Sep. 13, 2021
Only by fully understanding single seat and cage guided globe control valves can they be used correctly. This article helps you understand them better.
Single Seat Globe Control Valve, the trim is interchangeable in the body. It's content to various technics liquid process by replacing the different trim assembled.
The single-seat globe control valve is the furthest common control valve type, a simple structure, is used for the strict sealed close situation. A single-seat globe control valve can be controlled the maximum flow rate by changing the size of the 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 services.
Among different types of valve bodies, single-seated valves have trim structures with the easiest collocation, for example, angle valves. As a result of high-pressure fluid is generally held the load to add the whole area of the 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 are much less for the single-seated valve on the process control.
Cage Guided Control Valve, cage structure, straight stroke control valve. the trim is interchangeable in the body Its content to various technics liquid processes by replacing the different trim assembled.is designed focused on high-pressure drops, effectively reduce the effects of cavitation and the noise in the high-pressure drops services. favorable 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, an actuator for standard diaphragm type. By metal seat, the suitable temperature range is -196 +538, and by soft seat, the suitable temperature range is -45 +200. It's content to most industrial process control.
The most excellent 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 the valve can be configured actuator smaller than conventional single seat valve.
The most simple structure of cage guided control valve is twin-seat, the twin-seat structure is applicable to situations that requirement of leakage is not high. The cage-guided single-seat control valve has a sliding seal between plugs top with cage. by seals function, dispelling the leak that upriver fluid entered the low-pressure downriver system. So it have the tightly closed characteristic as conventional single seat valve, moreover have balance characteristic.
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