Standard Pressure [CP & LF Series] Individual Solenoid Valve & Valve Manifolds

Product Overview

The ROSS Controls Dale Series CP and LF Series are families of base mounted poppet valves designed for standard pressure pneumatic applications requiring individual solenoid valves or multi-station valve manifolds. Available in 2/2 (2-way, 2-position) and 3/2 (3-way, 2-position) functions with normally closed and normally open configurations, the CP Series covers port sizes from 3/8" to 2-1/2" with flow capacities reaching Cv 108, while the LF Series covers port sizes from 3/8" to 2-1/2" with flow capacities up to Cv 64.7. Both series support solenoid pilot controlled and remote pressure controlled actuation, with inline or base-mounted manifold configurations that accept through-hole mounting for compact system assembly.

The Series CP 2- or 3-way valves are available in normally open, normally closed with solenoid, and remote pilot configurations. The 2-way valves range from 3/8" to 2-1/2" pipe size with an impressive Cv range of 3.5 to 108, providing high-flow capability in a compact valve manifold design. The 3-way valves range from 1/2" to 1" pipe size and offer a Cv range of 3.5 to 12.3. These valves can be ordered with inline or manifold base-mounted configurations with through-holes, depending on application requirements.

The manifold capability of the CP and LF Series allows customers to save time and money otherwise spent on piping and reduces potential leak paths, which saves energy. For added flexibility, the valves are available with customer-specified manifolds, enabling combinations of normally open, normally closed, solenoid pilot, and remote pressure control operation together in one manifold to create simple valve systems for traditionally complicated applications. A common application for these valves is on equipment where media of different pressure levels, including vacuum, may need to be applied sequentially to a common workpiece. Instead of piping up several valves together with hard pipe, the CP Series valves can be configured into a common manifold, made possible by the valves' revolutionary port pressure independence.

Constructed of lightweight anodized aluminum with bonded Buna-N sealing surfaces, the CP and LF Series valves are built for demanding industrial environments. The Dale Series poppet design provides near-zero leakage, strong dirt tolerance, non-lube service for easy maintenance, and pressure/media independent ports. Both CP and LF models offer either inline or stackable manifold design with through-hole mounting, and manifolds can be ordered from two to ten stations as complete valves-on-manifold assemblies to meet exact application requirements.

Key Engineering Features

• Port Pressure Independence - Revolutionary port pressure independent design allows different pressure levels, including vacuum, to be applied to separate stations on a common manifold without cross-port interference, enabling infinite design possibilities for complex multi-pressure applications.
• Poppet Construction for Near-Zero Leakage - Perpendicular poppet face seals provide positive shutoff and near-zero leakage across millions of cycles, eliminating the bypass losses and sliding seal wear inherent in spool-type valve constructions.
• Self-Cleaning and Dirt Tolerant Design - High-velocity airflow across poppet seats on each cycle dislodges contaminants and prevents buildup, delivering strong dirt tolerance in compressed air systems with particulate contamination.
• Self-Compensating for Wear - Superior internal guidance system automatically adjusts seal stroke as seals wear over time, maintaining consistent response characteristics and positive sealing throughout the extended service life of the valve.
• Repeatability Over the Life of the Valve - Poppet construction eliminates the performance degradation common in spool valves. Response characteristics remain predictable and consistent across the entire operational life of the valve.
• Positive Sealing - Double piston and poppet surface areas are precisely calculated to produce strong shifting forces in both directions, resulting in high-speed, repeatable actuation with positive sealing in both actuated and de-actuated positions.
• Base Mounted Manifold Capability - Through-hole base mounted manifold design reduces piping requirements and potential leak paths. Manifold assemblies can integrate two to ten stations with mixing of normally open, normally closed, and remote pilot functions on a single manifold body.
• Non-Lube Service - Valves do not require air line lubrication for standard service, simplifying maintenance requirements and reducing the risk of contamination from lubricant-related fouling.
• High Flow in Compact Envelope - CP Series 2-1/2" body provides Cv 108 flow capacity in a compact base-mounted package. LF Series provides Cv 64.7 at 2" and 2-1/2" port sizes. Both series deliver high-flow performance for size.
• Field-Convertible External Pilot Supply - CP and LF Series valves can be easily field converted from internal to external pilot supply by removing the pipe plug from port X-1 and installing an external air supply, without requiring replacement parts or model changes.
• Manifold Configurability - Individual valve stations on a manifold can be ordered with different valve functions, normally open/closed configurations, and actuation types, enabling customized multi-function manifolds from a single compact assembly.
• Continuous Duty Rated Solenoids - Solenoid pilot valves are rated for continuous electrical duty with IP65 enclosure protection per IEC 60529, and are available with EN 175301-803 Form A or Form C electrical connectors.

