Flowstar is the UK’s largest stockist of safety valves and safety relief valves, offering a comprehensive range for immediate despatch. All in-stock valve orders are shipped the same day when placed before 5pm (4:30pm on Fridays), ensuring fast and reliable delivery across the UK. For resellers and businesses purchasing valves regularly, Flowstar provides competitive trade discounts on listed prices. To discuss pricing or place an order, contact our team at sales@flowstar.co.uk or call 01482 601030 today.
Safety valves are critical protective devices used in pressurized systems to automatically release excess pressure and prevent equipment failure, explosions, or system damage.
What is a Safety Valve?
A safety valve is a fail-safe valve designed to open automatically when the pressure within a system exceeds a preset limit. Once the pressure returns to safe levels, the valve closes again.
They are essential for protecting pressure vessels, pipelines, boilers, compressors, and other pressure-retaining equipment.
Types of Safety Valves
- Spring-Loaded Safety Valves
- Uses a spring to keep the valve closed until set pressure is exceeded.
- Most common in steam, air, and gas systems.
- Pilot-Operated Safety Valves
- Uses a pilot valve to control the main valve.
- Provides more precise control; often used in high-capacity or high-pressure applications.
- Balanced Safety Valves
- Designed to remain accurate even with backpressure in the discharge line.
- Thermal Safety Valves
- Specifically designed to relieve excess pressure from thermal expansion (e.g., in closed water heaters).
Applications
- Boilers and pressure vessels (mandatory by safety codes like ASME)
- Compressed air and gas systems
- Chemical processing
- Cryogenics
- Oil and gas pipelines
- Water heaters and steam systems
Differences Between a Safety Valve and a Relief Valve
| Feature | Safety Valve | Relief Valve |
|---|
| Purpose | Sudden, full release to prevent danger | Gradual pressure relief for control |
| Activation | Opens fully at set pressure | Modulates opening based on pressure |
| Typical Use | Steam, air, gas | Liquids, hydraulic systems |
Key Benefits
- Prevents catastrophic failures.
- Complies with safety codes (e.g., ASME, API).
- Protects both people and equipment.