Standard Temperatures with Air Logic [Classic 27 Series] 2/2, 3/2, & 4/2 Functions, 1/4" to 1-1/2" Port Sizes

Product Overview

The ROSS Controls is a family of inline poppet directional control valves within the proven 27 Series platform, distinguished by the integration of LOGICAIR pneumatic logic adaptors that add advanced sequencing, timing, and force-multiplication functions directly to the valve body without external electrical components. Available in 2/2, 3/2, and 4/2 functions with port sizes from 1/4" to 1-1/2", these valves reach maximum flow capacities of 34 Cv (33,000 Nl/min) and operate across a standard temperature range of 40 to 175 F (4 to 80 C) for media and up to 120 F (50 C) ambient for solenoid models.

Directional control valves in pneumatic circuits control the direction, start, and stop of compressed air flow. The 27 Series poppet construction eliminates sliding action between internal components, producing near-zero leakage through positive face sealing, self-cleaning behavior from high-velocity airflow across the seat, and consistent response times throughout the life of the valve. The Series builds on this foundation by adding LOGICAIR adaptors that enable functions such as delayed actuation and deactuation, impulse-controlled detented operation from a single pressure source, and actuating force multiplication for use with low pilot pressures.

Both solenoid pilot controlled and pneumatic pressure controlled actuation options are available. Solenoid variants carry multiple voltage offerings for AC and DC power supplies, with flush rubber non-locking manual override buttons standard on all solenoid models. Pressure controlled variants are well suited for intrinsically safe or explosion-proof installations where electrical components must be minimized. All variants accept internal or external pilot supply, with field conversion between the two requiring only relocation of a pipe plug.

For design engineers specifying pneumatic components in general industrial, packaging, automotive, or process applications, the series provides a compact way to implement pneumatic logic directly at the valve without auxiliary logic elements, dedicated timing relays, or additional solenoid stages.

Key Engineering Features

• LOGICAIR Pneumatic Logic Adaptors - Six distinct adaptor types mount directly to the 27 Series valve body to provide timed sequence actuation/deactuation, impulse-controlled detented operation, actuating force multiplication, and inlet-port-controlled timing without any electrical components.
• Poppet Construction for High Dirt Tolerance - Perpendicular poppet face seals create a high-flow path with positive shutoff. High-velocity airflow across the seat provides self-cleaning action, enabling reliable operation in contaminated air environments without the progressive wear of spool-type valves.
• Near-Zero Leakage and Positive Sealing - The poppet face seal geometry maintains tight shutoff across the full operating pressure range, eliminating the bypass losses associated with clearance-type spool seals.
• No Sliding Action - Internal components move axially without sliding contact, preventing the abrasion-driven leakage growth that characterizes spool valves over extended service life.
• Consistent Response Time Over Valve Life - The differential piston actuation design delivers stable shift times throughout millions of cycles, enabling accurate response time prediction using the published M and F constants.
• Internal or External Pilot Supply - Field-convertible between internal and external pilot supply by relocating a pipe plug, without requiring a different valve body or model number change in most configurations.
• Inline Mounting Close to Actuator - Inline body design allows installation directly adjacent to the actuator, reducing the volume of pipe that must be pressurized or exhausted on each cycle and improving overall system response time.
• Non-Locking Manual Override - Flush rubber non-locking override button is standard on all solenoid pilot models for commissioning, troubleshooting, and system verification.
• NPT and G Thread Options - All port sizes are offered in both NPT and G (BSPP) thread standards to accommodate North American and international system requirements.
• TUV SIL 2 Certification - The 27 Series is TUV Rheinland certified to SIL 2 per IEC 61508/61511 and PL c per EN ISO 13849-1 in singular application, and SIL 3 and PL e in redundant configurations with HFT greater than or equal to 1.

Technical Specifications

General Specifications

Temperature Ratings

The Series operates within a standard industrial temperature range. Solenoid pilot controlled models have a narrower ambient temperature window than pressure controlled models due to solenoid coil thermal limits.

Important: For media temperatures at or near the 175 F upper limit, confirm that compressed air supply is properly filtered and dried to prevent condensation-related degradation of Buna-N seals.

Electrical Data (Solenoid Pilot Valves)

All solenoid coils are rated for continuous duty. DC models draw 14 watts per solenoid. AC models draw 87 VA inrush and 30 VA holding (single solenoid) or 190 VA inrush and 40 VA holding (double solenoid). Indicator lights are standard on double solenoid valve solenoid housings.

