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SELF-REGULATING VALVES WITH INTERNAL CONNECTION

For Self-Acting Valves with Internal Sensing, there is no clear distinction between actuator and valve, as the pressure-sensitive element (diaphragm or piston) is located in the flow path between the two.

Advantages

  • Ease of installation as it is not necessary to make any disconnections on the system pipes to connect the process fluid pressure to the valve/actuator.
  • The lack of packing makes the valve more sensitive to pressure variations.
  • Emissions to the outside are reduced to a minimum, making it an ideal solution for toxic/lethal or simply very expensive fluids.
  • It normally has small overall dimensions.

Disadvantages

  • The design becomes complex and uneconomical for valves with very large sizes and high-quality materials.
  • The valve becomes a "black-box" whose exact degree of opening is unknown.
  • Pressure reducing valves have the trim mounted from below (valve normally open) so the installation must also provide suitable clearance spaces in the area below the valve.
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