High-temperature high-pressure safety valve with combined adjustable elastic seal disc

Abstract

A high-temperature high-pressure safety valve with a combined adjustable elastic seal disc comprises a valve body, a valve seat, radiating fins, a valve stem, a bonnet and a hood; the valve body is connected at the top with the lower end of the bonnet through the radiating fins, the bonnet is arranged at the upper end of the hood, the lower end of the valve stem is provided with a combined adjustable disc component that is in crimped hermetic fit with the upper end of the valve seat, the upper portion of the valve stem is provided with a spring compressed anti-loosing anti-torsion structure positioned in the hood, a guide sleeve is arranged in the valve body, the lower portion of the guide sleeve is sleeved with an upper adjusting ring, and the upper portion of the valve seat is sleeved with a lower adjusting ring; the side of the valve body is provided with an upper gear adjusting mechanism for adjusting the upper adjusting ring in vertical motion and a lower gear adjusting mechanism for driving the lower adjusting ring in vertical motion. The action to adjust the safety valve from outside of the valve body is safe, reliable and accurate; the combined adjustable disc component is easy to process and high in assembly precision and provides improved valve sealing reliability and backflushing effect; spring torsion possibly occurring in compression or resilience of the spring is eliminated.

Description

technical field [0001] The invention belongs to the technical field of valves, and in particular relates to a combined adjustable elastic sealing disc high-temperature and high-pressure safety valve with an anti-loosening and anti-rotation structure and a gear rotation adjustment ring. Background technique [0002] The adjustment of the adjustment ring of the spring direct load safety valve is an important step for the action performance of the safety valve to reach the standard required value. The action performance of the safety valve includes multiple parameters such as valve opening pressure, discharge pressure, opening height, reseating pressure, and sealing pressure. The value of each parameter must be within the range specified by the standard to qualify the valve. These dynamic parameter values ​​must be manually adjusted to the position of the valve adjustment ring to make it meet the standard requirements, that is to say, the action performance of the safety valve ...

AI Technical Summary

Problems solved by technology

[0007] In the existing spring direct load type safety valve, when the pressure is set, the adjusting screw is directly screwed to compress the spring. The lower end of the adjusting screw contacts the upper end surface of the upper spring seat. The force is also large, which drives the upper spring seat to rotate, and the lower spring seat directly sits on the end surface of the valve stem boss, and the friction force is also very large. The lower end will not rotate with the upper end, and the spring is longer. When the adjusting screw is tightened and turned, the spring will be twisted and deviated from the center line or skewed, the force of the lower spring seat acting on the valve stem will inevitably change the direction of action, and the sealing force of the valve stem acting on the valve disc will also deviate from the center, forming a valve. The sealing surface of the flap and the sealing surface of the valve seat are not evenly matched, resulting in a decrease in the sealing effect, or even a failure of the seal, especially in high temperature and high pressure conditions.

[0008] After the existing spring direct load type safety valve is set to the pressure, the adjusting screw is usually back-tightened with a hexagonal nut to prevent loosening. If it is loosened, the adjusting screw will also loosen accordingly, and the set pressure will decrease, that is, the valve will be opened in advance to discharge, which wastes resources. This phenomenon is more obvious in high temperature and high pressure conditions, and users have more feedback

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