Explosion-Proof Isolation Safety Valve

Product Details

Overview and Purpose

Modern industrial facilities often comprise networks of interconnected vessels and ducting. While efficient for processing, this connectivity introduces a significant risk: an explosion in one unit can propagate flame and overpressure through these conduits to neighboring equipment, resulting in devastating secondary events. The deployment of an explosion-proof isolation safety valve is a primary defense mechanism, designed to sever this pathway instantaneously, thereby containing the initial incident and safeguarding interconnected plant areas and personnel.

This engineered safety component serves as an automatic fire block within industrial conveyance systems. Its fundamental objective is to detect and arrest the reverse travel of explosive pressure and flame through pipelines, acting as a critical safeguard for downstream assets and contributing to a facility's overall layer of protection analysis (LOPA).

Core Product Attributes

• Instantaneous Hazard Mitigation: Designed to react to the initial overpressure pulse of an explosion, achieving full closure in milliseconds to block the ensuing flame front.

• Construction for Challenging Environments: Manufactured from robust, selected alloys, the valve maintains operational integrity across a spectrum of temperatures, pressures, and in corrosive or dust-laden atmospheres.

• Engineered for Practicality: A compact and relatively lightweight design simplifies integration into new or existing piping layouts and reduces structural support demands.

• Smart Functionality: Advanced configurations offer digital feedback (e.g., open/close status signals) for seamless integration into plant-wide safety instrumented systems (SIS) or control rooms.

Superior Containment Capability
The valve's effectiveness is rooted in its low-inertia flap and highly sensitive release mechanism, enabling it to meet stringent industry response time criteria. This rapid action is proven to contain explosions with high efficiency, directly limiting potential asset damage and operational downtime. For instance, in a spray drying process handling flammable powders, the valve can isolate the dryer from a duct-borne fire.

Durability for Demanding Service
The use of corrosion-resistant materials and precision manufacturing ensures long-term reliability in harsh operating conditions. This focus on durability translates to extended service intervals, predictable maintenance, and a lower total cost of safety ownership.

Minimal Process Interference
During normal operation, the flap is secured in the fully open position, engineered to introduce negligible flow resistance. This ensures that system performance metrics—such as conveyance rate and fan energy consumption—remain optimal, while the safety function remains passively ready.

Hazardous Location Certified Enclosure
Approved Pressure Rise Detector

Function and Sequence of Operation

The valve operates on the principle that the pressure wave from an explosion travels faster than the flame. It incorporates a sensor calibrated to this initial pressure spike. Upon detection, the sensor triggers the release of the holding mechanism, allowing the flap to swing shut under controlled force. A positive-action mechanical lock then engages, securing the flap in the closed position to withstand sustained pressure and block flame penetration.

Following an incident and after the area is declared safe, the valve can be manually reset by authorized personnel. A basic visual inspection and functional check are recommended prior to returning the system to service. During standard operation, a low-energy system (e.g., a small magnet) maintains the flap in the open position.

Technical Specifications and Dimensions

Nominal Diameter (DN)             External Footprint L × W × H (mm)   Explosion Protection Level

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    

Optional Accessories

Blast Initiation Sensor: High-Energy (HE) Detection Type

Operating and Maintenance Guidelines

• Pre-Startup Verification: Always verify the valve flap is in the confirmed "OPEN" position before activating any equipment that will create flow through the protected pipeline section.

• Scheduled Preventive Maintenance: Establish a routine inspection program with a minimum monthly frequency. In environments with high particulate loading or vibration, consider more frequent checks of the moving components and latch mechanism.

• Post-Service Validation: After any maintenance activity, perform a full operational cycle test (open-close-latch) to ensure proper functionality before system recommissioning.

Manufacturer Information

Shandong Zhengda Weiye Safety Equipment Co., Ltd. is a specialized provider of industrial safety solutions, with a core focus on explosion protection and pressure relief technology. We develop and manufacture a comprehensive range of safety devices.
Our product lineup includes precision rupture discs, safety and relief valves, flame arresters, and complete explosion isolation systems.
Operating from our facility in Jinan, we combine R&D with disciplined manufacturing to deliver reliable products. We have a proven track record of assisting enterprises in meeting safety compliance requirements. Our commitment is validated by holding the Chinese Special Equipment Manufacturing License, ISO 9001 Quality Management System certification, and relevant national explosion-proof product approvals.