Swing check valve Angle Bronze 16K - F7418 (Union Bonnet Type)

Bronze Angle Lift Check Valve JIS 16K F7418

Angle pattern lift check valve with union bonnet, designed for marine auxiliary piping systems where prevention of reverse flow and a 90° change in piping direction are required. Although the category title may reference a swing type, the technical specification refers to a Bronze 16K Lift Check Angle Valve – Union Bonnet Type.

Standards and Testing

• Design standard: JIS F7418-1996
• Test standard: JIS F7400-1996
• Flange class: JIS 16K
• Body hydrostatic test: 3.3 MPa
• Seat test: 2.42–0.4 MPa

Construction and Materials

• Body: BC6 bronze
• Bonnet: BC6 bronze
• Disc: BC6 bronze
• Gasket: Non-asbestos
• Bonnet type: Union bonnet
• Sizes: DN15 to DN40

The union bonnet design allows access to the disc, seat, and bonnet gasket for inspection or cleaning, provided sufficient maintenance clearance is available above the valve.

Dimensions

Available in small diameters: DN15, DN20, DN25, DN32, DN40. Face-to-face length (L) ranges from 70 mm to 100 mm; overall height (H) from 56 mm to 69 mm, depending on DN.

Operation and Selection

Disc lifts under differential pressure during normal flow and reseats when flow decreases or backpressure occurs. The angle pattern eliminates the need for a separate elbow fitting. Flow direction, available differential pressure, and installation orientation must be verified during selection.

Typical Applications

• Shipboard auxiliary water lines
• Fresh water and service water systems
• Small pump discharge lines
• Piping with JIS 16K flanges
• Locations requiring 90° flow direction change

Maintenance

Periodic inspection should include seat cleanliness, free disc movement, gasket condition, and leak-tightness under reverse pressure. Increased inspection frequency is recommended for water with dissolved salts or suspended solids.