Technical Specifications

General Specifications

Temperature Ratings

The CP and LF Series are designed for standard industrial temperature environments. Solenoid pilot valves carry a narrower ambient rating due to solenoid coil thermal limits; the wider media temperature range applies to the valve body and seals.

Important: For media temperatures near the upper limit of 175 F (80 C), verify that the compressed air supply is free of entrained moisture that can cause accelerated seal degradation. Do not exceed rated ambient temperature at the solenoid pilot housing.

Electrical Data (Solenoid Pilot Valves)

All solenoid coils are rated for continuous duty. CP and LF Series B-model valves use EN 175301-803 Form A or Form C connectors. Power consumption varies by body size. Electrical connectors are not included with the valve and must be ordered separately.

Electrical Connection Options

Certifications & Compliance

Typical Applications & Industries

Sequential Process Control and Multi-Pressure Systems

• Equipment requiring sequential application of media at different pressure levels, including vacuum, to a common workpiece. The port pressure independence of CP Series manifolds allows multiple pressure zones to share a single manifold without cross-port interference.
• Leak testing circuits where multiple test pressures or vacuum must be applied in sequence to a single test fixture. The CP and CX models can be configured on a common manifold, combining normally open, normally closed, and pressure controlled stations for complex test sequences.
• Vacuum forming and packaging operations requiring precise pressure sequencing from vacuum through positive pressure across multiple stages, served by a single compact manifold assembly.

Pulp and Paper and Process Industries

• Pulp slurry flow control and process fluid direction control in paper manufacturing, where the poppet design provides near-zero leakage and high dirt tolerance critical for reliable operation in contaminated media environments.
• Chemical processing and fluid handling applications requiring reliable directional control with minimal leakage and resistance to particulate contamination carried in the process media.

Cylinder and Actuator Control

• CP Series 3-way valves can be ported from the bottom and attached directly to the rod end and cap end of pneumatic cylinders, increasing speed, eliminating line loss, improving cylinder control, and reducing operating cost versus remote valve mounting.
• CP Series 3-way valves can also be supplied as cartridge valves machined directly into cylinder heads, providing maximum integration and flow efficiency for high-cycle automation systems.
• Large cylinder control and stamping press air systems where high-flow 2-1/2" CP Series valves with Cv 108 provide the volume capacity required for fast press cycling.

Automotive and Assembly Automation

• Automotive body shop actuators, assembly line press controls, and high-cycle automation where the poppet design's dirt tolerance and repeatable response reduce maintenance intervals and unplanned downtime.
• Assembly and test fixtures requiring multiple air control functions in a compact footprint, served by CP Series manifolds combining different valve functions in a single base-mounted assembly.

Packaging and Material Handling

• Vacuum pick-and-place systems, case erecting, carton sealing, and palletizing equipment benefiting from the high-flow, self-cleaning poppet design and compact base-mounted manifold configuration.
• High-throughput packaging lines where multiple actuators must be controlled from a centralized valve manifold, reducing tubing runs and simplifying pneumatic system architecture.

