Markco Product Introduction
Straight Stroke Control Valve
- MKGS - Single Seat Valve
- MKGC - Sleeve Valve
- MKGH - High Pressure Valve
- MKGL - Large Diameter Control Valve
- MKAC - Angle Valve
- MKGT - Three-Way Valve
- MKDSH - Temperature and Pressure Reducer
- MKA120 - Pulverized Coal Conveying Angle Valve
- MKLG - Fluorine Lined Valve
- MKSA - Food Hygiene Valve
- MKMF - Micro Flow Control Valve
Quarter Stroke Control Valve
- MKEB - Eccentric Rotary Valve
- MKVB - V-Shaped Ball Valve
- MKT200 - High Performance Control Butterfly Valve
Actuators
- MKP(D/R) - Pneumatic Diaphragm Actuator
- MKPC - Quarter-Turn Diaphragm Actuator
Special Working Condition Treatment Method
MK-GS
Straight Stroke Control Valve
Single Seat Valve
Size Range: NPS1/2 to 6, DN15 to DN150
Pressure Level: CL150 to CL300, PN10 to 40
Sealing Level: CL IV (CL V or CL VI optional)
- The MK-GS control valve is a compact, single-seat design with advanced technology, low maintenance, and simple operation. It offers options like bellows seals, steam jackets, and extended valve covers for versatile applications.
MK-GC
Straight Stroke Control Valve
Sleeve Valve
Size Range: NPS1 to 14, DN25 to DN350
Pressure Level: CL150 to CL600, PN10 to 100
Sealing Level: CL IV (CL V or CL VI optional)
- The MK-GC control valve is a high-performance sleeve valve with excellent stability and high flow capacity. It handles various liquids and gases under harsh conditions, including wide pressure drops and temperature ranges. Optional trims and features include bellows seals, steam jackets, and extended valve covers.
MK-GH
Straight Stroke Control Valve
High Pressure Sleeve Valve
Size Range: NPS1/2 to 12, DN15 to DN300
Pressure Level: CL900 to CL3200, PN160 to 420
Sealing Level: CL IV (CL V or CL VI optional)
- The MK-GH regulating valve is a high-pressure sleeve valve with excellent stability for liquid and gas throttling. It handles harsh conditions like high pressure, cavitation, and noise, offering trims for precise control in demanding applications.
MK-GL
Straight Stroke Control Valve
Large Diameter Sleeve Valve
Size Range: NPS12 to 30, DN300 to DN750
Pressure Level: CL150 to CL600, PN10 to 100
Sealing Level: CL IV (CL V or CL VI optional)
- The MK-GL control valve is a large-diameter sleeve valve with excellent stability and high performance. It manages liquids and gases under harsh conditions, handling wide pressure drops and temperatures. Optional trims and features include bellows seals, steam jackets, and extended valve covers.
MK-AC
Straight Stroke Control Valve
Angle Valve
Size Range: NPS1 to 12, DN25 to DN300
Pressure Level: CL150 to CL2500, PN10 to 420
Sealing Level: CL IV (CL V or CL VI optional)
- The MK-AC control valve is an angle valve compatible with straight-through valve trims of the same size, offering all the same solutions as straight-through control valves.
MK-GT
Straight Stroke Control Valve
Three-Way Valve
Size Range: NPS1/2 to 8, DN15 to DN200
Pressure Level: CL150 to CL600, PN10 to 100
Sealing Level: CL IV (CL V or CL VI optional)
- Series three-way cage-guided valves are designed for regulating or switching flow, with the following types:
- Balanced Type: For general confluence and diversion.
- Unbalanced Type: For merging; only recommended for switching in shunt service.
- These valves are ideal for applications in harsh environments, such as sulfide and chloride stress cracking in oil and gas production.
MK-DSH
Straight Stroke Control Valve
Temperature and Pressure Reducer
Size Range: NPS4 to 24（入口),NPS8 to 60（出口）
Pressure Level: CL150 to CL2500
Sealing Level: CL IV (CL V optional)
- Steam regulating valves are designed for demanding power plant cycles and precise pressure/temperature control. The valve body uses advanced Finite Element Analysis (FEA) and Computational Fluid Dynamics (CFD) to optimize performance and reliability in steam systems.
MK-A120
Straight Stroke Control Valve
Pulverized Coal Regulating Valve
Size Range: NPS 1-1/2 X 2-1/2, 2-1/2 X 3
Pressure Level: CL600
120° Angle Valve
- Tungsten Carbide Body Insert
- Trim and Outlet Liner
- Bellows Seal
- Nitrogen/CO2 Purge Flow
- Suitable for pulverized coal transportation.
