Norgren V68H-NND-RMN Pressure Relief Valve - 20 bar
Part Number: V68H-NND-RMN
Quick Summary
Norgren V68H-NND-RMN pressure relief valve is designed to protect compressed air systems from over-pressurisation in industrial automation lines. Inadequate relief response can lead to tool damage, unplanned downtime, and rising maintenance costs. While certification needs vary by region, CE marking, SIL safety considerations, and IP protection ratings are commonly referenced for air-system components. This model delivers adjustable relief from 1 to 10 bar, supports up to 20 bar inlet, and uses sturdy aluminium and plated steel components for enduring performance. For procurement, easy compatibility with optional yoke assemblies and service kits helps optimize lifecycle cost and simplify maintenance in busy production environments.
Product Information
Extended Description
V68H-NND-RMN Norgren: Olympian relief valves protect compressed air systems from over-pressurisation | High relief capacity, sensitive and accurate | Threaded relief port for silencer or piped exhaust
Medium
Compressed air
Operating Temperature
-20 ... 80 °C, -4 ... 176 °F
Port Size
Without Yoke
Gauge Port
Rc1/8
Maximum Inlet Pressure
20 bar
Outlet Pressure Adjustment
1 ... 10 bar, 15 ... 145 psi
Materials - Adjusting Knob
Plated steel
Materials - Body
Aluminium
Materials - Bonnet
Aluminium
Materials - Elastomers
Synthetic rubber
Dimensions - Height
232 mm
Dimensions - Length
115 mm
Dimensions - Width
91 mm
Weight
1.21 kg
Country of Origin
Czechia
Range
V68H
Series
Olympian Plus
Brand
IMI Norgren
Y68A-6GN-N1N
Yoke assemblies
1581-90
Tamper Resistant Cover
Y68A-6GN-N2N
Yoke assemblies
18-001-979
Wall Bracket
V68H-KIT
Service kit V68H
MB008B
Quietaire heavy duty silencer male, R1
T40B2800
Quietaire sintered bronze silencer, R1/4
Feature: Adjustable outlet pressure from 1 to 10 bar with 15 to 145 psi range. Business impact: enables precise relief control, reduces energy waste, and protects downstream actuators. Application: use on automated lines and pneumatic circuits where pressure windows must be tuned for peak performance without overshoot. Feature: Maximum inlet pressure of 20 bar. Business impact: provides reliable protection against pressure spikes, reducing risk of equipment damage and unplanned downtime. Application: suitable for CNC tooling feeds, robotic grippers, and central air systems in manufacturing. Feature: Medium and temp range (-20 to 80 °C) ensure compatibility with standard plant environments. Business impact: broadens deployment across varying climates and processes, lowering replacement cycles. Application: automotive, packaging, and general plant automation. Feature: Aluminium body with bonnet and plated steel adjusting knob, elastomer seals.Business impact: ensures durability, corrosion resistance, and dependable adjustment under heavy use. Application: long-life installation in harsh industrial spaces. Feature: Port size Rc1/8, without yoke design, with optional accessories Yoke assemblies and service kit V68H-KIT. Business impact: modular integration and easy retrofit or maintenance. Application: retrofit projects and customized panel installations. Feature: Silencers optional MB008B or T40B2800 for noise reduction. Business impact: quieter operation reduces operator fatigue and regulatory noise exposure. Application: press rooms, packaging lines, and high-cycle equipment.
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FAQs
Yes. The base valve is specified without a yoke, but it is designed for use with Norgren Yoke assemblies (Y68A-6GN-N1N or Y68A-6GN-N2N). When retrofitting, confirm Rc1/8 gauge port compatibility, mounting clearance, and consider the Service Kit V68H-KIT to simplify maintenance and ensure reliable operation in existing panels.
The valve provides an adjustable outlet pressure from 1 to 10 bar (approximately 15 to 145 psi) with a maximum inlet pressure of 20 bar. It handles compressed air applications across -20 to 80 °C. These specs support precise protection for cylinders, actuators, and robotics in standard industrial environments.
Ideal for automated manufacturing lines, pneumatic tooling, robotics, and packaging equipment. The V68H-NND-RMN supports reliable over-pressurisation protection in central air systems and distributed actuator networks, helping maintain uptime, reduce tool wear, and ensure consistent performance in automotive, consumer electronics, and general industrial assembly environments.
Certification specifics depend on regional requirements and the application. Common references include CE marking for Europe and appropriate IP protections for enclosure environments, plus SIL considerations in safety-related circuits. Always verify the exact certifications with your supplier and ensure the installation adheres to local regulatory and safety standards.
Use the V68H-KIT service kit for periodic maintenance, inspect elastomer seals for wear, and verify the adjusting knob and port connections during routine line checks. Consider integrating with optional silencers MB008B or T40B2800 to reduce noise. Regular upkeep minimizes leakage, maintains accurate relief settings, and extends the valve’s lifecycle in high-demand production lines.