Explosion Decoupling Flap Valve
Material Specification: Body: Carbon Steel / Sealing Flap: Stainless Steel
Pressure Differential: Does not exceed 500 Pa at a reference flow speed of 25 m/s
Allows for field maintenance without the requirement to detach the valve from the pipeline
Configured for standard horizontal mounting; arrangements for vertical flow orientation are possible
Utilizes a fail-safe open flap principle; optional high-dynamic pressure switch provides closure status indication
Fitted with an over-center locking device to ensure stable closure
Actuation is performed by a magnetic trip mechanism for exceptional speed
The internal duct profile is designed to minimize turbulence and areas for dust accumulation
Product Details
Application Context
In powder and bulk handling industries, equipment such as silos, cyclones, and bag filters are linked by extensive ductwork. This creates a continuous volume where a primary explosion in one location can rapidly expand through connected spaces. An explosion decoupling flap valve is engineered to interrupt this propagation path. By instantly closing upon detection of an explosion, it effectively decouples interconnected volumes, preventing a localized event from escalating into a plant-wide catastrophe.
This safety device acts as a critical isolation point within process and exhaust ducting. Its primary function is to automatically create a physical barrier against the passage of explosion flames and pressure, thereby protecting downstream installations and personnel.
Key Design and Performance Features
Explosion Propagation Blockage: Capable of detecting the initial pressure rise associated with an explosion and commanding full closure within a few milliseconds, effectively blocking the flame path.
Suitability for Diverse Conditions: Constructed from materials selected for durability, offering resistance to wear, temperature extremes, and chemical exposure common in industrial settings.
Compact and Accessible Design: The valve's form factor is optimized for easy integration into piping runs, and it typically includes inspection openings for internal component access.
Integration with Control Systems: For monitoring purposes, the valve can be equipped with position sensors that transmit open/closed status to a central control panel or safety PLC.
Performance in Hazard Containment
The valve’s rapid closure is achieved through a low-mass flap and a highly responsive triggering device. This performance is essential for meeting the isolation requirements outlined in international safety standards for dust and gas explosion protection. Its deployment is a key mitigation measure in facilities processing combustible materials like flour, sugar, or metal powders.
Engineered for Reliability and Service Life
Manufactured with a focus on robustness, the valve is built to withstand the mechanical and environmental stresses of industrial operation, ensuring long-term performance and reducing the need for frequent replacement.
Non-Restrictive to Normal Operation
Under standard, non-hazardous conditions, the flap is maintained in a fully open position, presenting minimal obstruction to airflow or material conveyance. This ensures the valve does not adversely affect system pressure balance or energy efficiency during normal production.
Flameproof Enclosure for Electrical Components
Intrinsically Safe Detection Sensor Assembly
Principle of Operation
The valve operates on the detection of the pressure wave preceding an explosion's flame front. A specialized sensor, mounted on or near the valve, is tuned to recognize this rapid pressure increase. Upon detection, it triggers the release of the flap. The flap then rotates to its sealed position, where it is secured by a mechanical latch designed to withstand the remaining explosion forces.
Post-incident, the valve is designed for simple manual resetting once conditions are safe. A basic functionality check is recommended. During normal operation, the flap is held open by a low-energy system, such as a permanent magnet or a light spring.
Dimensional Data and Certifications
Nominal Size (DN) Valve Dimensions L × W × H (mm) Explosion Performance Rating
DN100 409 × 324 × 497 ST1, ST2
DN150 587 × 386 × 550 ST1, ST2
DN200 587 × 386 × 550 ST1, ST2
DN250 628 × 443 × 624 ST1, ST2
DN300 778 × 507 × 693 ST1, ST2
DN350 868 × 641 × 788 ST1, ST2
DN400 946 × 641 × 813 ST1, ST2
DN450 1093 × 795 × 922 ST1, ST2
DN500 1093 × 795 × 922 ST1, ST2
DN550 1240 × 885 × 1020 ST1, ST2
DN600 1240 × 885 × 1074 ST1, ST2
DN650 1300 × 989 × 1191 ST1
DN700 1390 × 989 × 1191 ST1
Supplementary Device
Explosion Event Detector: Type HE (Standard High-Energy)
Instructions for Safe Operation and Maintenance
Operational Readiness Check: Prior to starting any process that induces flow, ensure the valve flap is verified to be in the open position and unobstructed.
Periodic Maintenance Schedule: Conduct regular inspections at intervals not exceeding one month, or more frequently as dictated by service conditions (e.g., high dust loads, moisture).
Functional Test Post-Service: After any inspection or maintenance task, verify the valve's proper operation through a manual test cycle and document the results.
Corporate Overview
Shandong Zhengda Weiye Safety Equipment Co., Ltd. is a technology-driven enterprise dedicated to enhancing industrial safety through innovative product design and manufacturing in the field of pressure relief and explosion protection.
We offer a wide array of safety products, including rupture discs, relief valves, flame arresters, and specialized explosion isolation valves.
Based in Jinan, our operations are supported by a skilled engineering team and modern production facilities. We are committed to providing effective safety solutions and hold necessary certifications including the Chinese Special Equipment Manufacturing License and ISO 9001 accreditation.
