vmv@bellowvalves.com  |  +86-577-67978269  
Characteristics and working principle of thermodynamic trap
Thermodynamic traps are widely used in low, medium and high pressure steam delivery pipes, process heat tracing, and small displacement equipment due to their small size, large displacement, energy saving, long life, and low temperature resistance.

The technical advantages of VMV traps are: unique and reasonable structure + high-precision internals.

1. Working principle:
The thermodynamic steam trap relies on the difference in flow velocity between steam and condensate. When the condensed water passes through the valve seat, the flow velocity is low, and the valve plate opens to remove the condensed water; when steam enters the valve seat, the valve seat is closed due to the high flow velocity. The low-temperature trap uses flash steam to close the valve seat.

2. Product advantages:
VMV thermal power trap low-pressure trap valve body adopts A105, and medium-pressure trap valve body adopts 15CrMo.
Repeated calculations according to Bernoulli equation and a large number of experiments finally determine that each product can provide low temperature type and saturated type. The low-temperature type discharges at a lower temperature (large subcooling) and has low noise but poor air discharge capacity; the saturated type discharges condensed water close to the saturation temperature (low subcooling), with greater noise and good air discharge capability.
VMV breaks through the problems of thermal power traps that are not energy-saving, noisy, and emit original steam, and become the best steam pipe guide trap. Its advantages are small size, long life, reliable action, convenient maintenance, and low noise (low temperature type) ) No original steam leakage.

3. Structural features:
a. The valve body and bonnet are all made of forged steel/cast steel.
b. The valve disc and valve seat are made of special stainless steel. Through heat treatment and aging treatment, they are invariable and wear-resistant under high temperature and high pressure, which improves the service life of the trap.
c. The stainless steel heat preservation cover isolates and slows the heat loss, and prevents the air trap phenomenon of the trap.
d. The fluid channel of the internal structure is designed strictly in accordance with Bernoulli's equation, and the structure is reasonable.
e. Built-in filter makes the trap work in a clean environment.
f. The back pressure rate is as high as 80%. 
4, the thermodynamic trap selection:
Thethermodynamictrap is intermittent drainage. Normally, the STD16 trap has a subcooling degree of 5-10%, and the STD42 has a subcooling degree of 20-50°C. If the degree of subcooling is required, please indicate when ordering. The back pressure rate of the thermodynamic trap is as high as 80% (back-end pipeline pressure/steam pressure), which is suitable for pipelines and small equipment to remove condensate. In general, the safety factor is 2-3 times.