How does a thermostatic valve work?

How do Thermostatic Radiator Valves Work? The thermostatic valve head goes on top of the valve body. And as the room temperature changes, the valve head expands, adjusting a pin in the valve body so that it opens or closes. Expansion as the room heats blocks the valve body to receive less hot water into the radiator.

What is the principle of control valve?

A control valve is a valve used to control fluid flow by varying the size of the flow passage as directed by a signal from a controller. This enables the direct control of flow rate and the consequential control of process quantities such as pressure, temperature, and liquid level.

What is a thermal control valve?

Thermal control valves provide a means to control the temperature of coolant at a particular point in a system to a defined value. The valves produced by PDT are passive, thermostatic-type valves which do not require electrical power or a control circuit to operate.

What is the operation principle of a thermostatic expansion valve?

A cross section of a thermostatic expansion valve components and the operation principle are showing below. The three forces which control the operation of the thermal expansion valve are: P1 – The vapor pressure of the thermostatic element (a reaction to the bulb temperature) which acts to open the valve.

How is the thermostatic valve used to regulate temperature?

On sensor temperature change, the flow quantity change is approximately proportional. Thermostatic valves are widely used for temperature regulation in many different machines and installations where cooling is required. Thermostatic valve always opens to admit flow on rising sensor temperature.

What are the principles of a control valve?

Principles of Operation. The most common final control element in the process control industries is the control valve. The control valve manipulates a flowing fluid, such as gas, steam, water, or chemical compounds, to compensate for the load disturbance and keep the regulated process variable as close as possible to the desired set point.

How does balance work in a thermostatic valve?

When balance is created between the two opposing forces, the valve spindle remains in its position. 5. If the sensor temperature – or the settings – is changed, the point of balance becomes displaced and the valve spindle moves until balance is re-established, or the valve is fully open or closed.