Built on ROSS's foundation of dirt-tolerant poppet technology, the SV27 Series delivers near-zero leakage performance with integral safety-rated feedback systems that meet the stringent requirements of modern industrial safety standards including ISO 13849-1 Category 2 PL c and SIL 2 certification.

Key Features and Valve Technologies

Poppet Construction and Performance Benefits

The SV27 Series utilizes advanced poppet construction engineering that delivers superior performance across multiple dimensions:

Near-Zero Leakage Design: The face-sealing poppet mechanism provides exceptional sealing performance, virtually eliminating air loss in both energized and de-energized states. This design ensures reliable energy isolation during safety events and reduces operational costs through minimized compressed air consumption.

Dirt Tolerant Operation: Unlike spool-type valves susceptible to contamination-related failures, the SV27's poppet design features wear-compensating characteristics that maintain reliable operation even in challenging industrial environments. The self-cleaning action and robust sealing surfaces provide consistent performance across millions of cycles.

Quick Response Time: The poppet mechanism delivers fast actuation speeds essential for safety applications where milliseconds matter. Low friction design enables rapid shifting, ensuring prompt response to safety signals and emergency stop conditions.

High Flow Capacity: Despite compact dimensions, SV27 valves provide exceptional Cv ratings ranging from 8 Cv (7,872 Nl/min) in 3/4" body sizes to 71 Cv (69,864 Nl/min) in 2" configurations, supporting high-demand pneumatic applications without flow restrictions.

Safety-Rated External Monitoring System

The SV27 Series incorporates sophisticated monitoring technology that provides real-time feedback on valve position and operational state:

DPST Switch Technology: Each valve features a directly-operated, safety-rated, force-guided positive-break Double-Pole Single-Throw (DPST) switch with both normally open (NO) and normally closed (NC) contacts. This positively-driven switch mechanism ensures reliable feedback even under fault conditions.

99% Diagnostic Coverage: When integrated with proper monitoring systems, the SV27 achieves an exceptional diagnostic coverage (DC) of 99%, enabling early fault detection and predictive maintenance capabilities that minimize unplanned downtime.

Integrated Pressure Verification Port: An integrated 1/8" NPT sensor port accommodates optional visual pop-up indicators or electrical pressure switches, providing enhanced safety verification through direct pressure monitoring at critical system points.

Electrical Feedback Specifications: The feedback switch accommodates a wide range of control systems with ratings from 50 mA/24 volts DC (minimum) to 2.5 A/120 volts AC (maximum), ensuring compatibility with modern safety PLCs and legacy control architectures.

L-O-X® Lockout Feature for LOTO Compliance

Select SV27 Series models incorporate ROSS's patented L-O-X® (Lockout in the OFF position only) design, supporting OSHA 29 CFR 1910.147 and ANSI Z244.1 lockout/tagout compliance:

Lockable Only in OFF Position: The L-O-X® mechanism prevents inadvertent valve locking in the energized position, eliminating the risk of trapped energy during maintenance operations.

Single-Point Lockout Capability: When integrated into properly designed safety systems, L-O-X® valves enable single-point lockout of entire machine zones, reducing jam clearance time and improving operational efficiency while maintaining worker safety.

Standard Padlock Compatibility: The lockout mechanism accommodates standard safety padlocks and lockout devices, integrating seamlessly with existing LOTO programs without requiring specialized equipment.

Technical Specifications and Performance Data

Valve Function and Configuration Options

The SV27 Series catalog covers multiple valve configurations designed for diverse pneumatic safety applications:

2/2 Directional Control Valves: Two-way, two-position normally closed valves optimized for simple on/off control with external monitoring. Ideal for single-point isolation and basic safety shutdown applications requiring Category 2 PL c certification.

3/2 Single Valve Configurations: Three-way, two-position valves available in both solenoid pilot-controlled and pressure-controlled pilot actuation. These configurations provide supply, exhaust, and output port functionality suitable for cylinder control, air dump applications, and general-purpose pneumatic control with integrated sensing.

Pilot Operated Check Valves: Specialized designs for load holding applications where maintaining cylinder position during safety events is critical. Available in both single (Category 2) and redundant (Category 3) configurations with diagnostic coverage up to 90%.

Redundant Check Valve Assemblies: Dual pilot-operated check valve systems achieving Category 3 PL d certification when properly integrated with monitoring systems, providing the highest level of pneumatic load holding safety.

