We use cookies to make your experience better. To comply with the new e-Privacy directive, we need to ask for your consent to set the cookies. Read our Privacy Policy.
Model G: 3-Way Rotary Control Valves
The AMOT Model G is a high-performance 3-way temperature control valve designed with an externally actuated electric or pneumatic system that delivers more accurate, repeatable temperature regulation and performance compared to thermostatic wax valves in mixing or diverting applications. Commonly used in engine cooling, lubrication systems, heat exchangers, and industrial process control, it’s available with electric, pneumatic, or electro-pneumatic actuation.
This valve features a compact, heavy-duty rotary design that minimizes pressure drop, fits tight spaces, and withstands vibration, even when mounted directly to engines or rotating equipment.
Compatible with water, glycol, seawater, synthetic and petroleum-based oils, and other fluids, the Model G can be configured with a wide range of sizes, materials, port orientations, and signal types.
Key Features:
- Precision control to within ±1°F with external temperature sensing
- Multiple actuation types with fail-safe and high-vibration options
- Available in sizes ½" to 16" (DN15–DN400)
- Body materials: ductile iron, bronze, carbon steel, stainless steel
- Seal options for high-temp, low-temp, oil, and water service
- Leakage classes: ANSI Class II (0.5%) or Class IV (0.01%)
- Flange types: ANSI, PN, JIS
- Max pressure: up to 16 bar; max flow: 3,170 GPM
Certified For:
- Hazardous areas: ATEX, CSA, IECEx
- Marine use: ABS, Lloyd’s, DNV, Bureau Veritas
- IACS classes: CCS, KR, RINA, and more
Over 25 years of proven performance in power generation, marine, chemical, and oil & gas systems.
Additional Documents
Specifications
| Size range | 2" (DN50) to 16" (DN400) |
| Body materials |
Ductile cast iron |
| Actuation types |
24 VDC
|
| Communications options | 4-20mA 3-15 psi Pulse Width Modulation (PWM) CAN bus |
| Certifications available |
Hazardous area
Marine class (IACS associated)
IACS class
|
Applications
The AMOT Model G valve eliminates stem leakage in many marine, power generation and oil & gas applications where typical linear stroke valves have been installed. They are a suitable replacement in many applications where these valves have been used:
- Fisher GX
- Fisher YD
- Ari Stevi 450
- Leslie RVB
- Leslie RVD
- Leslie RVK
- Robertshaw RT-1004
- Robertshaw RT-1010A
- Robertshaw VC-230A
- Robertshaw I-1284
- Robertshaw I-1285
- Samson 250
- Samson V2001
- Samson 3253
- Samson 3244
- SOMAS SV
- Fulton Sylphon 923-3
Operation
Electric
For the electric valve, the actuator of the G valve assembly uses an electric motor which rotates in either direction in response to the ON-OFF signals received. The motor drives a gearbox connected to the rotor shaft and turns the valve rotor clockwise or counter-clockwise, a maximum of 90 degrees. At the end of travel, limit switches are incorporated to isolate the electrical supply to the motor when the valve rotor has reached either end of the rotation. A feedback potentiometer is standard and provides position indication to the control system. The actuator is powered by an electric motor driving a worm-type gearbox. The worm gearbox prevents reverse drive due to fluid forces. It is fitted with manual override as standard, enabling valve operation without power.
Pneumatic The pneumatic valve uses a spring return pneumatic actuator and positioner to control the rotation of the valve in response to an input signal from a pneumatic or electro-pneumatic control system. The pneumatic control system sends a pneumatic signal ranging from 3 to 15 psi to the actuator to correctly position the valve at the desired temperature setting. The pneumatic control system usually consists of a P+I pneumatic controller, sensor and the necessary air supply conditioning equipment (regulators, filters and water traps). The actuator is fitted with spring return as standard allowing fail-safe configuration if necessary. It is also fitted with a valve positioner enabling accurate and repeatable movement.
Electro-Pneumatic
The electro-pneumatic valve system combines both electric and pneumatic technology, consisting of a pneumatically actuated three-way control valve with an electro-pneumatic converter, type 8064A. See page 17 for more details. The probe sends a resistance signal to the electronic controller, which in turn sends a 4 to 20mA signal to an I/P converter that converts this to a pneumatic signal. The electro-pneumatic system combines the features and functionality of the AMOT electronic control system with the fail-safe action benefits of a pneumatically actuated valve.
To Operate This Product, You’ll Also Need
