Compact Solenoid L Series Valves - High Temperature Applications 0 to 180 F (-18 to 82 C)

Product Overview

The Automatic Valve Compact Solenoid L Series - High Temperature is the elevated ambient temperature configuration of the proven L20 platform, designed for pneumatic directional control applications where ambient conditions reach 180 F (82 C). By specifying the high-temperature CT conduit coil (Option CT), the operating range extends to 0 to 180 F (-18 to 82 C), making this series appropriate for metal processing, oven-adjacent automation, thermoforming, and other industrial environments that exceed the capability of standard coil assemblies.

Built on the same compact, balanced spool architecture as the full L Series family, the High Temperature variant retains all standard mechanical features including the Tapered Tee-Seal self-cleaning spool seal, full-pressure solenoid pilot from port 1 (35 to 150 psig), field-convertible external pilot supply, and Push Non-Locking Manual Override as standard. Port sizes cover 1/4 and 3/8 inch in the L20 inline and L21 manifold bodies, and 1/2 inch in the L45 body, all providing 1.8 Cv at 1/4 and 3/8 inch and 4.0 Cv at 1/2 inch.

The weather-proof NEMA 4X hermetically sealed coil provides protection against moisture and contamination at all temperature levels. The high-temperature CT conduit coil variant uses a 1/2 inch conduit entry with 30 inch leads and is specifically rated for sustained exposure to ambient temperatures up to 82 C. This coil option is critical in applications where standard DIN Form B coils would experience insulation degradation or coil failure from prolonged heat exposure.

The L Series High Temperature valves carry the same certifications as the standard temperature family: CSA, FM, ATEX, and CE, with explosion-proof and intrinsically-safe coil variants available for hazardous high-temperature locations. The Tee-Seal design has been validated to 20 million cycles under SAE rust and water injection testing, providing the documented durability necessary for continuous, high-cycle production environments.

Key Engineering Features

• High-Temperature CT Coil Option to 180 F (82 C) - The high-temperature conduit coil (Option CT) is specifically rated for continuous ambient exposure to 82 C (180 F), enabling reliable solenoid operation adjacent to ovens, furnaces, heated dies, and high-temperature process equipment.
• Balanced Spool Construction with Tapered Tee-Seal - The bidirectional tee-shaped spool seal flexes to wipe sediment from the bore on every stroke, eliminating sticking from contamination or heat-induced particulate deposits common in high-temperature environments.
• 20-Million-Cycle SAE Durability - Proven reliable per SAE specifications with rust and water injection every 864,000 cycles through 20 million cycles, establishing a documented service life baseline for high-cycle production planning.
• Full-Pressure Solenoid Pilot - Three-way solenoid pilot uses full air line pressure at port 1 (35 to 150 psig) to shift the valve, maintaining positive actuation force regardless of coil temperature or viscosity changes in the pilot air circuit.
• Field-Convertible External Pilot Supply - Internal pilot supply converts to external in the field by rotating the gasket 180 degrees, supporting installations where port 1 inlet pressure may fluctuate below the 35 psig minimum in heated process environments.
• Weather-Proof NEMA 4X Hermetically Sealed Coil - The standard coil is hermetically sealed as an integral watertight unit rated NEMA 4X. The CT conduit coil extends this protection to 82 C continuous ambient temperature with 1/2 inch conduit wiring entry.
• Manual Override Standard - Push Non-Locking Override is standard on all solenoid models. Extended Turn and Turn-Locking override options are available for applications requiring the valve to remain in the actuated state during electrical outages in heated zones.
• Compact Inline and Manifold Mount Configurations - L20 inline and L21 top-mount manifold bodies enable installation in tight machine envelopes adjacent to heated tooling or processing equipment without requiring additional panel space.
• Ports Configurable for 2-Way or Speed Control - Balanced spool allows ports to be plugged for 2-way function or restricted for exhaust speed control, reducing the total valve count in high-temperature machine circuits.
• CE, CSA, FM, and ATEX Certified - Full certification coverage across North American and European regulatory requirements for industrial machinery, including explosion-proof options for high-temperature hazardous locations.

