Line components — the EXV, solenoid, sight glass, drier picker
By DigiEntropy Engineering · 2026-02-14 · 6 min read
Line components rarely get attention in compressor-focused tools. Wrong size or wrong refrigerant compatibility quietly kills systems in the field. DigiEntropy's Line Components page centralises them across Castel, Danfoss, Sanhua, and others.
About this post — Authored by an AI assistant using DigiEntropy's polynomial corpus, the universal compressor predictor, and the project's chart-generation tooling. Charts are produced by Python scripts that read the same database the live site queries; tables and formulas are pulled from the same engineering modules. Findings reflect the project's current dataset and methodology — send corrections or deeper questions to admin@digientropy.com. Compressor selection eats 90 % of the engineering time on a typical refrigeration project. Line components — EXV, TXV, solenoid valve, sight glass, filter drier, ball valve, check valve — eat 10 %, and almost all of the in-service failures. The failure modes are predictable: - EXV undersized for the capacity range — full-open at full load + still starving the evaporator. - Solenoid valve rated MOPD lower than the actual operating ΔP — coil burns out within months. - Filter drier sized for line capacity but not for the moisture load of a long pipe run. - Sight glass rated for one refrigerant family used on another with incompatible elastomers. The Line Components page puts the cross-brand catalog behind one search interface so the right part is one filter away. What's in the catalog Component Vendors Typical entries --------- Solenoid valves Castel, Danfoss EVR, Sanhua, Parker Sporlan 800+ models across all brands Ball valves Castel, Sanhua, Honeywell 250+ Check valves Castel, Henry, Parker 180+ Sight glasses Castel, Danfoss, Sanhua 120+ Filter driers Castel, Danfoss DML/DCL, Sanhua 400+ EXVs (electronic expansion valves) Danfoss ETS, Sanhua DPF 60+ TXVs (thermostatic expansion valves) Danfoss TES/TGE/TUA, Sanhua, Sporlan, Honeywell 350+ Each entry carries refrigerant compatibility, capacity at rated conditions, MOPD, connection size (ODF / NPT / flange), and (where the vendor publishes it) datasheet links. EXV vs TXV — when each wins TXV (thermostatic) EXV (electronic) --------- Cost Cheap (€30-€80) Expensive (€200-€500 + driver + sensor) Tuning Mechanical, set once at commissioning Software, adapts to operating point Capacity range Narrow (3:1 turndown) Wide (10:1 turndown) Best for Fixed-load systems with stable operating points VFD compressors, variable load, transcritical CO2 Failure mode Stiction over time, especially in dirty refrigerant Sensor or driver electronics fail; valve itself rarely does Most cold rooms can still use a TXV with no downside. Heat pumps, VFD-driven systems, and any transcritical R744 system should be EXV. MOPD — the silent killer of solenoid valves MOPD = Maximum Operating Pressure…