Top Guided Single Seated Control Valve, the trim is interchangeable in body. It's content to various technics liquid process by replacing the different trim assembled.
Top Guided Single Seated Control Valve is the furthest common control valve type, simple structure, are used for strict sealed close situation. single action valve can be controlled the maximum flow rate by changing the size of plug and seat ring. setting fluid characteristics by changing the curved surface. They are applicable in a wide scope of liquid services as well as steam/gas services.
As a result of high-pressure fluid is generally holded the load to add the whole area of bottom seat, made the single plug to be endured huge unbalanced force from fluid, relative to the control valve with balanced trim, the allowable pressure drops is much less for single seated valve on the Process Control.
Among different type valve body, single seated valve have trim structure with the easiest collocation, for example, angle valve.
Cage Defination - cage: A part of a valve trim that surrounds the closure member and may provide flow characterization and/ or a seating surface. It may also provide stability, guiding, balance, and alignment, and facilitate assembly of other parts of the valve trim
Cage Guided Control Valve, cage structure, straight stroke control valve. the trim is interchangeable in the body Its content to various technics liquid process by replacing the different trim assemebled.is designed focused on high pressure drops, effectively reduce the effects of cavitation and the noise in the high pressure drops services.favourable Interchangeability, be reached different flow characteristics by replacing different cage, to get much higher precision of control. Can be reduced noise, dispelled the effects of cavitation by replacing trim.
Cage Guided control valve size is in common use for 1-12, actuator for standard diaphragm type, Its content to most industrial process control. By metal seat,the suitable temperature range is -196 +538,and by soft seat,the suitable temperature range is -45 +200
The most excellent of cage guided structure control valve is balance characteristic, for plug balance ports function, fluid pressure acted on static unbalance force of plug, it reduced unbalance force, then valve can be configured actuator smaller than conventional single seat valve.
The most simple structure of cage guided control valve is twin-seat, twin-seat structure is applicable to situation that requirement of leakage is not high.
Cage guided single seat control valve have a sliding seal between plugs top with cage. by seals function, dispelling the leak that upriver fluid entered low-pressure downriver system. So it have the tight closed characteristic as conventional single seat valve, moreover have balance characteristic.