Technical Specifications

General Specifications

Temperature Ratings

The high-temperature application rating is achieved exclusively through the CT conduit coil option. The valve body, spool, and Buna-N seals remain rated to standard temperature limits. The CT coil's insulation system is designed for continuous exposure at elevated ambient temperatures. For media or ambient temperatures beyond 180 F, consult Automatic Valve factory engineering.

Electrical Data (Solenoid Pilot Valves)

The CT high-temperature conduit coil is the key selection for high-temperature applications. Standard coil voltages and enclosures remain available. All coils are rated 100% continuous duty. Coils are ordered separately and specified by voltage code.

Electrical Connection Options

Flow Performance Data

Certifications & Compliance

Typical Applications & Industries

Metal Processing and Heat Treatment

• Hot forming, forging press controls, and induction heating line actuator circuits where machine ambient temperatures regularly reach or exceed standard coil limits. The CT high-temperature coil sustains reliable solenoid operation at 82 C continuous ambient.
• Annealing furnace loading and unloading system actuators, where conveyor and transfer system pneumatic cylinders operate in close proximity to furnace openings radiating sustained heat.
• Heat treat quench system cylinder control and hydraulic valve pilots for equipment in close proximity to quench tanks and heat treatment chambers with elevated local ambient temperatures.
• Extrusion press tooling controls and billet transfer automation where metal handling equipment generates significant radiant and convective heat in the surrounding machine bay.

Plastics Processing and Thermoforming

• Thermoforming machine mold clamping and part ejection actuator circuits operating adjacent to heated platens and infrared heating elements that elevate local ambient temperatures above standard coil limits.
• Injection molding machine auxiliary circuit controls for core pulls, ejector systems, and mold temperature regulation in presses where barrel and nozzle heating raises the machine-level ambient.
• Plastic extrusion line downstream equipment, including haul-offs, cutters, and coilers, where process heating of the extrudate raises ambient temperatures in the line enclosure.
• Blow molding machine parison transfer and mold actuation in close proximity to heated parison heads and blow mold platens in continuous production operation.

Automotive Paint and Surface Treatment Lines

• Paint cure oven conveyor and transfer system actuator control where body parts transported through oven zones expose nearby pneumatic controls to sustained elevated ambient temperatures.
• Surface pretreatment and phosphate line actuators in enclosed tunnels where chemical bath heating and steam cleaning elevate the ambient beyond standard coil operating limits.
• Robotic welding and automated body shop tooling adjacent to welding heat zones where weld gun actuation and fixture clamping pneumatics must perform reliably in high-ambient environments.
• Powder coat cure oven exit transfer conveyor actuators where parts discharged from high-temperature cure ovens create localized elevated ambient conditions around automation equipment.

Food Processing and Baking Equipment

• Commercial baking and proofing oven conveyor and pusher system actuator control where the oven interior and immediate exterior ambient temperature can reach or approach the CT coil rating.
• Cooking and frying equipment transfer system pneumatic controls where elevated ambient from oil heating, steam, and cooking processes requires coils rated beyond standard temperature limits.
• Pasteurization system actuators and control valves where elevated process temperatures and steam in the surrounding environment create ambient conditions exceeding standard coil specifications.
• Dryer and dehydrator system loading and unloading automation where dryer exhaust and radiant heat from heated drying surfaces elevate local ambient conditions.

Glass and Ceramics Manufacturing

• Glass annealing lehr conveyor and pusher system pneumatic controls where the lehr exterior and adjacent handling equipment experience sustained ambient temperatures requiring high-temperature coil ratings.
• Ceramic kiln loading and unloading automation where kiln proximity generates significant radiant heat in the immediate area around transfer equipment and actuator controls.
• Flat glass tempering line actuators for plate glass handling, loading, and quench system control in facilities where tempering furnace radiant heat affects nearby machine-level ambient temperature.
• Refractory and ceramic product forming press actuators where heated dies and press platens create elevated local ambient environments around pneumatic control components.

