Improved sealing structure of safety valve

Abstract

An improved sealing structure for a safety valve, primarily used in boilers, pressure vessels, or pipeline systems, involves incorporating a leak-proof disc with an air chamber within the valve body, along with a valve disc with a groove. This design confines the leak-proof disc within a physical boundary formed by the valve body and the valve disc. The elasticity of the air chamber reduces pressure on the stressed surface. Through "metal limiting" and "soft-hard composite sealing" technologies, the design thoroughly solves the safety issues associated with traditional PTFE sealing materials, such as cold flow, displacement caused by high-frequency reciprocating motion, and sparking during metal-to-metal sealing. This achieves a bubble-tight zero-leakage effect and effectively extends the valve's service life.

Claims

1. An improved sealing structure for a safety valve, applied to a pressure relief system of a pressure vessel or pipeline, comprising: A valve disc has a fully enclosed groove with its opening facing a valve seat, and the bottom surface of the groove has a plurality of micro-grooves; a sealing gasket is disposed in the groove, the sealing gasket is made of polytetrafluoroethylene (PTFE), and the sealing gasket has an internal air chamber structure; and a valve seat is disposed opposite to the valve disc, the valve seat having a narrow contact end for contacting the sealing gasket to form a sealing line; wherein, when the sealing gasket is compressed by the valve disc, some material fills the micro-grooves on the bottom surface of the groove to form a mechanical interlock, and the deformation of the sealing gasket is restricted within the physical boundary of the groove to suppress cold flow and achieve zero-leakage sealing.

2. An improvement to the sealing structure of the safety valve as described in claim 1, wherein, The micro-grooves on the bottom surface of the slot are machined with concentric serrated finishes to provide a labyrinth seal and reduce fluid leakage.

3. An improvement to the sealing structure of the safety valve as described in claim 1, wherein, The sealing gasket is made of modified PTFE material, which has an improved deformation recovery rate to cope with impact and frictional heat in high-frequency reciprocating motion environments.

4. An improvement to the sealing structure of the safety valve as described in claim 1, wherein, The narrow contact end of the valve seat is provided with an R-angle blunting structure to avoid shear damage to the sealing gasket at the moment the valve disc opens.

5. An improvement to the sealing structure of the safety valve as described in claim 1, wherein, The valve disc has auxiliary teeth at the edge of the slot to increase the sealing pressure per unit area by reducing the contact area.

6. An improvement to the sealing structure of the safety valve as described in claim 1, wherein, The gasket's air chamber structure maintains a predetermined gap with the bottom surface of the groove, reducing direct pressure on the stressed surface through an elastic compensation mechanism to prevent the gasket from collapsing.

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