Explosion Protection Isolation Valve

Product Details

Overview

The interconnection of process equipment via piping is standard in many industries. This connectivity, however, creates a pathway for explosion propagation if an incident occurs in one vessel, such as a hopper or collector. The resulting flame and pressure can rapidly travel to adjacent units, amplifying the initial event into a far more severe secondary explosion. Implementing an explosion protection isolation valve breaks this pathway, effectively compartmentalizing the hazard and safeguarding linked equipment and personnel.

This device acts as an automatic firebreak within pipeline systems. It is specifically engineered to prevent the dangerous reverse flow of explosions, serving as a final protective barrier for downstream installations and contributing significantly to overall plant safety strategy.

Salient Features

• Immediate Hazard Response: Capable of reacting to the incipient pressure rise of an explosion with extreme speed, securing the flow path before the flame front arrives.

• Broad Application Suitability: Constructed from selected high-performance materials, the valve maintains integrity across a wide range of temperatures, pressures, and in the presence of common industrial dusts and mild corrosives.

• Practical Design for Integration: Its relatively lightweight and streamlined form factor eases handling during installation and reduces structural support requirements.

• Connectivity for Modern Plants: Higher-tier versions offer digital output signals for integration into Distributed Control Systems (DCS) or Safety Instrumented Systems (SIS), enabling centralized status awareness.

Performance in Explosion Isolation
Leveraging a balanced disc design and a sensitive, low-inertia trigger system, the valve achieves closure times that meet rigorous international standards for explosion isolation devices. This performance is validated to contain explosions with high efficiency, directly reducing potential damage and business interruption. In a scenario like a pneumatic conveying line handling combustible material, the valve's rapid action can isolate a silo from a fire in the conveying duct.

Dependability for Continuous Operation
Selected stainless steel grades and precise manufacturing ensure the valve can endure the dynamic conditions of industrial environments. This focus on durability results in a product known for its long operational life and consistent readiness, minimizing unscheduled downtime.

Minimal Impact on Process
The default state of the valve is fully open, engineered to impose negligible pressure drop on the system during normal material transfer. This ensures that production rates and energy consumption are not adversely affected, while the safety function remains instantly available when needed.

Hazardous Area Certified Enclosure
Certified Blast Initiation Sensor

Mode of Operation

The functional sequence is based on the physical phenomenon where the pressure pulse from an explosion outruns the actual flame. The valve incorporates a sensor tuned to this initial pressure spike. Activation of this sensor releases the disc, allowing it to swing shut under controlled force. A positive mechanical lock then engages, holding the disc securely closed to withstand the sustained pressure and block flame penetration.

After an incident has been safely resolved, the valve is designed for straightforward resetting by trained personnel. A basic inspection to ensure no damage and clear the flow path is sufficient for reactivation. During standard operation, a small solenoid or permanent magnet arrangement counteracts gravity/friction to keep the disc open.

Technical Data Sheet

Pipe Size (DN)                             Overall Dimensions L × W × H (mm)    ATEX / IECEx Rating (Equivalent)

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 Equipment

Explosion Event Sensor: Type HE (High-Energy detection)

Instructions for Operation and Upkeep

• System Integrity Check: Always confirm the valve is verified "OPEN" before initiating any process that induces flow through the protected pipeline. Operating fans or blowers against a closed valve can lead to immediate equipment failure.

• Preventive Maintenance Schedule: Institute a regular maintenance plan with a minimum interval of one month. In systems with high dust loading, pulsating flow, or frequent starts/stops, consider more frequent inspections of the moving parts and latch.

• Verification Post-Service: Any maintenance intervention should conclude with a functional test to ensure proper opening, closing, and latching action, with findings documented in the equipment log.

About Our Company

Shandong Zhengda Weiye Safety Equipment Co., Ltd. is a recognized specialist in the field of industrial safety, concentrating on pressure relief and explosion protection technologies. We combine in-house R&D with practical engineering to develop reliable products.
Our manufacturing scope covers a suite of safety devices: from rupture discs and conventional safety valves to advanced explosion isolation and suppression systems.
Based in Jinan, our facility is equipped for the full production cycle, from design to testing. We pride ourselves on offering tailored solutions and have assisted numerous enterprises in achieving compliance with safety regulations. Our commitment to quality and safety is underscored by our possession of the Chinese Special Equipment Manufacturing License, ISO 9001 certification, and applicable explosion-proof product certifications for our range.