High-temperature abrasive resistant ball valve with fixed ball and floating valve seat

Abstract

The invention discloses a high-temperature abrasive resistant ball valve with a fixed ball and a floating valve seat. The ball valve has a left valve body (1) and a right valve body (7) which form a stuffing box with the floating valve seat (2) respectively. The stuffing box is filled with stuffing (4) and a high-temperature resistant spring (3) is arranged between stuffing (4) so as to form stuffing seal (12). The two floating valve seat (2) is caused to reach floating and sealing requirements in the left valve body (1) or the right valve body (7) in virtue of recurrent force of the embedded high-temperature resistant stuffing (4), the high-temperature resistant spring (3) and the auxiliary seal spring (13). In respect of material selection, the ball valve is made of a high-temperature material. The ball valve is made from a new material and by a new process and has a spray welding sealing surface made of a nickel-based alloy and a chrome-based alloy, thus improving hardness of the sealing surface (up to HRC68-72) and reaching remarkable effect of abrasive resistance, corrosion resistance and erosion resistance.

Description

technical field [0001] The invention relates to a valve device, in particular to a high-temperature, high-pressure wear-resistant ball valve used for gas-solid two-phase or gas-solid-liquid three-phase media. Background technique [0002] High temperature wear-resistant fixed ball floating seat ball valve is a kind of ball valve widely used in the prior art. Chinese patents CN2867000Y, CN1225432A, Japanese patent JP2002-257246A and U.S. patent US4911408A etc. all disclose some structures of this ball valve. At the same time, some domestic units have developed some high-temperature resistant fixed ball valve products, but most of their products use three-body combination valve bodies, as shown in Figure 1 and Figure 2: [0003] This three-body combined valve body is that the sphere (3) is fixed on the middle valve body (6) with the upper and lower shafts (4, 7), and the valve seat (2) is contained in the left and right valve bodies (1, 5). The three-body combination is conn...

AI Technical Summary

Problems solved by technology

Since the left and right valve bodies (1, 5) are in direct contact with the valve seat (2), the movement depends on the gap tolerance and the degree of freedom of the valve seat

[0006] 2. Due to structural limitations, the seat of ordinary fixed ball valves is mostly sealed with O-rings (8), so the operating temperature is limited (as shown in Figure 1 and Figure 2)

[0007] 3. The surface hardness of the spherical surface and the sealing pair of the valve seat is not high or the hardness difference is large

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