Electrical Connection Options

Flow Performance Data

Flow coefficient (Cv) values shown for representative 3/2 normally closed solenoid pilot and pressure booster pressure controlled configurations. Response time is calculated as: Response Time (msec) = M + (F x V), where V is the downstream volume in cubic inches to be filled to 90% of supply pressure or exhausted to 10% of supply pressure.

Response Time Formula: Response Time (ms) = M + (F x V), where M is the minimum response constant (ms), F is the fill or exhaust factor (ms/in3), and V is the downstream volume in cubic inches. M and F values are published per body size and function in the ROSS 27 Series LOGICAIR catalog.

Certifications & Compliance

Typical Applications & Industries

Automated Assembly and General Industrial Machinery

• Sequential cylinder actuation in assembly transfer lines where timed sequence adaptors control the delay between successive pneumatic actuator strokes without programmable logic controller outputs.
• Pick-and-place and clamping fixtures requiring air index (detented) memory function to hold position after a momentary pilot signal, reducing compressed air consumption during extended dwell periods.
• Conveyor and material handling systems where inline poppet valves installed close to actuators minimize air volumes and improve cycle time.
• Pneumatic press and forming operations that require controlled actuation timing and reliable high-flow delivery to large bore cylinders.

Packaging and Printing

• Case erecting, carton sealing, and palletizing systems where the self-cleaning poppet design tolerates the particulate-laden air environments common in packaging lines.
• Vacuum pick-and-place cup control using 3/2 normally open or normally closed configurations with timed-out deactuation to maintain grip during transfer.
• Web tension and registration control on printing presses where consistent valve response times are critical for register accuracy.
• Blowing and reject ejection functions in product inspection lines where momentary pilot signals must reliably produce a single, defined actuation event.

Automotive Body and Paint Shops

• Actuator controls in automotive body shop resistance welding fixtures and clamping guns, where poppet durability and dirt tolerance reduce unplanned downtime.
• Paint line conveyor stop-and-go cylinder control with timed sequence delays for controlled part positioning without electrical timing relays.
• Underbody coating and sealing application equipment using pressure booster adaptors to reliably shift valves when pilot pressure varies across long air supply runs.

Metals, Glass, and Process Industries

• Pneumatic actuator control in steel and aluminum processing lines where media temperatures approach 175 F and ambient temperatures in solenoid zones remain within the 120 F solenoid limit.
• Glass forming and annealing lehr pneumatic controls using pressure controlled variants in hot ambient zones up to 175 F where solenoid coils cannot be mounted.
• Chemical process isolation valve actuation in facilities requiring SIL 2 rated pneumatic components in safety instrumented systems per IEC 61511.
• Foundry pneumatic controls where high particulate content in compressed air supply demands the self-cleaning, high-dirt-tolerance poppet design.

Ordering and Model Number Configuration

The ROSS 27 Series with LOGICAIR uses a structured model number system that encodes the adaptor type, valve function, actuation method, port configuration, and electrical specifications. The prefix D indicates G (BSPP) threads; standard (no prefix) models carry NPT threads.

Voltage codes for solenoid pilot models: W = 24 VDC; Z = 110-120 VAC, 50/60 Hz; Y = 230-240 VAC, 60 Hz. For other voltages, contact ROSS Controls.

Adaptor codes: 9 = Pressure Booster (solenoid); 8 = Air Index / Timed In/Out Sequence (solenoid); 4 = Timed In Sequence; 5 = Timed Out Sequence; 6 = Timed In Sequence with Extension Adaptor; 7 = Timed Out Sequence with Extension Adaptor. For pressure controlled adaptors, the actuation code shifts to 5 and adaptor suffixes follow the same logic.

For G (BSPP) threads, add the prefix D before the model number (e.g., D2773B2009W).

When ordering double solenoid 4/2 valves with LOGICAIR adaptors, specify both solenoid voltage codes if using mixed actuation, or contact ROSS for configuration guidance.

For explosion-proof solenoid pilot options for use in classified hazardous areas, consult ROSS Controls directly.

Body and Port Size Codes

LOGICAIR Adaptor Flow Summary

Accessories

Exhaust Silencers

Aluminum exhaust silencers are available for all exhaust port sizes. Rated to 290 psig (20 bar). Silencer flow capacity must equal or exceed the exhaust capacity of the connected valve to prevent back pressure that could interfere with valve shifting.

Warning: Exhaust silencers must have flow capacities at least as great as the exhaust capacities of the connected valves. Contaminated or clogged silencers increase back pressure and can cause incomplete or erratic valve shifting.

Hex Nipples for Female-Thread Silencer Connections

Steel male-male hex nipples for connecting female-thread exhaust silencers to valve exhaust ports.