Actuation Options and Electrical Specifications

Solenoid Pilot Controlled Actuation:

• DC Voltage: 24 VDC standard (14 watts power consumption)
• AC Voltage: 110-120 VAC, 50/60 Hz (87 VA inrush, 30 VA holding)
• Connector Types: 3-pin Mini solenoid connection, 5-pin M12 feedback connection
• Rated for continuous duty operation
• LED indicators available for visual status confirmation

Pneumatic Pressure-Controlled Pilot:

• Internal or external pilot supply configuration
• Pilot pressure must equal or exceed inlet pressure for external supply
• Eliminates electrical infrastructure requirements
• Ideal for Zone 1 hazardous locations or electrically-sensitive environments

Operating Parameters and Environmental Ratings

Pressure Specifications:

• Operating Pressure Range: 40 to 150 psig (2.8 to 10.3 bar) for 2/2 valves
• Pilot Operated Check Valves: 15 to 150 psig (1 to 10 bar)
• Maximum Operating Pressure: 150 psig (10.3 bar)

Temperature Ranges:

• Ambient Temperature: 40°F to 120°F (4°C to 50°C)
• Media Temperature: 40°F to 175°F (4°C to 80°C)
• Suitable for most industrial production environments

Flow Media Requirements:

• Filtered compressed air (40-micron filtration recommended)
• Proper air preparation extends service life and maintains performance
• Compatible with standard industrial compressed air systems

Materials of Construction:

• Valve Body: Cast aluminum alloy for lightweight durability
• Poppet/Spool Elements: Acetal resin and stainless steel combination
• Seals: Buna-N (Nitrile) standard; Fluorocarbon available for specific applications
• Corrosion-resistant materials suitable for industrial atmospheres

Port Sizes and Flow Capacities

The SV27 Series offers comprehensive port sizing to match application requirements:

3/4" Body Size:

• Inlet/Outlet: 3/4" NPT or G thread
• Flow Capacity: 8-9 Cv (7,872-8,856 Nl/min)
• Compact footprint for space-constrained installations

1-1/4" Body Size:

• Inlet: 1-1/4" NPT or G thread
• Outlet/Exhaust: 1-1/2" NPT or G thread
• Flow Capacity: 19-32 Cv (18,696-31,488 Nl/min)
• Mid-range capacity for general industrial applications

2" Body Size:

• Inlet: 2" NPT or G thread
• Outlet/Exhaust: 2-1/2" NPT or G thread
• Flow Capacity: 70-71 Cv (68,880-69,864 Nl/min)
• High-flow applications including large cylinder control and air dump systems

Dimensional Data and Mounting Specifications

Physical Dimensions (vary by model configuration):

• Heights: 8.5" to 18.1" (214 mm to 459 mm)
• Lengths: 5.0" to 10.5" (127 mm to 267 mm)
• Widths: 3.15" to 6.80" (80 mm to 173 mm)
• Weights: 2.1 lbs to 25 lbs (1.0 kg to 11.3 kg)

Mounting Configuration:

• Inline mounting standard across all models
• Orientation: Any position (vertical preferred for optimal performance)
• Threaded port connections for direct piping
• Mounting adapters available for panel or manifold installation

Safety Certifications and Compliance Standards

International Safety Certifications

The SV27 Series carries comprehensive safety agency approvals validating performance in demanding safety applications:

ISO 13849-1 Certification:

• Category 2 PL c (single valve configurations)
• Category 3 PL d (redundant check valve assemblies)
• SISTEMA Library files available for safety circuit calculation
• Mission Time (nop): 7,360 hours

IEC 62061 SIL Rating:

• Safety Integrity Level 2 (SIL 2) certified
• PFHd: 2.35 × 10⁻⁷ (Probability of dangerous Failure per Hour)
• Supports integration into SIL 2 and SIL 3 safety systems

DGUV Certification: German Statutory Accident Insurance (Deutsche Gesetzliche Unfallversicherung) approval confirms compliance with European workplace safety requirements.

CE Marking: Full CE compliance demonstrates conformity with European Economic Area health, safety, and environmental protection standards.

EAC Declaration: Eurasian Conformity certification enables use throughout the Eurasian Customs Union (Russia, Belarus, Kazakhstan, Armenia, Kyrgyzstan).

CSA/UL Certification: North American safety approvals from Canadian Standards Association and Underwriters Laboratories validate electrical safety and performance.

