Amot Controls 2GEFCBA012-CBL 2” DN50 Temperature Control Valve

AMOT Controls 2GEFCBA012-CBL 3-Way Rotary Temperature Control Valve | 2” (DN50)

The AMOT Controls 2GEFCBA012-CBL is a 2-inch (DN50) 3-way rotary temperature control valve designed to provide precise thermal regulation for critical marine propulsion systems, diesel generator sets, turbine lubrication skids, and industrial heat recovery processes. Engineered as part of the established AMOT Model G family, the 2GEF series replaces erratic thermal wax elements with an externally actuated quarter-turn rotary shoe mechanism.

This unit is optimized for both mixing (combining hot and cold streams into a constant-temperature discharge) and diverting (directing a single variable stream between a heat exchanger and bypass circuit) operations. Built with high-integrity pressure containment, low hydraulic pressure drop across the ports, and zero stem leakage via high-grade Viton (FKM) dynamic seals, the 2GEFCBA012-CBL handles continuous mechanical vibration, shock loading, and hostile marine atmospheres with ease.

Model Details:

• Product Series: AMOT Model G
• Model Code Breakdown:
  • 2 — Nominal Port Bore: 2 Inches (DN50)
  • GEF — Model G Rotary 3-Way Valve Body configured for external Electric Actuation
  • CBA012-CBL — Factory configuration detailing ductile iron/bronze metallurgical trim, standard Class 150/PN16 flange orientation, Viton internal dynamic packings, internal rotor porting profile, and electric actuator coupling kit (matched for AMOT EA-series / EA 100 quarter-turn actuators).
• Actuator Pairing: Compatible with AMOT EA100, standard quarter-turn 24 VDC, 110/120 VAC, or 208/240 VAC high-torque industrial servomotor actuators with integrated potentiometric or 4–20 mA feedback transmitters.

Technical Specifications

Key Features

1. Low Pressure Drop Hydrodynamic Rotor: Advanced internal casting minimizes head loss and avoids turbulence-induced cavitation, saving parasitic pump energy on closed cooling loops.
2. Dual Mixing and Diverting Modularity: Internal port machining permits either 90° or 180° rotor travel, letting engineers route thermal loops as either combining (mixing) or splitting (diverting) assemblies without replacing piping spools.
3. Leak-Free Rotary Shoe Architecture: Eliminates high-wear reciprocating linear shafts; dual Viton shaft packing seals completely suppress external fluid sweating and gland packing maintenance.
4. Vibration Resistant Drive Assembly: Actuator interface engineered to absorb high g-forces and engine harmonics that commonly damage linear diaphragm actuators on high-speed diesels.
5. Integral Manual Drive Handwheel: Integrated override permits full manual mechanical rotation of the valve rotor during electrical power outages or shipboard emergency blackouts.

Applications

• Marine Main Propulsion Jacket Water: Closed-loop high-temperature (HT) cooling circuit regulation on marine diesel, dual-fuel, and medium-speed propulsion engines.
• Auxiliary Generator Lube Oil Skids: Maintains optimal kinematic lube oil viscosity during rapid engine loading and offloading transients.
• Turbocharger Scavenge Air Cooling: Temperature control of charge air cooling systems (LT/HT intercoolers) to prevent internal condensation and thermal shock.
• Marine Reduction Gearboxes: Protects bearing sets and high-torque clutch plates from cold oil cavitation and overheating.
• Power Generation Cogeneration Units: Thermal balancing across Combined Heat and Power (CHP) exhaust gas economizers and plate heat exchangers.

Compatible Engines & Systems

• Caterpillar / MaK: 3508, 3512, 3516, C32, M20C, M25C cooling skids
• Wärtsilä / Sulzer: 20, 26, L20 auxiliary generator modules
• MAN Energy Solutions: L16/24, L21/31, L23/30 auxiliary engines
• Cummins Marine: QSK19, QSK38, QSK50, KTA38, KTA50 cooling loops
• Turbine & Pump Skids: Rolls-Royce, GE, Solar Turbines auxiliary lube consoles

Part Number Cross-References

• AMOT 2GEFCBA012-CBL
• AMOT 2GEF-CBA-012-CBL
• AMOT 2GEF-series (Size 2″ / DN50)
• AMOT EA100-2GEF Assembly Combination

Frequently Asked Questions

What is the primary difference between the AMOT 2GEF series and AMOT thermostatic wax valves?

Wax element thermostatic valves (such as the AMOT Model B or C) rely on passive thermal wax expansion inside the fluid stream. The 2GEF is an active 3-way rotary valve actuated by an external electric motor or pneumatic system responding to precise electronic RTD/PT100 temperature sensors. This eliminates sluggish thermal hysteresis and provides fast response to engine load changes.

Can the AMOT 2GEFCBA012-CBL be operated manually if electrical power fails?

Yes. The valve actuator assembly is fitted with an integrated manual override handwheel/hex key. In the event of an electrical blackout or control board trip, an engineer can disengage the electric drive and manually rotate the shoe to direct cooling flow through the heat exchanger, keeping the engine running safely.

Is this valve suitable for raw seawater cooling circuits?

The standard ductile iron body configuration is intended for fresh jacket water, treated glycol cooling loops, and lubricating oil. For raw seawater service, specify the AMOT Model G in cast bronze or stainless steel to prevent galvanic corrosion and biofouling.

How do I wire the control loop for a 4–20 mA input signal?

Terminals on the coupled electric actuator receive the isolated 4–20 mA analog control signal from your engine’s PLC or AMOT 8071/8072 electronic controller. At 4 mA, the valve holds the bypass position (fast warmup); at 20 mA, it opens fully to the cooler. The actuator also outputs a 4–20 mA position feedback loop back to the Alarm and Monitoring System (AMS).

Can the valve be mounted vertically or inverted?

The valve body can be installed in horizontal, vertical, or angled pipe runs. However, the electric actuator should ideally be oriented upright or horizontally — never upside down directly beneath the valve body — to protect the actuator electronics in case of fluid leakage or external condensation.