Swing Check Valves

Marine flapper check valves are used to provide passive backflow prevention in shipboard piping systems, including seawater, freshwater, bilge, ballast, cooling circuits, and auxiliary pump lines. The flap disc opens under the dynamic pressure of forward flow and closes when flow decreases or reverses, limiting return flow toward pumps, tanks, and heat exchangers.

This category includes JIS flanged check valves in straight-pattern and angle-pattern configurations, with bronze and cast iron bodies. Available types include F7371, F7372, F7373, F7356, F7358, and union bonnet designs F7415, F7416, F7417, and F7418, depending on pressure class and construction. Pressure ratings include 5K, 10K, and 16K according to the applicable JIS series.

Bronze constructions typically use BC6 for body, bonnet, and disc in smaller nominal sizes. As an example, type F7371 is manufactured to JIS F7371-1996, with testing in accordance with JIS F7400-1996. For the 5K version, the referenced hydraulic shell test pressure is 1.05 MPa, with seat leakage testing in the range of 0.77 to 0.4 MPa.

Cast iron versions are used for larger nominal diameters in general marine service. Type F7373, to JIS F7373-1996, is specified with FC200 body and bonnet, and BC6 disc and seat. Referenced test pressures are 2.1 MPa for shell integrity and 1.54 to 0.4 MPa for seat leakage verification.

Union bonnet designs allow easier access to the internals for inspection of the disc, seat, and gasket during maintenance. In 16K executions such as F7417 and F7418, referenced test pressures reach 3.3 MPa for shell testing and 2.42 to 0.4 MPa for seat testing.

Valve selection should consider flow direction, installation orientation, minimum differential pressure required for disc opening, line velocity, susceptibility to water hammer, material compatibility with the service fluid, and maintenance access. For marine duty, engineers should also review flange standard, corrosion exposure, allowable leakage level, and suitability for intermittent or pulsating pump operation.

Swing check valve Bronze 5K - F7371 | Philippopoulos s.a.

Swing check valve Bronze 5K - F7371

Swing check valve Bronze 5K - F7371
Bronze Swing Check Valve, JIS 5K F7371 Flanged straight-flow swing check valve for marine piping systems, designed to JIS F7371-1996 and tested per JIS F7400-1996. Operation is mechanical, actuated by line differential pressure without external actuator. Technical Data Type: Swing check (clapper) Connection: Flanged Pressure class: JIS 5K Body, cover,...
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Swing check valve Cast iron 5K - F7372 | Philippopoulos s.a.

Swing check valve Cast iron 5K - F7372

Swing check valve Cast iron 5K - F7372
Cast Iron Swing Check Valve JIS 5K F7372 Flanged swing check valve designed for marine and industrial water systems where prevention of reverse flow is required without external actuation. Construction and dimensions comply with JIS F7372-1996; pressure testing per JIS F7400-1996. Construction and Test Pressure Pressure class: JIS 5K Connection: flanged...
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Swing check valve Cast iron 10K - F7373 | Philippopoulos s.a.

Swing check valve Cast iron 10K - F7373

Swing check valve Cast iron 10K - F7373
Cast Iron Swing Check Valve JIS 10K F7373 Flanged swing check valve, straight-through flow pattern, designed for marine piping systems and auxiliary industrial water installations. Operation is based on line differential pressure, with no actuator or external manual intervention required. Standards and Test Pressure This series is manufactured in...
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Swing check valve Bronze 5K - F7356 | Philippopoulos s.a.

Swing check valve Bronze 5K - F7356

Swing check valve Bronze 5K - F7356
Bronze Lift Check Valve JIS 5K F7356 Flanged lift check valve designed for auxiliary marine piping systems with small nominal diameters. The valve operates via line differential pressure: the disc lifts under normal flow and reseats when flow decreases or reverse pressure occurs. Standards and Testing Manufactured in accordance with JIS F7356-1996....
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Swing check valve Cast iron 5K - F7358 | Philippopoulos s.a.

Swing check valve Cast iron 5K - F7358

Swing check valve Cast iron 5K - F7358
Cast Iron Lift Check Valve JIS 5K F7358 Flanged lift check valve (globe pattern) designed for marine water systems and auxiliary low-pressure lines. Although sometimes referenced as a swing type, technical documentation specifies this as a Cast Iron 5K Lift Check Globe Valve. Operation is automatic, actuated by differential line pressure, with no actuator...
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Swing check valve Bronze 5K - F7415 (Union Bonnet Type) | Philippopoulos s.a.

Swing check valve Bronze 5K - F7415 (Union Bonnet Type)

Swing check valve Bronze 5K - F7415 (Union Bonnet Type)
Bronze Lift Check Valve JIS 5K F7415 Lift check globe valve with union bonnet, designed for small-diameter marine auxiliary piping. Although often categorized commercially as swing check, the technical specification defines this product as Bronze 5K Lift Check Globe Valve – Union Bonnet Type. Standards and Testing Design standard: JIS F7415-1996 Test...
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Swing check valve Angle Bronze 5K - F7416 (Union Bonnet Type) | Philippopoulos s.a.

Swing check valve Angle Bronze 5K - F7416 (Union Bonnet Type)

Swing check valve Angle Bronze 5K - F7416 (Union Bonnet Type)
Bronze Angle Lift Check Valve JIS 5K F7416 The angle lift check valve with union bonnet is designed for auxiliary marine piping systems of small diameters. Technical specifications reference standard JIS F7416-1996 and hydrostatic testing per JIS F7400-1996. Construction Connection class: JIS 5K flanged Body: BC6 bronze Bonnet: BC6 bronze (union type)...
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Swing check valve Bronze 16K - F7417 (Union Bonnet Type) | Philippopoulos s.a.

Swing check valve Bronze 16K - F7417 (Union Bonnet Type)

Swing check valve Bronze 16K - F7417 (Union Bonnet Type)
Bronze Lift Check Valve JIS 16K F7417 Lift check globe valve with union bonnet, designed for small-diameter marine pipelines where reverse flow prevention is required in JIS 16K class systems. Operation is automatic, actuated by differential line pressure; no external actuator is required. Suitable for clean media to ensure reliable seating and minimize...
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Swing check valve Angle Bronze 16K - F7418 (Union Bonnet Type) | Philippopoulos s.a.

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

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 –...
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