Valves – find manufacturers and suppliers

Valves are crucial components in a variety of systems that regulate, control or shut off the flow of liquids or gases.

They are central to many industries, such as chemical processing, food production, water treatment, oil and gas and the automotive industry.

Below is an overview of the basic functions, types and use of valves, as well as notes on maintenance and operation and modern developments:

Basic functions of valves:

1. Valves can completely shut off flow to shut down a system or allow for maintenance.
2. Valves control the flow rate, pressure or direction of liquids or gases.
3. Valves direct the flow into different channels or systems.
4. Valves serve as safety mechanisms to control pressure and prevent dangerous situations.

Main types of valves:

1. Shut-off valves:
   Gate, ball, plug and butterfly valves are used to fully open or close the flow.
2. Control valves:
   These valves, such as needle valves or butterfly valves, precisely control the flow.
3. Check valves:
   Prevent the backflow of liquids or gases in the opposite direction.
4. Safety valves:
   Automatically opening valves that reduce the pressure if it rises above a certain level.
5. Strainers:
   Filter dirt particles out of the medium to protect the system.

Valve applications:

1. Water treatment:
Butterfly valves and check valves to control water flows and prevent backflow.

2. Chemical industry:
Corrosion resistant valves for handling aggressive chemicals.

3. Food and beverage industry:
Hygienic valves that are easy to clean and do not allow contamination of the medium.

4. Automotive industry:
Pressure control valves and injection valves in engines and fuel systems.

5. oil and gas industry:
High-pressure shut-off valves, non-return valves and control valves for the extraction, processing and transportation of liquid or gaseous raw materials.

Valve maintenance and operation:

• Valves should be checked and maintained regularly to prevent leakage, wear or corrosion.
• Control valves must be calibrated regularly to ensure accurate control and regulation.
• Moving parts of some valves require lubrication to function smoothly.

Modern developments in valves:

• Modern valves are often automated and allow for remote monitoring and control, increasing efficiency and safety in complex systems.
• Advances in materials science are improving the resistance of valves to extreme conditions, such as high temperatures or corrosive environments.
• The development of valves with low energy consumption and improved tightness contributes to sustainability.

This overview illustrates the versatility of valves and their importance in a wide range of applications. The correct selection, installation and maintenance of valves is crucial for the efficient and safe operation of many technical systems.

Here is an overview of the most important criteria to look out for when buying valves:

When purchasing valves, there are several important factors that must be considered to ensure that the valve selected meets the specific requirements of the system in question.

• The valve material must be suitable for the medium it is intended to control, be it liquid, gas, steam or chemicals. Corrosive or abrasive media require special materials such as stainless steel or PTFE.
• Take into account the maximum and minimum operating pressures and temperatures of the system in which the valve is used. The valve must be able to withstand these conditions without losing its functionality.
• consider whether the valve should only open or close the flow completely (e.g. ball or gate valve) or whether it must regulate the flow precisely (e.g. control valve, butterfly valve).
• Select a valve that functions perfectly in the intended installation position (horizontal or vertical) and supports the desired flow direction.
• Commonly used materials are cast iron, steel, stainless steel, brass and various plastics. The choice depends on the ambient conditions and the medium.
• The seals must also be resistant to the medium and the operating conditions. Commonly used materials are PTFE, EPDM, NBR and Viton.
• The nominal diameter (DN) of the valve should match the pipe diameter to ensure optimum flow capacity.
• The Kv value indicates how much fluid can flow through the valve. A correctly calculated Kv value is crucial for the design of the system.
• Note the connection types suitable for your application:
• Threaded connections are suitable for smaller pipes. They allow easy installation.
• Flanged connections are suitable for higher pressures and larger pipes. They are easy to assemble and disassemble.
• Welded connections offer a durable and tight connection, but require more complex installation.
• Manually operated valves are simple and inexpensive, but less precise and require physical presence to operate.
• Electrically, pneumatically or hydraulically actuated valves offer precise control and are suitable for automated systems.
• In complex systems, the ability to remotely control and monitor valves can be critical.
• Look for certificates such as ISO, CE, API or other industry-specific standards that guarantee the quality and suitability of the valve for specific applications.
• In high-pressure systems and hazardous environments, safety valves that open automatically in the event of overpressure must be installed.
• Choose valves that are easy to maintain, especially if they are installed in areas that are difficult to access.
• Consider the service life of the valve in relation to the operating conditions and maintenance requirements. A more durable valve can be more cost effective in the long run.
• Consider not only the initial cost, but also the operating costs that may arise from maintenance and possible downtime.
• Make sure spare parts are readily available to ensure quick repairs and minimal downtime.

These points provide a comprehensive guide to selecting the right valve to ensure optimum performance and longevity in your specific application scenario.

Valves can be purchased from various suppliers. Comprehensive information about manufacturers and suppliers of Valves from all over the world can be found on Exportpages.