Printing and Converting Equipment

• Web dryer and curing oven actuator controls in printing lines where UV, IR, or gas-fired dryers elevate ambient temperatures in the dryer section beyond standard coil limits.
• Hot melt adhesive application system actuators and control valves where heated adhesive tanks, hoses, and applicator heads create localized high-ambient zones in the machine enclosure.
• Heat sealing and laminating press actuators where heated seal bars and platens raise machine-level ambient temperatures above the standard coil operating range.
• Film stretching and orientation machinery controls adjacent to heated draw zones where process heating of polymer film generates elevated ambient conditions.

Ordering and Model Number Configuration

To specify high-temperature coil operation to 180 F (82 C), append suffix CT to the model number (e.g., L2003GAWR-AACT). The CT suffix selects the high-temperature conduit coil with 1/2 inch conduit entry and 30 inch leads.

Standard DIN Form B coil (no suffix) is rated to 50 C (123 F) maximum ambient. Do not use standard coils in locations where sustained ambient temperatures exceed this limit.

For G (BSPP) threads on all ports, add suffix W.

For external pilot supply, add suffix B. Field conversion by rotating the internal gasket is also available.

Fluoroelastomer seals (Option A) are available for lockout models only and do not extend the temperature rating of the coil or valve body.

Coils are ordered separately from the valve body; specify both the valve model and the coil part number with voltage code.

Related Products & Accessories

• Compact Solenoid L Series - Standard Temperature Applications - L Series solenoid spool valves for standard temperature applications, -20 to 123 F (-29 to 50 C). https://www.automaticvalve.com/series/2979-compact-solenoid-l-series-valves-standard-temperature-applications
• Compact Solenoid L Series - Low Temperature Applications - L Series solenoid spool valves rated -40 to 123 F (-40 to 50 C) for cold storage and arctic applications. https://www.automaticvalve.com/series/2978-compact-solenoid-l-series-valves-low-temperature-applications
• Compact Air Pilot L Series - Standard Temperature - L Series 3-way spool valves with pneumatic pilot actuation, no electrical supply required. https://www.automaticvalve.com/series/2995-compact-air-pilot-l-series-valves-standard-temperature
• Compact Solenoid L Series - CSA/FM Explosion-Proof, Standard Temperature - L Series with CSA and FM explosion-proof coils for hazardous location applications. https://www.automaticvalve.com/series/2980-compact-solenoid-l-series-valves-csafm-standard-temperature-applications

Frequently Asked Questions (FAQ)

Q: What makes the High Temperature L Series different from the standard temperature version?

A: The key difference is the CT conduit coil option (Option CT). The valve body, spool, seals, and mechanical design are identical to the standard temperature L Series. The CT coil uses high-temperature insulation rated for continuous exposure to 82 C (180 F) ambient, compared to 50 C (123 F) for the standard coil. The CT coil uses 1/2 inch conduit wiring entry rather than a DIN Form B connector.

Q: What is the maximum ambient temperature for the High Temperature L Series?

A: The maximum continuous ambient temperature is 180 F (82 C) when the CT high-temperature conduit coil (Option CT) is specified. Standard coils are rated to 123 F (50 C) maximum ambient.

Q: Does the high temperature rating change the valve body specification?

A: No. The valve body, spool, Buna-N seals, and all mechanical components retain the same specifications and temperature ratings as the standard L Series. The elevated ambient temperature capability is a function of the CT coil's insulation rating only. For applications where the media temperature also exceeds standard limits, consult the factory.

Q: Can I use the CT coil with any L20 or L45 valve body?

A: Yes. The CT high-temperature coil option is compatible with any standard L20 and L45 solenoid valve body in the 3-way NC or NO configuration. Append the CT suffix to the voltage code in the model number. For example, L2003GAWR-AACT specifies the high-temperature conduit coil with 120 V AC power.

Q: What wiring connection does the CT coil use?

