Corrosion-resistant full-lining ceramic ball valve

Abstract

The utility model relates to a corrosion-resistant full-lining ceramic ball valve which comprises a three-section type combined structure composed of a valve body and two symmetrically-arranged valve covers. The ceramic middle body is arranged in the central cavity of the valve body, and the outer diameter of the ceramic middle body is in transition fit with the inner diameter of the valve body; the ceramic ball is arranged in an inner cavity of the ceramic middle body and is connected with the driving actuator through a valve rod; the two ceramic valve seats are symmetrically arranged, and the two ceramic valve seats are matched with the ceramic ball for grinding; the ceramic connecting pipe is arranged in the valve cover; the valve rod is sleeved with a PTFE shaft sleeve, and the PTFE shaft sleeve and the ceramic middle body form static pressure sealing through pressing of the valve rod and the packing assembly. The filler assembly comprises filler, a filler pressing sleeve and a pressing plate which are arranged in sequence, the filler pressing sleeve and the pressing plate press the filler downwards, and adjustable filler extrusion sealing is formed through a pressing plate bolt and a pressing plate nut; a multi-stage sealing assembly is further included. The corrosion resistance, the abrasion resistance and the high temperature resistance of the valve are remarkably improved, and the sealing effect and the operation stability are enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to ball valve technical field, specifically is a kind of corrosion-resistant ceramic ball valve of full lining. BACKGROUND

[0002] The ball valve on market, there is hard sealing and soft sealing ball valve, and widely used, the opening and closing member (valve ball) of ball valve is driven by valve stem, and the valve door that rotates around ball core axis movement. Ball valve is mainly used to cut off, distribute and change the flow direction of medium in pipeline, it only needs to use the operation of rotation 90 degrees and small torque to close tightly. Ball valve is most suitable for switch, cut off, regulating valve use.

[0003] But the ball valve of existing market generally has following shortcomings:

[0004] 1, the ball valve on market usually adopts the way of partial ceramic lining or ceramic piece, cannot realize full ceramic lining, this design has the limitation in acid and alkali corrosion resistance, wear resistance, high temperature resistance, especially in strong corrosive medium, partial ceramic ball valve is prone to corrosion and wear, lead to shorter valve life;

[0005] 2, ceramic and metal cooperation mode is adhesive or fixed, once valve fault needs to be replaced as a whole, maintenance cost is high and not environmental protection. INVENTION CONTENTS

[0006] In view of above problem, the utility model provides a kind of corrosion-resistant ceramic ball valve of full lining that realizes full ceramic lining and is convenient to maintain, improves sealing performance.

[0007] The utility model discloses a kind of corrosion-resistant full-lining ceramic ball valves, including the three-section combined structure of valve body and the two valve covers of symmetrical arrangement;Ceramic middle body is arranged in the valve body central cavity, the ceramic middle body outer diameter is transition fit with valve body inner diameter;Ceramic ball is installed in the ceramic middle body inner cavity, the ceramic ball is connected with drive actuator by valve stem, the ceramic ball is vertically arranged with valve stem and ceramic ball and valve stem square head tangential;Two ceramic valve seats of symmetrical arrangement, two ceramic valve seats are all ground with ceramic ball, the surface roughness of ceramic valve seat sealing surface and ceramic ball sealing surface is Ra0.1;Ceramic connector is installed in valve cover, ceramic connector outer diameter is clearance fit with valve cover inner step;PTFE bushing is sleeved on the valve stem, and static pressure seal is formed by PTFE bushing, packing assembly and ceramic middle body through the compression of valve stem;The packing assembly includes packing, packing press sleeve and pressing plate arranged in sequence, the valve stem outer diameter is matched with the inner diameter of packing, the outer diameter of packing is matched with the packing function of valve stem, and packing press sleeve and pressing plate are pressed down to packing, and adjustable packing extrusion seal is formed by pressing plate bolt and pressing plate;It also includes the multistage sealing assembly of valve seat groove sealing ring, connector sealing ring, body cover sealing ring, valve seat rear sealing ring.

[0008] As preferred, the ceramic middle body outer diameter is transition fit with the 0.05mm~0.15mm gap of metal valve body inner diameter, and the ceramic connector outer diameter is clearance fit with the 0.05mm~0.15mm gap of valve cover inner step.

[0009] As preferred, the ceramic valve seat groove outer diameter is clearance fit with the 0.2mm~0.3mm gap of ceramic middle body inner diameter, and the valve seat groove sealing ring is arranged in the ceramic valve seat groove between the ceramic valve seat and the ceramic middle body, to form piston seal, and the sealing ring compression ratio is 12% of the sealing ring linear diameter.

[0010] As preferred, the valve seat rear sealing ring is arranged at the right angle of the large step and the small step of the ceramic valve seat.

