LN83 series cage guided globe control valves are single-seat LN8 series pressure balance control cage valves, one of the three largest base type products. Use separate sleeves, large guide structure, balance pressure sealing ring, high-performance nonmetal sealing ring, has good dynamic stability, high control precision, allow the pressure difference is big, the operating force is small, large flow capacity, etc. Suitable working conditions of normal temperature, differential pressure, under the action of alternating stress control.
The standard mate of LN8 series is AM8 Multi-spring pneumatic diaphragm actuator, which can be used in many conditions with the features of strong output force, high reliability, long lifespan and extensive application. The output force changes with the number of springs. The high stress resistant diaphragm, bearing maximum pressure of 0.5 MPa air supply, gives control valve a reliable shutoff. This type of actuator has a long life cycle with more than 1 million times.
|Nominal Size||DN40 ~ DN400()|
|Operateing Temperature||-40℃~ 150℃|
|Characteristics||Equal percentage, linear, quickly open|
|Seat Leakage Class||ANSI B16.104: IV、V、VI|
|Body Material||WCB/WCC/LCB/LCC;WC6/WC9;CF8/CF8M;4A/5A etc.|
|Trim Material||630/316/316+ST/316nitriding/316+Ni60/316+WC etc.|
|Seal Material||PTFE+ graphite v-shaped packing, flexible graphite ring packing, graphite +PTFE braided packing etc.|
Nominal diameter: DN40/50/65/80/100/125/150/200/250/300/350/400
Pressure rating: ANSI CL150/300/600; DIN PN16/25/40/63
Valve body and upper bonnet material: WCB, WC6, WC9, CF8, CF8M, etc.
Upper cover form: standard type (-17 ℃ ~ +316 ℃); high temperature type (+316 ℃ ~ +593 ℃); low temperature Ⅰ type (-45 ℃ ~ -17 ℃); low temperature Ⅱ type (-100 ℃ ~ -45 ℃); low temperature Ⅲ type (-196 ℃ ~ -100 ℃); bellows type (-45 ℃ ~ ＋350 ℃)
Packing type: PTFE+graphite V-shaped packing; flexible graphite ring packing; graphite+PTFE compilation packing; etc.
Flow characteristics: equal percentage (%); linear (L)
Adjustable ratio: 50:1
Allowable leakage: metal seal: ANSI B16.104 Class Ⅳ; soft seal: ANSI B16.104 Class Ⅵ
What is cage guided control valve?
The Cage valve is a balanced valve that can be used as a dump valve, pressure regulator, suction controller, recirculation valve, and plunger lift applications. Compared to the stem-guided series, cage guided control valves feature larger trim sizes (available in 2" to 10" end connections) for higher valve coefficients (Cv). Cage guided control valves can be equipped with an optional electric drive or operated with compressed air to meet zero-emission requirements.
How does cage guided control valve work
These cage-guided control valves throttle by exposing more or less the port area in the surrounding cage as the plug moves up and down. The cage is also used to guide the valve plug, so the stem does not need to be subjected to side forces like stem-guided valve designs.
The "T" shaped ports in the cage valve through which fluid flows when the plug is moved up and out of the way:
One advantage of the cage-guided design is that the flow characteristics of the valve can be easily changed by simply replacing the cage with another hole of a different size or shape.
What is the Cage Guided Globe Control Valve application?
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.
What is the structure of Cage Guided Globe Control Valve?
The most excellent cage guided 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.
how to replace cage guided control valve
All that is required to replace a cage guided control valve is to separate the bonnet from the rest of the body, at which point the cage can be removed from the body and exchanged with another cage.
In order to replace the plug of a globe valve, you must first separate the bonnet from the rest of the body, then remove the plug and stem from the actuator stem, taking care not to disturb the packing inside the bonnet as you do so.
After replacing the cage-guided control valve plug, the valve's "base setting" must be readjusted to ensure proper seat pressure and stroke calibration.
what is cage guided control valve
cage-guided control valves are available with balanced and unbalanced plugs. Balanced plugs have one or more ports drilled from top to bottom, allowing fluid pressure to equalize on both sides of the plug. This helps minimize the forces on the plug that the actuator must overcome:
The force produced by an unbalanced plug is equal to the product of the differential pressure across the plug and the plug area (F = PA), which can be considerable in some applications.
Balanced cage-guided control valve plugs do not produce the same force as they balance the pressure on both sides of the valve plug, however, when the valve is in the fully closed position (through the balance port, through the piston rings), they exhibit the disadvantage of having more leakage paths and Catch port
Therefore, balanced and unbalanced cage guided control valve have similar characteristics to dual-port and single-port stem or port-directed globe cage valve, and for similar reasons.
SUPCON is a specialist control valve manufacturer of cage valves designed to meet the critical service process control requirements of a wide range of applications in the oil and gas, petrochemical and power industries.
Headquarter Add.: SUPCON Park, No.309 Liuhe Road, Binjiang District, Hangzhou, 310053, China.
Tel.: +86 571 8111 9774
Fax: +86 571 8111 9737
E-mail: [email protected]