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Model J:

Three way thermostatic valve

AMOT Model J thermostatic valves are fully automatic, 3-way fluid temperature controllers for diverting or mixing applications. They are used to provide reliable control of fluid temperatures in engine jacket water and lubricating oil systems. These valves are suitable for process control and industrial applications where fluids must be mixed or diverted depending on their temperatures. They may also be applied to cogeneration systems to control temperatures in the heat recovery loop assuring proper engine cooling and maximizing heat recovery. As with other AMOT thermostatic valves, the J valve uses fully enclosed, factory-set temperature element assemblies which provide tamper-proof operation.


Features and Benefits:

  • No external power source required - simple, low cost installation

  • No user setting needed - ‘fit and forget’ solution

  • Small number of parts – simple maintenance and low cost of ownership

  • Robust design capable of high vibration and shock applications

  • Easy installation, operates in any mounting position

  • Automatic self-sensing control with positive proportional valve action


  • Lubricating oil temperature 

  • Jacket water high temperature (HT)

  • Secondary water low temperature (LT)

  • Heat recovery

  • Water saving applications 

  • Boiler inlet temperature control

  • Co-generation, cooling towers

  • Temperature mixing or diverting

  • Engine and compressor cooling system

Temperature ranges: 18-113°C  (64-235°F)

Materials: Aluminum-BS:1490, grade M25TF light weight

Connections: Flanged 20 mm BSP, NPT, M26x1.5, JIS,SAE


The temperature control power is created by the expansion of a wax/copper mixture which is highly sensitive to temperature changes. Large forces are created by the warming/expansion of the mixture which in turn acts upon the sliding valve, thus regulating the flow.

During operation the sliding valve constantly modulates for accurate temperature control. The reliable rugged construction provides a unit sensitive to temperature variations, not easily disturbed by pressure changes and sudden surges and maintains stable temperatures over a wide range of operating conditions.

Download data sheet on the J-valve >>

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