Key Advancement: Achieve 99% diagnostic coverage with integrated monitoring—enabling Category 2 compliance in applications that previously required redundant valve systems. This reduces system complexity, footprint, and total cost of ownership while maintaining the highest safety standards.

Why SV27 Sensing Valves Solve Your Safety Engineering Challenges

For Safety-First Manufacturing Leaders

Your responsibility is absolute: prevent workplace injuries and maintain compliance across every operation. SV27 valves directly support this mission through:

• Verified Safe State Confirmation: Integrated DPST switch eliminates guesswork about valve position. Your control system knows with certainty whether the valve is operating correctly or if a fault has occurred.
• TÜV Certification & Functional Safety Documentation: Full compliance with ISO 13849-1:2015 (PL c) and IEC 61508/IEC 61511 (SIL 2) standards provides the documentation your auditors, insurance carriers, and executives demand.
• 99% Diagnostic Coverage: Early fault detection prevents catastrophic failures. You're no longer relying on reactive incident reports—you're actively monitoring the health of critical safety systems.

For Plant Operations & Reliability Teams

Downtime costs are unforgiving. SV27 valves deliver operational excellence:

• Poppet Design Excellence: Self-cleaning, dirt-tolerant construction means the valve maintains performance even in harsh industrial environments. Quick response and high flow capacity keep your production running smoothly.
• Proven in Harsh Environments: Field-proven across automotive press lines, metal forming operations, plastic molding facilities, and assembly plants worldwide. The poppet design delivers superior reliability compared to spool-based alternatives.
• Reduced Maintenance Burden: Integrated monitoring enables predictive maintenance—you address problems before they become production emergencies.

For Design & Automation Engineers

Building the next generation of machinery requires components that integrate seamlessly:

• Flexible Actuation Options: Choose between solenoid pilot control (24V DC or 110-240V AC) or pressure-controlled operation based on your circuit requirements. No system rework needed.
• Compact Dimensions with Easy Integration: Inline mounting, standard NPT/G threading, and integrated electrical connectors simplify system design. CAD models and documentation support rapid integration.
• Enhanced Diagnostics Integration: Standard DPST switch provides dual-channel feedback—both normally open (NO) and normally closed (NC) contacts enable redundant monitoring strategies.

For Procurement & Supply Chain Leaders

You need suppliers who understand total cost of ownership:

• Global Availability: 100+ authorized distributors worldwide ensure rapid delivery and consistent supply. Long-established product lifecycle minimizes obsolescence risk.
• Multiple Configurations: 9 body sizes with multiple port options (3/4, 1, 1-1/4, 2, 2-1/2) and solenoid/pressure pilot variants reduce inventory complexity while supporting diverse applications.
• Comprehensive Aftermarket Support: Replacement parts, service kits, and technical guidance available through ROSS Controls' worldwide network.

Complete Technical Specifications & Performance Data

Standard Operating Parameters

Safety Certifications & Compliance

The SV27 Series achieves industry-leading safety credentials:

• Safety Integrity Level (SIL 2): TÜV Rheinland certified per IEC 61508 and IEC 61511
• Performance Level (PL c): EN ISO 13849-1:2015 with application-specific diagnosis
• Functional Safety Category: Up to CAT 3, PL e in redundant configurations
• Diagnostic Coverage: 99% DC (achieved through safety switch status monitoring)
• Mean Time To Failure Data (MTTFD): 98.15 years (nop: 7,360 cycles)
• Probability of Dangerous Failure (PFHD): 2.35×10⁻⁷ per hour
• B10D Rating: 20,000,000 cycles

Electrical Specifications

Integrated DPST Switch:

• Maximum current/voltage: 2.5 A / 120 volts AC
• Minimum: 50 mA / 24 volts DC
• Dual-channel contacts: Both NO and NC
• Positively-driven, force-guided design

Solenoid Pilot Controlled Valves:

• 24V DC: 14 watts per solenoid (continuous duty)
• 110-120V AC, 50/60 Hz: 87 VA inrush, 30 VA holding
• 230-240V AC, 50/60 Hz: Full continuous duty rating

Pressure Controlled Valves:

• No electrical solenoid requirement
• Ideal for standalone pilot pressure applications
• Integral feedback via DPST switch remains standard

Flow Performance & Sizing Data

The SV27 Series delivers impressive flow capacity across all body sizes:

All flow capacities verified for 1-2 and 2-3 exhaust paths. Consult technical documentation for specific application requirements.