Manual Override Kits

Replacement and upgrade manual override kits for solenoid pilot 27 Series valves.

Indicator Light Kits

Indicator light kits for single solenoid 27 Series models (standard on double solenoid models). Provides visual indication that the solenoid is energized.

Related Products & Accessories

• Standard Temperatures Classic 27 Series (without Air Logic) - 27 Series inline poppet valves without LOGICAIR adaptors, available in port sizes up to 2-1/2" for higher flow requirements. https://www.rosscontrols.com/en/series/230-standard-temperatures-classic-27-series
• Low/High Temperatures Classic 21 Series (DIN/M12 Connection) - 21 Series inline poppet valves with DIN/M12 quick-disconnect connections for extreme temperature applications from -40 F to 300 F. https://www.rosscontrols.com/en/series/2759-lowhigh-temperatures-din-m12-connection-21-series
• Low/High Temperatures Classic 21 Series (Conduit Connection) - 21 Series inline poppet valves with 1/2" conduit connections for low and high temperature applications. https://www.rosscontrols.com/en/series/231-low-high-temperatures-classic-21-series
• Vacuum Standard Temperatures Classic 27 Series - 27 Series inline poppet valves configured for vacuum applications at standard temperatures. https://www.rosscontrols.com/en/series/232-vacuum-standard-temperatures-classic-27-series
• Exhaust Silencers - Aluminum exhaust silencers rated to 290 psig for 1/2", 1", and 1-1/2" port sizes to reduce exhaust noise. https://www.rosscontrols.com/en/series/90-silencers
• Lockout Valves (Energy Isolation) - L-O-X lockout valves for safe energy isolation during maintenance per OSHA lockout/tagout requirements. https://www.rosscontrols.com/en/series/1287-lockout-valves-15-series

Frequently Asked Questions (FAQ)

Q: What distinguishes the series from the standard 230 Series 27 Series valves?

A: The Series includes LOGICAIR pneumatic logic adaptors mounted directly to the 27 Series valve body. These adaptors provide timed sequence delays, air index detented memory function, pressure boost for low pilot pressures, and inlet-port-controlled timing entirely through pneumatic means. The 230 Series is the same 27 Series platform without LOGICAIR adaptors, and is available in larger port sizes up to 2-1/2".

Q: What LOGICAIR adaptor types are available on the series?

A: Six adaptor types are available: Pressure Booster (increases piston actuation force for low pilot pressures), Air Index (impulse-controlled detented operation from a single signal source), Timed Sequence (adjustable delay on actuation or deactuation, up to 30 seconds for 2/2 and 3 seconds for 3/2 and 4/2), Timed Sequence Extension (extends delay up to 60 seconds and adds snap action), Timed In/Out Sequence (independent adjustable delays on both actuation and deactuation), and Inlet Port Controlled Timed-In Sequence (adaptor responds to inlet port pressure instead of a separate pilot signal).

Q: What is the maximum flow capacity of the series?

A: Maximum flow capacity is 34 Cv (33,000 Nl/min) for valves equipped with Timed Sequence and Timed Sequence Extension adaptors at the 1-1/4" to 1-1/2" body size. Pressure Booster and Air Index adaptors reach up to 32 Cv (31,000 Nl/min) and 27 Cv (27,000 Nl/min) respectively at the largest port sizes.

Q: What is the operating pressure range?

A: Standard operating pressure is 15 to 150 psig (1 to 10 bar) across all port sizes from 1/4" to 1-1/2" in the series. When using a Pressure Booster adaptor, pilot pressures as low as 15 psig (1 bar) can still reliably actuate the valve.

Q: What are the temperature ratings?

A: Solenoid pilot controlled models operate at ambient temperatures of 40 to 120 F (4 to 50 C) and media temperatures of 40 to 175 F (4 to 80 C). Pressure controlled models extend the ambient rating to 40 to 175 F (4 to 80 C) with the same media temperature limit. All Series valves use Buna-N seals.

Q: Can the series be used in safety-critical (SIL-rated) applications?

A: Yes. The 27 Series is TUV Rheinland certified to SIL 2 per IEC 61508/61511 and PL c per EN ISO 13849-1 in singular application. In a redundant configuration with HFT greater than or equal to 1, the valves achieve SIL 3 and PL e. Consult ROSS Controls for the specific safety data sheet applicable to the selected adaptor and function combination.

Q: How does the Air Index adaptor work?

A: The Air Index adaptor converts the valve into an impulse-controlled, mechanically detented valve. The first momentary pilot signal actuates the valve and it remains in the actuated position after the signal is removed. The next momentary signal from the same source deactuates the valve and it holds in the deactuated position. This cycle repeats with each successive momentary signal, providing memory function without electrical latching or detented solenoids.

