Mechanical vs Venturi



A steam trap keeps steam in the system and allows condensate to be discharged at certain points as it forms.

There are various types of conventional steam traps such as:

- float and thermostatic (ball float type)
- inverted bucket
- thermodynamic (flat disc type)
- thermostatic

The majority of industry has always used conventional mechanical steam traps that have bulky moving parts such as buckets or floats and have oversized orifices that when they start to leak or fail, pass excessive amounts of steam back into the condensate return system thereby wasting boiler fuel to generate that steam. These traps require continuous maintenance as they are prone to failure due to their mechanical nature and also require expensive spare parts that need to be fitted when these traps fail resulting in costly loss of production and additional labour costs.

MECHANICAL TRAPS open in the presence of condensate and close in the presence of steam. The open/close mechanism is activated by internal floats, buckets, bi-metals, bellows or discs. They cycle several times a minute and a couple of million times a year, resulting in wear and failure. They have a 3-5 year lifetime.

With the new Delta DSV™ Steam Trap this excessive steam loss is eliminated through the unique orifice venturi design which has no working parts and therefore requires no maintenance or spare parts and eliminates loss of production through failed steam traps. The Delta Steam Trap is a fit and forget type trap that allows the plant uninterrupted production and improved heat transfer. Delta Venturi Orifice Steam Traps have an expected lifespan in excess of 30 years.


1. Fail open and waste steam

2. Mechanical parts requiring maintenance

3. Oversized orifice

4. Spare parts required

5. Large heat loss off big body of trap

6. Backs up condensate between cycles

7. Fair to medium resistance to wear

8. Fair to medium resistance to water hammer

9. Excellent to handle a varying condensate load with a temperature control valve in place

1. Cannot fail open and waste steam

2. No moving parts = no maintenance

3. Precisely sized orifice

4. No spare parts required

5. Minimal heat loss off very small body

6. Continuous discharge - does not back up condensate

7. Excellent resistance to wear

8. Excellent resistance to water hammer

9.Excellent ability to handle a varying condensate load with a temperature control valve in place