Advanced Features That Deliver Real-World Value

Integrated Position Sensing

Unlike blind exhaust valves, SV27 sensing valves know their own operating state. The integrated DPST switch actuates based on valve position:

• For 3/4" and 1-1/4" bodies: Switch activates whenever valve is NOT in normal home position—meaning any unexpected spool movement immediately triggers an alarm.
• For 2" bodies: Switch activates only when valve IS in normal home position—preventing accidental emissions or pressure escapes.

Practical Benefit: Your PLC or safety controller receives real-time feedback, enabling advanced diagnostics, predictive maintenance alerts, and automatic system shutdown if the valve fails.

Pressure Verification Port (PV)

The optional 1/8" NPT pressure verification port provides enhanced safety confirmation:

• Visual Pressure Indicator (Model 988A30): Pop-up pin confirms pilot pressure in real-time. Operator can verify with visual inspection.
• Electrical Pressure Switch (Model 586A86): Factory preset at 5 psi falling edge. Provides electrical feedback to confirm pressure release.

Why This Matters: Category 2 applications require confirmation that pressure has actually been released. These optional accessories transform SV27 into a complete energy verification system.

Poppet Design Advantages

The poppet construction delivers benefits that spool designs cannot match:

• Near-Zero Internal Leakage: Direct seat sealing minimizes compressed air waste—reducing energy costs and environmental impact.
• Dirt Tolerance: Poppet design is self-cleaning and wear-compensating. Even in contaminated air systems, the valve maintains consistent performance.
• Quick Response: Minimal moving mass enables rapid opening/closing cycles—critical for safety applications requiring fast energy isolation.
• High Flow Capacity: Generous flow paths deliver maximum throughput without pressure drop penalties.

Safety Application Categories & Compliance

Category 2 Safe Shutdown Applications

SV27 valves serve as the controlled dump/exhaust element in Category 2 safety circuits. Application examples include:

• Power Press Safety: Solenoid-controlled exhaust during tool change or maintenance lockout
• Injection Molding: Emergency pressure release preventing mold separation on detection circuit trigger
• Metal Stamping: Rapid air dumping for slide retraction in clutch-brake systems
• Assembly Automation: Controlled actuation disable when safety light curtain is triggered

Critical Design Feature: The positively-driven DPST switch eliminates relay diagnostics and provides direct proof of valve state—supporting Category 3 redundant architectures when properly integrated with your control system.

Functional Safety Integration

Proper SV27 integration requires:

1. Reliable Actuation Signal: Solenoid pilot supply must be monitored and verified. Lost pilot pressure = lost safety function capability.
2. Switch Monitoring: Your safety controller must continuously monitor both NO and NC switch contacts for fault conditions.
3. Load Holding Verification: ROSS recommends functional testing of switch and sealing every 8 hours for load-holding valve applications (per specifications).
4. Pilot Supply Integrity: For pressure-controlled models, ensure pilot supply meets minimum operating pressure and isn't contaminated.

