    Can u say about ADP (apparatus dew point)

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