First, there are problems with the old selection criteria for traps:

Guilong Valve believes that the performance of the traps of the Royal Chemical Industries' industrial plants in Huddersfield and Grangemouth (England) for up to 7 years, the performance of the traps and the freshness of the first stage in the two manufacturers' laboratories Based on the monitoring and experimentation of steam losses, Royal Chemical Industries of the United Kingdom finally revised the contents of the drafting instructions for the selection of traps in the Engineering Design Guide. The new Guide to the change includes a trap selection table.

There are many disadvantages to the old selection criteria for hydrophobic valves. The most obvious is that it does not mention the type of hydrophobic equipment and the hydrophobic method. The selected traps often do not match the actual load. Particularly serious is that the thermodynamic disc trap (the basis of the old selection criteria) is mistaken by people, especially the workshop personnel, as a universal trap.

The experiment revealed that there are many problems with the old selection criteria for traps:

1. The steam main steam trap has a short life.
2. The performance of the trap has failed and does not match the actual load selection.
3. As the most widely used thermodynamic disc trap, it has the worst energy saving effect and has a very short life compared with the inverted bucket trap.
4. The action of the bimetal trap is easy to be unstable.

Second, the selection of traps:

The new Guide to the change includes a trap selection table. Steam trap selection tips:

1. Inverted bucket trap:
As the first choice for all process loads and steam line steam traps, ie where all steam is required to be hydrophobic.
2, float thermostatic trap:
Used for process hydrophobicity, especially in applications where the load is below 3.5 kg (50 psig) or where air content is high and there is a problem with the installation of the inverted bucket trap.
3. Balanced pressure trap:
Used as an unimportant heating or heating system.
4, bimetal thermostatic trap:
Used in low temperature or frost protection conditions of heat tracing lines or heating systems. This type of trap maximizes the sensible heat in the condensate or prevents the product from overheating. Its valve body is all stainless steel.
5. Thermodynamic disc trap:
As an alternative to inverted bucket traps, it can be used as a substitute for inverted bucket traps on steam mains and heat pipes below 17 kg or as a product replacement for higher steam pressures. It is not recommended due to its low energy efficiency and short service life (and is not allowed at the Huddersfield and Grangemouth plants).
6. In the case where the heat demand is not high, replacing the thermodynamic disc trap with a thermostatic trap will improve the energy saving effect and ensure the service life.
7. Mechanical trap valves (ie, inverted buckets and float traps) ensure that steam does not contain condensate in the case of large condensate load or low load, while thermostatic traps tend to accumulate when load increases. Condensed water.