Only by fully understanding single seat and cage-guided globe control valves can they be used correctly. This article helps you understand them better.
A globe control valve uses a linear motion to move a closure member into and out of a seating surface. They have a body distinguished by a globular-shaped cavity around the port region and are designed to regulate process flow when used in conjunction with an actuator assembly. Many single-seated valve bodies use a cage or retainer-style construction to retain the seat-ring, provide valve plug guiding, and provide a means for establishing particular valve flow characteristics. Cage or retainer-style single-seated valve bodies can also be easily modified by change of trim parts to change the flow characteristic or provide reduced-capacity flow, noise attenuation, or reduction or elimination of cavitation.
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, making 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.
Trim Options
CONTOURED TRIMThe contoured tip option is used on most applications and is suited to low-pressure drops. It includes a plug with a contoured head, the profile of which permits a high-pressure recovery.SOFT-FACEDThis version offers bubble-tight shutoff, thanks to a different plug design, which features a clamped-on shroud. This ensures a high degree of closure, by locking the soft-faced ring in position.Definition
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 reducing the effects of cavitation and the noise in the high-pressure drops services. favorable Interchangeability, be reached different flow characteristics by replacing different cages, to get much higher precision of control. Can be reduced noise, and 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. On a metal seat, the suitable temperature range is -196 +538, and on a soft seat, the suitable temperature range is -45 +200. It’s content with 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 a cage-guided control valve is twin-seat, the twin-seat structure is applicable to situations the requirement of leakage is not high. The cage-guided single-seat control valve has a sliding seal between the plugs top of the cage. by seals function, dispelling the leak that upriver fluid entered the low-pressure downriver system. So it has the tightly closed characteristic as a conventional single seat valve, moreover has balance characteristic.
Trim Options
MICRO / MULTI-SPLINEThe Microspline and multi-spline trim is designed for high-pressure-drop liquid services on applications with low flow rate requirements. These trims are supplied in valve sizes up to 2” (50mm) in diameter. The flow sleeve and plug are constructed as an insertable cartridge, with up to five stages of pressure drop to ensure that cavitation does not occur throughout the stated flow range.ZECO Valve offers high-quality Single Seat and Cage Guided Globe Control Valves, please feel free to contact us if you need them.
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Why Choose Butterfly Valve? | API 6D ball valve manufacturer
How to Choose a Globe Valve, and How does It Work? | API 6D ball valve manufacturer
Features of the Cage guided valve | API 6D ball valve manufacturer
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