Description
Pneumatic Shuttle Valve & Double Pressure Valve – ST / STH Series
The ST / STH Series is a compact range of pneumatic logic valves designed for automatic air signal selection and double-pressure control in industrial compressed air systems.
The ST shuttle valve automatically selects between two pneumatic input signals and provides a single output, while the STH double pressure valve requires pressure at both inputs before an output signal is produced.
Manufactured from robust aluminium alloy, these compact pneumatic valves provide simple, reliable control without electrical power and are ideal for machine automation, pneumatic logic circuits, control panels and industrial equipment.
Key Features
✓ Pneumatic shuttle and double pressure valves
✓ ST automatic air signal selection
✓ STH pneumatic AND logic function
✓ 1/8" and 1/4" BSP port options
✓ Optional NPT or Rc threads
✓ 0.8 to 10 Bar operating pressure
✓ Zero electrical power required
✓ Compact pneumatic logic control
✓ Aluminium alloy construction
✓ Suitable for filtered compressed air
✓ -10°C to +80°C temperature range
✓ Ideal for machine automation
✓ Suitable for pneumatic control panels
✓ Large UK stocks available
✓ Technical pneumatic support
✓ Free next working day UK delivery
Valve Function & Operation
ST – Shuttle Valve
The ST shuttle valve has two pneumatic input ports and a common output.
When pressure is applied to either input, the internal shuttle automatically directs the available pneumatic signal to the outlet while isolating the opposite input.
Where different pressures are present at the two inputs, the valve selects the higher pressure and routes it to the common outlet.
This provides a simple pneumatic OR logic function and allows equipment to be controlled from either of two independent pneumatic signals or air supplies.
STH – Double Pressure Valve
The STH double pressure valve provides a pneumatic AND logic function.
Pressure must be present at both X and Y input ports before the valve produces an output signal.
If pressure is removed from either input, the output signal is lost.
This makes the STH particularly useful for pneumatic logic, interlocking and control circuits where two independent pneumatic conditions must be satisfied before an output is permitted.
Valve Specification
Function: Pneumatic shuttle valve or double pressure valve
ST function: Shuttle / OR logic
STH function: Double pressure / AND logic
Port sizes:
1/8" BSP
1/4" BSP
Optional threads: NPT or Rc
Operating pressure: 0.8 to 10 Bar
Test pressure: 10 Bar
Media: Filtered compressed air
Body: Aluminium alloy
Operating temperature: -10°C to +80°C
Operation: Fully pneumatic
Electrical supply: Not required
Flow Specification
ST-01
Port size: 1/8" BSP
Effective flow area: 7.5mm²
Equivalent diameter: Ø3.1mm
STH-01
Port size: 1/8" BSP
Effective flow area: 14mm²
Equivalent diameter: Ø4.2mm
ST-02
Port size: 1/4" BSP
Effective flow area: 21mm²
Equivalent diameter: Ø5.2mm
ST Shuttle Valve Applications
Dual pneumatic control signals
Alternative air supply selection
Pneumatic OR logic circuits
Machine control systems
Pneumatic automation
Air-operated machinery
Control panels
Process control equipment
STH Double Pressure Valve Applications
Pneumatic AND logic circuits
Dual-signal control systems
Pneumatic interlocks
Machine control systems
Automation equipment
Control panels
Pneumatic sequencing
Applications requiring two simultaneous pneumatic signals
Available Models
ST-01: Shuttle valve, 1/8" BSP, 7.5mm²
ST-02: Shuttle valve, 1/4" BSP, 21mm²
STH-01: Double pressure valve, 1/8" BSP, 14mm²
Optional NPT and Rc thread versions are available.
Quality & Reliability
The ST / STH Series provides a simple mechanical solution for pneumatic signal logic without requiring electrical switches, solenoids or electronic control.
Robust aluminium construction, compact dimensions and straightforward pneumatic operation provide reliable long-term service in industrial automation, machinery and compressed air control systems.
Technical Information
Valve types: Shuttle valve and double pressure valve
Logic functions: OR (ST) and AND (STH)
Port sizes: 1/8" and 1/4" BSP according to model
Operating pressure: 0.8 to 10 Bar
Test pressure: 10 Bar
Media: Filtered compressed air
Body: Aluminium alloy
Temperature range: -10°C to +80°C
Electrical power: Not required
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