RFQ

2/2 Way coaxial Direct Acting Valves MK / FK 25

  • NG # 04064-HW-coax-008

The MK / FK 25 is a 2/2-way coaxial direct acting solenoid valve designed for reliable control of liquids and gases in industrial systems. It offers threaded or flanged connections, a balanced pressure design, and the option of normally closed or normally open operation. With a nominal K₍ᵥ₎ of 13.0 m³/h and a wide pressure range up to 100 bar, it supports high-performance fluid control. The valve is suitable for various media including viscous and contaminated fluids and provides robust electrical and mechanical specifications for demanding environments.

Manufactured By :
COAX
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Overview

The MK / FK 25 valve belongs to the 2/2-way coaxial direct acting valve series from müller co-ax, characterized by a compact coaxial design that balances pressure forces and ensures dependable actuation across a broad range of applications. It is available with threaded ports or flange connections, and comes in normally closed or normally open variants to suit system requirements. The valve supports a broad spectrum of media from gaseous to highly viscous and contaminated fluids, with reliable sealing and switching behavior. Electrical interfaces include standard plug connections and optional DESINA/M12x1 connectors. Accessories such as limit switches and mounting brackets allow customization for specific installations. Its construction and performance characteristics make it suitable for industrial automation, fluid control, and process systems requiring high reliability and flexibility.

Specification

General

  • Type: 2/2-way coaxial direct acting valve MK / FK 25 (normally closed and normally open versions) 
  • Function: Normally closed (NC) / Normally open (NO) 
  • Actuation: Directly actuated solenoid valve 
  • Flow direction: A → B as marked on valve 

Connection and Ports

  • Port sizes: Threads G 1 to G 1 ½ 
  • Flange options: PN 16 / 40 / 100 
  • Electrical connection: Plug per DIN EN 175301-803, form A (4 positions, 90°), wire diameter 6-8 mm 
  • Optional connector: M12×1 (DESINA / VDMA) 

Performance

  • Pressure range: 0-16 / 0-40 / 0-63 / 0-100 bar 
  • K₍ᵥ₎ value: 13.0 m³/h 
  • Switching cycles: 130 per minute 
  • Switching time: Opening ~130 ms, Closing ~130 ms 

Operating Conditions

  • Media temperature range: DC −20 °C to +100 °C; AC −20 °C to +100 °C 
  • Ambient temperature range: DC −20 °C to +80 °C; AC −20 °C to +80 °C 
  • Media types: Gaseous, liquid, highly viscous, gelatinous, contaminated 

Electrical

  • Nominal voltages: 24 V DC (+5/−10%), 230 V AC 40-60 Hz (+5/−10%) 
  • Insulation rating: H (180 °C) 
  • Protection class: IP65 
  • Energized duty rating: 100% ED 

Mechanical

  • Weight: MK approx. 8.0 kg; FK approx. 10.5 kg 

Accessories (optional)

  • Alternative electrical connectors (M12×1, DIN EN 175301-803, metal terminal box) 
  • Limit switches (multiple models) 
  • Mounting brackets

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