Direct Acting Solenoid Valves
DELCO Direct Acting Solenoid Valves are designed to operate from 0 bar pressure. Unlike pilot valves, these zero-differential units do not require line pressure to open, making them ideal for gravity feed systems, vacuum applications, and low-pressure loops.
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Direkt wirkendes Magnetventil: True Zero-Differential Pressure & Millisecond Switching
Engineered for closed-loop fluid systems, atmospheric gravity draining, vacuum lines, and automated sampling skids where line pressure is negligible or fluctuating, the Delco direct-acting Magnetventil series provides immediate, positive fluid shutoff. Unlike pilot-operated designs that require line backpressure, the electromagnetic coil directly lifts the magnetic armature off the valve seat orifice. This delivers true zero-differential (ΔP = 0 bar) opening reliability, lightning-fast 10-to-20-millisecond cycle speeds, and zero susceptibility to clogged pilot holes across forged brass and stainless steel bodies.
Technische Vorzüge: Direct Plunger Actuation Engineering
Direct magnetic connection opens the seal without needing upstream line pressure. Functions reliably in rough vacuum systems, low-pressure gas, and gravity-fed tanks.
Low-mass stainless armatures execute full travel in 10 to 20 milliseconds, delivering superior volumetric dosing repeatability in high-speed bottling and analytical machinery.
Free of microscopic pilot bypass bleed holes, direct-acting valves tolerate light particulate loads and slightly viscous fluids without the pilot-hole sticking common in pilot valves.
Precision CNC-ground valve seats and resilient elastomer seals ensure zero-bubble shutoff from negative vacuum pressures down to 1.3 × 10-2 Pa up to 16 bar.
Epoxy-encapsulated Class H (180°C) or Class F (155°C) copper coils endure non-stop, 24/7 energization in enclosed control cabinets without thermal drop-out or coil burnout.
Available in 2-way on/off as well as 3-way universal configurations (Normalerweise geschlossen, Normalerweise offen, oder Diverting) to suit complex OEM instrument manifolds.
Technische Spezifikationsmatrix
| Parameter | 2-Way NC Forged Brass | 2-Way NC 316 Stainless | 3-Way Universal Class | High-Pressure Micro-Orifice |
|---|---|---|---|---|
| Nominale Größenspanne | DN1.5 – DN10 (1/8" – 3/8") | DN1.5 – DN15 (1/8" – 1/2") | DN1.0 – DN6.0 (1/8" – 1/4") | DN0.8 – DN3.0 (1/8" – 1/4") |
| Betriebsdruck | 0 – 1.6 MPa (Null ΔP erforderlich) | 0 – 1.6 MPa (0 – 16 Bar) | 0 – 1.0 Mpa (0 – 10 Bar) | 0 – 5.0 Mpa (Bis zu 50 Bar) |
| Karosseriematerial | Schmiedemessing CW617N / HPb59-1 | ASTM A351 CF8M / 316 SS | Forged Brass / 316 SS | Forged AISI 316L Stainless Steel |
| Seal Materials | NBR (Norm), FKM, EPDM | FKM (Viton), PTFE, EPDM | NBR, FKM, PTFE | PEEK, PCTFE, Synthetic Ruby |
| Betriebstemperaturbereich | -10°C bis 90°C (NBR) / 130°C (FKM) | -20°C bis 150°C (FKM/PTFE) | -10°C bis 120°C | -30°C bis 150°C |
| Switching Response Time | 12 – 25 ms | 15 – 25 ms | 10 – 20 ms | 8 – 15 ms |
| Endverbindungen | Female G Thread (ISO 228-1), Frauen-NPT (ASME B1.20.1), Sub-base / Manifold Mount | |||
| Coil Specifications | 12VDC, 24VDC, 24VAC, 110VAC, 220VAC (50/60 Hz); IP65 DIN 43650 Form A/B/C; Klasse F (155°C) / Klasse H (180°C); 100% ED | |||
Häufig gestellte Fragen: Direct Acting Solenoid Valves
Frage 1: Why is a Direct-Acting Solenoid Valve mandatory for gravity feed and vacuum lines?
Pilot-operated valves rely on upstream line pressure to push open the main diaphragm or piston. If line pressure is zero or negative (such as an atmospheric gravity draining tank or vacuum degassing chamber), there is insufficient hydraulic energy to lift the seal, causing the valve to remain stuck closed. Direct-acting valves use purely magnetic pull to lift the seal, operating independently of line pressure.
F2: What is the relationship between orifice size and operating pressure in direct-acting valves?
In direct-acting valves, the magnetic coil must overcome the product of line pressure and orifice area (Force = Pressure × Area). Daher, maximum operating pressure is inversely proportional to orifice diameter. For small orifices (1.0–2.5 mm), the valve can easily hold 1.6 to 5.0 Mpa. For larger orifices (6.0–10.0 Mm), operating pressure is typically limited to 0.4–0.7 MPa unless a high-power boost coil is fitted.
F3: What is the functional difference between 2-way and 3-way direct acting solenoid valves?
Ein 2-Wege-Ventil has one inlet and one outlet, functioning as a straightforward on/off shutoff control. Ein 3-Wege-Ventil features three pipe ports and two internal seats. Depending on port connection, it can serve as Normally Closed (exhausting an actuator cylinder when de-energized), Normalerweise offen, Umleitung (routing one inlet to two alternate outlets), or Mixing (blending two inlets into one common outlet).
Frage 4: How does Delco prevent coil overheating during 100% continuous duty cycles?
Continuous energization can elevate coil temperature and cause insulation breakdown. Delco employs Class H (180°C) and Class F (155°C) enameled copper wire encapsulated in thermosetting epoxy. This provides rapid heat dissipation to the ambient air and prevents moisture absorption, ensuring that steady-state operating temperatures remain well below thermal breakdown limits.
Direkte Fabriklieferung: Precision Direct-Acting Solenoid Valves
High-volume inventory of forged brass and 316 stainless steel direct-acting solenoid valves. 100 % Werksdrucktests, EN 12266-1 Rate A zero-bubble certified, and ready for rapid OEM equipment integration.