Voltage and power
The voltage with its kind: DC direct, AC alternating, with a frequency of 50, 60 or 50/60 Hz. A replacement must match in both voltage and kind. Power is printed in watts (W) or volt-amperes (VA).
Reference tool — not a selection
Read a solenoid valve coil before it goes in an RFQ.
Coil and EN 175301-803 plug
Voltage, duty, connector form.
Type the label as it reads on the coil. A measured spacing between contacts 1 and 2, or a form button, redraws the plug to scale. Below the examples, an offered coil can be checked against it: the voltage, ED, power, insulation class and connector.
Examples:
Replacement check
On the labels alone: whether a coil fits the valve’s armature tube is the valve maker’s to say.
All 130 engineering tools
Solenoid valves for starting air, fuel, separators and boilers carry a label on the coil: 24 V DC, 8 W, ED 100 %, insulation class F, IP65. The coil’s connector is a plug to EN 175301-803 (formerly DIN 43650), and its form follows from the spacing between contacts 1 and 2. Type the label or measure the spacing, and the reader names the voltage, the duty, the insulation class, the connector form and the valve function (2/2 NC, 3/2 NO), draws the plug to scale, checks an offered coil and writes an RFQ line.
Whether a coil fits the armature tube of a given valve is not read here: the valve maker decides it by the coil part number.
How a coil is read
Voltage, ED, connector.
ED and insulation class
ED is the share of time energised: 100 % is continuous operation, less needs rest periods. The insulation class to IEC 60085 is the winding’s thermal rating: B 130 °C, F 155 °C, H 180 °C.
Connector form
A plug to EN 175301-803 (formerly DIN 43650): form A has 18 mm between contacts 1 and 2, form B 10 mm, the industry standard form B 11 mm and form C 8 mm. The third contact is the earth.
| Form | Spacing 1–2 | Standard |
|---|---|---|
| Form A | 18 mm | EN 175301-803 |
| Industry standard form B | 11 mm | industry standard |
| Form B | 10 mm | EN 175301-803 |
| Form C | 8 mm | EN 175301-803 |
A 9.4 mm spacing is left out: one source calls it the industry standard form C, another form B. The plug housing sizes and cable gland threads differ by maker and are left out too.
Sources
Form A 18 mm: Emerson’s ASCO connector catalogue and HTM Sensors; form B 10 mm: HTM Sensors, a Phoenix Contact “valve connector B (10 mm)” cable and Hirschmann’s valve connector overview; industry standard form B 11 mm: the ASCO catalogue and Festo’s MSSD catalogue; form C 8 mm: HTM Sensors and Hydraulic Megastore. ED: the German Wikipedia (“Einschaltdauer”), Festo coil data sheets and Ledex solenoid tables. Insulation classes: Wikipedia and CMC’s table, as in the motor nameplate reader. Valve function (ways and positions, NC and NO): Elesa’s directional control valve notes and Wikipedia’s solenoid valve article; port numbers and ISO 1219 symbols are left out.
Before you send the request
Questions about valve coils in an RFQ
What does ED 100 % mean on a coil?
ED is the duty: the share of time the coil may stay energised. A coil marked ED 100 % may stay energised continuously; a lower ED needs rest periods, so it does not replace a 100 % coil on a valve held open or closed for long.
How is the connector form found?
Measure between the centres of contacts 1 and 2 on the coil: 18 mm is form A, 10 mm form B, 11 mm the industry standard form B and 8 mm form C to EN 175301-803 (formerly DIN 43650). The 10 and 11 mm forms do not fit each other, so measure to a tenth of a millimetre.
Can a coil with another voltage replace it?
No. The coil must match the supply in voltage and in AC or DC; an AC coil also carries its frequency (50, 60 or 50/60 Hz). The reader marks another voltage as not meeting.
What should the request include?
The coil label in full (voltage, AC or DC and frequency, power, ED, insulation class), the connector form or the measured spacing, the valve maker and type, the coil part number if printed, the quantity, and a photograph of the coil on the valve.
Coil read?
Send the line with a photograph of the coil.
A decoded label is a cross-check, not a coil selection. Attach photographs of the label and the plug, and Vessel Core checks them before an offer goes back.
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