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Steam Conditioning Valves
-Steam
conditioning engineering is of considerable importance in the steam generating
and steam consuming industries, e.g. power plants, pulp and paper industries,
seawater desalination plants, breweries, refineries etc.. As the name already
implies, steam conditioning is the simultaneous change of both temperature and
pressure - pressure reducing and de-superheating station (PRDS). A steam
conditioning valve replaces the separate arrangement of a pressure reducing
valve and a de-superheater. It requires less space and is more cost
effective.
De-Superheater Regulator
-A de-superheater is a regulating
device for control installations in many fields of industry, providing precise
cooling.
Minimum Flow Non-Return Valves -These protect centrifugal pumps from possible damage caused by thermal and hydraulic overloads at low load operations by means of an automatic controlled by-pass flow which corresponds with the required minimum flow of the pump.
3.10 Applications
for Specialist Power Valves - This technical bulletin provides some
information on the various applications.
3.10
HORA
Turbine Bypass System - A turbine bypass system permits operation of the
boiler independently from the steam turbine during start-up, commissioning,
turbine trip (shut down) and load alternations. It gives a higher plant
availability and operational flexibility over all different operating
conditions. The start-up time under cold, warm and hot conditions is reduced.
Keeping the thermal transient in the boiler to a minimum continuous flow through
superheater and reheater (maintained tube cooling) must be provided and the
pressure during the entire start-up has to be controlled. This article describes
how the bypass valve achieves this. From www.flowandcontrol.com