H20 3/2 Single Solenoid Valves - Turn-Lock Manual Override 1/4" & 3/8" Port Sizes

Product Overview

The Automatic Valve H20 3/2 Single Solenoid Valve, Turn-Lock Manual Override configuration, is a bar-stock aluminum spool valve electrically actuated through a solenoid pilot with DIN EN 175301-803 Form B coil connection. Built on the H20 2-inch bar-stock platform, it delivers 1.8 Cv (1,800 Nl/min) flow through 1/4 and 3/8 inch NPT porting for 3-way directional switching under PLC, relay, or other electrical control.

The single solenoid body uses one energized solenoid pilot opposed by an internal return spring. Energizing the coil shifts the spool against the spring; de-energizing the coil allows the spring to return the spool to its normal position. This spring-return behavior provides predictable, fail-safe default behavior on loss of electrical power.

This variant is equipped with a turn-to-lock-only manual override on the solenoid operator end cap. Rotating the override mechanism locks the spool in the actuated position independent of coil energization, providing a lockable manual actuation point without a separate push motion.

The valve retains the core mechanical construction of the H20 platform: a balanced spool for consistent, low pilot force requirements; anodized bar-stock aluminum body and hardcoat/PTFE anodized aluminum spool for corrosion resistance and long bore life; and Buna-N (nitrile) seals rated across the full -40 to 180 F (-40 to 82 C) ambient and media temperature range. Coils are available in 12 V DC, 24 V DC, 24 V AC, 120 V AC, and 240 V AC, and are certified to CSA C22.2 and UL Standard 429 for North American electrical installations.

Key Engineering Features

• Electrical Solenoid Pilot Actuation - A solenoid pilot with DIN EN 175301-803 Form B coil connection shifts the 3/2 spool on command from a PLC output, relay, or other electrical control signal, supporting integration into standard automated control architectures.
• DIN EN 175301-803 Form B Coil Connector - The standard coil termination uses the DIN EN 175301-803 Form B industrial connector, a widely supported quick-disconnect format compatible with common field-wireable mating connectors and cable assemblies.
• Balanced Spool Construction - The balanced spool design equalizes pressure across the spool land geometry, reducing solenoid pilot force requirements and supporting consistent shifting response across the full 0 to 150 psig operating range.
• Bar-Stock Aluminum Body - Machined from anodized bar-stock aluminum for a rigid, corrosion-resistant valve body suited to demanding industrial and washdown-adjacent environments.
• Nitrile Seal Package - Buna-N (nitrile rubber) seals provide reliable sealing across the -40 to 180 F (-40 to 82 C) operating temperature range on filtered air service.
• 1.8 Cv Flow Capacity - 1.8 Cv (1,800 Nl/min) flow capacity in both 1/4 inch and 3/8 inch NPT port sizes supports fast cylinder response for typical industrial actuator loads.
• Spring Return to Normal Position - An internal return spring shifts the spool back to its normal, de-energized position any time the coil loses power, providing predictable fail-safe behavior on power loss.
• Turn-Lock Manual Override - This variant includes a turn-to-lock-only manual override on the solenoid operator end cap. Rotating the override mechanism locks the spool in the actuated position independent of coil energization, providing a lockable manual actuation point without a separate push motion.
• Multiple Voltage Options - Coils are available in 12 V DC, 24 V DC, 24 V AC, 120 V AC, and 240 V AC to match the facility's control voltage without requiring a separate transformer or power supply at the valve.
• CSA / UL Certified Coil - Solenoid coil certified to CSA C22.2 and UL Standard 429 for use in North American electrical installations.
• CE, RoHS 3, and REACH Compliant - Full compliance with EU Machinery Directive, RoHS 3, and REACH requirements supports deployment on CE-marked machinery without additional regulatory review.

Technical Specifications

General Specifications

Electrical Data (Solenoid Pilot Valves)

DIN EN 175301-803 Form B coils are rated IP65 and are suitable for continuous duty. Power ratings shown are typical for standard coils; consult Automatic Valve for low-wattage coil options. All coils are specified by voltage code at time of order and are field-replaceable without removing the valve body from the pneumatic circuit.

