1-9400
Letdown Stations with Limiphon trim
1-9000 series Limiphon valves are widely used in steam pressure reduction and desuperheating stations, quite frequent in turbine by-pass lines.
As a matter of fact:
- The pressure reduction takes place through paths whose section changes with the flow rate, thus granting the fluid velocity control in any operation condition
- The fluid velocity control allows to limit the noise generated by the valve and grants the absence of vibrations and trim wear
- The Limiphon trim has no construction limits as far as number of stages (so called "lunettes", due to their particular shape) and expansion of flow paths section are concerned. Therefore there are no practical limits for Δp and p1/p2 ratio as required by the process.
- Limiphon valves may be sized in order to generate noise pressure levels comparable to the ones caused by the fluid flowing inside the piping. In this case they could not be essential for predicting the noise level produced by the whole line.
- Unlike the valves provided with fixed section silencer installed downstream, Limiphon valves are the technically ideal solution for the above process, as well as for all applications where a strong pressure reduction takes place and regular vibration-free operation, maximum noise reduction under significant load changes are required.