General Industrial and OEM Applications

• OEM machine builders requiring compact, high-flow directional valves with manifold flexibility to combine diverse valve functions in customer-specified configurations without excess piping.
• Food and beverage processing equipment where non-lube service and easy maintenance of the Dale Series poppet design reduce service intervals and contamination risk.
• Any application requiring superior performance relative to diaphragm or ball valve constructions, particularly where high-flow capacity, bi-directional blocking, and long cycle life are required.

Ordering and Model Number Configuration

The ROSS Dale Series CP and LF valves use a structured model number system that identifies valve function, body size, pilot type, port thread, and electrical configuration. Below is a breakdown of the CP Series model number structure for solenoid pilot controlled valves.

Voltage codes: W = 24 VDC; Z = 110 volts AC / 120 volts AC 50/60 Hz.

For BSPP (G) threads, replace 'N' in the model number with 'D', for example CP14DA37101W or LF13DA37101W.

For external pilot supply, replace the pilot supply code digit '1' with '5', for example CP14NA37501W.

For manifold versions, replace the 'X' position in the model number with the number of stations (2 through 9; use 0 for a 10-station manifold). Example: CP14NA37114W for a 4-station manifold.

For vacuum service, replace the 'CP' prefix with 'CX' for 2/2 valves. For 3/2 valves in vacuum service, consult ROSS Controls.

Electrical connectors are not included and must be ordered separately. See accessories section for connector model numbers.

Complete valves-on-manifold assemblies with different valve functions on each station can be ordered using the manifold configurator. Contact ROSS Controls or your authorized distributor for custom manifold configurations.

3/2 valves for vacuum applications: consult ROSS Controls.

Manifolds are available from 2 to 10 stations. For 1-station manifold or more than 10 stations, contact ROSS Controls.

Accessories

Electrical Connectors - CP Series (2/2 Valves, Ports 1/2" and 1")

Lighted and pre-wired EN 175301-803 connectors for CP Series 2/2 valves with 1/2" and 1" port sizes.

Electrical Connectors - CP Series (2/2 Valves, Ports 1-1/2" and 2-1/2")

Lighted and pre-wired EN 175301-803 connectors for CP Series 2/2 valves with 1-1/2" and 2-1/2" port sizes.

Electrical Connectors - CP Series (3/2 Valves, Port 1/2")

Lighted and pre-wired EN 175301-803 connectors for CP Series 3/2 valves with 1/2" port size.

Electrical Connectors - LF Series

Lighted and pre-wired connectors for LF Series solenoid pilot controlled valves. NC port sizes 3/8" and 1/2", and all NO port sizes 3/8" through 1" use the 267/382 series connectors. NC port sizes 3/4" through 2-1/2" use the 936/720 series connectors.

Exhaust Silencers

Aluminum exhaust silencers for CP and LF Series valves to reduce exhaust noise. Silencers must have flow capacities at least as great as the exhaust capacities of the valves to prevent back pressure buildup.

Warning: Exhaust silencers must be resistant to clogging and must have flow capacities at least as great as the exhaust capacities of the valves. Contaminated silencers can cause increased back pressure and adversely affect valve operation. ROSS expressly disclaims all warranties and responsibility for unsatisfactory performance caused by wrong type, wrong size, or inadequately maintained silencers.

