Stop Fittings
Shut-off Fitting: Definition, Working Principle, Applications, Specifications, and Safety Advantages
In the field of automation equipment, pneumatic control modules and industrial air-line systems, shut-off fittings are critical safety connectors designed for enhancing operational safety and maintenance efficiency. They shut off airflow instantly during tube removal, preventing sudden pressure loss and ensuring safety in automated production lines.
Regional Terms for Stop Fittings (Shut-off Fittings)
In automation-grade One Touch Fittings, regional naming differs, but the core purpose is the same—automatic shut-off and safer operation.
Americas, Europe, Australia, and Middle EastCommon terms include Shut-off Fitting, Shut-off Valve, or Self-sealing Fitting, emphasizing the safety function of automatically blocking airflow to prevent sudden discharge.
JapanOften referred to as:
- ストップ継手（Stop-tsugite）
- ワンタッチ止め継手 (One-touch Stop Fitting).
These highlight automatic air shut-off during tube removal, widely used in assembly lines, pneumatic modules, and motion-control equipment.
Southeast AsiaTypically called Stop Valve or Pneumatic Shut-off Valve, aligned with international procurement terminology and compatible with global equipment standards.
How a Stop Fitting Works (Automatic Shut-off During Tube Removal)
When a tube is inserted, the internal valve opens automatically to allow smooth airflow. When the tube is removed, the mechanism instantly closes the air path, providing:- Prevention of sudden pressure discharge
- Reduced risks of blowout, noise, or rebound
- No need to shut down the main air supply during maintenance
- No pressure drop across the entire system
Stop Fitting vs. Standard Push-in Fitting
|
Comparison Item |
Stop Fitting | Standard Push-in Fitting |
| Air release upon tube removal | ✘ Automatically sealed (no exhaust) | ✔ Air instantly vents |
| Need to shut off main air line for maintenance | ✘ Not required | ✔ Required |
| Safety level | High | Standard |
| Typical applications | Automation lines, safety control modules | General pneumatic equipment |
| Pressure stability | Maintains stable line pressure | Higher risk of pressure drop |
Adding Stop Fittings is equivalent to giving each workstation an extra layer of pneumatic safety protection.
Key Features and Technical Advantages of SHPI Stop Fittings
The SHPI Stop Fitting Series ensures safe, stable, and efficient pneumatic operation during both production and maintenance activities.
1. Automatic Shut-off Design
Instant sealing upon tube removal—no need to shut down the entire air line.
Faster maintenance, higher safety, and zero unplanned downtime.
2. Clear Flow-Direction Markings
Clear engraved flow-direction and shut-off indicators enable quick, error-free installation and effectively prevent accidental pressure release or reverse connection.
3. Multiple Sizes for Perfect Tube Compatibility
Available in 4, 6, 8, 10, and 12 mm.
For optimal sealing performance, SHPI recommends pairing with SHPI-manufactured tubing:
- Polyurethane Tubing (PU)
- Nylon Tubing (Nylon 6 / Nylon 12)
- LDPE Tubing
- Flame-retardant Tubing (UL-94 Series)
Stop Fittings are widely used in:
- Automation workstations
- Robot EOAT (End-of-Arm Tooling)
- Pneumatic control modules and control boxes
- Clamping fixtures, testing stations, and jig systems
- Production lines requiring frequent maintenance or localized air shut-off
Contact the SHPI Team
Whether you are searching for Stop Fittings, Shut-off Fittings, or other high-safety pneumatic connectors,
SHPI delivers reliable, proven solutions to help your production line achieve maximum safety, stability, and efficiency.
✅ Need technical support, OEM, or ODM solutions? Contact the SHPI team today!
