Valve Sizing Tool


EA-1 Style 3F

Temperature control for storage calorifiers or slow recovery heat exchangers. Heating medium: Steam or Hot water. Valves with flanged inlet and outlet connections. Standard length thermostat pocket.

Available sizes 15mm - 50mm.

Designed and manufactured by Horne Engineering Ltd.

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Temperature control in hot water storage calorifiers, tanks, industrial washing machines and process heat exchangers. Often used in conjunction with the HORNE direct heating Steam Injection Heater.

Horne Steam Injection Heater
Horne EA1 Application with steam or primary hot water


  • Direct acting - requires no external power supply
  • Simple installation
  • 3 flanged connections for pipe and tank
  • Ease of maintenance
  • Size DN15 - DN50


Heating Medium

Steam or primary hot water.

Installation Considerations

Typical installations often pair the Horne EA-1 with the HORNE direct Steam Injection Heater.

The Steam Injection Heater should be fitted as low as possible in the tank. The HORNE EA-1 Thermostatic valve must be fitted above the Steam Injection Heater with a gap of at least 50mm between it and the heater.

A vacuum breaker should be fitted between the strainer and the HORNE EA1 Thermostatic Valve to prevent a vacuum forming in the steam supply pipe. Where the steam supply is below the level of the water in the tank, a non-return valve must be fitted between the HORNE Steam Injection Heater and the HORNE EA-1 Thermostatic valve to prevent water from the tank flowing back up the steam pipe, due to gravity, when the steam supply is turned off.


A stop valve should be fitted between the Steam Injection Heater and the non-return valve to enable maintenance work to be carried out on both the EA-1 Thermostatic Valve and the non-return valve.

The HORNE EA-1 Thermostatic Valve can be mounted vertically. If the level of liquid in the tank varies, the pocket on the HORNE EA-1 Thermostatic Valve must be long enough to ensure that when the liquid is at its lowest level, at least 230mm of the thermostatic pocket is immersed in the liquid.

More than one Steam Injection Heater may be required and, if so, they can be fitted to a common steam supply pipe.

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