Markco Single Seat Valve MK-GS Series

The MK – GS type control valve is a single – seat control valve.This valve is specifically designed to control various liquids, gases and steam. Its specially perforated cage and valve core can better adapt to harsh working conditions.

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This series of control valves can be optionally equipped with special configurations such as bellows seal type, steam jacket type, extended bonnet, and others.

Product Features:

  • The MK-GS control valve complies with both European EN standards and American ANSI standards.

  • The valve body wall thickness is designed in accordance with ASME B16.34-2013. Each valve body cavity is optimized through 3D modeling and CFD simulation to ensure fluid stability.

  • Modular Design – The entire control valve and actuator are collaboratively designed with a modular approach, offering excellent design and maximizing parts commonality across various sizes.

  • Dynamic Loading Packing – The standard control valve system is equipped with dynamically loaded PTFE V-ring packing. The dynamic loading design helps ensure reliable sealing of the process medium, significantly reducing the risk of fugitive emissions from the valve stem packing, and complies with low-emission standards ISO 15848-1 and TA-Luft VDI 2440.

  • The valve body construction allows the materials to comply with NACE MR0175/ISO 15156-2003.

Table 1: Standard Specifications – Body Section

 
 
SpecificationENANSI
Nominal DiameterDN 15, 20, 25, 40, 50, 80, 100, 1500.5″, 0.75″, 1″, 1.5″, 2″, 3″, 4″, 6″
Nominal PressurePN 10/16/25/40
Compliant with EN 1092-1
Class 150/300
Compliant with ASME B16.34
Connection TypeFlanged per EN 1092-1 for raised face
Compliant with HG/T 20592-2009
Flanged per ASME B16.5 for raised face
Compliant with HG/T 20615-2009; SH/T 3406-2013
Face-to-Face DimensionCompliant with EN 558-1Compliant with ANSI/ISA 75.08.01
Bonnet TypeStandard, Extended (Low-Temp), Extended (High-Temp), Bellows Seal, Compact 
Leakage ClassMetal Seat: ANSI/FCI 70-2 Class IV (Optional: Class V)
Soft Seat: Class VI
 
Flow DirectionFlow Up (Upward) 
Flow CharacteristicEqual Percentage, Linear 
Rangeability50:1 
 
 
Orifice DiameterTrim Type
4.8 mmMicro-flow Trim
9.5, 14, 22 mmStem-Guided Trim, Plug Trim
36, 46, 70, 90, 136 mmSeat-Guided Trim
70, 90, 136 mmBalanced Trim, Cage-Guided Trim

Working Temperature

  • WCB / LCB Materials: -29°C to +232°C (LCB min: -46°C). With extended bonnet: up to +371°C.

  • Stainless Steel (CF8/CF8M/CF3/CF3M): -29°C to +232°C. With extended bonnet: -46°C to +371°C.

For detailed technical datasheets, specific model selection guidance, or to discuss your application requirements, please do not hesitate to reach out to our sales team.

If you have any questions about the specifications or need support in choosing the right MK-GS for your system, please contact the Kateteco sales team.

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