Q: Can the valve be converted between internal and external pilot supply?

A: Yes. The pilot supply can be field-converted between internal and external by relocating the pipe plug between the external pilot port and the internal pilot passage. When using an external pilot supply, the pilot pressure must be equal to or greater than the inlet pressure.

Q: Is air line lubrication required?

A: The base 27 Series valve does not require air line lubrication. However, the Timed Sequence Extension Adaptor requires air line lubrication when installed. When lubrication is used, specify a petroleum-based lubricant with an aniline point between 180 F and 220 F, ISO 32 viscosity or lighter, at approximately one drop per minute. Avoid lubricants with phosphate-type additives.

Q: What thread types are available?

A: All port sizes are available in both NPT and G (BSPP) threads. Standard model numbers carry NPT threads. To order G (BSPP) threads, add the prefix D before the model number (e.g., D2773B2009W instead of 2773B2009W).

Q: Are 3D CAD models available?

A: Downloadable CAD models are available for Series variants through the ROSS Controls website. Contact ROSS Controls at rosscontrols.com or (800) 438-7677 for access.

Q: How do I calculate valve response time?

A: Response Time (ms) = M + (F x V), where M is the minimum response constant in milliseconds, F is the fill or exhaust factor in ms per cubic inch, and V is the downstream volume in cubic inches to be filled to 90% of supply pressure or exhausted to 10% of supply pressure. M and F values for each body size and function are published in the ROSS 27 Series LOGICAIR product catalog.

Installation & Maintenance Guidelines

• Mount inline in any orientation; vertical mounting is preferred for optimal performance and condensate drainage.
• Supply filtered air with 5-micron filtration recommended to maximize valve and adaptor life and prevent contaminants from interfering with poppet sealing or LOGICAIR adaptor needle valves.
• Do not restrict supply lines or exhaust ports; restrictions reduce pressure below the 15 psig minimum operating pressure and cause erratic or incomplete shifting.
• For external pilot supply configurations, pilot pressure must be equal to or greater than inlet pressure.
• When using the Timed Sequence Extension Adaptor, air line lubrication is required. Use a petroleum-based lubricant with aniline point between 180 F and 220 F, ISO 32 viscosity or lighter, approximately one drop per minute. Do not use lubricants with phosphate-type additives, as these degrade Buna-N seals.
• Set LOGICAIR timed sequence delay intervals by adjusting the continuously adjustable tapered needle valve on the adaptor before commissioning. Verify the delay interval under actual operating pressure and load conditions.
• Verify that exhaust silencers have flow capacities at least as great as the exhaust capacities of the valves. Contaminated silencers increase back pressure and can cause incomplete valve shifting.
• For field conversion between internal and external pilot supply, relocate the pipe plug between the external pilot port and the internal pilot passage. Ensure pilot pressure meets the minimum operating requirement after conversion.
• When installing pressure controlled variants in ambient temperatures above 120 F, confirm that all solenoid components are mounted outside the elevated-temperature zone. Pressure controlled valve bodies are rated to 175 F ambient.
• Install the valve with connection ports accessible for inspection and maintenance. LOGICAIR adaptors may require periodic cleaning of the tapered needle and orifice if operating with contaminated air supply.

Warranty & Global Support

ROSS Controls provides a one-year warranty on all products, covering defects in material and workmanship from date of purchase.

Global technical support is available through ROSS offices in the USA (headquarters in Ferndale, Michigan), Canada, Brazil, Germany, France, United Kingdom, India, China, and Japan.

Contact ROSS Controls USA at (800) 438-7677 or (888) TEK-ROSS for technical support, or visit rosscontrols.com for product configuration, documentation downloads, and distributor locator services.

For complete technical data, dimensional drawings, LOGICAIR adaptor specifications, and valve configurator access, refer to the ROSS 27 Series Inline Poppet Valves with LOGICAIR Adaptors product catalog available for download at rosscontrols.com.

Product Catalog - 27 Series with LOGICAIR: https://www.rosscontrols.com/en/documents/394?filename=Directional_Control_Valves_27_Series_Logicair_ROSS-27-LA_EN.pdf

Operating Instructions - 27 Series ATEX: https://www.rosscontrols.com/en/documents/160?filename=21_27_Series_Poppet_Valves_Operation_Manual_ATEX_RE-05_Rev.05.2015.pdf

Installation Instructions - 27 Series: https://www.rosscontrols.com/en/documents/50?filename=ROSS_27_Series_Poppet_Valve_And_Adaptors_Installation_Instructions_SS096.pdf