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Self Contained Valves


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Thermal Activation Products

Three-Port Thermostatic Control Valves

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Rostra's three port valves ensure the proper operating temperature of any mechanical system, thanks to exclusive aerospace technology used for accurate temperature control.

Once the proper optimum operating temperature is reached, the valve automatically diverts fluid and/or mixes fluid to maintain optimum temperature through any cooling or heating system.

Designed for easy installation and no maintenance, the three port valve is constructed of lightweight CNC machined aluminum and standard Viton rubber seals. It is available in 1/4" and 1/2" port sizes, with connections of various ports such as male or female NPT, AN or SAE.

PR Family

Pressure Relief

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Rostra's pressure relief valves can be specifically designed for cracking pressure 15 PSI and higher.

Our standard range of pressure valves include:

  • Poppet
  • Cartridge
  • Adjustable
  • Custom
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Thermal Relief Valves

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Release fluid at any temperature between 30-300ºF.
  • Highly accurate
  • Maintenance free
  • Self energized


Rostra's thermal relief valves provide accurate release of any fluid by sensing temperature. Simply order the correct thermal relief temperature between 30F and 300F and it will be set and sent out ready to use. These valves are 100% maintenance free, and require no power source.

  • 100% maintenance free
  • Temperature range 30F - 300ºF
  • Pre-set to your temperature
  • Accurate within 1 degree
  • Various materials
  • Custom adaptation available
Four Port Products

Four Port Thermostatic Diversion Valves


Four Port Thermostatic Control Valves ensure the proper operating temperature for any mechanical system, thanks to the exclusive aerospace technology used for accurate temperature control. These valves are powered by a thermal actuator and are designed for each customer’s specific function needs. These valves can regulate fluid in any temperature range from 30F to 300F.