Key Features

  • Assisted lift for low-pressure steam operation
  • Durable bronze body with stainless steel internals
  • High-temperature operation up to 185 °C
  • PTFE seals for long-term chemical and thermal resistance
  • Compact and robust design suitable for industrial use

1 Bronze Steam Solenoid Valve 0-10 Bar 2/2 Normally Closed

£251.35 incl. VAT £209.46 ex. VAT

-27% Was £342.76 incl. VAT

Brand: Kuhnway Corporation (Queen)

Model: MK25S

Stock: 37 in stock

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Description

1 Inch Bronze Steam Solenoid Valve – Queen MK25S


The Queen MK25S is a 1" BSPT 2/2 way normally closed bronze steam solenoid valve designed for reliable control of steam, hot oils, water, air and compatible gases. Featuring an assisted-lift (kick pilot) operating principle, the valve opens from zero pressure differential while providing dependable operation up to 10 Bar. Its large 25 mm orifice offers excellent flow capacity, making it ideal for steam distribution, process heating, industrial boilers and demanding high-temperature fluid control applications.

Valve function & operation

Function: 2/2 way normally closed
Operating principle: Assisted lift (kick pilot)
Minimum operating pressure: 0 Bar
Port size: 1" BSPT
Optional threads: NPT or Rc

Pressure & flow

Steam: 0 to 10 Bar
Air & water: 0 to 8 Bar
Oil: 0 to 7 Bar
Orifice: 25 mm
Kv flow factor: 88.66 L/min
(Based on water with 1 Bar pressure drop.)
Maximum media temperature: +180°C
Ambient temperature: -20°C to +50°C
Maximum media viscosity: 50 cSt
Mounting position:
Coil upright (±15° from vertical)

Construction & materials

Body: BC6 bronze
Piston: Stainless steel and bronze with PTFE sealing
Internals: Stainless steel
Tube: 304 stainless steel
Seals: PTFE with graphite impregnated PTFE gaskets

Media compatibility

✓ Steam
✓ Hot and cold water
✓ Compressed air
✓ Vacuum (to 10 Torr)
✓ Inert gases
✓ Hot and light oils up to 50 cSt
✓ Fluids compatible with the valve materials

Coil & electrical

Standard coil: M17 19 Watt DC, 35 VA AC (26 VA holding)
Class H (180°C)
100% continuous duty rated
DIN 43650A connector
IP65 protection

Voltage options:

24V DC
24V AC (with rectifier connector)
110V AC
230V AC

Applications

Steam distribution systems
Industrial boilers and heating plant
Hot oil circulation systems
Process heating equipment
Autoclaves and sterilisation systems
Food processing machinery
Chemical and pharmaceutical processing
General industrial fluid control

Manufacturing quality

Manufactured using a high-quality BC6 bronze body with stainless steel internal components, the Queen MK25S has been engineered for dependable long-term operation in demanding industrial environments. Its assisted-lift operating principle provides reliable switching from zero pressure differential, making it particularly suitable for low-pressure steam, gravity-fed systems and vacuum applications where conventional servo-assisted valves cannot operate. The PTFE sealing system offers outstanding resistance to high temperatures, thermal cycling and aggressive operating conditions, delivering reliable performance and long service life.

Ordering information

Simply select the required voltage and thread type before adding the valve to your basket.

Related Products & Categories


Steam Solenoid Valves

Replacement Solenoid Coils

Electrical DIN43650 Connectors

View Technical Specification

Technical Specification

Brand: Kuhnway Corporation (Queen)

Model: MK25S

Width: 41.00 mm

Height: 133.00 mm

Depth: 88.00 mm

Weight: 1.70 kg

Valve / Product Type: Solenoid Valve

Body Material: Bronze

Voltage: 110vAC, 230VAC, 24vAC, 24vDC

Port Size: 1 thread

Function: 2/2 Failsafe Closed

Operation: Direct Acting

Pressure: 0.1 Bar (100 mBar), 0.2 Bar (200 mBar), 0.3 Bar (300 mBar), 0.4 Bar (400 mBar), 0.5 Bar (500 mBar), 0.6 Bar (600 mbar), 0.7 Bar (700 mBar), 0.8 Bar (800 mBar), 1 Bar, 1.2 Bar, 1.3 Bar, 1.4 Bar, 1.5 Bar, 1.6 Bar, 2 Bar, 2.5 Bar, 3 Bar, 3.5 Bar, 4 Bar, 4.5 Bar, 5 Bar, 5.5 Bar, 6 Bar, 6.5 Bar, 7 Bar, 7.5 Bar, 8 Bar, 8.5 Bar, 9 Bar, 10 Bar

Seals: PTFE (Teflon)

Approvals:: IP65

Media: Air, Fluid (Non Aggressive), Gases (Non Aggressive), Oils + Fuels 50cSt Max, Steam, Vacuum (Low), Vacuum (Medium), Water

Orifice: 25mm