Actuation for directional control valves
Solenoid Coils and Connector Sockets for Directional Control Valves
The solenoid coil is the first component to be replaced on an electrically actuated directional control valve — usually without having to replace the valve itself. Three specifications are decisive: the voltage (24 V DC and 230 V AC/50 Hz are common), the required degree of protection and the connector form of the connector socket to DIN EN 175301-803, formerly DIN 43650. Here you will find the selection logic and can go straight to the matching ranges — each including the associated connector sockets.
Voltage, degree of protection, connector form
Why STASTO
Solenoid coil, connector and matching from a single source
Replacement coil or complete control unit: we cleanly match voltage, connector form and design to your valve — for maintenance, purchasing and plant engineering.
Voltage variants for common controls
The series are available in several voltage ratings, including 24 V DC and 230 V/50 Hz; further voltages depending on series and variant. You can see the specific selection in the respective product category.
Connector shape and plug from a single source
Coil and matching connector come from the same range — including versions with built-in LED and varistor for suppression of voltage spikes, where available for the respective series.
Spare part instead of a new valve
If a coil fails, the valve stays in the system. You replace only the actuating part and keep the port pattern, piping and mounting dimensions.
Technical clarification before you order
You give us the valve type, voltage and connector shape — we check the match against the datasheet. If the nameplate markings are unclear, a photo of the nameplate is enough.
Guide
The right solenoid coil in three steps
Voltage, connector type and installation conditions determine the selection. The points below summarize what matters when choosing a coil and valve connector.
Step 1: Voltage and current type
- 24 V DC
- Common low voltage for PLC control; the coil must match the control system, not the process.
- 230 V / 50 Hz
- Classic mains voltage version; further voltage ratings are available depending on the series.
- Check the rating plate
- The voltage and frequency are printed on the old coil. Using an AC coil on DC (or vice versa) leads to malfunction or failure.
- Coding in the part number
- The voltage rating is encoded in the part numbers of the pneumatic coil series. Useful as a guide — the specification in the datasheet or on the article itself is always binding.
Step 2: Connector type and standard
- DIN EN 175301-803
- Current standard for solenoid valve connectors (valve plugs); defines contact spacing and size of forms A, B and C.
- DIN 43650 (legacy standard)
- Former designation that existing customers often still use: 43650A corresponds to form A, 43650C corresponds to form C.
- Form A
- Most widely used design with a larger housing, typical for solenoid valves and larger coils.
- Not compatible
- Forms A, B and C are not plug-compatible with one another. The form is determined by the coil, not by the cable.
Step 3: Degree of protection, additional functions, valve connection
- Degree of protection
- What IP rating is required at the installation site? The value for each coil and connector is stated on the respective variant.
- LED and varistor
- LED for status indication, varistor for suppression of voltage spikes — both can be combined in one connector, depending on the version.
- Connector width on the valve
- For the pneumatic series, the connector width differs (e.g. 16 mm for Series K, 22 mm for Series E+V) — it also determines which coil can be mounted mechanically.
- Special case: hazardous areas (ATEX)
- For explosive atmosphere zones, the selection is limited to approved versions — please coordinate in advance.
Connector types
Form A, Form B and Form C compared
The three connector forms according to DIN EN 175301-803 differ in contact spacing and size. They are not interchangeable with one another.
| Form A | Form B | Form C | |
|---|---|---|---|
| Size | largest design | medium design | smallest design |
| Contact spacing | large contact spacing | smaller contact spacing | smallest contact spacing |
| Typical use | Solenoid valves and larger coils | Medium-size coils | Compact coils |
| Former designation | DIN 43650 Form A (43650A) | DIN 43650 Form B | DIN 43650 Form C (43650C) |
| Plug compatibility | not compatible with B or C | not compatible with A or C | not compatible with A or B |
| Selection determined by | the solenoid coil | the solenoid coil | the solenoid coil |
Product ranges
Solenoid coils and connector plugs in the shop
Straight to the right categories: coils for pneumatic directional control valves, valve connectors, and coils for solenoid valves in liquid and gas applications.
Applications
When you need a solenoid coil and valve connector
Solenoid coils and valve connectors are wear and adaptation parts — the need typically arises in these situations.
Maintenance and fault rectification
The valve no longer switches, but it is mechanically intact. Replace the coil with one of identical voltage and connector type and the system keeps running.
