Control valves – find manufacturers and suppliers

Control valves, also known as proportional valves, are crucial in industrial processes to precisely control the flow of liquids, gases or vapors.

Their main task is to regulate the flow, pressure, temperature or level in a system and thus ensure constant operating conditions.

Below is an overview of the main functions, types and applications of control valves and their advantages:

Main functions of control valves:

1. Flow control: adapting the flow rate to the required process.
2. Pressure control: Maintaining a certain pressure level by opening or closing the valve.
3. Temperature control: Control of heat transfer by regulating the medium flow.
4. Level control: Maintaining a specific liquid level in tanks or containers.

Types of control valves:

1. Ball valves: Suitable for fast switching operations, high pressures and flow rates.
2. Needle valves (plug valves): This design offers precise flow control and is ideal for small flows.
3. Flap valves: Are cost-effective and good for medium pressure and medium temperature applications.
4. Diaphragm valves: Particularly suitable for hygienic or sterile applications, e.g. in the food and pharmaceutical industries.
5. Spool valves: Offer low pressure losses and are suitable for large diameters.

Applications of control valves:

1. Process industry:
Control of steam, gas and liquid flows in chemical, petrochemical and pharmaceutical plants.

2. Heating, ventilation and air conditioning (HVAC):
Control of hot or cold water flows for temperature regulation.

3. Water supply and waste water treatment:
Control of water flow in pipelines and systems.

4. Power generation:
Control of boiler water, condensate and steam in power plants.

Advantages of using control valves:

• Optimization of processes through precise control of flow and pressure.
• Reduction of energy consumption through precise adjustment of operating conditions.
• Prevention of overpressure or uncontrolled flow conditions that could lead to damage.
• Adaptability to different process requirements and operating conditions.

Control valves are therefore essential components in many industrial applications and processes.

Here is an overview of the most important points to consider when purchasing control valves:

When purchasing control valves, there are several important criteria to consider to ensure that the selected valve meets the specific requirements of the application. Here is an overview of the most important points to look out for:

• The Cv value indicates how much fluid flows through the valve when it is fully open. This value must match the desired flow rate and the operating conditions.
• The valve must be designed for the maximum operating pressure that can occur in the system.
• The materials and seals of the valve must be suitable for the maximum and minimum temperatures that occur during operation.
• Depending on the specific application, you should select the appropriate valve type (e.g. ball valve, cone valve, diaphragm valve, gate valve).
• Pay attention to whether the valve has a linear, equal percentage or fast opening control characteristic, depending on how precise and fast the control needs to be.
• Select the material based on the chemical properties of the medium flowing through the valve. Common materials are stainless steel, brass, cast iron and plastic. Corrosion resistance and mechanical strength are particularly important.
• For use in corrosive environments (e.g. in chemical plants or outdoors), the valve should be made of corrosion-resistant materials.
• If the valve is installed in a potentially explosive atmosphere, it must comply with the relevant safety requirements (e.g. ATEX certification).
• Depending on the temperature and chemical composition of the medium, seals made of PTFE, EPDM, NBR or other specialized materials should be used.
• A manually operated valve may be sufficient for simple applications.
• Pneumatically, electrically or hydraulically operated valves offer more precise control and are suitable for more complex processes.
• For precise process control, the valve should be equipped with a positioner that provides feedback on the current status of the valve.
• The connections (e.g. flanges, threads, welding connections) must be compatible with the existing piping system.
• Ensure that the valve fits into the space provided and that the installation position (horizontal, vertical) is suitable for the specific valve type.
• The valve should be easily accessible for inspection, maintenance and possible replacement.
• Depending on the application, a specific tightness class may be required to minimize the risk of leakage.
• Ensure that the valve meets the required safety and industry certifications (e.g. ATEX for potentially explosive environments, SIL for safety-critical applications).
• The valve should be easy to maintain. Check the availability of spare parts and technical support.
• Compare the costs of different valves, but also consider the quality and total cost of ownership (TCO).
• Consider energy consumption (e.g. for electrically operated valves) and maintenance costs.
• A valve with a longer service life and a good warranty can be more cost-effective in the long term.
• Make sure that the valve can be delivered within the required time.
• Choose suppliers that offer good technical support and after-sales service, including training, documentation and on-site service.

By carefully considering these factors, you can select the right control valve that meets the technical requirements as well as the economic and safety conditions of your application.

Control valves can be purchased from various suppliers. You will find comprehensive information on manufacturers and suppliers of Control valves around the world on Exportpages.