Reliability and Functional Safety Data

B10D Values: 20,000,000 cycles (number of cycles until 10% of population experiences dangerous failure)

MTTFd: 98.15 years (Mean Time to dangerous Failure)

Switch Electrical Life: Rated for excess of 15 million cycles (actual life varies with electrical load and environmental conditions)

Vibration/Impact Resistance: Calculated to BS EN 60068-2-27 standards ensuring performance in dynamic industrial environments

Minimum Operation Frequency: Once per month recommended to ensure proper function and maintain published reliability data

Primary Application Areas

Pneumatic Safety Shutdown Systems: 

The SV27 Series excels in Category 2 safety circuits requiring monitored single-channel architectures. Integration with safety PLCs enables reliable emergency stop functionality with full diagnostic feedback.

Cylinder Position Holding: 

Pilot operated check valve configurations prevent unintended motion of vertically-oriented cylinders during maintenance, material loading, or emergency conditions. Redundant check valve assemblies provide highest safety integrity for critical load holding.

Press Safety Controls: 

SV27 valves integrate into clutch/brake control systems on mechanical power presses, supporting OSHA 1910.217 and ANSI B11.1 compliance for operator protection.

Air Dump and Exhaust Applications: 

Fast-acting exhaust valves rapidly depressurize pneumatic systems during safety events, removing stored energy and preventing unexpected motion.

Material Handling Equipment: 

Automated conveyors, lift tables, and positioning systems benefit from SV27 sensing capabilities that confirm safe states before permitting operator access.

Robotic Work Cells: 

Integration with collaborative robot systems and automated guided vehicles (AGVs) ensures safe air supply control with position feedback for interlocked guarding systems.

Industry-Specific Solutions

Automotive Manufacturing: Body shop transfer systems, press automation, and assembly line applications where reliability and safety feedback are non-negotiable.

Packaging and Converting: High-speed packaging lines, web handling equipment, and material processing systems requiring frequent safety interventions without compromising throughput.

Food and Beverage Processing: Clean-room compatible aluminum construction and sealed design support sanitary processing requirements while maintaining safety integrity.

Aerospace and Defense: Critical assembly and test operations where component damage from unexpected motion could result in catastrophic costs.

Heavy Equipment and Construction Machinery: Mobile and stationary equipment incorporating pneumatic actuation with safety system requirements.

Installation and Integration Guidance

System Design Considerations

Proper Air Preparation: Install upstream filtration (40-micron maximum particle size) and pressure regulation to maintain 40-150 psig operating range. FRL (Filter-Regulator-Lubricator) assemblies recommended for optimal valve life and performance consistency.

Pilot Supply Configuration: When utilizing external pilot supply on pneumatically-actuated models, ensure pilot pressure equals or exceeds inlet pressure to guarantee complete valve shifting. Internal pilot supply simplifies piping but may limit application flexibility.

Electrical Wiring: Route sensor and solenoid wiring per NEC Article 725 for Class 2 circuits. Maintain separation from high-voltage power conductors to prevent electrical noise interference with safety signals. Use shielded cable in high-EMI environments.

Pressure Verification Options: For applications requiring downstream pressure verification, install compatible pressure switches (PS200 Series) or visual pop-up indicators in the integrated 1/8" NPT pressure verification port.

Safety Circuit Integration: Connect DPST switch outputs to safety-rated input modules on certified safety PLCs. Implement proper cross-monitoring logic as required by ISO 13849-1 for Category 2 architectures. Utilize ROSS-provided SISTEMA Library files for accurate safety calculation.

Maintenance and Service Requirements

Inspection Schedule: Examine valve function and perform leak testing at intervals determined by risk assessment, typically every 8 hours for critical load holding applications per ROSS recommendations.

Switch Function Testing: Verify DPST switch operation and electrical continuity during scheduled maintenance windows. Monitor for contact degradation or timing anomalies that may indicate impending failure.

Seal Replacement: Buna-N seals provide extended service life but should be inspected during major overhauls or if leakage develops. Seal kits available from ROSS ensure proper material compatibility.

Environmental Protection: Protect electrical connections from moisture, cutting fluids, and corrosive atmospheres using appropriate sealing and conduit practices. NEMA 4X enclosures recommended for outdoor or wash-down environments.

