Marine Check Valve
Marine check valves are circular discs with opening and closing parts that prevent medium backflow by their own weight and medium pressure action. There are two types of disc movements: lifting and swinging. Unlike globe valves, lift check valves do not have a stem to drive the disc. Flow of the medium occurs from the inlet end (lower side) to the outlet end (upper side). When the inlet pressure exceeds the sum of the disc weight and the flow resistance, the valve opens. In the event that the medium flows backwards, the valve is closed. As with lift check valves, swing check valves have an oblique disc that rotates around the shaft.
Marine Check Valve Type And Working Principle
Gravity check valves with flanges are the most commonly used type. When the working medium with a certain pressure enters the inlet valve cavity of the check valve, the force of the working medium acts on the underside of the valve disc to overcome gravity, causing the valve disc to rise along the guide groove on the cover and leave the valve. At this point, the channel of the check valve is opened;
By gravity, the valve disc falls back to the valve seat when the working medium returns to the inlet chamber of the check valve. During this time, the returning working medium acts on the valve disc. By pressing the disc tightly against the valve seat, the check valve closes, preventing backflow.
Swing arm check valves are also available in addition to gravity check valves. It is also called the anti-wave valve. An anti-wave valve consists of a valve body, a valve disc, and a rotating shaft. The working medium is contained in the valve cavity, which is an advantage. Gravity check valves have a lower flow resistance.
There is also a flange type and thread type connection between the check valve and pipeline. Cast iron, cast steel, and bronze are the metal materials used to make check valves (mainly the valve body).
Features of Marine Check Valve
A marine check valve should be provided when reverse flow of fluid is not allowed in the pipeline. Check valves do not have stems. As the pressure on one side of the valve increases, the valve can be pressed against the seat; as the fluid acts on the other side, the valve can be opened. A lift type check valve and a swing type check valve are the two most common types of check valves.
Diameter | DN40-DN600 |
Medium | Water, Oil, Gas, Acid and Alkali Corrosion Liquid |
Material | Carbon Steel, Ductile Iron, Bronze, Stainless Steel |
Pressure | PN1.6-16.0MPa |
Temperature | -29℃-550℃ |
Connection | Thread, Flange, Welding, Butt Welding |
Power | Manual, Pneumatic, Hydraulic, Electric |
The Advantages of Our Marine Check Valve
- Ensure the valve’s service life by casting blanks with high precision, small deformations, good appearance, as well as dense internal quality and good metallography structure. Reduce porosity, shrinkage, cracks, and other defects.
- To ensure that the valve sealing face is processed accurately with Angle finish and matching sealing pair requirements, advanced production equipment is used.
- The assembly equipment is of the highest quality and the personnel are highly qualified. All Gosea Marine products are tested for performance and quality of pressure sealing before they leave the factory.
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