Electrical Connection Options

Flow Performance Data

Certifications & Compliance

Typical Applications & Industries

General Industrial Automation

• Pneumatic cylinder actuation for clamping, indexing, transfer, and positioning tasks across general-purpose machine automation, where the H20 balanced spool construction and 1.8 Cv flow rating deliver consistent cylinder response across a wide range of bore sizes and stroke lengths.
• Multi-station assembly automation requiring reliable, repeatable directional switching at moderate to high cycle rates, where the bar-stock aluminum body and Buna-N seals provide long service life without excessive maintenance intervention.
• Retrofit and OEM machine builds where the H20's compact 2-inch envelope and standard NPT porting simplify integration into existing pneumatic manifolds and panel layouts.
• General shop air distribution circuits where valves must tolerate normal industrial air quality variation while maintaining consistent switching performance over the 0 to 150 psig operating range.

Automotive Manufacturing

• Body-in-white fixture clamping and locating pin actuation, where consistent spool shifting under repeated cycling supports high-throughput assembly line takt times.
• Weld cell tooling and part-present sensing circuits where the anodized aluminum body resists the particulate and thermal exposure typical of weld cell environments.
• Paint and sealer application equipment pneumatic actuator control, where dependable directional switching supports coating process consistency.
• Powertrain assembly torque tool and press-fit tooling pneumatic circuits requiring dependable, repeatable valve actuation over high daily cycle counts.

Packaging Machinery

• Case erecting, carton folding, and glue application cycle actuation where the H20's flow capacity supports rapid cylinder response at typical packaging line speeds.
• Palletizing and depalletizing end-of-arm tooling actuation for vacuum cup or gripper circuits requiring dependable directional switching.
• Stretch wrap and shrink wrap machine pneumatic clamp and cutter actuation, where consistent valve performance supports continuous production runs.
• Labeling and filling machine indexing and stop-gate actuation requiring precise, repeatable timing in the pneumatic control circuit.

Material Handling

• Conveyor diverter, stop-gate, and pop-up transfer actuation across distributed material handling systems where the H20's straightforward inline porting simplifies field wiring or piloting.
• Automated storage and retrieval system (AS/RS) shuttle and clamp actuation requiring dependable directional control integrated into centralized or distributed valve panels.
• Palletizer and depalletizer clamp, lift, and rotate function actuation in high-cycle distribution center operations.
• Sortation system gate and kicker actuation where fast, repeatable valve response is required to maintain sortation accuracy at line speed.

Machine Tool

• Coolant valve, chip conveyor, and tool-change clamp actuation on CNC machining centers, where the H20's rugged bar-stock body withstands oil mist and metal particulate common in machining environments.
• Fixture clamping and part-locating pneumatic circuits on dedicated and flexible machining systems requiring consistent, repeatable clamp force timing.
• Automatic tool changer air-blast and clamp release circuits where dependable valve switching supports unattended machining cycles.
• Way-wiper and guard actuation circuits on machine tools requiring simple, low-maintenance pneumatic control elements.

Assembly Automation

• Multi-axis pick-and-place end effector actuation where the H20 provides dependable directional switching for gripper open/close and rotate functions.
• Press-fit, staking, and riveting tooling actuation requiring precise timing coordination with upstream sensing and control logic.
• Rotary and linear indexing table clamp and lock actuation supporting synchronized multi-station assembly sequences.
• Component feeder and escapement actuation in high-mix assembly cells requiring compact, reliable valve packages.

Food and Beverage Processing

• Filling, capping, and labeling machine pneumatic actuator control in production environments subject to washdown and sanitation cycles; consult Automatic Valve regarding enclosure and coil protection options for washdown duty on solenoid variants.
• Conveyor gate, diverter, and case handling actuation in bottling and canning lines where dependable, repeatable valve switching supports continuous production.
• Portion control and dosing equipment pneumatic actuator circuits requiring precise, repeatable cycle timing.
• Packaging line clamp and seal actuation in food-grade production facilities, with attention to washdown protection ratings for any solenoid coil selected for wet-area duty.

Ordering and Model Number Configuration

Coils are specified by voltage code appended to the model number after a hyphen (for example, -DABF for 12 V DC).

Standard coil connection is DIN EN 175301-803 Form B. Specify option G for 18 inch flying leads or option C for a 1/2 inch conduit adapter in place of the DIN connector.

Port protector is not included as standard; specify suffix P if a factory-installed port protector is required.

For temperatures below 32 F (0 C), specify dried air supply to prevent internal ice formation.

Coils are field-replaceable without removing the valve body from the pneumatic circuit. Verify the voltage code on the replacement coil matches the supply voltage before installation.

The single solenoid (spring return) body returns to its normal position any time the coil is de-energized, including on power loss. Confirm this fail-safe behavior matches the application's safety requirements.

