Butterfly valve with purging high-temperature lining

Abstract

The utility model relates to a butterfly valve with a purging high-temperature lining, which belongs to the technical field of valves and comprises a valve body, a valve seat, a butterfly plate, a valve rod, a valve body shaft hole and a sealing filler device arranged between the valve body shaft hole and the valve rod. Valve rod through holes in the two radial ends of the O-shaped graphite sealing sleeve are in rotary sealing fit with the outer circle face of the valve rod, and a glue pouring liquid lining is poured into the inner wall of the valve body channel. The two ends, close to the sealing face of the valve seat, of the valve body channel are provided with purging channels in the radial direction, the ends, located outside the valve body, of the purging channels are connected with a purging valve, and the valve seat has the advantages of double sealing, high abrasion resistance and convenience in cleaning and purging of the valve seat.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the valve field, especially relate to a butterfly valve with blowing high temperature lining. BACKGROUND

[0002] The butterfly valve is mainly composed of a valve body, a butterfly plate, a valve rod and a valve seat, and the flow of medium is controlled by rotating the butterfly plate driven by the valve rod. The seal between the transmission butterfly valve rod and the valve body is generally achieved by setting a packing box between the valve rod and the valve body shaft hole, and filling the packing inside. The packing is tightly attached to the surface of the valve rod to form a seal by the pressure applied by the packing gland. The disadvantage is that the valve body cavity relies on a single sealing structure, and the aging packing needs to be replaced regularly. Moreover, under long-term operation, the valve seat end face protruding from the valve body channel is prone to accumulate impurities, which in turn causes wear on the sealing surface of the butterfly plate and the valve seat, affecting the sealing performance of the butterfly valve. SUMMARY

[0003] The utility model discloses in view of the shortcomings of prior art, develop a kind of with double sealing structure's butterfly valve with valve seat blowing function with blowing high temperature lining butterfly valve.

[0004] The technical scheme of the utility model is as follows:

[0005] A butterfly valve with blowing high temperature lining, comprising a valve body, a valve seat, a butterfly plate, a valve rod and a transmission mechanism, the butterfly plate is fixedly installed on the valve rod by a pin shaft and is placed in the valve body channel, the sealing surface of the butterfly plate and the sealing surface of the valve seat cooperate to form a conical sealing pair, and the valve seat is fixedly arranged on the radial inner step in the valve body channel. The valve body is provided with a valve body shaft hole through which the valve rod passes, and a sealing packing device is arranged between the valve body shaft hole and the valve rod, which comprises a packing box, sealing packing and a packing gland. The sealing packing is tightly pressed in the packing box by the packing gland. The valve body channel is provided with a radial annular groove, an O-shaped graphite sealing sleeve is sealingly clamped in the radial annular groove, the two ends of the O-shaped graphite sealing sleeve are provided with valve rod through holes through which the valve rod passes, the outer cylindrical surface of the valve rod and the valve rod through hole are rotationally sealed, and the inner wall of the valve body channel is cast and grouted with a glue liquid lining, which tightly fixes the O-shaped graphite sealing sleeve in the radial annular groove of the valve body. A blowing channel is formed at the two ends of the valve body channel close to the sealing surface of the valve seat, and one end of the blowing channel outside the valve body is connected to a blowing valve.

[0006] In the above technical scheme, the O-shaped graphite sealing sleeve and the radial annular groove are in interference fit.

[0007] In the above technical scheme, a one-way valve is fixedly arranged in the blowing channel.

[0008] The advantages of this utility model compared with the prior art are as follows: an O-ring graphite sealing sleeve is installed in the radial annular groove of the valve body channel and pressed and fixed by the glue lining. The O-ring graphite sealing sleeve and the outer circle of the valve stem rotate and seal, ensuring the sealing of the valve body cavity. It forms a double sealing structure with the sealing packing device of the valve body shaft hole. A purge channel is opened in the valve body, and the valve seat is cleaned and purged regularly by the purge valve to prevent the accumulation of media impurities and ensure the sealing fit between the valve seat and the butterfly plate. Attached Figure Description

[0009] Figure 1 This is a structural cross-sectional view of the present invention.

[0010] Figure 2 This is a schematic diagram of the purging channel of this utility model.

