Gate Valve Cast Iron JIS 5K - F7363

JIS 5K F7363 Cast Iron Gate Valve

Flanged cast iron gate valve for isolation in marine and industrial piping systems, manufactured to JIS F 7363-1996. Pressure class is JIS 5K; pressure testing per JIS F 7400-1996. Designed for fully open or fully closed operation; not suitable for throttling or continuous flow regulation.

Technical Specifications

• Connection: Flanged JIS 5K
• Sizes: DN50 to DN450
• Body/Cover: FC200 / HT200 cast iron
• Disc: FC200 / HT200
• Seats: BC6 bronze or SCS2 / 2Cr13
• Stem: C3771BD brass or SUS403
• Gland: bronze / brass / carbon steel
• Gasket: non-asbestos

Test Pressures

For sizes up to DN400: shell test at 1.05 MPa, seat test at 0.77 MPa. For DN450 to DN600: shell test 0.75 MPa, seat test 0.55 MPa.

Typical Applications

• Ballast and bilge systems
• Low-pressure seawater or freshwater lines
• Ship cooling circuits
• Pump manifolds and isolation lines
• Shipbuilding installations with JIS standardization

Selection Criteria

JIS 5K F7363 is specified for isolation of larger diameter lines where low pressure drop is required in the open position. For frequent flow regulation, vibration, or high flow velocity, alternative valve types or seat configurations should be considered.

Maintenance

Inspection should verify seat tightness, gasket condition, stem operation, and flange corrosion. In seawater service, assess galvanic compatibility of materials and select gaskets accordingly.

FAQ

When is this preferred over a bronze valve?
For larger diameters and JIS 5K networks where cast iron construction is acceptable for the operating conditions.

Is it suitable for flow regulation?
No. This is an isolation valve, not a control valve.

What is the main usage limitation?
The JIS 5K pressure class and test pressures must match the system design pressure.