A forged steel bonnetless globe valve

Abstract

The invention belongs to forged steel bonnet-free stop valves and particularly relates to a forged steel bonnet-free stop valve which is applicable to various harsh working conditions, simple in structure, reliable and durable. The forged steel bonnet-free stop valve comprises a valve body, a valve rod assembly is arranged in the cavity of the valve body, the head portion of the valve rod assembly is provided with a valve flap, a seal seat, a pressure ring and filler are further sequentially arranged on the valve rod assembly, the valve body is provided with a support in which a filler pressing sleeve assembly is arranged, the end portion of the support is connected with a valve rod nut, the valve rod assembly sequentially penetrates the support, the filler pressing sleeve assembly and the valve rod nut, and the end portion of the valve rod assembly is provided with a hand wheel. The forged steel bonnet-free stop valve has the advantages that the forged steel bonnet-free stop valve is of a bonnet-free structure and the bonnet connected with the valve body is omitted, so that seal leakage problem caused by bonnet connection is solved fundamentally, and the safe reliability of the valve is improved remarkably. According to the forged steel bonnet-free stop valve, a secondary throttle structure is utilized to cope with erosion of high temperature and high pressure mediums to the sealing surface of the seal body and the valve flap. The forged steel bonnet-free stop valve meanwhile solves the problem of lack of upper seal due to lack of the bonnet.

Description

technical field [0001] The invention belongs to a forged steel non-bonnet stop valve, in particular to a forged steel non-bonnet stop valve with a simple structure, reliability and durability, which is suitable for various severe working conditions. Background technique [0002] At present, forged steel bonnetless globe valves all have a bonnet structure, and the following three structures are commonly used: [0003] 1. Bolted valve cover structure, the valve body and the valve cover are connected by bolts, and the valve structure is huge; [0004] 2. Pressure self-tightening sealing bonnet structure, the bonnet of this structure is self-tightening and sealing by the pressure in the middle cavity of the valve body, the valve structure is complex and the processing requirements are high; [0005] 3. Threaded connection plus sealing welding structure, the valve cover of this structure is connected with the valve body by threads, and the sealing mainly depends on welding, so t...

AI Technical Summary

Problems solved by technology

[0005] 3. Threaded connection plus sealing welding structure, the valve cover of this structure is connected with the valve body by threads, and the sealing mainly depends on welding, so the safety is poor

[0006] The above structure not only has the above disadvantages, but also has the problem of sealing leakage between the valve body and the valve cover.

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