What are the general requirements for the installation of the globe type control valve?

What are the general requirements for the installation of the globe type control valve?

April 18, 2019

  • The installation position of the globe type control valve should meet the requirements of the process design, and should be close to the one-point indicating instrument related to it, so that it can be observed once when the bypass valve is manually operated;
  • The globe control valve should be placed on the ground or platform and convenient for operation and maintenance;
  • The globe control valve should be installed vertically on the horizontal pipe in the vertical direction. Under special circumstances, it can be installed horizontally or obliquely, but it must be supported;
  • When installing the globe control valve block (including globe control valve, bypass valve, shut-off valve and drain valve), the globe control valve should be installed below the bypass. A globe control valve with a nominal diameter of less than 25 mm can also be installed above the bypass;
  • The clearance of the bottom of the globe control valve from the ground or the surface of the platform shall not be less than 400mm. For the single and double seat globe control valve of the reversed spool, the space of the valve core shall be left under the valve body;
  • There should be a clearance of not less than 2mm above the top of the globe control valve head. When the globe control valve and the bypass valve are arranged up and down, the position should be opened;
  • The shut-off valve should use the gate valve, the bypass valve should use the stop valve, but when the nominal diameter of the bypass valve is greater than 150mm, the gate valve can be selected, and the two shut-off valves and the globe control valve are not arranged straight in line;
  • A drain valve shall be provided at a low point of the pipe between the inlet side of the globe control valve and the shut-off valve upstream of the globe control valve, and the drain valve may be a gate valve;
  • The globe control valve on the pipe containing solid particles in the medium should be arranged on the same plane as the bypass valve or the bypass valve should be arranged below the globe control valve;
  • One of the two brackets of the globe control valve group on the low temperature and high temperature pipelines is a fixed bracket and the other is a sliding bracket;
  • The globe control valve should be installed at an ambient temperature not higher than 60 ° C, not lower than -40 ° C, and away from the vibration source;
  • When there are more globe control valve groups in an area, the form should be considered consistent, neat, beautiful and easy to operate;
  • When the diameter of the globe control valve and the blocking valve are different, the reducing pipe should be installed close to the adjusting room;
  • It is important to note that the process has no special requirements for the position of the globe control valve.