Products Description
The enclosed spring full-lift safety valve serves as critical overpressure protection equipment for pressure vessels, boilers and industrial piping systems. Its totally encapsulated spring design separates the spring from process media, eliminating corrosion, scaling and sticking issues that would degrade spring elasticity. When system pressure reaches the calibrated setpoint, the disc opens fully to discharge media at a large flow rate and rapidly depressurize the system to safeguard equipment from damage.
Featuring an internal spring structure with no exposed components, this valve maintains consistent performance in corrosive, damp or dusty environments. It features accurate pressure actuation, reliable sealing and extended service longevity, making it perfectly suited for piping systems carrying steam, gas and mildly corrosive liquids.
Four Core Advantages
Closed Spring Anti-Corrosion Design
The spring is fully sealed inside the bonnet and separated from process media, preventing rust, medium adhesion and performance attenuation, suitable for harsh corrosive working environments.
Full-Lift Large-Flow Pressure Relief
Full-lift structure achieves maximum opening stroke instantly under overpressure, with large discharge capacity to rapidly eliminate excess system pressure.
Stable Sealing & Low Leakage
Precision matched spring and polished sealing surface maintain tight sealing under rated working pressure, effectively reducing medium loss.
Wide Application Compatibility
Works well for steam, air, nitrogen and mildly corrosive liquids; widely used in chemical, power, heating and pressure tank systems.
Working Principle
Under regular operating pressure, spring pre-tension tightly presses the disc against the seat and stops medium leakage. If pressure rises above the designated level, medium force lifts the disc wide open for rapid, high-flow pressure relief. As pressure returns to a safe level, the spring drives the disc back to its sealing position automatically. The fully encapsulated bonnet permanently shields the spring from medium corrosion.
Product Detailed Features
Totally enclosed design isolates internal core components from outside moisture and pollutants, greatly extending service life.
Adopts fine grinding process for sealing surface, achieving ultra-tight sealing performance and resisting medium scouring.
Made of high-quality spring steel with stable elasticity, small pressure error and no fatigue deformation after long-term operation.
Compact and sturdy structure, resistant to high pressure and impact, not easy to deform or crack.
Compliant with international standard flange and thread sizes, easy to install, replace and maintain.
Each valve is individually pressure tested and calibrated to ensure accurate opening and reset pressure.
Main Technical Parameters
| Item | Specification |
|---|---|
| Product Name | Closed Spring Full Lift Safety Valve |
| Size Range | DN15-DN200 |
| Pressure Grade | PN16/PN25/PN40, Class150/300 |
| Applicable Media | Steam, air, nitrogen, mild corrosive fluid |
| Connection | Flanged / Threaded optional |
| Body Material | Cast iron, WCB, stainless steel |
| Executive Standard | GB, API, ASME |
Certifications
ISO certification is not just a mandatory qualification threshold, but a full demonstration of our quality standards, compliance performance and competitive edges, accelerating our upgrade from low-end manufacturing to high-end standardized manufacturing.
Company Profile
ISO certification is not just a mandatory qualification threshold, but a full demonstration of our quality standards, compliance performance and competitive edges, accelerating our upgrade from low-end manufacturing to high-end standardized manufacturing.
FAQ
FAQ
Q: What is the difference between closed spring and open spring safety valves?
A: Closed type covers the spring with a full bonnet to isolate media, which protects the spring from corrosion. Open spring valves expose the spring and are only fit for clean, dry media without corrosivity.
Q: What media suits this closed safety valve?
A: It fits steam, compressed air, nitrogen and weakly corrosive gas/liquid, especially recommended for chemical, humid and dusty pipeline systems.
Q: Can the set opening pressure be customized?
A: Yes. We adjust and calibrate spring pressure according to customers' actual working conditions.
Q: What quality guarantee do you provide?
A: All valves are produced under ISO 9001 system. Each unit passes shell strength, sealing and opening pressure tests before shipment.
Q: Where is this valve commonly used?
A: Industrial boilers, pressure storage tanks, thermal power plants, chemical pipelines, pharmaceutical and metallurgical pressurized equipment.
Hot Tags: closed spring full lift safety valve, China closed spring full lift safety valve manufacturers, suppliers, factory
