The application of 2 inch copper vent valve is an application program in combined cycle power plant. At the beginning of operation, these valves bypass the steam turbine and discharge the main steam of HRSG into the atmosphere, so that the unit temperature will not rise too fast. This is because the process line is already hot before allowing steam to pour through the turbine bypass valve to the condenser.
In the application of 2-inch copper vent valve, the high-temperature main steam (HP / MP / LP) is bypassed to the atmosphere. When the HRSG starts to ignite, the pressure and temperature rise to a certain point. Because the control valve bears the full differential pressure, the valve and the downstream pipeline will produce high noise and vibration. Therefore, flow limiting devices such as diffusers or silencers are usually installed downstream. This design provides a back pressure to the valve to limit the pressure drop and subsequent noise and vibration. It can also be used to reduce noise before leaving the system is introduced into the atmosphere. The control valve noise requirement is usually 85 dB. In some cases, insulation can be used to meet noise requirements. However, in many applications, downstream piping valves are not insulated. The far-field noise requirement depends on the location of the plant, but it is generally 60 dB at the fence line.
