SAM BU Industrial SAM 4.5 VP 85 Air Motor

SAM BU Industrial SAM 4.5 VP 85 Vane Type Air Motor

The SAM BU Industrial SAM 4.5 VP 85 is a rotary vane pneumatic air motor engineered specifically for hazardous, moisture-dense, and demanding marine deck environments. Manufactured by SAM BU Industrial Co., Ltd. (South Korea), this compact drive unit delivers 4.5 PS (approx. 3.3 kW / 4.4 HP) of continuous pneumatic output power.

The SAM 4.5 VP 85 operates at a rated output speed of 850 RPM under standard working pressure (6 kg/cm² / 0.59 MPa / 85.3 psi). Operating on compressed air without electrical coils or brushes, it is inherently spark-free and explosion-safe. It is widely deployed across merchant shipping fleets, offshore platforms, gas carriers (LNG/LPG), chemical parcel tankers, and heavy industries for driving deck winches, accommodation ladder hoists, pilot hoists, fuel valve actuators, and pneumatic capstans.

Model Details

• Manufacturer: SAM BU Industrial Co., Ltd. (Pusan/Busan, South Korea)
• Series: SAM Series Pneumatic Vane Motors (Brake / Non-Brake / Standard Control Valve variants)
• Full Base Model: SAM-4.5VP
• Speed/Gear Designation: 85 (Denotes 850 RPM nominal rated output / 1:4.4 reduction ratio)
• MPN / Exact Order Code: SAM-4.5VP-85 (Alternate: SAM 4.5 VP / 85)

Features

1. Integrated 1:4.4 Speed Reduction & High Starting Torque: Built-in reduction delivers 6.1 kg-m (59.8 Nm) starting torque and 3.8 kg-m (37.3 Nm) dynamic torque at 850 RPM, overcoming heavy static inertial loads instantly.
2. Reversible High-Flow Control Manifold: Fitted with an integrated directional control spool valve that enables smooth forward, reverse, and proportional throttling directly at the motor head.
3. Continuous Duty & Overload Protection: Can be stalled indefinitely under full working torque load without overheating, internal insulation breakdown, or mechanical motor burn-out.
4. Marine Corrosion Protection: Cast iron and corrosion-resistant high-tensile alloy housing with precision-ground steel output shaft and multi-layer marine epoxy coating to resist ocean spray and harsh humidity.

Our Engineer’s Guide

1) Air Quality & Lubrication Setup (Critical)

A vane air motor does not die of mechanical fatigue; it dies from dry air and moisture condensate.

• The FRL Rule: Install an FRL (Filter-Regulator-Lubricator) station within 3 to 5 meters of the inlet port. Regulate incoming service air to 6.0 kg/cm².
• Oil Setting: Set your micro-mist drip lubricator to deliver 3 to 5 drops per minute of pneumatic tool oil (ISO VG 32 or SAE 10W detergent-free oil) during active running.
• Dry Air Failure Mode: Running the SAM-4.5VP unlubricated causes the composite vanes to heat up, glaze, chip, and score the cast iron cylinder wall within dozens of running hours, dropping torque output by over 50%.

2) Moisture Trapping on Vessel Decks

Marine deck service lines collect hundreds of milliliters of water from thermal cycling between day and night. Always crack open the dead-leg drain valve on the air line to blow out scale and condensate before coupling the line to the PT 3/4″ motor inlet. Water slugs will cause hydraulic lock or delaminate the phenolic composite vanes.

3) Vane Wear Limits & Overhaul Field Check

• Measure the radial width of the rotor vanes during scheduled intermediate dry-dock or annual inspections. Replace the entire rotor vane set if vane height is worn down by more than 1.5 mm from the original OEM edge specification, or if bevel edges exhibit feathering.
• Always replace the dynamic shaft seals and front thrust bearings concurrently to avoid pneumatic bypass into the reduction gearbox housing.

Frequently Asked Questions

What does the “85” signify in the model number SAM 4.5 VP 85?

The “85” designates the output shaft speed classification of 850 RPM. In the SAM BU classification matrix, this speed is achieved through a factory-integrated internal reduction gear ratio of 1:4.4 coupled to the 4.5 PS vane motor body.

Can the SAM 4.5 VP 85 motor run continuously without overheating?

Yes. Unlike electric motors that experience thermal overload and winding burnouts under heavy work cycles, compressed air expands as it passes through the vane chambers of the SAM 4.5 VP, naturally cooling the motor housing during operation. It can run under continuous full load or be safely stalled without structural damage.

Can this motor rotate in both directions (reversible)?

Yes. The SAM 4.5 VP series comes standard with an integrated directional control spool valve. Shifting the directional lever re-routes incoming compressed air to alternate cylinder ports, instantly reversing the rotation direction (clockwise or counter-clockwise) while delivering balanced torque in both orientations.

What is the correct air hose diameter for supply lines?

A supply hose with a minimum inner diameter (ID) of 3/4″ (19 mm) is required to sustain 4.1 m³/min airflow at 6 kg/cm². Using undersized lines or restrictive quick-disconnect couplings will cause a severe pressure drop during load engagement, preventing the motor from reaching its rated 3.8 kg-m dynamic torque.

Is the SAM 4.5 VP 85 suitable for hazardous deck spaces on LNG/LPG tankers?

Yes. Because it uses purely pneumatic drive mechanics without electrical components, brushes, or slip rings, it does not produce arcs or electrical sparks, making it suitable for hazardous Zone 1 and Zone 2 marine deck operations.