Norgren S/522 Non-return Valve - G1/2 Port, Heavy Duty
Part Number: S/522
Quick Summary
Norgren S/522 non-return valve provides one-way flow control for compressed air systems. This compact solution reduces backflow and pressure fluctuations that lead to downtime and wear on downstream equipment. For engineers and procurement teams, reliability and predictable performance matter, and this valve delivers that. It aligns with common industry standards, including CE conformity and SIL/IP considerations where applicable, as detailed in the datasheet. With a brass body, nitrile elastomer seals, and operation from -20 to 80 C at 0.3 to 16 bar, it offers long service life in harsh environments while keeping installation straightforward and parts readily available from the S/520 Martonair family.
Product Information
Extended Description
S/522 Norgren: Allows free flow in one direction only | Simple reliable design | High operating pressure and temperature | Spares kit available
Medium
Compressed air
Operating Temperature
-20 ... 80 °C, -4 ... 176 °F
Operating Pressure
0.3 ... 16 bar, 4 ... 232 psi
Port Size
G1/2
Materials - Body
Brass
Materials - Elastomers
Nitrile rubber
Dimensions - Height
27 mm
Dimensions - Length
27 mm
Dimensions - Width
76 mm
Weight
0.21 kg
Country of Origin
China
Range
S/520 Series
Series
Martonair
Brand
IMI Norgren
Feature: Brass body construction provides robust durability and corrosion resistance in demanding environments. Benefit: Extends service life in moisture and dust-prone facilities, reducing replacement cycles and overall operating costs. Application: Heavy-duty pneumatic circuits in automated manufacturing lines. Long-tail keyword: brass-bodied valve. Feature: Nitrile elastomer seals deliver reliable sealing across a wide temperature band. Benefit: Maintains consistent backflow protection even as ambient conditions vary, improving system stability in packaging and machine tools. Application: Sealed pneumatic manifolds. Long-tail keyword: nitrile rubber seals. Feature: Port size G1/2 and compact footprint enable easy retrofits and quick installation. Benefit: Minimizes downtime and simplifies integration with existing piping, manifolds, and fittings. Application: Retrofit projects and OEM assemblies. Long-tail keyword: G1/2 port valve. Feature: Operating range 0.3–16 bar and -20 to 80 C supports high-pressure air lines without risk of unintended backflow. Benefit: Improves safety margins and protects downstream devices in high-demand cycles. Application: Pressing, clamping, and tool actuators. Long-tail keyword: wide operating pressure range. Feature: Spares kit availability ensures fast maintenance and minimal downtime. Benefit: Reduces total cost of ownership and keeps production lines running. Application: Maintenance planning for S/520 Series Martonair range. Long-tail keyword: spares kit for Norgren valves. Feature: Simple, reliable design with one-way flow control reduces leak paths and simplifies diagnostics. Benefit: Less complex fault tracing and faster repairs, increasing overall line efficiency. Application: Pneumatic control loops in robotics and pick-and-pack systems.
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FAQs
Yes. The S/522 uses a G1/2 port size, which is a common standard for pneumatic connections. When installing, ensure mating fittings and seals match the G1/2 thread and verify alignment to avoid cross-threading. A spare kit is recommended to minimize downtime during retrofit projects.
The valve operates from 0.3 to 16 bar (4 to 232 psi) and withstands ambient temperatures from -20 to 80 C (-4 to 176 F). This makes it suitable for most industrial compressed-air circuits while maintaining reliable one-way flow control.
Ideal for heavy-duty pneumatic circuits in automation, machine tools, and packaging lines, the S/522 prevents backflow to protect compressors and actuators, improves cycle consistency, and reduces leak-induced wear across critical air paths in the S/520 Series Martonair family.
Industrial valves like the S/522 commonly carry CE conformity; SIL and IP certifications are regionally applicable and should be confirmed in the newest datasheet. Always verify current certification status with the datasheet and supplier documentation before regulatory audits or hazardous-area installations.
A dedicated spares kit simplifies maintenance and reduces downtime. The brass body and nitrile seals endure frequent cycle operation, contributing to lower replacement costs and improved line uptime. Pairing the valve with the S/520 Series Martonair lineup supports consistent stocking, longer service intervals, and a favourable return on investment for OEMs and end users.