the relief valve is open-close part under the action of external force in a normally closed state, when the equipment or piping within the medium pressure than specified value, through a discharge medium system to prevent the pipeline or equipment within the medium pressure in excess of the prescribed special valves. Relief valve belong to automatic valve class, mainly for the LNG vessels and piping, control pressure shall not exceed the specified value, to protect personal safety and equipment operation plays an important role. When the equipment or pipeline internal pressure or temperature exceeds the relief valve set pressure, automatic open pressure or temperature, ensure that the equipment and piping within the medium pressure ( Temperature) In the set pressure ( Temperature) Under, the normal work of the protection equipment and pipe, prevent accidents and reduce losses. The relief valve is mainly used in LNG liquefaction systems, LNG storage tanks, LNG tanker. Relief Industrial Valves is generally in the form of the structure of spring type safety valve, relief valve lever, the impulse safety valve, the most common spring safety valve application. Relief valve according to the connection mode can be divided into the thread safety valve and flange valve. Safety valve size is generally small, the commonly used between DN 15 ~ 80 mm, more than 150 mm is generally referred to as the large diameter valve. LNG valve as shown in figure 1 13. Figure 1

- 13 LNG valve

check valve flow refers to rely on the media itself, and automatic opening and closing valve, used to prevent reversal LNG valve, also known as the non-return valve, check valve, flow valve and the back pressure Industrial Valves, etc. Check valve belongs to a kind of automatic Industrial Valves, its main role is to prevent the reverse LNG, prevent the pump and drive motor reversal, and the discharge of the LNG container. Check valve can also be used to give the pressure could rise to more than the system pressure of the auxiliary system supply piping. Check the main can be divided into swing check valve ( In accordance with the center of gravity rotating) And lift check valve ( Move along the axis) 。 Check valves are only allowed to medium flows in one direction, the direction and stop the flow. Swing check valve in the fully open conditions, almost unimpeded fluid pressure, so the pressure drop across the valve is relatively small. Lift check valve disc is located in the body seat sealing surface. In addition to this check valve can be freely valve movements, like the rest of the cut-off valve, fluid pressure from the valve seat sealing surface lift, medium return led to the disc back to seat, and cut off the flow.

LNG check the floor plan as shown in figure 1 14.

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