[0011] In the diagram: 1 Valve body, 2 O-ring graphite sealing sleeve, 3 potting liquid lining, 4 radial annular groove, 5 valve stem, 6 sealing packing, 7 purge valve, 8 purge channel, 9 valve body channel. Detailed Implementation

[0012] like Figure 1 , Figure 2 The illustrated high-temperature lined butterfly valve with purging includes a valve body 1, a valve seat, a butterfly plate, a valve stem 5, and a transmission mechanism. The butterfly plate is fixedly mounted on the valve stem 5 by a pin and placed within a valve body channel 9. The sealing surface of the butterfly plate and the sealing surface of the valve seat cooperate to form a conical sealing pair. The valve seat is fixedly mounted on a radial inner step within the valve body channel 9. The valve body 1 has a valve body shaft hole through which the valve stem 5 passes. A sealing packing device is provided between the valve body shaft hole and the valve stem 5, including a stuffing box, a sealing packing 6, and a packing gland. The sealing packing 6 is pressed into the stuffing box by the packing gland, and the packing gland is fixedly connected to the upper end face of the valve body 1 by bolts. The valve body channel 9 is characterized by a radial annular groove 4, within which an O-ring graphite sealing sleeve 2 is sealed and fitted. The O-ring graphite sealing sleeve 2 has valve stem through holes at both radial ends for the valve stem 5 to pass through. The outer surface of the valve stem 5 and the valve stem... The through-hole rotation seal provides the first sealing guarantee for the valve body cavity, forming a double sealing structure with the packing seal device of the valve body shaft hole, improving the sealing performance of the valve body and extending the service life of the sealing packing 6; the inner wall of the valve body channel 9 is filled with a potting liquid lining 3, which presses and fixes the O-type graphite sealing sleeve 2 in the radial annular groove 4 of the valve body 1. The potting liquid lining 3 improves the wear resistance of the inner wall of the valve body 1 and plays a role in preventing displacement of the O-type graphite sealing sleeve 2, preventing the O-type graphite sealing sleeve 2 from being displaced by the impact of the medium in the valve body channel 9; the valve body channel 9 has radially opened purge channels 8 at both ends near the valve seat sealing surface. The purge channels 8 penetrate the valve body 1, and the end located outside the valve body 1 is connected to the purge valve 9. By operating the purge valve 9, the valve seat can be periodically purged and cleaned through the purge channels 8 to prevent the accumulation and sedimentation of medium impurities.

[0013] The O-ring graphite seal sleeve 2 and the radial ring groove 4 are in interference fit, which increases the stability of the O-ring graphite seal sleeve 2 in the valve body 1.

[0014] A one-way valve is fixedly arranged in the purge channel 8 to prevent the medium from flowing into the purge valve 9 through the purge channel 8 and leaking to the outside of the valve body 1.

Claims

1. A high-temperature lining butterfly valve with purging, comprising a valve body (1), a valve seat, a butterfly plate, a valve stem (5), and a transmission mechanism, wherein the butterfly plate is fixedly mounted on the valve stem (5) by a pin and placed in the valve body channel (9), the sealing surface of the butterfly plate and the sealing surface of the valve seat cooperate to form a conical sealing pair, and the valve seat is fixedly set on the radial inner step in the valve body channel (9); the valve body (1) is provided with a valve body shaft hole for the valve stem (5) to pass through, and a sealing packing device is provided between the valve body shaft hole and the valve stem (5), including a stuffing box, a sealing packing (6) and a packing gland, wherein the sealing packing (6) is pressed into the stuffing box by the packing gland, characterized in that: The valve body channel (9) is provided with a radial ring groove (4), and the radial ring groove (4) is provided with an O-shaped graphite sealing sleeve (2) which is tightly clamped. The O-shaped graphite sealing sleeve (2) is provided with a valve rod through hole at the two radial ends, the valve rod (5) is in rotating sealing cooperation with the valve rod through hole, the inner wall of the valve body channel (9) is provided with a glue liquid lining (3), the glue liquid lining (3) tightly fixes the O-shaped graphite sealing sleeve (2) in the radial ring groove (4) of the valve body (1), and the two ends of the valve body channel (9) close to the valve seat sealing surface are provided with a blowing channel (8), and the blowing channel (8) is connected with a blowing valve (7) at one end of the valve body (1).

2. A butterfly valve with a purging high temperature lining as claimed in claim 1, characterized in that: The O-shaped graphite sealing sleeve (2) and the radial ring groove (4) are in interference fit.

3. A butterfly valve with a purging high temperature lining according to claim 1 or 2, characterized in that: A one-way valve is fixedly arranged in the blowing channel (8).

Images