Valves with heating coat


6.12.2010 | One of the designs beyond the standard control armatures catalog are valves equipped with heating coat. During the regulation of flow via control valve we encounter often the problem of very low temperatures. In the case of liquid media, with a freezing temperature close to ambient temperature, is necessary to heat the pipeline, as well as installed control valves...

- the main reason is to avoid media hardening and blocking the flow.
- other situations where it is necessary to consider heating of control valves is the case of adiabatic cooling of the gaseous medium during the expansion in a large reduction of pressure on the valve. During the flow of media, such as highly compressed natural gas with a temperature of 10-20 °C, the significant temperature drop can happen when pressure is reduced. The largest cooling occurs in the Vena Contracta point, just behind the valve seat and plug. Temperature drop can achieve even a few tens of degrees below 0 °C. This phenomenon has a very negative effect due to such reasons:

  • parts exposed by operation at low temperatures are vulnerable to damage caused by increased fragility of the material.
  • there is a risk of precipitation of particles such as water vapor and deposition of ice crystals inside the valve.
To avoid these negative phenomena, we use a valve equipped with a heating coat. It's made of sheet thickness 3-4 mm, which is welded to the valve body. Into such area is supplied heating medium (e.g. steam, hot water or oil).

Illustrative pictures depict valves with heating coat used in the petrochemical industry. These are valves with electric actuators AUMA in control function and hand-operated valves.

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