Last Updated on November 6, 2022 by Hooria Batool
A temperature regulator, known as a temperature control valve (TCV), controls and measures temperature.
Instead of maintaining a set value directly, temperature regulators link the load (here, the valve opening) with the control (temperature measurement). Temperature regulators are most valuable when a substance’s flow is correlated with temperature. This guide is all about the temperature control valve in detail.
Temperature control valve
The temperature of water in engine jackets, compressors, turbines, compressor blades, and lubrication oil is controlled by a temperature control valve. Generally, these valves are used in process control applications and in industrial settings where liquids must be mixed or diverted to achieve the right temperature.
Also, it is possible to use them to directly control the temperature in the heat recovery loop in co-generation systems, ensuring that the engine is properly cooled and maximizing the amount of heat that is recovered.
The number of ports on a valve most commonly determines its use in industrial applications. There are two ports on the 2-way valve, three ports on the 3-way valve, and so on.
The type of valve you specify depends on the flow rate, the temperature range, the kind of fluid, and the pressure range, so knowing these requirements will help you choose the correct valve. Many companies produce two forms manufactures three-way control valves: thermostatic (internally sensing) and actuated (externally feeling).
What are the types of temperature control valves?
The actuated control valve
A control valve that is actuated by an external probe senses temperature changes in contrast to ones that sense temperature internally.
In order to operate the valve ports, the search sends a signal to a control panel via an external power source. There are various types of systems, including electric, pneumatic, and a combination of both. This type of valve has several advantages, despite requiring more components.
In the first place, they typically have a much higher level of precision, so if you need precise temperature control, this may be the best option. The second advantage of these systems is their ability to adjust the temperature range based on changing operating conditions, unlike thermostatic valves.
A thermostatic control valve
A thermostatic valve is called when fluid temperatures drive it sensed and controlled internally. The valve is self-contained and does not need an external power source. According to the manufacturer’s recommendations, the operating temperature range of wax material is determined in the factory or by the local distributor based on its chemical composition.
A thermostatic element cannot be changed until a new one is installed after calibrating to a set temperature. A rugged, straightforward design prevents accidental overheating and underheating of the equipment, resulting in increased fuel consumption, expensive repairs, and downtime.
Parts of the temperature control valve
- Assembly Stuffing Box: This contains valve packing in its stuffing box. It is necessary for the valve packing to move up and down as the stem opens or closes to provide a seal between the stuffing box and the valve.
- Actuators for controlling valves: These actuators adjust valve position based on pneumatic signals from pressure pilots or other pneumatic controllers. A fail-closed valve can be converted to a fail-open valve by disassembling and inverting this actuator.
- Yoke and Travel Indicators: The yoke and travel indicators allow the user to identify the valve’s location at any given moment visually.
- Seat and stem: The seat and stem block the flow of liquid through the valve. During production, these pieces are exposed to abrasive or corrosive environments, making them susceptible to wear and tear.
- Actuator bonnet: the actuator bonnet contains the diaphragm and spring.
- Valve spring: The valve spring retains tension on the stem, allowing it to hold its fail position.
Working of temperature control valve
A pneumatic actuator or hydraulic actuator, as well as an electrical actuator, can close or open an automatic control valve. A modulating valve that can be adjusted between fully closed and fully open is controlled by a valve positioner to achieve the desired degree of opening.
Generally, air-actuated valves are used for simplicity since they only need to be supplied with compressed air.
However, electrically operated valves require additional switch gear and cabling, while hydraulically actuated valves must also be provided with hydraulic fluid and high pressure.
0.2 bars to 1.0 bars are the pressure range of pneumatic control signals. At the same time, 4mA to 20mA is the electrical signal for industries, and 0 V to 10V is the electrical signal for heating, ventilation, and air conditioning.
An electrical control includes a bright communication signal superimposed on the control current of 4mA to 20mA, allowing for valve position verification to be signaled back to the controller. In addition to the highway addressable remote transducer protocol and Profibus, there is the field bus foundation protocol.
Applications of temperature control valve
- It is capable of controlling pressure as well as flow.
- Flow control for low-pressure applications and large flows.
- Corrosive liquids can be handled at low pressures and temperatures.
- This device is used for on-off applications.
- The device can be used to restrain traffic.
FAQs (Frequently Asked Questions)
How does a TCV valve work?
In hot water supply systems, the TCV standard temperature control valves mix hot and cold water to control the outlet temperature. Consequently, boiling water is reduced.
What is the purpose of a control valve?
Variables such as flow, pressure, temperature, and other parameters can be controlled by control valves in many processes. A valve will be selected based on the pipe’s size, the overall stress the system operates under, the flowing medium, and the process conditions.
What are the workings of a three-way temperature control valve?
Water flow can be shut off in one pipe while opened in another with a 3-way control valve. Water from two lines can also be mixed into one tube or diverted from one pipe into two pipes when using a modulating or 3-point floating valve.
What is the purpose of a low limit temperature control valve?
The low limit temperature control valve maintains a temperature of 32-35 degrees Fahrenheit by modulating bleed air. Using the temperature control ducting, air leaves the water separator and is routed to the rest of the aircraft. The ECU constantly modulates the atmosphere between 32 and 35 degrees Fahrenheit.
Which types of control valves are there?
Various types of valves and control operations are available. A sliding stem or a rotary stem is the most commonly used action. There are many different kinds of control valves, but a sliding-stem globe valve is one of the most common, and a butterfly valve is another.
What is the difference between the three temperatures?
PID controllers, on-off controllers, and proportional controllers are the three basic types. To control the process, the operator can use one or another style, depending on the system to be held.