Related Products & Accessories

• CP and CX Valve Series - Multi Station Valve Manifolds - CX Series leak tight and vacuum variants of the Dale Series for applications requiring leak tight construction, low pressure, or vacuum service on 2/2 functions. https://www.rosscontrols.com/en/series/253-cp-cx-valve-series
• Classic 27 Series Standard Temperature Inline Valves - Classic inline poppet valves with port sizes from 1/4" to 2-1/2" for standard temperature industrial applications with Cv up to 82. https://www.rosscontrols.com/en/series/230-standard-temperatures-classic-27-series
• Classic 21 Series Low and High Temperature Valves - Inline poppet valves for extreme temperature applications from -40 F to 300 F in 1/4" conduit connection configuration. https://www.rosscontrols.com/en/series/231-low-high-temperatures-classic-21-series
• 21 Series DIN and M12 Low and High Temperature Valves - 21 Series inline poppet valves with DIN EN 175301-803 and M12 quick-disconnect connections for extreme temperature applications. https://www.rosscontrols.com/en/series/2759-lowhigh-temperatures-din-m12-connection-21-series
• Electrical Connectors - DIN EN 175301-803 Form A, Form B, and Form C connectors, lighted versions, and pre-wired assemblies for ROSS solenoid valves. https://www.rosscontrols.com/en/series/91-electrical-connectors
• Exhaust Silencers - Aluminum silencers for port sizes 1/2" through 1-1/2" to reduce exhaust noise in pneumatic systems. https://www.rosscontrols.com/en/series/90-silencers
• Lockout Valves - L-O-X Energy Isolation - L-O-X lockout valves for safe energy isolation during maintenance per OSHA lockout/tagout requirements (OSHA 1910.147). https://www.rosscontrols.com/en/series/1287-lockout-valves-15-series

Frequently Asked Questions (FAQ)

Q: What is the difference between the CP Series and the LF Series?

A: Both series are part of the ROSS Dale Series base mounted poppet valve family for standard pressure applications. The CP Series uses a compact base-mounted body design with body sizes tied to the inlet port size, and supports both 2/2 and 3/2 valve functions with inlet ports from 3/8" to 2-1/2" and maximum Cv of 100 to 108. The LF Series is a full-bore variant with a different body geometry offering inlet port sizes from 3/8" to 2-1/2" and maximum Cv of 64.7, and is available in 2/2 functions only. Both series operate on the same standard pressure range of 30 to 145 psig (2 to 10 bar) with internal or external pilot supply.

Q: What does port pressure independence mean?

A: Port pressure independence means that each valve station on a CP Series manifold can operate with a different inlet pressure, including vacuum, without affecting adjacent stations. This is possible because of the poppet construction's double-acting sealing geometry. In practice, this allows a single manifold to serve multiple process zones with different pressure levels, sequentially or simultaneously, without cross-port pressure interference. This eliminates the need to pipe multiple separate valves and manifolds for multi-pressure applications.

Q: What is the minimum operating pressure for CP and LF Series valves?

A: For solenoid pilot controlled CP and LF Series valves, the minimum inlet pressure is 30 psig (2 bar) and the minimum pilot pressure is also 30 psig (2 bar). Pilot pressure must always be equal to or greater than inlet pressure. For vacuum service applications, an external pilot supply of at least 30 psig (2 bar) is required, and the valve must be ordered with the external pilot supply configuration.

Q: Can CP Series valves be used for vacuum applications?

A: Yes, but vacuum service requires specific ordering. For 2/2 valves in vacuum service, replace the 'CP' prefix in the model number with 'CX', which is the leak tight variant designed for vacuum, low pressure, and leak tight applications. For 3/2 valves in vacuum service, consult ROSS Controls directly. All vacuum service configurations require external pilot supply, and an external pilot pressure of at least 30 psig (2 bar) must be maintained.

Q: How many stations can be combined in a CP Series manifold?

A: Standard manifold assemblies are available from 2 to 10 stations. To specify the number of stations in the model number, replace the 'X' digit with the station count (2 through 9 for 2 to 9 stations; use 0 for a 10-station manifold). For 1-station manifolds or assemblies requiring more than 10 stations, contact ROSS Controls. Different valve functions, normally open, normally closed, solenoid pilot, and remote pressure controlled, can be combined on a single manifold using the manifold configurator.

Q: Can I mix normally open and normally closed valves on the same manifold?

