Pneumatic Solenoid Valve 3V210-08-NC (DC24V) — XCPC, 200 Series

Operating principle of a monostable NC valve:

1. With the coil de-energized, the return spring holds the spool in the closed position — the air supply port (P) is blocked, and the working port (A) is connected to atmosphere through the exhaust port (R).
2. When voltage is applied to the solenoid (DC 24V), the armature is pulled in, the spool shifts, and opens the P → A passage — compressed air reaches the actuator (for example, filling a single-acting cylinder).
3. When voltage is removed, the spring returns the spool to its initial position in roughly 0.05 seconds; port A is reconnected to atmosphere via R, and the connected cylinder returns to its initial position under its own spring force.

This scheme (NC, with spring return) is the standard, most widely used solution for controlling single pneumatic cylinders and pilot lines, where the system must remain in a safe “zero” state whenever power is removed.

Technical Specifications

Design Features

Decoding the designation 3V210-08-NC-DC24V:

Key design solutions:

• Housing with polyoxymethylene (POM) components — reduces the spool’s friction coefficient, which, combined with NBR seals, extends the valve’s service life 1.5–2x compared to standard market equivalents.
• Spool made of 6061 aluminum alloy, CNC-machined — ensures precise geometry of the sealing surfaces and a minimal response time (0.05 sec).
• Increased effective flow area for the size class — the G 1/4″ ports on the “08” model deliver a 16 mm² flow area, providing fast filling of actuator working chambers despite the compact 200 series footprint.
• Low solenoid power consumption (2.5 W) — minimizes coil heating when multiple valves are mounted closely together in a single control manifold.

Installation Recommendations

• Always install a silencer on the exhaust port R — the G 1/4″ thread accepts a standard S-type or B-type silencer; this protects the valve’s internal parts from dust ingress through the open port and reduces noise on actuation.
• Meet the air purity requirement — filtration to 40 μm — dirtier air accelerates wear on the spool and NBR seals, even with the low-friction POM construction.
• Verify coil voltage and tolerance when ordering — this model is DC 24V ±10%; XCPC also produces DC 12V coils, as well as AC 24/110/220/380V (50/60 Hz) for the same housing series — when matching to a specific controller (PLC, relay), confirm the required variant in advance, since AC and DC coils are not interchangeable.
• Account for the IP65 protection class when choosing a mounting location — the valve is protected against dust and water jets, but wiring connections must be made in a way that preserves this protection class (sealed cable glands, connectors).
• Do not exceed the 1.2 MPa maximum pressure or the 0.15–0.8 MPa working range — operating outside this range shortens seal life and can cause incomplete spool switching.
• Lubrication is not required thanks to the POM construction, but under demanding conditions (high cycling, elevated temperature) seal life can be extended by using ISO VG32 turbine oil in the air line.

Analogues and Comparison

Functional equivalents to the 3V210-08 (3/2, NC, G1/4″, solenoid-operated) from other manufacturers:

Before substituting an equivalent from another brand, verify the effective flow area, response time, and protection class — even with similar port markings, these parameters can differ.

3V210-08 (3/2) vs 4V210-08 (5/2) — don’t mix them up when ordering:

Common Ordering and Installation Mistakes

• Ordering a 3/2 valve for a double-acting cylinder — a double-acting cylinder requires a 5/2 valve (e.g., from the 4V series), not a 3/2; confusion over the series designation is a common cause of incorrect orders.
• No silencer on port R — an open exhaust port without a silencer accelerates contamination of the valve’s internal parts with dust from the atmosphere and raises the noise level on the shop floor.
• Ordering a coil without checking the current type — DC and AC coils are not constructionally interchangeable; if mixed up, the coil won’t work correctly with the existing controller.
• Ignoring the air filtration requirement (40 μm) — supplying unfiltered air sharply reduces the service life of the spool and seals, negating the durability benefit promised by the POM/NBR construction.
• Installing in a hazardous (explosive) area with a standard coil — such conditions require ordering a special explosion-proof coil execution, available separately for DC12V, DC24V, AC110V, and AC220V.
• Exceeding the maximum cycle frequency (above 5 cycles/sec) — causes solenoid overheating and accelerated spool wear.

Application Areas

The 3V210-08-NC model is used in the following industries:

• Packaging machinery — controlling cutoff and feed mechanisms running on spring-return cylinders
• Woodworking — sending pilot signals to high-capacity valves in dust extraction systems
• Food industry — controlling shutoff pneumatic valves and product blow-off systems
• Automated warehouses — driving pushers in compact sorting lines

Expert Opinion

Vitali Boluchevski, Lead Engineer, Acvatron SRL, 18 years of experience:

“Over more than 30 years on the market, XCPC has grown from a local manufacturer into a supplier with a production culture on par with European standards, and the 3V210-08 model demonstrates that well. It combines the compactness of the 200 series with an effective flow area typical of larger valves — which keeps this valve from becoming a bottleneck in fast pneumatic circuits. From practical experience: this valve genuinely holds up under intensive use, provided one condition is met — air purity at the 40-micron level specified by the manufacturer. If that requirement is neglected, the spool’s service life drops several times faster than the POM/NBR construction promises. On acvatron.md we recommend this valve as the optimal solution for high-cycling systems with single-acting cylinders — with a silencer mandatory on the exhaust port and a fine filter installed ahead of the valve.”

FAQ

What is the difference between the 3V210-08 and the 4V210-08? The 3V series has 3 ports and 2 positions (3/2) and controls single-acting cylinders. The 4V series has 5 ports (5/2) and is designed to control double-acting cylinders, where forced air supply is needed in both directions.

Can this valve be used without lubricated air? Yes, the valve’s construction with internal POM components allows operation on dry (unlubricated) air. Under demanding conditions, using ISO VG32 turbine oil can extend seal life.

How should the exhaust be connected on this model? Port R is the exhaust port. It’s strongly recommended to fit a silencer (S-type or B-type) with a G 1/4″ thread, to protect the valve’s internal parts from dust and reduce noise levels.

What does the “NC” in the model designation mean? NC (Normally Closed) means that with the coil de-energized, the valve sits in the closed position: air supply to the working port is blocked, and the working port itself is connected to atmosphere. This is the standard configuration for a safe “zero” system state when power is cut.

What other coil voltage options are available for this series? Besides DC 24V (this model), XCPC produces DC 12V coils, as well as AC 24V/110V/220V/380V (50/60 Hz) for the same 3V/4V housing lineup. The allowed voltage deviation is ±10% of nominal, the protection class is IP65, and the insulation class is F. Separate explosion-proof coils are available for hazardous areas.