A: The CT high-temperature coil uses a 1/2 inch conduit entry with 30 inch leads. It does not use a DIN EN 175301-803 Form B plug connector. This design eliminates the connector as a potential failure point in high-ambient environments and allows conduit wiring for code-compliant installations.

Q: What is the operating pressure range?

A: The operating pressure range is 35 to 150 psig (2.4 to 10.3 bar) at port 1 for internal pilot supply. For external pilot supply, the pilot pressure must also be 35 to 150 psig. This range is unchanged between standard and high-temperature configurations.

Q: Are explosion-proof coil options available for high-temperature hazardous locations?

A: Yes. Explosion-proof coils (Option Y for CSA/FM, Option Z for ATEX) are available and can be combined with the L20 or L45 valve body. Consult Automatic Valve for the correct combination of explosion-proof and high-temperature ratings for your specific hazardous location classification.

Q: What is the flow capacity of the High Temperature L Series?

A: Flow capacity is 1.8 Cv (1,800 Nl/min) for L20 bodies in 1/4 and 3/8 inch port sizes, and 4.0 Cv (3,940 Nl/min) for the L45 body in 1/2 inch. These ratings are identical to the standard temperature L Series.

Q: Is the manual override usable in high-temperature environments?

A: Yes. The Push Non-Locking Manual Override is standard and remains functional at elevated temperatures. For applications requiring the valve to stay manually actuated during electrical outages in heated zones, specify the Turn-Locking Override (Option 1 or 2).

Q: How does the Tee-Seal perform in high-temperature applications?

A: The Buna-N Tee-Seal maintains its sealing and self-cleaning function across the full operating temperature range of the valve body. Its mechanically locked design prevents extrusion or spiral twist, and the active spool-wiping action continues to remove contaminants at elevated temperatures. For applications where seal material compatibility with specific media or extreme temperatures is a concern, consult the factory.

Q: What filtration is required for the high-temperature configuration?

A: The same filtration requirement applies: 50 microns or better. In high-temperature environments, ensure that the compressed air supply system, including filters, is rated for the service temperature and that the filter housing is not located in the high-ambient zone unless specifically rated for it.

Q: What is the typical lead time for High Temperature L Series 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.

Installation & Maintenance Guidelines

• Verify that the CT high-temperature conduit coil (Option CT) is specified for any installation where sustained ambient temperature exceeds 50 C (123 F). Standard DIN Form B coils are rated to 50 C maximum ambient only.
• Orient the valve in any direction, but ensure the solenoid cap and conduit entry are positioned for safe coil access and conduit routing away from direct heat radiation sources.
• Supply filtered air at 50 microns or better. In high-temperature environments, ensure the compressed air supply is routed away from heat sources before entering the valve to prevent thermal expansion effects in the pilot circuit.
• For temperatures below 40 F (4 C) at system startup, air supply must be dried to prevent ice formation. In high-temperature environments, verify that the compressor after-cooler and air dryer maintain adequate dew point margin.
• For external pilot supply conversion, rotate the gasket 180 degrees and connect the external pilot to the 1/8 NPTF port on the solenoid cap. Torque M3 screws to 1.02 N-m (9 in-lbs) plus or minus 10 percent.
• Use conduit entry wiring (Option CT) for all high-temperature installations to avoid degradation of cable insulation from sustained heat exposure. Keep conduit runs away from direct heat sources or use heat-resistant conduit materials.
• Lubrication is not required but is recommended for maximum service life. In high-temperature applications, verify lubricant compatibility with both the seal material and the operating temperature range.

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, and ordering configuration for the High Temperature L Series, visit automaticvalve.com or contact the factory for application-specific guidance.

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

Product Catalog - L Series Compact Inline Valves: https://www.automaticvalve.com/documents/6533/Compact_Inline_Valves_L_Series_AV-IV-L_EN.pdf

Service Instructions - Compact Inline Spool Valves: https://www.automaticvalve.com/documents/405/Compact_Inline_Valves_Service_Information_Form_AV-Compact-IL_OI.pdf