The turn-lock manual override allows the valve to be locked in the actuated position independent of coil energization by rotating the override mechanism; rotate to unlock before returning to automatic operation.

Related Products & Accessories

• Automatic Valve H20 3/2 Single Solenoid Valves - Spring Return - 3/2 single solenoid H20 valve with spring return and standard manual override. https://www.automaticvalve.com/series/4045-h20-32-single-solenoid-valves-spring-return
• Automatic Valve H20 3/2 Single Solenoid Valves - Push-Turn Lock Manual Override - 3/2 single solenoid H20 valve with push-turn lock manual override for maintenance lockout. https://www.automaticvalve.com/series/4047-h20-32-single-solenoid-valves-push-turn-lock-manual-override
• Automatic Valve H20 5/2 Single Solenoid Valves - Spring Return - 5/2 single solenoid H20 valve with spring return and standard manual override. https://www.automaticvalve.com/series/4049-h20-52-single-solenoid-valves-spring-return
• Automatic Valve H20 5/2 Single Solenoid Valves - Push-Turn Lock Manual Override - 5/2 single solenoid H20 valve with push-turn lock manual override for maintenance lockout. https://www.automaticvalve.com/series/4050-h20-52-single-solenoid-valves-push-turn-lock-manual-override
• Automatic Valve H20 5/2 Single Solenoid Valves - Turn-Lock Manual Override - 5/2 single solenoid H20 valve with turn-lock-only manual override. https://www.automaticvalve.com/series/4051-h20-52-single-solenoid-valves-turn-lock-manual-override
• Automatic Valve H20 5/2 Double Solenoid Valves - 5/2 double solenoid H20 valve with detented last-position memory and dual pressure feature standard. https://www.automaticvalve.com/series/4084-h20-52-double-solenoid-valves
• Automatic Valve H20 5/2 Double Solenoid Valves - Push-Turn Lock Manual Override - 5/2 double solenoid H20 valve with detent and push-turn lock manual override on both solenoid operators. https://www.automaticvalve.com/series/4085-h20-52-double-solenoid-valves-push-turn-lock-manual-override
• Automatic Valve H20 5/2 Double Solenoid Valves - Turn-Lock Manual Override - 5/2 double solenoid H20 valve with detent and turn-lock-only manual override on both solenoid operators. https://www.automaticvalve.com/series/4086-h20-52-double-solenoid-valves-turn-lock-manual-override
• Automatic Valve H20 3/2 Single Air Pilot Valves - Spring Return - 3/2 single air pilot H20 valve with spring return, for hazardous or electrically restricted locations. https://www.automaticvalve.com/series/4011-h20-32-single-air-pilot-valves
• Automatic Valve H20 5/2 Single Air Pilot Valves - Spring Return - 5/2 single air pilot H20 valve with spring return for double-acting actuator control without electrical supply. https://www.automaticvalve.com/series/4030-h20-52-single-air-pilot-valves
• Compact Solenoid L Series Valves - Standard Temperature Applications - Smaller-envelope L20 platform solenoid valve for applications where the compact L Series footprint is preferred over the H20 bar-stock body, including CSA/FM explosion-proof and ATEX coil options not offered on the general-purpose H20 family. https://www.automaticvalve.com/series/2979-compact-solenoid-l-series-valves-standard-temperature-applications
• Compact Air Pilot L Series Valves - Standard Temperature - Smaller-envelope L20 platform air pilot valve for hazardous-location or electrically isolated circuits where the compact L Series footprint is preferred over the H20 bar-stock body. https://www.automaticvalve.com/series/2995-compact-air-pilot-l-series-valves-standard-temperature

Frequently Asked Questions (FAQ)

Q: What coil connection does the H20 solenoid valve use?

A: The standard coil connection is the DIN EN 175301-803 Form B industrial connector, rated IP65. Option G provides 18 inch flying leads and option C provides a 1/2 inch conduit adapter in place of the DIN connector.

Q: What voltage options are available?

A: Coils are available in 12 V DC (voltage code DABF), 24 V DC (DAAF), 24 V AC (DAEF), 120 V AC (DACF), and 240 V AC (DAFF).

Q: What flow capacity does the H20 solenoid valve provide?

A: The H20 solenoid valve provides 1.8 Cv (1,800 Nl/min) flow capacity in both 1/4 inch and 3/8 inch NPT port sizes.

Q: What is the operating temperature range?