Available Body Sizes, Port Configurations & Ordering Guide

Body Size Options

Actuation Type Selection

Solenoid Pilot Controlled – Choose when:

• Electronic control signals are available from your PLC or safety controller
• 24V DC or 110-240V AC power is reliably available
• You need flexible timing control and integration with automated systems
• Multiple solenoids enable additional control logic options

Pressure Controlled – Choose when:

• Pilot air supply is available and reliable
• Standalone operation without electrical control is preferred
• System architecture uses pneumatic logic instead of electronic control
• Simpler integration without solenoid power supply requirements

Model Number Configuration

Standard Format: SV27-[Port]-[Size]-[Actuation]-[Voltage]

Example Decodings:

• SV27NC305407PSAA1A: SV27 Series, normally closed, 540 body (3/4" ports), solenoid pilot, 24V DC
• SV27DC307707PSAA1A: SV27 Series, normally closed, 770 body (1-1/4" ports), solenoid pilot, 24V DC

Material Construction & Environmental Resistance

SV27 valves are engineered for demanding industrial environments:

Temperature Operating Range: -4°C to +50°C ambient / -4°C to +80°C media

Electrical Connectors & Integration Options

Solenoid Connector Specifications

• Standard Configuration: MINI 3-pin connector with color-coded pinout
• Maximum Rating: 2.5 A / 120 VAC
• Pin Assignment: Green/Yellow (Ground), Blue, Brown
• Alternative: M12 5-pin connector available for harsh environments

Sensing Switch Connector Specifications

• Standard Configuration: MINI 3-pin for sizes 3/4" and 1-1/4"
• Size 2 Configuration: M12 5-pin connector
• Maximum Rating: 2.5 A / 120 VAC
• Contact Type: Dual-channel (NO and NC)
• Signal Integrity: Force-guided positive-break design ensures safety-rated operation

Prewired Cable Kits

ROSS offers convenient prewired connector solutions:

• Solenoid Kits (Model 2239H77, 2240H77): MINI 3-pin to flying leads (4m or 10m options)
• Sensing Switch Kits (Model 2241H77, 2242H77): M12 5-pin to flying leads (4m or 10m options)
• Combined Kits: Simultaneous solenoid + sensing switch integration available

Optional Accessories & Customization

Energy Release Verification Equipment

Visual Pressure Indicator (Model 988A30)

• Installs in 1/8" NPT pressure verification port
• Visual pop-up pin confirms pilot pressure
• No electrical requirement, simple mechanical design
• Thread: 1/8" NPT

Electrical Pressure Switch (Model 586A86)

• Factory preset: 5 psi falling edge
• Connector: DIN EN 175301-803 Form A
• Installation: Pressure sensing port or downstream location
• Provides electrical feedback to safety controller

Manual Override Options

For solenoid pilot models, multiple override configurations available:

All buttons: Metal construction, spring-returned, flush rubber standard.

Solenoid Indicator Light Kits

Visually verify solenoid energization status:

• 24V DC: Model 862K87-W
• 110-120V AC (50-60 Hz): Model 862K87-Z
• 230V AC (50-60 Hz): Model 862K87-Y

Lights illuminate when solenoid is energized, providing immediate operational feedback.

Exhaust Silencers & Flow Control

ROSS offers multiple silencer options for noise reduction:

• Standard Silencers: Aluminum construction, 0-290 psig rating, ports 1/8" through 2"
• Flow Capacity: Up to 104 Nl/min (Cv) for 2-1/2" port sizes
• Hex Nipple Connectors: Steel or stainless steel, multiple sizes available
• Critical Feature: Must have flow capacity ≥ valve exhaust capacity to prevent backpressure issues

Dimensional Data & Installation Planning

Solenoid Pilot Controlled Valve Dimensions

3/4" Body:

• Overall height: 9.6" (244mm)
• Solenoid height from valve surface: 5.7" (145mm)
• Connector diameter: Ø 0.34" (8mm)
• Footprint width: 3.25" (83mm)

1-1/4" Body:

• Overall height: 12.0" (305mm)
• Extended reach for larger flow paths
• Increased mounting footprint: 6.63" × 4.50" (168mm × 114mm)

2" Body:

• Maximum overall height: 11.8" (300mm)
• Largest external profile: 6.33" × 5.80" (161mm × 147mm)
• Connector diameter: Ø 0.53" (13.5mm)

Downloadable CAD Models: Complete 3D models available for all sizes to support accurate system layout and 3D design integration.

