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Thursday, January 29, 2009

Pressure Reducing Valve

This valve is use for reduce pressure like from high pressure compressor or high pressure steam from boiler.
  • Fully machined forged valve
  • Allows controlled start-up and shut-down of different loops in the power plant with a minimum of heat losses
  • Resistant against thermal stress and requires no additional preheating above the demand for superheated steam in the inlet
  • Cage plug for flow control that results in a protected seat area and high range ability – 50:1 or more Pressure reducing pipes in outlet to create a multistep pressure reduction providing for minimum noise and vibrations
  • Special seal bonnet to guarantee tightness and easy maintenance
  • Bolted bonnet also used for low pressure class

The BTG valve type VLR has been designed as a pressure reducing valve for high pressure and/or low pressure systems where a steam conditioning valve is not applicable.

The Kv/Cv-value of the valve depends on the pressure ratio p1/p2 and must – for each valve – be calculated in the BTG computer program, where all throttling points in the valve are taken into consideration. Certified dimensional drawing will be supplied by CCI.

Main applications – high pressure system
  • Pressure control/turbine bypass.
  • Controlled pressure build-up in the boiler.
  • Protection against exceeding the design pressure. Note!
However without the safety function for which the valve VLR-O should be used.
Main applications – low pressure system
  • Controlled pressure build-up in the reheater.
  • Pressure control/bypass of the intermediate and low pressure part of the turbine. This will assist in avoiding release of the safety valves and consequently helps to prevent large condensate losses.
  • Protection of the condenser in case of disturbances.
  • Turbine extraction control
Main duties – process industry
  • Controlled pressure in steam pipes to the process – in parallel with the back pressure turbine.
  • Provides the process with steam flow during start-up of the turbine.
  • Fast take-over of the whole steam flow from boiler to process when the turbine stops/trips.