[0011] As preferred, the ceramic valve seat small step outer diameter is clearance fit with the 0.2mm~0.3mm gap of valve cover inner diameter.

[0012] As preferred, the ceramic connector inner step is clearance fit with the 0.2mm~0.3mm gap of ceramic valve seat small step outer diameter, and the connector sealing ring is arranged between the ceramic connector inner step and the ceramic valve seat small step to form piston seal, and the sealing ring compression ratio is 12% of the sealing ring linear diameter.

[0013] As preferred, the valve body inner step is clearance fit with the 0.05mm~0.1mm gap of valve cover boss outer diameter, and the body cover sealing ring is arranged between the valve body inner step and the valve cover boss to form static pressure seal, and the sealing ring compression ratio is 30% of the sealing ring linear diameter.

[0014] As preferred, the PTFE sleeve outer diameter matches with the valve stem packing box inner diameter, the PTFE sleeve bottom end is tangent to the ceramic middle body valve stem hole step, and the valve stem outer diameter matches with the PTFE sleeve inner diameter and the packing inner diameter.

[0015] As preferred, the ceramic ball matches with the valve stem flat square gap and the gap is ≤0.05mm.

[0016] As preferred, the valve stem square head is connected with the driving shaft of the driving actuator through a support, the support is arranged on the valve body support platform and is fixed through an outer hexagonal bolt, and the support is perpendicular to the valve stem.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. The utility model discloses a ceramic ball, a ceramic valve seat, a ceramic middle body, a ceramic connector and other key components all adopt ceramic materials, realize the full ceramic lining structure, and the design significantly improves the corrosion resistance, wear resistance and high temperature resistance of the valve, and is suitable for the environment of strong acid, strong alkali and other corrosive media.

[0019] 2. The cooperation between the ceramic lining of the valve and the valve metal valve body and the valve cover is detachable design, convenient to maintain, can utilize the undamaged ceramic components for many times, and reduces the maintenance cost.

[0020] 3. The utility model also adopts the precise cooperation and sealing between various structural members, the three-section combined structure of the valve body and the valve cover, the double sealing of the PTFE sleeve and the packing, and the integrated valve stem, and the sealing effect and the operation stability are enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the three-dimensional structure schematic diagram of the utility model;

[0022] Figure 2 It is Figure 1 the sectional view along A-A. DETAILED DESCRIPTION

[0023] The utility model will be combined with the specific implementation below Figures 1-2 The utility model discloses a ceramic valve, and the specific implementation will be explained to the utility model, but does not as the limitation to the utility model.

[0024] The application relates to a corrosion-resistant full-lining ceramic ball valve, which comprises a three-section combined structure of a valve body 1 and two symmetrically arranged valve covers 2, and the valve body and the valve cover are made of metal; a ceramic middle body 3 arranged in the central cavity of the valve body 1, the outer diameter of the ceramic middle body and the inner diameter of the valve body 1 form a transition fit with a gap of 0.05mm-0.15mm, so as to ensure the installation and dismounting of the ceramic middle body; a ceramic ball 4 installed in the inner cavity of the ceramic middle body, the ceramic ball is connected with a driving actuator through a valve rod 5, the ceramic ball is arranged perpendicularly to the valve rod and the ceramic ball is tangent to the square head of the valve rod, specifically, the square head of the valve rod is connected with the driving shaft of the driving actuator through a support 18, the support is arranged on the support platform of the valve body and is fixed through an outer hexagonal bolt, meanwhile, the support is arranged perpendicularly to the valve rod, the ceramic ball is in gap fit with the flat square of the valve rod and the gap is less than or equal to 0.05mm, the valve rod is integral from the ceramic ball hole to the driving actuator, without the need of an adapter sleeve, so as to improve the driving stability of the valve and improve the adjusting precision; two symmetrically arranged ceramic valve seats 6, the two ceramic valve seats are ground with the ceramic ball, so that the ceramic ball surface and the ceramic valve seat sealing surface are tightly attached to each other, the surface roughness of the ceramic valve seat sealing surface and the ceramic ball sealing surface is Ra0.1, and the ceramic ball and the ceramic valve seat only need to be in contact to form a seal; a ceramic connecting pipe 7 installed in the valve cover 2, the outer diameter of the ceramic connecting pipe and the inner step of the valve cover form a gap fit with a gap of 0.05mm-0.15mm; the outer diameter of the small step of the ceramic valve seat and the inner diameter of the valve cover form a gap fit with a gap of 0.2mm-0.3mm; a PTFE shaft sleeve 11 is sleeved on the valve rod, the PTFE shaft sleeve forms a static pressure seal with the ceramic middle body through the valve rod, the compression of the packing assembly and the ceramic middle body; the packing assembly comprises a packing 12, a packing pressing sleeve 13 and a pressing plate 14 arranged in sequence, the outer diameter of the valve rod is matched with the inner diameter of the packing, the outer diameter of the packing is matched with the packing chamber of the valve rod, the packing pressing sleeve and the pressing plate press the packing downwards, and the packing extrusion seal can be adjusted through a pressing plate bolt 15 and a pressing plate nut 16; the application further comprises a multi-stage sealing assembly composed of a valve seat groove sealing ring 8, a connecting pipe sealing ring 9, a body cover sealing ring 10 and a valve seat rear sealing ring 17, the valve seat rear sealing ring is arranged at the right angle between the large step and the small step of the ceramic valve seat.