Pressure Controlled Valve Dimensions

Pressure-controlled variants are more compact (no solenoid extension):

• 3/4" Body: 6.4" (163mm) height – compact footprint
• 1-1/4" Body: 8.8" (222mm) height
• 2" Body: 11.8" (300mm) height with integrated 1/4" signal port

Downloadable Resources & Documentation

This comprehensive catalog includes:

• Complete Specifications: Operating parameters, electrical data, safety certifications
• Performance Curves: Flow vs. pressure drop characteristics for all body sizes
• Dimensional Drawings: Detailed millimeter/inch specifications for 3D CAD integration
• Wiring Diagrams: Standard DPST switch configurations and integration examples
• Model Number Selector: Easy reference tool for quick part number generation
• Safety Documentation: TÜV certificates, functional safety data, compliance proofs
• CAD Model Files: Compatible with major CAD platforms for design integration
• Certification Bulletins: ISO 13849-1, IEC 61508/61511 compliance documentation

ROSS Controls Global Support & Partnership

Worldwide Distribution & Rapid Availability

ROSS Controls operates a global network supporting SV27 valve distribution:

• 100+ Authorized Distributors: Strategically located worldwide for rapid fulfillment
• Multiple Regional Headquarters: Europe, Americas, Asia-Pacific ensuring local expertise
• Inventory Stocking: Major distributors maintain SV27 stock for urgent requirements
• Emergency Support: 24/7 technical hotlines available across multiple continents

Application Engineering & Design Support

• ROSS/FLEX Custom Solutions: Flexible design programs supporting application-specific requirements
• On-Site System Design: Field engineers available for complex safety system integration
• CAD Integration Support: Engineering teams assist with detailed design incorporation
• Performance Verification: System testing and validation support before production deployment

Comprehensive Aftermarket Services

• Service Kits & Repair Parts: Full availability across worldwide network
• Warranty Support: Standard 1-year warranty; extended programs available
• Technical Training: On-site training for maintenance, operations, and safety teams
• Preventive Maintenance Programs: Scheduled service partnerships for reliability optimization

Why Leading Manufacturers Specify SV27 Sensing Valves

The ROSS Difference

100+ Years of Pneumatic Safety Excellence

ROSS Controls was founded in 1921 and has spent a century perfecting pneumatic valve technology. SV27 represents the culmination of this legacy: proven engineering combined with modern safety standards.

Factory-Tested Reliability

Every SV27 valve undergoes rigorous testing before shipment:

• Functional verification of solenoid operation (where applicable)
• DPST switch continuity and force-guided verification
• Pressure seal testing for internal leakage detection
• Visual inspection for manufacturing defects

Application-Proven Performance

SV27 valves operate in some of the world's most demanding manufacturing environments:

• Automotive Press Lines: High-frequency dump cycles, critical safety certification
• Metal Forming: Harsh contaminated air, extreme reliability demands
• Injection Molding: Rapid response requirements for mold safety systems
• Food & Beverage: Hygiene standards with integrated electronic feedback
• Semiconductor Assembly: Ultra-precise control with certification requirements

Regulatory & Certification Leadership

SV27 Series certifications reflect ROSS's commitment to safety:

• TÜV Rheinland Certification: Third-party validation of safety functions
• ISO 9001:2015: Quality management system certification
• Functional Safety Standards: Full IEC 61508/61511 compliance documentation
• Regulatory Support: Documentation packages supporting OSHA audits and insurance verification

Implementation & Commissioning Guidance

Pre-Installation System Requirements

Before installing SV27 valves in your system:

1. Air Supply Preparation:
   • Install 5-micron minimum filtration upstream of valve
   • Verify supply pressure meets minimum 40 psig operating requirement
   • Confirm pilot supply pressure equals or exceeds inlet pressure
2. System Pressure Verification:
   • Design system for 40-150 psig operating range
   • Never exceed maximum 150 psig specification
   • Regulate down if source pressure exceeds maximum
3. Solenoid Power Supply:
   • 24V DC models: 14 watts per solenoid, continuous duty rated
   • 110-120V AC: 87 VA inrush, 30 VA holding capacity
   • Verify dedicated power circuit with appropriate protection
4. Electrical Integration:
   • Connect both DPST switch contacts (NO and NC) to safety controller
   • Use redundant monitoring circuit for Category 2 compliance
   • Implement watchdog timers for fault detection

