Cast Steel Marine Self-closing Valve
Cast Steel Marine Self-closing Valve is a heavy-duty automatic closing valve designed for marine piping systems requiring high mechanical strength, pressure resistance, and reliable shut-off performance.
Manufactured with cast steel valve bodies, this type of self-closing valve provides excellent durability and is suitable for demanding marine applications where bronze valves may not meet strength requirements.
The valve incorporates a spring-loaded or weight-assisted closing mechanism that automatically returns the valve to the closed position after operation, preventing unintended fluid discharge.
Cast Steel Marine Self-closing Valve is commonly installed in:
Fuel oil systems
Lubricating oil systems
Hydraulic systems
Engine room piping
Marine machinery systems
High-pressure fluid pipelines
Overview
Working Principle of Cast Steel Marine Self-closing Valve
Cast Steel Marine Self-closing Valve operates through an automatic return mechanism.
When the valve is opened manually:
The operating handle moves the valve stem.
The disc separates from the valve seat.
The medium flows through the valve passage.
When the operating force is released, the spring mechanism activates.
The disc automatically returns to the closed position.
The valve stops fluid flow and prevents leakage.
Technical Specifications of Cast Steel Marine Self-closing Valve
Salt spray resistance: After being subjected to a neutral salt spray test (in accordance with GB/T 10125-2021) for 48 hours, the component shall show no obvious corrosion or coating peeling, and its sealing performance shall still meet the requirements of C this standard.
Vibration resistance: The component shall be capable of withstanding vibrations encountered during ship navigation. After being subjected to vibration at a frequency of 10 to 100 Hz with an amplitude of 0.1 to 0.5 mm for 2 hours, there shall be no loosening, deformation, or leakage, and all performance parameters shall remain normal.
Temperature resistance: The component shall operate normally at ambient temperatures ranging from –20 °C to 60 °C, without brittle cracking, deformation, or sealing failure.
Pressure Test of Cast Steel Marine Self-closing Valve
After the connecting parts of the component and the sounding valve are closed, they shall be subjected to a hydrostatic pressure of 1.5 times the nominal pressure (but not less than 0.3 MPa) for 30 minutes. During this period, there shall be no leakage, no visible deformation, and no abnormal noise.
At the connection between the sounding head and the sounding instrument, under normal working pressure, there shall be no leakage of the medium, and the sealing elements shall show no deformation or damage.