A: The H20 solenoid valve operates from -40 to 180 F (-40 to 82 C) for both ambient and media temperature. For operation below 32 F (0 C), the air supply must be free of water vapor to prevent ice formation inside the valve.

Q: What body and seal materials are used?

A: The H20 solenoid valve body is anodized bar-stock aluminum, the spool is hardcoat/PTFE anodized aluminum, and the seals are Buna-N (nitrile rubber).

Q: Is the coil certified for use in North America?

A: Yes. The solenoid coil is certified to CSA C22.2 and UL Standard 429 for solenoid valves used in North American electrical installations.

Q: Can the coil be replaced without removing the valve from the pneumatic circuit?

A: Yes. The coil is field-replaceable without disconnecting the valve body from the pneumatic piping. Verify the replacement coil's voltage code matches the supply voltage before installation.

Q: Is a port protector included standard?

A: No. Port protector is not included as standard on the H20 solenoid valve. Specify the port protector option (suffix P) at time of order if required.

Q: Is lubrication required for the H20 solenoid valve?

A: Lubrication is not required. The valve is designed for reliable operation on filtered air without supplemental air line lubrication.

Q: What is the typical lead time for H20 solenoid valves?

A: Standard manufacturing lead times for quantities of 10 or fewer units are typically 3 to 4 weeks, with shipping available throughout the United States.

Q: How does the turn-lock manual override work?

A: Rotate the override mechanism on the solenoid operator end cap to lock the spool in the actuated position independent of coil energization, without a separate push motion.

Q: How do I release the turn-lock manual override?

A: Rotate the override mechanism in the opposite direction to unlock it, allowing the spool to return to normal operation once unlocked.

Q: How does turn-lock differ from push-turn lock override?

A: The turn-lock override is engaged and released purely by rotation, without a separate push step. The push-turn lock override requires the operator to press the pin before rotating to engage the lock.

Q: What happens to the single solenoid valve if electrical power is lost?

A: The internal return spring shifts the spool to its normal, de-energized position any time the coil loses power, providing predictable fail-safe behavior.

Installation & Maintenance Guidelines

• Supply filtered air to the H20 valve inlet port. No specific filtration micron rating is mandated for the H20 family beyond keeping the air supply free of liquid water and bulk contaminants; use a standard industrial air line filter appropriate to the installation's air quality.
• For operation at temperatures below 32 F (0 C), the air supply must be free of water vapor to prevent formation of ice inside the valve body and spool bore. Use a refrigerated or desiccant air dryer upstream of the valve for any application where ambient or media temperature may fall below freezing.
• Mount the valve in any orientation. The inline 1/4 inch and 3/8 inch NPT ports accept standard pipe fittings or push-in adapters; ensure adequate clearance around the operator end for actuation and, on manual and solenoid variants, for manual override access.
• Wire the solenoid coil per the DIN EN 175301-803 Form B connector pin assignment. Verify supply voltage matches the coil's voltage code before energizing.
• Provide overcurrent protection sized to the coil's rated current draw per the facility's electrical code requirements.
• Do not exceed the 0 to 150 psig (0 to 10.3 bar) operating pressure rating. Verify upstream regulator setpoints before commissioning.
• Do not restrict the exhaust port beyond the requirements of the application circuit. Restricted exhaust flow increases cycle time and can cause elevated internal temperatures during high-cycle operation.
• Inspect the valve periodically for external air leakage at port connections and at the actuator cap seal. Nitrile (Buna-N) seals are standard; verify seal material compatibility if the application introduces any lubricant, cleaning agent, or process media exposure beyond filtered air.
• Because the single solenoid body returns to its normal position any time the coil is de-energized, verify that this fail-safe default position is correct for the connected actuator and circuit before commissioning.
• Confirm the turn-lock manual override is in the unlocked position before returning the valve to automatic electrical control after maintenance or manual operation.

Warranty & Global Support

Automatic Valve, a ROSS Controls company, provides a standard warranty on all products covering defects in material and workmanship from date of purchase.

Technical support and product configuration assistance are available through Automatic Valve at (248) 474-6761.

For complete technical data, dimensional drawings, CAD models, and ordering configuration, visit automaticvalve.com or contact the factory directly.

Estimated ship dates are based on standard manufacturing times for quantities of 10 or fewer. Shipments are available throughout the United States.

Valve Installation and Service User Manual: https://www.automaticvalve.com/documents/424

Solenoid Coils, Electrical Connectors, and Exhaust Silencers Catalog: https://www.automaticvalve.com/documents/868/solenoid-coils-and-connectors-exhaust-silencers