Suttner ST-6 Flow Switch – 8 GPM, 4380 PSI

Model: ST-6
Category: Heating & Combustion → Control Components → Flow Switches
Type: Vertical Mount Flow Switch (Suttner OEM)

The Suttner ST-6 Flow Switch is a high-performance, normally open inline control component designed for accurate flow detection in high-pressure water systems. Built with a free-floating magnet and sealed reed switch, this unit activates system functions when water flow is present and shuts them off when flow stops—ensuring safe and efficient operation.

Key Features & Benefits

• Genuine Suttner ST-6 OEM flow switch
• Normally open design for flow-activated operation
• Vertical mount configuration (required for proper function)
• Free-floating magnet with spring return mechanism
• Sealed reed switch in nitrogen-filled glass capsule
• Eliminates need for vacuum switches and flow restriction
• Reduces leak points and improves system reliability
• Enhances pump lifespan by maintaining unrestricted flow

Technical Specifications

Product Name: Flow Switch (Vertical Mount)
Model / Part Number: ST-6
Flow Range: 1.0 – 8.0 GPM
Pressure Range: 75 – 3600 PSI (Max rated up to ~4380 PSI)
Mounting Orientation: Vertical Only
Switch Type: Reed Switch (Normally Open)
Magnet Type: Free Floating (Spring Return)
Lead Length: 47 inches
Inlet Connection: 3/8" FPT
Outlet Connection: 3/8" FPT
Weight: 16 oz
Brand: Suttner
Condition: New

Wiring Instructions

• Lead #1: Line / Power
• Lead #2: Load
• Yellow/Green: Ground

Adjustment Note:
Depending on system flow, magnet positioning may vary. If the switch does not activate at lower flow rates, adjust the reed switch by loosening the adjustment screw and repositioning it for proper open/close operation.

Typical Applications

• Pressure washer burner activation systems
• Flow-activated heating systems
• Industrial and commercial cleaning equipment
• Replacement for vacuum switch-based systems

Performance Benefits

• Activates system only when water flow is present
• Eliminates diaphragm failures common in vacuum switches
• Reduces leaks and improves system integrity
• Sealed reed switch resists corrosion and harsh chemicals
• Maintains full water flow, improving pump longevity
• Reliable operation in demanding environments