Catalog Contents and Documentation

This comprehensive SV27 Series catalog provides essential information for valve selection, system design, and ongoing support:

Technical Data Sections

• Complete model numbering system and configuration codes
• Dimensional drawings with mounting hole patterns and port locations
• Flow curves and pressure drop data for accurate system sizing
• Electrical connection diagrams showing pin-out configurations
• Troubleshooting guides and diagnostic procedures

Selection and Ordering Information

• Valve sizing worksheets for flow capacity calculation
• Thread type options (NPT vs. G/BSP)
• Voltage and actuation method selection guidance
• Optional accessory compatibility (pressure switches, visual indicators, mounting brackets)

Complementary Product Information

• Compatible L-O-X® isolation valves for safe air entry assemblies
• Air preparation components (filters, regulators, combination FRL units)
• DM2 Series double valves for Category 4 PL e redundant architectures
• CC4 Series circuit configurations combining multiple valve functions

Engineering Resources

• SISTEMA Library files for functional safety calculations
• Sample P&ID drawings showing typical safety circuits
• Application notes addressing common design challenges
• Certification copies and declaration of conformity documentation

Why Choose ROSS SV27 Series Sensing Valves

Proven Heritage and Innovation

The SV27 Series builds upon ROSS Controls' 50+ year legacy of pneumatic safety innovation. By combining the field-proven reliability of the 27 Series valve platform with modern sensing technology, ROSS delivers a solution that meets contemporary safety standards while maintaining the rugged durability industrial users demand.

Total Cost of Ownership Advantages

Reduced Maintenance: Dirt-tolerant poppet design minimizes unscheduled maintenance and extends service intervals compared to spool-type alternatives.

Diagnostic Feedback: Integrated sensing enables condition-based maintenance strategies, preventing unexpected failures and optimizing maintenance resource allocation.

Energy Efficiency: Near-zero leakage design reduces compressed air consumption and associated utility costs throughout the valve lifecycle.

Regulatory Compliance: Comprehensive safety certifications eliminate engineering uncertainty and reduce time-to-market for machine builders.

Global Support and Availability

ROSS Controls maintains worldwide distribution networks ensuring rapid product availability and local technical support. Applications engineering assistance helps optimize system designs, while customer service teams expedite replacement part delivery minimizing production interruptions.

Download Your SV27 Series Catalog Today

Access the complete ROSS SV27 Series product catalog to obtain:

• Full technical specifications for all valve configurations
• Detailed dimensional drawings and mounting data
• Performance curves and flow capacity charts
• Electrical connection diagrams and wiring specifications
• Model numbering guide and ordering information
• Safety certification documentation
• Application examples and system design guidance

Whether you're designing a new pneumatic safety system, upgrading existing equipment to meet current safety standards, or seeking reliable replacement components, the SV27 Series catalog provides the comprehensive information needed for successful project execution.

File Format: PDF (searchable, printable)
File Size: Optimized for fast download
Language: English
Document Code: ROSS-SV27-22_EN

For additional technical assistance, custom configuration guidance, or application-specific recommendations, contact ROSS Controls technical support or your local authorized distributor.

DM2 Series Control Reliable Valves: For applications requiring Category 4 PL e safety levels, consider ROSS DM2 Series internally monitored double valves offering the highest safety integrity through redundant valve elements with crossflow monitoring.

15 Series L-O-X® Isolation Valves: Create complete safe air entry assemblies by combining SV27 sensing valves with manually-operated L-O-X® lockout valves for OSHA-compliant energy isolation.

Pressure Switches and Visual Indicators: Enhance safety system functionality with compatible downstream pressure verification devices ensuring complete energy dissipation confirmation.

Industry Standards and Regulations References

• ISO 13849-1: Safety of machinery - Safety-related parts of control systems
• IEC 62061: Functional safety of electrical/electronic/programmable safety-related systems
• OSHA 29 CFR 1910.147: The control of hazardous energy (lockout/tagout)
• ANSI Z244.1: Alternative methods for the control of hazardous energy
• OSHA 1910.217: Mechanical power presses safety requirements
• ANSI B11.1: Safety requirements for mechanical power presses

Frequently Asked Questions

What safety category does the SV27 Series achieve?
Single valve configurations meet ISO 13849-1 Category 2 PL c and IEC 62061 SIL 2. Redundant check valve assemblies achieve Category 3 PL d when properly integrated.

Can SV27 valves be used in hydraulic applications?
The SV27 Series is designed specifically for filtered compressed air applications. For hydraulic safety solutions, consult ROSS hydraulic product offerings.

What is the difference between internal and external pilot supply?
Internal pilot supply uses inlet pressure to shift the valve, simplifying piping. External pilot supply allows independent control pressure, offering greater application flexibility.

How do I integrate SV27 valves with my safety PLC?
Connect the DPST switch outputs to safety-rated input modules. Utilize ROSS-provided SISTEMA Library files for accurate safety circuit calculations and verification.

What maintenance is required?
Perform functional testing and leak inspection per your risk assessment schedule. ROSS recommends testing every 8 hours for critical load holding applications. Inspect electrical connections and verify switch operation during scheduled maintenance.