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ACTION:Indirect;PilotOutputPressure(Yellow)decreaseswithtemperaturerise

详细介绍

ACTION:
Indirect; Pilot Output Pressure (Yellow) decreases with temperaturerise.
APPLICATION:
For temperature controlled system shutdown until manually reset.
WORKING PRESSURE (sensing element):
psig kg/cm2
500 35.15 max. without Separable Socket
4000 281.23 max. with Separable Socket
7000 492.15 max. with Special Separable Socket
Separable Socket is an extra price item and must be ordered separately, if desired. To order Separable Sockets refer to Table of Contents.
TEMPERATURE RANGE:
T 12M, T 18M -30°F minimum to 400°F maximum
-34°C minimum to 204°C maximum
HT 12M, HT 18M -30°F minimum to 750°F maximum
-34°C minimum to 399°C maximum

OPERATION:
These Thermostats consist of Base Assemblies sending an Indirect Throttle signal to a 3 PGM Pilot. The 3 PGM pilot is connected
so that once the Output Pressure (Yellow) is vented, it must be manually reset to resume service.
Assume the set temperature of the Thermostat is above the temperature of the system being controlled and Pilot Output Pressure (Yellow) is being sent to any Pilot or Motor Valve.
As the system temperature rises, the STAINLESS TUBE increases in length to move the Thermostat Diaphragm (or Bellows) Assembly in a direction to first close the seat at BALL 1 (Yellow to Orange) and open the seat at BALL 2 (Orange to Atmosphere). As Variable Pressure (Orange) decreases, the 3 PGM Pilot Diaphragm Assembly moves upward to close the seat at BALL 4 (Violet to Yellow) and open the seat at Ball 3 (Yellow to Atmosphere). Output Pressure (Yellow) decreases to cause
the desired Pilot or Motor Valve action.
Once the Output Pressure (Yellow) has been vented, the Thermostat is shut down until the temperature of the system is below the set temperature and the RESET LEVER is used to reset the Pilot. If desired the RESET LEVER can also be used to manually vent Output Pressure (Yellow) and shut-down the thermostat.
The 112 SMT-T is the recommended Motor valve for this thermostat configuration. Refer to “Burner Valves" in Table of Contents for more information.
SUPPLY PRESSURE:
5 to 30 psig
.35 to 2.11 kg/cm2