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Control valves regulate the flow of fluids as the position of the valve plug or disk changes with the force from the actuator. For this the valve has to achieve different things:

• The      fluid should be contained without external leakage

• The      capacity for intended service should be adequate

• There      should be proper end connections to combine with adjacent pipelines and      actuator attachment means to permit transmission of actuator thrust to the      valve plug stem or rotary shaft.

The development in technology has resulted in the creation of several styles of control valve bodies. Some of them can be used for different purposes as required. Let us look at some of them:

1.    Single port valve bodies: In these valves metal to metal seating surface or soft seating with PTFE or other material is used to make the seat. 

2.    Balanced plug cage style valve body:  In this only one seat ring is used and hence it can be considered to be single ported. This provides the advantage of a balanced valve plug which usually only double ported valves provide. 

3.    High capacity cage guided valve bodies: There are oversized end connections incorporated in the design with a streamlined flow path which makes the trim maintenance easy with cage style constructions .

4.    Port guided single port valves