MK-LG
Straight Stroke Control Valve
Fluorine Lined Valve
Size Range: NPS1 to 4
Pressure Level: CL150 to CL300
Sealing Level: CL VI
- Perfluoro alkoxy resin-lined assemblies protect metal components from corrosive media, eliminating the need for expensive alloys. The valve areas in contact with fluid are lined with at least 5mm thickness. Conveyor molding technology ensures consistency, density, and low permeability, with translucent PFA material.
MK-SA
Straight Stroke Control Valve
Food Hygiene Valve
Size Range: NPS1/2 to 6
Pressure Level: CL 150
Sealing Level: VI
Internal surface finish of 20 Ra (0.5 μm) available
- Hygienic control valves meet 3A hygiene standards, making them ideal for the pharmaceutical and biological industries. They are perfect for throttling high-purity fluids or gases.
MK-MF
Straight Stroke Control Valve
Micro Flow Valve
Size Range: NPS1/4 to 1
Can withstand maximum pressure - 207Bar
Sealing Level: CL VI
CV Value Range: 0.00013 to 2.5
- Control valves are designed for low flow, high-pressure applications in labs and pilot plants. They adjust flow capacity and are ideal for controlling gases, chemical injection, and acid/alkali solutions in various industries.
MK-EB
Angular Stroke Control Valve
Eccentric Rotary Valve
Size Range: NPS1 to 20, DN25 to DN500;
CL150-CL900
Sealing Level: CL IV
Flow Coefficient: 200:1
- The MK-EB eccentric rotary control valve, available in D-type and C-type, controls challenging fluids with throttling or switching functions. It features a streamlined flow path, durable metal trim, and a self-centering seat design.
MK-VB
Angle Stroke Control Valve
V-Type ball Valve
Size Range: NPS 1 to 24, DN25 to DN600
CL150-CL600
Sealing Level: CL IV(CL V or CL VI optional)
Flow Coefficient: 300:1
- The MK-VB V-type control valve combines linear valve durability with rotary valve efficiency. Its V-shaped notch and straight-through flow design enhance performance and reduce clogging for gases, steam, liquids, and fibrous media.
MK-T200
Angle Stroke Control Valve
High Performance Butterfly Valve
Size Range: NPS 3 to 48, DN80 to DN1200
CL150-CL1500
Sealing Level: CL IV
- High-performance butterfly valves with flangeless wafer or single flange designs feature a patented dynamic seal, suitable for demanding conditions.
MK-P(D/R)
Actuator
Thin Film Actuator
MK-PD series
Maximum thrust: 23 KN
Stroke: 19-100mm
Temperature Range: -50-80
MK-PR Series
Maximum Torque: 1800 N.M
Temperature Range: -45-80
- The diaphragm actuator is a lightweight pneumatic actuator with a single spring. Air pressure moves the diaphragm to push the rod, while the spring balances the force, positioning the rod. It's perfect for straight stroke control, adjustment, and switch control.
MK-PC
Actuator-Cylinder Actuator
Maximum Thrust: 354 KN
Stroke: 29-610mm
Temperature Range: -50-80
- The MK-PC cylinder actuator is a double-action, high-output actuator for straight stroke control, ideal for proportional adjustment, switch control, and other linear actions.
About Our History
Markco Machine Works
(American Markco) is a globally renowned control valve brand, belonging to the MAN Group and headquartered in Houston, Texas, USA.
Markco was founded by Patrick Elliott&Ricky Ford in Houston, USA in 1988. At that time, Markco Company served well-known enterprises such as SHELL, BP, Exxon Mobil, Chevron, Texaco, Conoco Phillips, Marathon Petroleum, etc. in Texas. After its establishment, it quickly established its position and reputation in the field of fluid control such as steam, gas, and liquid.
In 1995, Markco provided control valve products to the world-renowned Curtiss Wright company.
Markco was acquired by Mann Flow Controls Inc. in 2015 and has two production bases worldwide, located in the United States and Malaysia. Markco is committed to creating advanced control valve products in the fields of petroleum, chemical, metallurgy, electricity, food hygiene, new energy, and more.
In 2022, Markco will establish a rapid response center and inventory center in Tianjin, China. We provide technical services for special operating condition control valves to Chinese enterprises, and have already provided products and technical services to domestic enterprises such as Sinopec, Shanneng Group, China Guodian, China Guoneng, Ningxia Coal Industry, Yitai Group, Yinxing Energy, Aluminum Corporation of China, Wuhai Guangjin, Hengxin Group, Henan Jindadi, Zhong'an United, Tangshan Zhonghao, Hong Kong Yacheng Gas Field, Inner Mongolia Ewing Polycrystalline Silicon, Rizhao Iron and Steel, etc.
In October 2024, MAN Group established a wholly-owned subsidiary, Mann Flow Control Equipment (Tianjin) Co., Ltd., in Tianjin
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