Description
The bottle head valve assembly on the fire-fighting and life-saving cylinders of ships is the core component of the fixed fire-fighting system, responsible for sealing and pressure maintenance, emergency release, and safety protection.
Type
1. Classified by closed form
• Mechanical sealing type: The bottle opening is sealed by a mechanical structure, such as a pressure block + valve stem type (UNITOR type) or a spring + valve disc type (NK type).
• Diaphragm-sealed type: The bottle opening is sealed by a diaphragm, such as the vertical diaphragm rupture type (KAWASAKI type) and the horizontal diaphragm rupture type.
2. Classified by driving mode
• Manual + pneumatic diaphragm type: It is centered around pneumatic diaphragm actuation, supplemented by manual drive lever for emergency operation.
• Pneumatic piston type: It is centered around pneumatic piston drive, with manual pressing block as a backup.
3. Classified by opening method
• Manual opening: Cable-pull type, rotary type, manual bottle-by-bottle opening, etc.
• Pneumatic opening: Pneumatic piston lever type, pneumatic piston cable type, pneumatic membrane rupture type, etc.
Material Compatibility with Corrosion Resistance
Main material: 316 stainless steel
Scene value: Resistant to marine high salt spray and high humidity corrosion, not prone to rusting after long-term use, suitable for wet and corrosive environments such as ship decks/engine rooms.
Execution Standard
Conforms to standard: JIS 2T (General Standard for Marine Equipment).
Scenario value: It meets the safety and compatibility specifications for ship equipment and can be directly incorporated into the compliant configuration of ship fire fighting/lifesaving systems.
Adaptive Ship System
Compatible objects: Marine fire extinguishing cylinders (CO₂ fire extinguishing system), marine survival cylinders (emergency breathing apparatus).
Interface specification: G5/8 (compatible with mainstream marine cylinder interfaces).
Core Parameters
Working pressure: ≥20MPa (meeting the pressure requirements of high-pressure gas cylinders on ships).
Seal leakage rate: ≤1×10⁻⁷ Pa・m³/s (compliant with the high seal safety standards for marine gas circuit systems).
Operational Adaptability
Built-in pressure gauge range: 0-25MPa (compatible with the pressure range of ship's gas cylinders, facilitating daily inspections by crew members).
Operation mode: Knob-type quick opening and closing (suitable for quick operation needs in emergency situations on ships).
Daily Maintenance and Inspection
Daily inspection (daily for navigation/berthing)
• Visual inspection: The valve body is free from rust, deformation, and leakage, the handle/drive rod is not stuck, and the safety pin is intact.
• Pressure monitoring: The pressure gauge displays within the normal range, with no zeroing or fluctuations.
• Sealing inspection: No frosting (characteristic of CO₂ leakage), no air leakage sound, and the connections are secure.
Regular maintenance (monthly/annual)
• Cleaning and maintenance: Remove oil stains and rust from the valve body, and apply anti-rust grease.
• Function test: Manually operate the starting mechanism to ensure there is no jamming, and the pneumatic pipeline is free from damage or detachment.
• Safety verification: Safety diaphragms must be verified periodically, and must be replaced if they are expired or damaged.
• Seal replacement: Aging sealing rings and valve disc seals need to be replaced in a timely manner.
Common fault handling
• Minor leakage: Tighten the connection or replace the seal.
• Valve core stuck: Disassemble and clean the valve body. Violent knocking is prohibited.
• Safety diaphragm burst by mistake: Immediately replace the diaphragm and investigate the cause of overpressure in the cylinder.
