The cage guided control valve has streamlined body access to increase flow capacity. Control valve body internal parts can be replaced online .The structural feature of the cage guided control valve is that the flexible metal gasket containing asbestos or teflon material is placed between the seat ring and the valve body.Sleeves and seat rings are sometimes designed as one, spools are cylindrical and flow characteristics depend on the shape of the window, which is usually cast around the sleeve.

Cage guided control valve core can be made into a channel inside the hollow plunger, which can make the fluid pressure across the cage guided control valve core, near the slot at the top of the sleeve is equipped with a sliding seal, in the export of the upper seal control valve core, the equilibrium structure helps to offset the effect on the valve core of hydrostatic pressure, leading to reduce the thrust of the actuator, but like two seat control valve, the seat of the leak amount increases significantly.
The biggest feature of cage guided control valve is easy maintenance, if necessary, the control valve can replace valve internal parts online ,and no need remove the control valve body from the pipeline, which greatly facilitate the maintenance work.
 
There is also a kind of unbalanced cage guided control valve, the inner surface of control valve has a certain shape, seat ring with a disc valve core can form a kind of equal percentage flow characteristic, and can be inverted 180 degrees,when the medium is slurry , the cage guided control valve is a good choice .