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Gast 8AM-NRV-5B Air Motor

Gast 8AM-NRV-5B Air Motor

A reversible, 5 HP (3.7 kW) rotary vane air motor featuring a 4-vane design and a standard Face Mount. It is an intrinsically safe, cool-running alternative to electric motors, ideal for hazardous environments and high-ambient temperatures.

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Description

The 8AM-NRV-5B is built for industrial durability. Its 4-vane design provides a balance of high-speed efficiency and reliable starting torque. Because it is powered by compressed air, it is inherently ATEX and CE certified for use in explosive atmospheres (Group II, Cat 2), as it generates no electrical sparks.

A key physical distinction of the -5B model is its 3/4″ (19.05 mm) keyed shaft and face-mounting holes (3.88″ bolt circle), which differ from the larger NEMA 145TC flange found on the -28A model.

Brand

GAST

GAST 

Since 1921, Gast Manufacturing, Inc. has been a leader in the design and manufacturing of quality air-moving products. We specialize in offering cost effective solutions for a wide variety of industries including industrial manufacturing, healthcare, and environmental cleanup applications.

Features

  • Face Mount Design: Optimized for direct mounting to bulkheads, custom machinery frames, or specialized agitator stands.
  • 4-Vane Configuration: The standard industrial setup for efficient power and high RPM stability.
  • Variable Speed & Torque: Speed can be controlled from 300 to 2,500 RPM by simply regulating the air pressure or volume.
  • Cool Running: The expansion of air within the motor naturally cools the unit, allowing it to withstand ambient temperatures up to 121°C (250°F).
  • Stall-Safe: Can be overloaded or stalled indefinitely without the risk of overheating or internal damage.
  • Reversible Rotation: A 4-way valve in the air line allows the motor to switch between clockwise and counter-clockwise rotation instantly.

Specifications

FeatureSpecification
Maximum Power5.0 hp (3.73 kW)
Maximum Speed2,500 RPM
Max Air Consumption175 CFM ($297 m^3/h$)
Maximum Torque185 lb-in (20.9 Nm)
Starting Torque @ 80 psi117 lb-in (13.2 Nm)
Max Operating Pressure100 psi (7 bar)
Port Size1/2″ NPT
Shaft Diameter0.75 in (3/4″)
Weight28 lbs (12.7 kg)

Applications

  • Custom Agitators: Face-mounting allows the motor to be bolted directly to the top of chemical or paint mixing tanks.
  • OEM Machinery: Frequently integrated into specialized industrial equipment where a standard NEMA or foot mount won’t fit.
  • Hazardous Pumping: Driving pumps in refineries or chemical plants where combustible gases are a constant concern.
  • High-Heat Material Handling: Powering equipment in foundries or near industrial kilns where electric motors would fail.
  • Wastewater Treatment: Operating in damp, corrosive environments where pneumatic power is more durable than electrical.

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