Product Overview
The Lever Type Spring Full Lift Safety Valve is a critical overpressure protection component for pressure vessels, boilers and pressurized piping systems. Relying on spring pre-tightening force to maintain sealing under normal working pressure, it will fully pop open for large-flow medium discharge once system pressure hits the preset safety value, quickly releasing excess pressure to prevent equipment rupture or safety accidents caused by overpressure. Built with an external manual wrench structure, operators can manually lift the valve disc regularly to test valve flexibility, prevent jamming and ensure reliable emergency action. With sensitive opening response, stable sealing performance and high discharge capacity, this full-lift safety valve meets mainstream international safety specifications, widely adopted in steam, gas and liquid pressure control systems across multiple industries.
Four Core Advantages
Large Flow Full-lift Pressure Relief
Adopts full-lift structural design. When overpressure occurs, the valve disc opens completely in an instant to deliver large exhaust volume, rapidly lower pipeline pressure and offer reliable overpressure protection for pressure-bearing equipment.
Manual Wrench Test Function
Equipped with an external operating lever. Users can manually lift the valve disc for regular on-site inspection without system shutdown, effectively avoiding valve sticking, rusting and malfunction after long-term static use.
Precise & Stable Spring Setting Pressure
High-precision matched spring provides stable opening pressure value, with small pressure deviation. It keeps tight sealing under rated working pressure, free from frequent leakage and medium loss.
Wide Medium & Scenario Adaptability
Compatible with saturated steam, compressed air, nitrogen and general low-corrosion liquid. Suitable for boilers, pressure tanks, heating pipelines, chemical and power industrial pressure systems.
Working Principle
Under normal operating pressure, the spring compression force presses the valve disc tightly against the valve seat to realize reliable sealing, stopping medium leakage. When pipeline pressure rises above the pre-set opening pressure, medium thrust overcomes spring tension to jack up the disc fully, discharging surplus medium at high flow to reduce system pressure. Once pressure falls back within safe range, spring force pushes the disc back to close automatically. The matched hand wrench allows periodic manual lifting check to guarantee flexible valve action in emergency overpressure situations.
Key Product Features
- Full-lift structure for fast, high-capacity pressure relief
- External lever for regular manual function test
- Adjustable preset opening pressure with high precision
- Excellent sealing property, low leakage rate under working pressure
- Robust casting body, wear-resistant seat for long service life
- Multiple material options for different medium corrosion requirements
- Compliant with national and international pressure safety valve standards
Application Range
Industrial & civil steam boilers
01
Pressure storage tanks, air receiver tanks
02
Central heating, thermal power plant steam pipelines
03
Petrochemical, metallurgy, pharmaceutical pressurized equipment
04
Compressed air stations, gas transmission piping systems
05
Products Description
| Product Name | Lever Type Spring Full Lift Safety Valve |
| Nominal Size | DN15 ~ DN200 |
| Pressure Class | PN16, PN25, PN40, Class150, Class300 |
| Setting Pressure Range | Customizable according to customer requirements |
| Applicable Medium | Steam, air, nitrogen, water and mild corrosive fluids |
| Connection Type | Flanged / Threaded optional |
| Main Body Material | Cast iron, WCB carbon steel, stainless steel |
| Test Standard | GB, API, ASME safety valve inspection standards |
Company Profile
SND is a leading enterprise engaged in the R&D, production and sales of high-performance hydraulic control valves and professional fluid system solutions. Relying on internationally authorized patented technologies and external technical cooperation resources, the company strictly implements the ISO 9001 full-process quality management system, strives to realize zero-defect product manufacturing, and has become a benchmark enterprise in the valve manufacturing sector.
The company adopts advanced automated production technology and integrated standardized management mode to guarantee stable and reliable product quality, and its products have obtained official approval from China's construction competent departments. Supported by a nationwide sales and after-sales service layout, we persist in technological innovation and research and development of new-generation valve products, so as to provide stable, efficient and internationally competitive fluid control solutions for global customers.
FAQ
FAQ
Q: What is a full-lift safety valve?
A: Different from micro-lift safety valves, the full-lift design enables the valve disc to open fully and instantly once reaching the set pressure. It provides large-flow exhaust and rapid pressure relief, offering faster and more reliable overpressure protection for pressure vessels and pipelines.
Q: What is the function of the lever (wrench)?
A: The external lever allows regular manual lifting tests. It effectively prevents valve sticking, rusting or failure caused by long-term static operation, ensuring the valve can respond sensitively in emergency overpressure conditions.
Q: What media can this valve be used for?
A: It is suitable for saturated steam, compressed air, nitrogen, clean water and other mild-corrosion media. It is widely used in boilers, steam pipelines, pressure tanks and industrial pressurized systems.
Q: Can the opening pressure be customized?
A: Yes. We can customize and calibrate the set pressure according to customer's working pressure requirements to match different equipment and pipeline standards.
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