Self acting Thermostats  V4 02-167-001


Self Acting V4
Characteristics :
* Closing Force 200N, 400N and 800N
* For heating and cooling valves
* Temp range 0-160 Deg.
The temperature controller, which consists of a thermostat and a valve, isused for controlling the temperature in central heating systems, district heatingsystems, industrial plants or industrial processes and in marine systems. It can be used for the control of cold or hotwater, steam or oil in heating as well ascooling systems.
The adjusting cylinder of the thermostatis set at the required temperature for the heating medium in °C. This setting can befixed, if required. The temperature control is carried out by the thermostatically controlled valve reducing or increasing the flow of the heating (or cooling) medium.The sensor and the capillary tube,which are filled with a liquid, constitute- together with the adjusting cylinder - a closed system.If the temperature of a medium to be heated is above the required level, the temperature of the sensor liquid risesand expands, causing the piston of the thermostat to act upon the valve, reducing the flow of the heating medium.If the temperature of the medium to be heated is below the required level, the temperature of the sensor liquid falls,reducing the volume of the liquid, so that the piston allows the valve to open under its internal spring, thus increasing the flow of
 the heating medium.The neutral zone of a thermostat is the temperature difference which can occurat the sensor without any movement of the valve spindle. This represents the sensitivity of the control system to temperaturechanges:V2 = 2.5°C, V4 = 2 °C and V8 = 1.5°C.

A thermostat consists of a sensor and acapillary tube, filled with liquid, and an adjusting cylinder.The thermostat type designations and technical data are specified in fig. 2.With temperatures above 150°C, acooling unit must be fitted between thevalve and the thermostat - see fig. 1.The thermostat is self-acting and works on the principle of liquid expansion, it issturdy in its design, and works with a large closing force.
The following sensor types are available- see fig. 4:4.1. Rod/spiral sensor in copper or stainless steel with threaded connection according to ISO R7/1.4.2. Spiral sensor (copper only) with airduct flange.4.3. Rod/spiral sensor with steel flangeDN 50, PN 40 and DN 50, PN 160.4.4. Sensor without connection. Usually used with capillary pack box for temperature control in tanks.
Capillary Tube
The capillary tube is made of copper,stainless steel, or of PVC-coated copper- see fig. 3, but can also be delivered witha flexible iron tube protection.
ValveA wide range of valve types for heating as well as cooling systems can be delivered.See the „Quick Choice“ leaflet no. 9.0.00and datasheets for the valves in question.Subject to changes, without notice.