Conical surface soft sealing structure for safety valve

Abstract

The invention provides a conical surface soft sealing structure for a safety valve. The conical surface soft sealing structure comprises a boss-shaped valve seat. The top end of the valve seat is embedded into the bottom of a groove-shaped recoil disc. The top end of the valve seat is connected with the bottom of the recoil disc through a lower adjusting ring in a threaded mode. A groove in the recoil disc is filled with a T-shaped sealing block. The lower end of the T-shaped sealing block stretches into the top end of the valve seat. A guide rod is arranged above the recoil disc. The guide rod is connected into the recoil disc in a threaded mode. The guide rod and the recoil disc are fixed to prevent loosening through a locking nut. The guide rod presses the sealing block embedded in the recoil disc. Meanwhile, the recoil disc has the function of a pressing block. The sealing block, the recoil disc, the guide rod and the locking nut form an integrally-moving assembly. A conical surface sealing mode is adopted for the sealing face where the valve seat makes contact with the sealing block. By means of the conical surface soft sealing structure for the safety valve, it is guaranteed that the valve is opened precisely, sealed reliably, discharged stably and capable of returning back to the valve seat at the right moment at the normal temperature ranging from -46 DEG C to 200 DEG C and at the low temperature ranging from -46 DEG C to -200 DEG C.

Description

technical field [0001] The invention relates to a safety valve, in particular to a soft sealing structure of a conical surface for a spring direct load type safety valve, which can be applied to normal temperature working conditions (-46°C to 200°C) and low temperature working conditions (-46°C to - 200°C). Background technique [0002] The safety valve is an automatic valve that uses the force of the medium itself to discharge a certain quality of fluid without any external force to prevent the pressure from exceeding the rated safety value. When the pressure returns to normal, the valve closes again and prevents the medium from continuing to flow out. Cryogenic safety valves are widely used in air separation, LNG, LPG, polysilicon and other industries, and are an important product branch in the field of safety valves, with broad market demand. In related chemical fields, especially cryogenic equipment and oxygen medium equipment in the field of air separation, due to ver...

AI Technical Summary

Problems solved by technology

In this sealing structure, the valve seat 1 adopts a boss design, and the flat sealing block 4 in contact with it is fixed on the recoil disc 3 with a pressure block 5 and a compression screw 6, which can be disassembled and replaced, but due to the flat sealing The boss of the middle valve seat 1 is a circular arc surface, and the contact pair between the boss and the sealing block 4 is a line contact at first. After the valve takes off several times, the sealing block 4 will inevitably undergo plastic deformation, leaving groove-shaped indentations

The recoil disk 3 of the fixed sealing block 4 cannot guarantee that it will fall on the same position after each take-off in the guiding process, so it will occur that the flat sealing structure is better when the sealing effect is just beginning. 4 After take-off, it cannot be guaranteed to fall on the same position of the valve seat 1, resulting in the continuous widening and deepening of the groove indentation of the sealing block 4, the sealing performance will be reduced, and the service life of the sealing block 4 will also be reduced accordingly

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