Gate Valve Cast Steel JIS 5K - F7366

JIS F7366 Cast Steel Gate Valve

The product page specifies a cast steel gate valve, JIS F 7366 type, with a nominal pressure rating of 10K, despite the URL referencing “5K”. For technical documentation, reference the displayed standard and test data provided on the page.

Technical Specifications

• Design standard: JIS F 7366-1996
• Test standard: JIS F 7400-1996
• Pressure class: JIS 10K
• Connection: flanged
• Body material: SC450 cast steel
• Bonnet: SC450
• Disc: SC450
• Seats: BC6 or SCS2
• Stem: CA771BD or SUS403
• Packing gland: BC6
• Gasket: non-asbestos
• Handwheel: FC200
• Sizes: DN50 to DN300

Test Pressures

Hydrostatic shell test: 2.1 MPa. Seat test: 1.54 MPa. These values should be correlated with system design pressure, operating temperature, and classification society or project specification requirements.

Applications

Cast steel construction is used in marine piping systems where higher mechanical strength is required compared to cast iron. Typical applications include:

• freshwater and auxiliary lines,
• cooling systems,
• pump manifolds,
• isolation in engine rooms,
• lines with JIS 10K flanges.

Selection Criteria

Gate valves are selected for line isolation with low pressure drop when fully open. Not suitable for throttling, as partial disc positions can cause seat wear, vibration, and unstable flow.

Maintenance

Inspection includes seat condition, stem packing, bonnet tightness, flange corrosion, and handwheel operation. In seawater service, check compatibility between cast steel body, bronze or stainless seats, and piping materials.

FAQ

Is it 5K or 10K?
Product page specifies JIS 10K and test pressures 2.1 / 1.54 MPa.

Is it suitable for flow regulation?
No. This is an isolation valve.

When is cast steel body selected?
When higher mechanical strength than cast iron is required and compatibility with JIS flanged piping is necessary.