A: Yes. The Dale Series CP manifold design allows normally open, normally closed, solenoid pilot controlled, and remote pressure controlled valve functions to be combined on a single manifold assembly. When ordering preassembled manifolds with mixed configurations, use the manifold configurator and specify the valve function for each station position. For mixed-configuration manifolds, contact ROSS Controls or your authorized distributor.

Q: How do I convert a CP Series valve to external pilot supply in the field?

A: Field conversion from internal to external pilot supply is straightforward. Remove the existing pipe plug from port X-1 on the manifold base or top plate, then install a 10-32 or 1/8" NPT air supply line to port X-1. For B-model valves, the port X-1 also accepts M5 or G1/8 connections. Note that vacuum service applications always require external pilot supply and must be ordered accordingly.

Q: Do CP and LF Series valves require lubrication?

A: No, the CP and LF Series are rated for non-lube service and do not require air line lubrication for standard operation. If lubrication is used, only petroleum-based oils with an aniline point between 180 F (82 C) and 220 F (104 C) and an ISO 32 or lighter viscosity are compatible. Avoid oils with phosphate-type additives, which can harm polyurethane components and lead to valve failure.

Q: What filtration is recommended for CP and LF Series valves?

A: ROSS recommends a 5-micron rated inlet air filter installed close to the valve to maximize valve life and prevent contaminants from interfering with proper sealing. Dirty or contaminated compressed air systems are the most common cause of premature valve wear. The poppet design provides inherent dirt tolerance through self-cleaning action, but proper filtration remains essential for optimal service life.

Q: Are BSPP thread options available for the CP and LF Series?

A: Yes. Standard models ship with NPT threads. To order with BSPP (G) threads, replace the 'N' character in the model number with 'D'. For example, CP14NA37101W becomes CP14DA37101W for BSPP threads, and LF13NA37101W becomes LF13DA37101W for BSPP threads.

Q: Can the CP Series 3-way valve be mounted directly to a cylinder?

A: Yes. The CP Series 3-way valves can be ported from the bottom and attached directly to the rod end and cap end of a pneumatic cylinder. The CP Series 3-way can also be supplied as a cartridge valve machined directly into the cylinder heads. Both methods increase speed, eliminate line loss, improve cylinder control, and reduce operating cost compared to remote valve mounting with long tubing runs.

Q: What electrical connectors are compatible with CP and LF Series valves?

A: CP and LF Series valves use EN 175301-803 Form A or Form C electrical connectors, which are ordered separately. For CP Series 2/2 valves with 1/2" and 1" port sizes, use connectors 2306K77 (lighted only) or 2307K77 (pre-wired with 2-meter cord). For 1-1/2" and 2-1/2" port sizes, use 936K87 (lighted only) or 720K77 (pre-wired). For LF Series, connector selection depends on port size and NC/NO configuration. See the accessories section for complete connector model number tables.

Q: What are the standard voltages available for solenoid pilot valves?

A: Standard voltages are 24 VDC and 120 VAC 50/60 Hz. In the model number, the voltage code 'W' designates 24 VDC and 'Z' designates 110 VAC or 120 VAC. Voltage and hertz ratings are shown on the pilot housing of each valve. The electrical supply must match these ratings; mismatched voltage can cause early solenoid failure.

Q: Are exhaust silencers required and which models are compatible?

A: Exhaust silencers are optional accessories used to reduce exhaust noise, but they must be selected carefully. The silencer must have a flow capacity at least as great as the exhaust capacity of the valve. Contaminated or undersized silencers can cause back pressure that adversely affects valve operation. Compatible ROSS silencers for the Dale Series include model 5500A4003 (1/2" port, Cv 4.7) and 5500A6003 (1" port, Cv 14.6). For BSPP thread silencers, add the 'D' prefix.

Q: What safety precautions apply before servicing Dale Series valves?

A: Before servicing any Dale Series valve, turn off all electrical power to the valve, shut off the air supply, and exhaust all air in the system. Lock out all power sources per OSHA 1910.147 and EN 1037 requirements. Dale Series CP, CX, LF, and LX valves are not designed as control valves for air clutch and brake mechanisms on mechanical power presses and must not be used for such applications. Only double valves conforming to OSHA standards should be used in mechanical press applications.

