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MK-GC
Fisher
The MK-GC cryogenic control valve is a sleeve-guided control valve with stainless steel structural materials and an extended valve cover. The valve is available in both pressure-balanced and non-pressure-balanced designs.These cryogenic valves are designed for throttling or on-off control of liquids and gases in cryogenic conditions as low as -198 ° C.
If necessary, these robust valves can reliably provide a tight shut-off for special applications in the chemical and hydrocarbon processing industries, such as certain liquefied natural gas conditions and air separation.High-flow valves with pressure balancing valve internals allow for the use of smaller, lower-cost actuators, thereby reducing installation costs in high-pressure and high-flow applications.
| NAME | Materials | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Valve body material | A216WCB,A217-WC6,A217-WC9,A352-LCB | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Valve core | 17-4 PH | 316+RTFE | 316 | 316+ surfacing hardening | |||||||||||||||||||||||||||||||||||||||||||||||||
| Valve seat | 410 | 316 | 316 | 316+ surfacing hardened | |||||||||||||||||||||||||||||||||||||||||||||||||
| Sleeve | 410 | 316 | 316 | 316 | |||||||||||||||||||||||||||||||||||||||||||||||||
| The valve seat allows for leakage | Class IV,V | Class VI | Class IV,V | Class IV,V | |||||||||||||||||||||||||||||||||||||||||||||||||
| Pad ring | Wound gaskets (316L+ polytetrafluoroethylene, 316L+ flexible graphite, etc.) | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Valve cover packing | Ptfe fiber braided packing & PTFE fiber & carbon fiber braided packing, flexible graphite packing | ||||||||||||||||||||||||||||||||||||||||||||||||||||
 Operating temperature | WCB valve body | - 29-425 ℃ | - 29-200 ℃ | - 29-425 ℃ | - 29-425 ℃ | ||||||||||||||||||||||||||||||||||||||||||||||||
| WC6 valve body | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| LCB valve body | --- | - 46-200 ℃ | - 46-232 ℃ | - 46-232 ℃ | |||||||||||||||||||||||||||||||||||||||||||||||||
| NAME | Materials | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Valve body material | A351-CF8,A351-CF8M | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Valve core | 316+RTFE | 316 | 316+ surfacing hardening | ||||||||||||||||||||||||||||||||||||||||||||||||
| Valve seat | 316 | 316 | 316+ surfacing hardened | ||||||||||||||||||||||||||||||||||||||||||||||||
| Sleeve | 316 | 316 | 316 | ||||||||||||||||||||||||||||||||||||||||||||||||
| The valve seat allows for leakage | Class VI | Class IV,V | Class IV,V | ||||||||||||||||||||||||||||||||||||||||||||||||
| Pad ring | Wound gaskets (316L+ polytetrafluoroethylene, 316L+ flexible graphite, etc.) | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Valve cover packing | Polytetrafluoroethylene fiber braided packing & polytetrafluoroethylene fiber & carbon fiber braided packing (oxygen packing) flexible graphite packing | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Operating temperature | - 75-200 ℃ | - 196-565 ℃ | - 196-565 ℃ | ||||||||||||||||||||||||||||||||||||||||||||||||
Notes:
1) The temperature and pressure range for the material treatment of valve internals can be found in the valve internals material treatment selection reference;
2) If cavitation is likely to occur, select a control valve that is resistant to cavitation;
3) If flash vaporization may occur, please choose the type with a reduced cavity, and the surface of the valve core and valve seat should be fully overlay welded with Stellite alloy；
4) For valve cores 1/4 "and below, there is only full Stellite surfacing and no partial Stellite surfacing.
| SPECIFICATIONS | EN | ANSI | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Nominal bore | DN 15,20,25,40,50,80,100,150,250,300 | 0.5, 0.75, 1,1.5, 2,3,4,6,8,10,12 inches | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Nominal pressure | PN 10/16/25/40/63/100 complies with EN 1092-1 | Class 150/300/600 complies with ASME B16.34 | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Connection method | EN 1092-1 standard requirements for convex flanges (RF,RTJ,MFM) HG/T 20592-2009 | Requirements for convex flanges in ASME B16.5 standard(RF,RTJ,MFM) HG/T 20615-2009; SH/T 3406-2013 ASME B16.11 Threaded or sleeve welded SME B16.25 butt-weld type | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Faran distance | Compliant with EN 558-1 | Compliant with ANSI/ISA 75.08.01 | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Upper valve cover type | Common type, extended type I, extended type II, bellows type | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Leak grade | Metal valve seat ANSI/FCI 70.2 Class IV, optional Class V, soft valve core Class VI | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Flow direction | Upward flow | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Flow characteristics | Fast open, equal percentage, linear | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Adjustable ratio | 50:1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Valve internals type | Small flow valve internals, sleeve guided valve internals, multi-hole guided valve internals, labyrinth valve internals,multi-stage valve internals | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Operating temperature | WCB:-29 °C -232 °C, LCB:-46 °C -232 °C. Up to 371 °C with an extended valve cover | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| CF8/CF8M/CF3/CF3M stainless steel: -29℃-232℃ . With an extended valve cover, -196 °C to 565 °C is available | |||||||||||||||||||||||||||||||||||||||||||||||||||||
Interchangeable, limit valve internals and full-size valve internals meet a wide range of process flow requirements for highly specialized applications. Standard valve cages typically have two different flow characteristics: equal and linear.
Low-temperature spring-loaded seals
Seals and associated valve parts in valves are specially designed and manufactured to perform exceptionally well at low temperatures.
Stable control
The robust cage guide in the valve stabilizes the valve core at all points of its stroke to reduce vibration, mechanical noise and act as a hydraulic shock absorber
Cost-effective operation and maintenance economy
Enhanced wear resistance of hardened stainless steel valve internals means longer operating hours. The balanced valve core structure of the valve allows for the use of smaller, lower-cost actuators
Low-temperature design
Stainless steel valve bodies and valve covers with prefabricated extension parts can meet the requirements of low-temperature conditions. The unique metal-to- metal valve seat design can repeatedly achieve a tight shut-off, reducing maintenance costs.
Robust metal valve seats
Metal-to-metal valve seats are designed and manufactured to provide long-lasting, reliable, and tight shut-off at ambient and low temperatures without the need for regular grinding. This reduces the need for a soft valve seat even in applications with strict shut-off requirements.
Prevent fugitive emissions
The optional low leakage packing system provides an improved valve stem seal that helps prevent the loss of valuable or harmful process fluids and keeps emissions below EPA limit 100 ppm. In addition, these dynamically loaded packing systems can work stably for a long time at low temperatures, helping to reduce maintenance costs and downtime.
Fully tested
These valves have undergone extensive low-temperature testing during their design and development, eliminating the need for expensive low-temperature testing required for most applications, thus speeding up delivery and reducing costs.
Easy to maintain
Convenient for quick replacement of valve internals, with clamping valve seat rings for shortened disassembly time. When disassembling the valve internals for inspection or maintenance, there is no need to remove the valve from the pipeline.
Acidic working conditions
For information on NACE applications, please consult your local sales representative.
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