Tyco Flow Control announced the launch of its newest pilot operated pressure relief valve, the Anderson Greenwood 5200. The 5200 is designed to withstand the high temperatures and pressures that are prevalent in heat recovery steam generators in combined cycle power plants, while meeting the stringent code requirements of the American Society of Mechanical Engineers (ASME).
Tyco Flow Control’s engineers designed a valve that could meet increasing temperatures and pressures and give plant owners the security of premium seat tightness close to set point. The 5200 boasts a metal main valve seat, as opposed to the resilient seat commonly used in pilot operated pressure relief valves. The metal seat allows the valves to withstand higher temperatures – up to 538⁰C. In addition, the 5200 is a modulating pilot operated valve, rather than a spring-loaded or snap-acting pilot valve. This unique feature enables the valve to open in proportion to the specific overpressure needed while providing maximum tightness during the critical start-up processes and allows the valve to operate closer to set pressure without leakage.
Tyco Flow Control developed this pressure relief valve to serve specifically as a safety valve in economizer applications in gas-fired power plants. An economizer uses waste heat to pre-heat boiler feedwater prior entry to the steam drum in gas-fired plants. In the process, flashing water often reaches extremely high pressure and temperature, and code requires that all parts must meet the stringent pressure relief requirements of ASME Section I.