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Improve the Accuracy of Flow Regulation of Marine Valves

Marine valves are mainly used in LNG liquefaction systems, LNG storage tanks, LNG tankers and other systems. Marine valves are generally divided into spring-type marine valves, lever-type marine valves, and pulse-type marine valves according to their structural forms, among which spring-type marine valves are more commonly used. Marine valves can be divided into threaded marine valves and flanged marine valves according to the connection method.


Marine valve refers to the valve that automatically opens and closes the valve flap by relying on the flow of the medium itself to prevent backflow, also known as check valve, one-way valve, reverse flow valve and back pressure valve. The marine valve is an automatic valve, and its main function is to prevent backflow, prevent the reverse rotation of the pump and the driving motor, and the discharge of the container. Marine valves can also be used on lines supplying auxiliary systems where the pressure may rise above the system pressure.


1. The advantages of marine valves with refractory structure


Marine valves have a fire-resistant construction that, in the event of a fire, still operates reliably and provides excellent sealing. According to user needs, it can be equipped with anti-static structure. The marine valve is equipped with a 90° switch with a hole positioning piece, which can be locked according to requirements to avoid misoperation. The application of the wafer type ultra-thin stainless steel marine valve: the wafer type stainless steel marine valve is suitable for Class150, PN1.0 ~ 2.5MPa, and the working temperature is 29 to 180 °C (the sealing ring is reinforced PTFE) or 29 to 300 °C On various pipelines (the sealing ring is para-polyphenylene), it is used to cut off or connect the medium in the pipeline. The marine valves use different raw materials, especially suitable for water, steam, oil, nitric acid, acetic acid, oxidation Sex media, urea and other media.


2. Improve the flow regulation accuracy of marine valves


Most of the opening and closing parts of marine valves are conical streamlined, which can change the cross-sectional area of the passage to achieve the throttling refrigeration effect. The flow rate of the medium between the throttle disc and the valve seat is so high that the surface of these parts is quickly damaged - the so-called cavitation phenomenon. In order to minimize the impact of cavitation on marine valve products, the valve disc is made of cavitation-resistant material (made of alloy steel) and made into a streamlined cone with a tip angle of 140° to 180°, which also enables marine valve disc to have Larger opening heights are generally not recommended for throttling under small gaps. The throttle valve can be divided into two types: straight-through type and angle type according to the channel mode; according to the shape of the opening and closing parts, there are three types: needle-shaped, groove-shaped and window-shaped. The valve needle and valve core of the adjustable marine valve are made of cemented carbide. The products can be designed according to the standard and have wear resistance and erosion resistance. The spool of the sliding sleeve throttle valve adopts a low-noise balanced structure, which is easy to open. The surface of the spool is covered with tungsten carbide. It is suitable for occasions with harsh conditions such as flash evaporation, high pressure difference, high pressure and cavitation. It has a long service life and a flow rate. The adjustment accuracy is greatly improved.

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