The 034G1721 ETS 25B is a high-precision electronic thermostatic expansion valve (TXV) designed for Danfoss HVAC and refrigeration systems. It features a sight glass for visual refrigerant monitoring, supports bi-flow operation, and accommodates refrigerants such as R134a, R410A, R404A, R407C, and others.
With inlet and outlet 7/8" ODF solder connections, this valve delivers up to 131 kW (37.9 TR on R410A) of cooling capacity. It operates at ambient temperatures from –40 °C to +60 °C, withstands maximum pressures up to 660 psig (45.5 bar), and is UL-approved.
Equipped with a bi-polar stepper motor offering 2,625 full steps and M12 4-pin IP67 electrical connection, the ETS 25B ensures precise superheat control. It’s fully serviceable with available spare parts (including sight glass), making it a reliable, long-term choice for commercial and industrial cooling systems
| Inlet and Outlet Connection Size | 7/8" ODF |
|---|---|
| Cooling Capacity | 131 kW |
| Ambient Temperature Range | –40 °C to +60 °C |
| Maximum Pressure | 660 psig (45.5 bar) |
| Enclosure Rating | IP67 |
| Flow Direction | Bi-flow |
| Motor Type | Bi-polar |
| Step Mode | 2-phase full step |
| Total Steps | 2625 (full steps) |
| Approval | UL-listed and CE-marked |
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Danfoss 034G1721 Electronic Thermostatic Expansion Valve Installation Guide
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