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.
90 % - engineering time on compressor selection - line components get 10 %
Compressor selection eats 90 % of the engineering time on a typical refrigeration project. Line components eat 10 %, and almost all of the in-service failures.
800+ - solenoid valve models - across all brands
Solenoid valves: Castel, Danfoss EVR, Sanhua, Parker Sporlan, with 800+ models across all brands.
862 - Castel models ingested - across 6 component types
We ingested Castel's full XLSX catalog into DigiEntropy in May 2026 with 862 models across 6 component types.
10:1 - EXV turndown - a TXV manages 3:1
Capacity range: narrow (3:1 turndown) for a TXV, wide (10:1 turndown) for an EXV.
80 % - of filter driers drop out on R744 - the high-pressure compatibility filter
Filter drier search filtered to R744: the high-pressure compatibility filter drops 80 % of the catalog.
3 min - per component in the worked example - once you know the filters
Total time: 3 minutes per component once you know the filters.
What's in the catalog
Typical catalog entries per component type
Typical entries (at least): Solenoid valves 800+, Filter driers 400+, TXVs 350+, Ball valves 250+, Check valves 180+, Sight glasses 120+, EXVs 60+.
Each entry carries refrigerant compatibility, capacity at rated conditions, MOPD, connection size and, where the vendor publishes it, datasheet links.
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