Parker CE-B-SZ thermostatic expansion valve 1-2 ton adjustable R-404A

Parker CE-B-SZ Thermostatic Expansion Valve

This Parker CE-B-SZ thermostatic expansion valve regulates refrigerant flow in R-404A systems with a nominal capacity of 1 to 2 tons. It is designed for commercial refrigeration and air-conditioning equipment requiring precise superheat control. The externally adjustable design allows technicians to fine-tune performance across varying evaporator loads. It includes a sensing bulb mounting clamp for secure installation.

Compatibility and Installation Checks

Verify that the system uses R-404A refrigerant and operates within the 1 to 2 ton capacity range before ordering. Confirm the SAE flare angle connections match the 3/8 inch inlet and 1/2 inch outlet sizes on existing piping. Ensure the 30 inch capillary length reaches the evaporator outlet from the planned valve location. The adjustable range covers -40 to 0 degrees Fahrenheit for low-temperature applications.

Build Quality and Daily Operation

The balanced port construction maintains accuracy over wide load variations, minimising hunting, flood-back and coil starving problems. Externally adjustable stem permits superheat changes without removing the valve from the line. Brass flare connections with the 750-70 designation provide reliable sealing under vibration. The included sensing bulb clamp ensures consistent thermal contact for stable day-to-day operation.