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Reliable valves and services

Achieving optimal travel is among the important factors to consider. Travel at normal flow should ideally fall within a 50 to 60 percent opening angle. Travel at maximum flow should fall below 90 percent for rotary valves and 70 percent for linear valves. Minimum flows should always be above 20 percent to avoid erosion of the trim, especially on linear valves. It is not uncommon to have a control valve smaller than the actual pipe size. As a rule, the recommended valve size should not be less than half the diameter of the pipeline to prevent valve damage caused by piping stress.

  • The installed gain curve is a very good indicator of valve performance in specific conditions. A constant gain line at 1.0 within the control range is ideal. For the best results, the gain should be between 0.5 and 3.0, and the ratio of maximum to minimum gain should be ≤ 2.0.
  • Erosion damage is closely associated with the velocity of the media. Maintaining a proper velocity, especially when media is erosive or flashing, is important for extending your valve life. In such cases, moving to a larger valve may be considered to decrease velocities and thus potential damage to the valve.
  • Aerodynamic noise is strongly related to exit velocity of media. The concern here is mechanical damage caused by intense vibrations. To prevent mechanical damage to your valve assembly, noise levels should be kept below 110 dBA.
  • Hydrodynamic noise is used to predict cavitation intensity. Generally, if you want to eliminate damage you must lower noise to an acceptable level, which in turn means lowering the intensity of the cavitation.
Selection Principles
  • The model and performance of the selected valve can achieve the requirements of process parameters such as flow rate, pressure, working temperature, medium going through pipe etc

  • Corrugated pipe sealing design or leak-free valves are required for valves that transport flammable, explosive, toxic or valuable media,

  • Corrosive materials such as teflon are required for flow passage components for valves that transport corrosive media,

  • For valves containing solid particulate media, it is required that the flow passage component have to be made of wear-resistant material, and if necessary, the shaft seal should be flushed with a cleaning liquid.

  • When valve going through highly corrosive media (such as concentrated sulfuric acid, concentrated nitric acid), flammable and explosive media, and environment must not have any pollution, you can use a resilent valves.

  • Choosing the proper valve is crucial for you as it not only saving the cost, but the valve can work in a long service life.

Experience and Cases
Wetlap Machine #3,TNPL,India

Wetlap Machine|TNPL

PM 7 project| ITC

Rayagada |JK PAPER

Pulp Making|CMPC

Pulp Making|Suzano

Paperboard Making|Visy Paper

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