CB/T692 Marine Ship Dual Breathing Valve for Vessel Pressure Control and Tank Ventilation

The CB/T692 Marine Dual Breathing Valve is engineered for commercial vessels to maintain safe atmospheric pressure inside fuel, oil, and cargo tanks. By allowing controlled air intake during tank emptying and exhaust during filling, it prevents structural damage from overpressure or vacuum—critical for protecting crew safety and cargo integrity. Designed to comply with CB/T692 Chinese marine standards and compatible with global classification societies (CCS, ABS, DNV, GL, LR, NK, KR, BV), this valve offers unmatched reliability in corrosive saltwater environments. Constructed from high-strength cast iron (or ductile iron, based on variant), it features a robust piston-style mechanism that ensures smooth, responsive operation even under extreme wave motion. The manual operation design allows for straightforward maintenance and adjustment, while the compact, bolted bonnet structure simplifies installation on deck or bulkhead. With its corrosion-resistant coating and precision-machined components, this valve delivers long service life with minimal upkeep—reducing downtime and operational costs for ship operators. Whether for new builds or retrofits, it’s the trusted solution for marine tank ventilation.

Key Features​

• CERTIFIED COMPLIANCE: Meets CB/T692 marine standards and supports CCS, ABS, DNV, GL, LR, NK, KR, BV certifications for global vessel compatibility.
• DUAL-CHAMBER DESIGN: Allows simultaneous pressure equalization and vacuum relief, preventing tank deformation and ensuring safe cargo handling.
• DURABLE CONSTRUCTION: High-strength cast iron body resists corrosion and mechanical stress in harsh marine environments.
• EASY MAINTENANCE: Manual operation with accessible internals simplifies inspection, cleaning, and part replacement without specialized tools.
• VERSATILE APPLICATION: Suitable for fuel, oil, and potable water tanks across commercial ships, yachts, and offshore platforms.

Applications​

• Commercial Shipping: Protects fuel/oil tanks on cargo vessels, tankers, and bulk carriers from pressure-related damage.
• Naval & Offshore: Ideal for naval ships, floating platforms, and offshore support vessels operating in high-salinity environments.
• Yacht & Passenger Craft: Ensures safe ventilation for leisure boats and cruise ships with strict safety and space constraints.
• Shipyards & Refitters: Reliable retrofit or new-build solution for upgrading marine tank safety systems.

Specifications​

Functions & Advantages​

• PRESSURE REGULATION: Automatically balances internal tank pressure to prevent rupture or collapse.
• CORROSION RESISTANCE: Epoxy-coated cast iron resists saltwater and chemical degradation.
• SPACE-EFFICIENT: Compact design fits tight deck or engine room layouts.
• COST-EFFECTIVE: Reduces maintenance frequency and extends tank service life.

Certifications​

• Compliant with CB/T692 Chinese Marine Valve Standard.
• Supports certification from CCS, ABS, DNV, GL, LR, NK, KR, BV (upon request).