Functional Safety Testing

ROSS recommends the following maintenance schedule:

• Monthly: Manual override actuation to verify mechanical function
• Every 8 Hours (Load Holding): Switch function and seal verification for applications where valve holds load
• Quarterly: Complete system diagnostic review and sensor verification
• Annual: Full service inspection and replacement of seals/wear items

Common Applications & Success Stories

Power Press Safety Systems

Scenario: Large automotive supplier operating 50+ stamping presses across two facilities

Challenge: Legacy clutch-brake systems relied on solenoid dump valves without position feedback. Multiple incidents of incomplete pressure release created worker safety concerns.

Solution: Upgraded to SV27 sensing valves with integrated DPST monitoring. Control system now receives real-time confirmation that pilot pressure has been dumped and load is held by brake. Technicians can verify system state without manual inspection.

Result:

• 100% compliance with TÜV Category 2 requirements
• Incident rate dropped to zero following implementation
• Maintenance burden reduced—predictive alerts prevent failures

Injection Molding Safety Integration

Scenario: Mid-sized plastics manufacturer with 30-cavity mold safety systems

Challenge: High production volumes required rapid cycle times. Traditional solenoid exhaust valves couldn't provide feedback on pressure release status, creating quality control uncertainty.

Solution: SV27 integrated sensing with optional pressure verification switch. Electronic monitoring prevents cavity separation until pressure release is confirmed.

Result:

• Reduced defect rate by 15% through improved pressure control
• Safety certification simplified during facility audits
• Maintenance costs down 20% due to early fault detection

Engineering Questions Answered

Q: Can SV27 be used in redundant Category 3 configurations?

A: Yes. When configured with proper dual-channel monitoring (both NO and NC switch contacts) and integrated with a Category 3 rated safety controller, SV27 can support Category 3, PLd safety levels. Consult technical documentation and application engineering for specific circuit design.

Q: What's the difference between solenoid pilot and pressure-controlled actuation?

A: Solenoid pilot models use an electrical signal to control pilot air flow, enabling flexible timing and integration with electronic control systems. Pressure-controlled models use pilot pressure source directly, ideal for standalone operation or pneumatic logic circuits. Both achieve the same safety ratings.

Q: How does the integrated DPST switch improve safety?

A: The positively-driven DPST switch provides dual-channel feedback (NO and NC contacts). Your safety controller monitors both channels simultaneously. Loss of switch signal or contradictory switch states immediately triggers a fault—preventing masked failures.

Q: Are CAD models available for design integration?

A: Yes. Complete 3D CAD files are available for all body sizes and configurations. Models support STEP, IGES, and native format exports compatible with major CAD platforms including SolidWorks, AutoCAD, and Catia.

Q: What's the typical delivery timeframe?

A: Stock items through authorized distributors typically ship within 5-10 business days. Custom configurations or large volume orders may require 4-6 weeks. Contact your local ROSS distributor for specific delivery schedules.

Download Your Complete SV27 Technical Reference

This PDF catalog contains everything required for specification, design, procurement, and commissioning:

• Complete Parts List with all body sizes and configurations
• Technical Performance Data including flow curves and pressure ratings
• Safety Certifications and functional safety documentation
• Dimensional Specifications for CAD integration and panel layout planning
• Electrical Wiring Diagrams for solenoid and switch integration
• Optional Accessories Catalog with pressure switches and indicators
• Application Examples demonstrating safe shutdown circuit design

Recommended for:

• Safety engineers designing compliant dump/exhaust circuits
• Procurement professionals evaluating valve specifications
• OEM design engineers selecting components
• Maintenance teams planning equipment upgrades
• System integrators building automated machinery
• Facility managers implementing safety improvements