Diversitech TXVHE-404A-507-4S Txv R-404A R-507

Product Description

The DIVERSITECH TXVHE-404A-507-4S is a thermostatic expansion valve (TXV) designed to regulate refrigerant flow into the evaporator and maintain precise superheat control at the evaporator outlet. Compatible with R-404A and R-507 refrigerants, this valve features a 0.38 inch SAE inlet connection, a 0.5 inch connection, and a 0.25 inch ODF outlet. It is installed by licensed HVAC-R technicians as part of a direct-expansion refrigeration or cooling system where accurate superheat control is critical to system efficiency and compressor protection.

This TXV is suited for commercial refrigeration and air conditioning applications running R-404A or R-507 refrigerant. Typical installations include walk-in coolers, reach-in cases, condensing units, and other direct-expansion evaporator systems where refrigerant mass flow must be matched to the load. The valve modulates flow based on the pressure and temperature signal from the sensing bulb mounted at the evaporator outlet, keeping superheat within the target range across varying load conditions.

Key Features

• Regulates refrigerant flow rate into the evaporator for stable system operation
• Controls superheat at the evaporator outlet to protect the compressor from liquid slugging
• Compatible with R-404A and R-507 refrigerant systems
• 0.38 inch SAE inlet connection for straightforward field installation
• 0.25 inch ODF outlet connection for standard copper line sets

Compatibility

Designed for use in direct-expansion refrigeration and cooling systems charged with R-404A or R-507 refrigerant. Consult system manufacturer documentation to confirm valve capacity and superheat settings match the specific evaporator and compressor application.

Installation Notes

Installation should be performed by a licensed HVAC-R technician following applicable industry codes and refrigerant handling regulations. Recover all system refrigerant and isolate the system before removing the existing valve or making any connections. Mount the sensing bulb securely to the suction line at the evaporator outlet and insulate it from ambient air to ensure accurate superheat readings. After installation, leak-test all connections before recharging and verify superheat setpoint under normal operating conditions.