B68G-NNT-MR3-NSN | Norgren | Olympian Plus Filter/Regulator

The Norgren B68G-NNT-MR3-NSN is a high-capacity filter/regulator from the Olympian Plus series, specifically configured for high-pressure industrial applications. This model is distinguished by its Non-Relieving diaphragm and T-bar adjustment, making it ideal for systems where downstream pressure must be maintained or where venting of gases into the atmosphere is not permitted.

Technical Specifications

Key Component Codes

• T-bar (T): Provides the necessary leverage to adjust the heavy-duty spring required for the 17-bar pressure range.

• Non-Relieving (N): Unlike standard models, this unit does not vent downstream air when the set pressure is reduced. It is preferred for applications involving neutral gases or where pressure stability in a dead-end circuit is critical.

• Standard Bowl (G/R): Features a large capacity with a clear indicator to monitor condensate levels.

Installation Guidelines

• Yoke Requirement: This is a "basic" unit (No Yoke). To install, it must be plugged into a pre-installed B68 Olympian Plus Yoke. This allows for "quarter-turn" installation and removal without breaking the pipework.

• Flow Orientation: Verify the direction of airflow marked on the body. Install vertically with the bowl facing down.

• Downstream Pressure Relief: Because this is a Non-Relieving model, if you lower the pressure setting while the system is closed, the downstream pressure will not drop automatically. You must manually vent the downstream air to reach the new lower set point.

• Maintenance Space: Ensure at least 150mm of clearance below the bowl for manual draining and filter element replacement.

Frequently Asked Questions (FAQs)

When should I use a Non-Relieving diaphragm?

Non-relieving regulators are used when you want to avoid air venting from the regulator body (e.g., in cleanrooms or when using inert gases) or when the application requires the downstream pressure to remain "trapped" until consumed.

What is the benefit of the 40µm element?

The 40µm element provides excellent flow rates with minimal pressure drop, making it the standard choice for general-purpose industrial air tools and machinery.

Can I convert this to an automatic drain?

Yes, the manual drain can be replaced with a Norgren auto-drain kit if the unit is located in a hard-to-reach area or if high moisture levels are present.

What gauge should I use?

Since this unit supports up to 17 bar (250 psig), ensure you select a gauge with a scale that exceeds 17 bar (typically a 0-25 bar or 0-400 psi gauge) for accurate monitoring.