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Pneumatic Thermostats

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Pneumatic thermostats respond to changes in temperature by increasing or decreasing the air pressure in a series of air-filled tubes. The change in pressure signals controllers or powers devices like dampers or valve actuators directly. Pneumatic thermostats are most often installed as replacements in older constructions with existing pneumatic systems, including schools, hospitals, and commercial buildings. They are not suitable for newer constructions without a supporting pneumatic system in place.
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Single-Temperature Piston Valve Actuator Thermostats

Single-Temperature Piston Valve Actuator Thermostats
These thermostats include a piston valve actuator that provides proportional control of steam or water valves in single-temperature applications. They mount on valve bodies and operate them according to the signal from the thermostat. They're ideal for basic temperature control of either heating or cooling in commercial buildings, schools, or hospitals. These thermostats are powered by compressed air.
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Dual-Temperature Piston Valve Actuator Thermostats

Dual-Temperature Piston Valve Actuator Thermostats
These thermostats include a piston valve actuator that provides proportional control of steam or water valves for terminal air conditioners. They mount on valve bodies and operate them according to the signal from the thermostat. These are dual-temperature, dual-pressure thermostats. When the supply pressure to the unit changes, the thermostat automatically switches between heating or cooling. These pneumatic thermostats are powered by compressed air.
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