Changing the control voltage
When changing from 230 V AC to 24 V DC — for example when upgrading to a PLC low-voltage control system — the valve stays in place and only the solenoid coil is replaced.
Damp and washdown environments
In areas with water spray or regular cleaning, the tightness of the plug connection is critical. The achievable degree of protection depends on the coil, the connector and the correct seating of the gasket — we state the values for each specific variant.
Interference suppression and signal monitoring
Connectors with LED show the switching state directly at the valve; varistor versions limit switch-off voltage spikes to protect the control electronics.
Valve manifolds and process plants
With several identical valves, a standardised coil and connector configuration pays off — it reduces the number of spare-part variants held in stock.
NAMUR mounting on rotary actuators
Actuation of butterfly valves and ball valves via NAMUR directional control valves; the coil and connector are part of the mounting configuration.
Procurement
Availability, reorders and blanket order call-offs
We state stock and lead time per variant, depending on the series and version.
Availability per variant
Whether a voltage or connector variant is available at short notice depends on the respective series. We will give you the current status on request, or you can find it on the respective product page.
Replacement parts for existing systems
For valves from current series, the replacement coil can usually be matched unambiguously. For older or modified valves, we check the assignment individually.
Additional demand and blanket orders
For recurring requirements of standard coils and connector plugs, we coordinate call-off quantities and availability on a project basis.
Valve and coil sets
Valves are configured partly with and partly without a connector plug. When ordering, pay attention to the "with"/"without connector plug" designation — if needed, we will complete the set.
How it works
From enquiry to a specific article recommendation
Three steps are all we need to match the right solenoid coil or connector unambiguously.
Gather the details
Note the valve type, control voltage and connector shape — or simply take a photo of the nameplate.
Verify the match
We compare your details against the datasheet and check the design, connector width and voltage range.
Receive a product recommendation
You receive a specific product recommendation, including availability information for the respective variant.
Frequently asked questions
Solenoid coil and valve connector — answered briefly
Answers on coil replacement, connector forms, standards and additional functions.
Can I replace just the solenoid coil, or do I need a new valve?
In most cases, replacing the coil is enough. The coil sits on the valve as a separate component and can be changed without touching the piping. The prerequisite is that voltage, connector form and design are identical. The valve is only replaced if the valve mechanism itself is damaged.
What do "Form A", "Form B" and "Form C" mean?
These are the three connector forms of valve connectors (plug connectors) according to DIN EN 175301-803. They differ in contact spacing and size and are not interchangeable. Form A is the largest and most widely used, Form C the smallest.
Is DIN 43650 the same as DIN EN 175301-803?
DIN 43650 is the former designation; the currently valid standard is DIN EN 175301-803. In practice you will come across both notations: "43650A" corresponds to Form A, "43650C" corresponds to Form C. When selecting, you can go by the designation you are familiar with.
Which voltages are available?
24 V DC and 230 V/50 Hz are standard; further voltage ratings are available depending on the series. You can see the variants actually available in the respective product category, or ask us.
What are the LED and varistor in the valve connector for?
The LED indicates whether the coil is energized — helpful for troubleshooting directly at the machine. The varistor limits voltage spikes when the inductive load is switched off, thereby protecting switching contacts and the controller's output modules.
Are there coils for hazardous (explosive) areas?
The range of solenoid valves for liquids and gases includes a coil series in ATEX design (II 2G Ex mb IIC T4 / II 2D Ex mb tb IIIC T130 °C). We clarify, based on the datasheet and before you order, whether it suits your valve and your zone classification.
What degree of protection does the coil–connector socket connection achieve?
That depends on the selected coil, the connector socket and the correct installation of the gasket and cable entry. We will give you the value for your specific variant; for damp or frequently cleaned environments we recommend a dedicated review.
Will a coil from your range fit my existing valve from another manufacturer?
Not as a blanket rule — what matters is the design, connector width and armature diameter. Send us the valve type and the nameplate data; we will check the match and tell you clearly whether a replacement coil fits.
Matching valves
Valve series for your coil selection
Are you looking not only for the solenoid coil but also for the matching valve? These series can be configured with solenoid coils and connector sockets.
Next step
Find the right solenoid coil or connector
Tell us the valve type, control voltage and connector form — or simply send a photo of the nameplate. We check the match against the datasheet and get back to you with a specific article proposal including availability. Technical advice from STASTO Automation — for maintenance, purchasing and plant engineering.