Installation & Maintenance Guidelines

• Before installing a valve in a new or existing system, blow all air lines clean of contaminants. Install an air filter with a 5-micron rating in the inlet line close to the valve to protect sealing surfaces and poppet seats.
• Verify that the supply line is of adequate size and is not restricted by crimps, sharp bends, or clogged filter elements. Restricted supply can reduce air pressure below the 30 psig (2 bar) minimum, causing erratic operation.
• Locate the valve as close as possible to the actuator or mechanism being controlled. Keep outlet lines free of crimps and sharp bends to allow fast, efficient pressurizing and exhausting of the downstream system.
• Do not restrict the exhaust port of the valve body or pilot body. Use efficient ROSS-approved silencers when exhaust noise reduction is required, and verify silencer flow capacity equals or exceeds the valve exhaust capacity to prevent back pressure.
• For solenoid pilot controlled valves, verify that the electrical supply voltage and hertz rating match those shown on the pilot housing before energizing. Mismatched voltage will cause premature solenoid failure. The power supply must handle inrush current without significant voltage drop.
• For valves with internal pilot supply (standard), no external pilot connection is required. Inlet pressure must meet the 30 psig (2 bar) minimum at all times to maintain reliable shifting. For external pilot supply, connect a 10-32 or 1/8" NPT line to port X-1; pilot pressure must equal or exceed inlet pressure at all times.
• To convert from internal to external pilot supply in the field, remove the pipe plug from port X-1 on the manifold base or top plate and install the external air supply. B-model valves also accept M5 or G1/8 connections at port X-1.
• When installing pipe in valve ports, engage the pipe one turn, apply pipe thread sealant (thread tape is not recommended for sealant), then tighten the pipe. This prevents sealant from entering and contaminating the valve internals.
• For base mounted manifold configurations, verify that the mounting surface is flat and free of burrs or raised features that could prevent full contact with the manifold base. Use the correct fastener torque as specified in the product catalog to prevent manifold body distortion.
• Inlet station 1 on manifold assemblies is on the right when viewing from the outlet ports. Verify station numbering orientation before making pipe connections to avoid reversed port assignments.
• For vacuum service applications, use the CX Series (not CP Series) for 2/2 functions and order with external pilot supply configuration. Always maintain external pilot pressure of at least 30 psig (2 bar) for vacuum service, independent of the vacuum inlet pressure.
• Before energizing or pressurizing an overhauled or serviced valve, perform a functional test to verify proper operation. Do not return a valve to service if it fails the functional test; contact ROSS Controls or your authorized distributor for assistance.
• Only use lubricants compatible with Buna-N seal materials. Acceptable lubricants are petroleum-based oils with an aniline point between 180 F (82 C) and 220 F (104 C) at ISO 32 viscosity or lighter. Do not use oils with phosphate-type additives.
• Do not exceed rated ambient temperature at the solenoid pilot housing (120 F / 50 C maximum). In high-ambient environments, ensure adequate ventilation around the solenoid to prevent coil overheating.
• Pneumatic equipment installation, servicing, and maintenance must be performed only by persons trained and experienced with pneumatic equipment. Read all installation instructions, warnings, and cautions before proceeding with installation or service.

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.

For product selection, technical configuration assistance, manifold ordering, and distributor locator services, contact ROSS Controls USA at (800) 438-7677 or +1-248-764-1800, or visit rosscontrols.com.

For complete technical data, dimensional drawings, installation instructions, product catalog downloads, and the Dale Series manifold configurator, visit the ROSS Controls product page at rosscontrols.com/en/series/234-standard-pressure-cp-lf-series.

Download Catalog: https://www.rosscontrols.com/en/series/234-standard-pressure-cp-lf-series