[0025] The outer diameter of the ceramic valve seat groove is matched with the inner diameter of the ceramic middle body with a gap of 0.2mm-0.3mm, the valve seat groove sealing ring is arranged in the ceramic valve seat groove between the ceramic valve seat and the ceramic middle body, so as to form a piston seal, the sealing ring compression ratio is 12% of the linear diameter of the sealing ring, and the first inner cavity seal is formed; the inner step of the valve body is matched with the outer diameter of the valve cover boss with a gap of 0.05mm-0.1mm, the body cover sealing ring is arranged between the inner step of the valve body and the valve cover boss, so as to form a static pressure seal, the sealing ring compression ratio is 30% of the linear diameter of the sealing ring, and the second inner cavity seal is formed to prevent external leakage.

[0026] The inner step of the ceramic connector is matched with the outer diameter of the small step of the ceramic valve seat by a gap of 0.2mm-0.3mm, the connector sealing ring is arranged between the inner step of the ceramic connector and the small step of the ceramic valve seat to form a piston seal, the compression ratio of the sealing ring is 12% of the linear diameter of the sealing ring, and a channel seal is formed.

[0027] The outer diameter of the PTFE shaft sleeve is matched with the inner diameter of the stuffing box of the valve rod, the bottom end of the PTFE shaft sleeve is tangent to the step of the valve rod hole of the ceramic middle body, the valve rod, the packing, the packing pressing sleeve and the pressing plate are compressed, the PTFE shaft sleeve is forced to form a first static pressure seal with the ceramic middle body, and meanwhile, the outer diameter of the valve rod is matched with the inner diameter of the PTFE shaft sleeve and the inner diameter of the packing to form a second packing extrusion seal.

[0028] In the implementation process, the ball valve is installed by the following steps:

[0029] S1, the outer diameter of the ceramic middle body is arranged in the inner diameter of the valve body, the valve rod hole of the ceramic middle body is ensured to be concentric with the valve rod hole of the valve body, then the outer diameter of the PTFE shaft sleeve is arranged in the valve rod hole of the valve body and matched with the inner step of the valve rod hole of the ceramic middle body to position the center position of the ceramic middle body;

[0030] S2, the body cover sealing ring is arranged between the ceramic middle body and the inner step of the valve body;

[0031] S3, the ceramic ball is arranged in the inner cavity of the ceramic middle body, meanwhile, the valve rod flat square is matched with the valve rod hole of the ceramic ball, and the valve rod step is matched with the inner step of the PTFE shaft sleeve;

[0032] S4, the packing is arranged in the valve rod stuffing box, the inner diameter of the packing is matched with the outer diameter of the valve rod, the packing pressing sleeve is arranged on the packing, the inner diameter of the packing is matched with the outer diameter of the valve rod, the pressing plate bolt is arranged, the pressing plate is arranged on the packing pressing sleeve, the pressing plate bolt hole is matched with the pressing plate bolt, the pressing plate nut is arranged, the compression tightness is adjusted, and it is ensured that the pressing plate can be rotated by hand;

[0033] S5, the ceramic valve seat groove sealing ring is arranged in the ceramic valve seat groove, then the outer diameters of the left and right ceramic valve seat grooves are arranged in the inner diameter of the ceramic middle body, meanwhile, the sealing surface of the ceramic valve seat is abutted with the sealing surface of the ceramic ball, it is ensured that the ceramic valve seat can be slightly moved by 360°, and the rear sealing ring of the valve seat is arranged at the right angle between the large step and the small step of the ceramic valve seat;

[0034] S6, the valve cover boss is matched with the inner step of the valve body, the flange hole of the valve body is concentric with the flange hole of the valve cover, the two end surfaces are tangent, and then the locking bolt is tightened;

[0035] S7, the connector sealing ring is arranged at the inner step of the ceramic connector, the outer diameter of the ceramic connector is matched with the inner step of the valve cover, the inner diameter of the connector sealing ring is extruded and matched with the outer diameter of the small step of the ceramic valve seat;

[0036] S8, the bracket is installed on the valve body support platform, is fixed with the outer hexagonal bolt and is perpendicular to the valve stem, and the valve stem square head is higher than the bracket and is connected with the actuator driving shaft.

[0037] The ceramic ball is rotated around the ball core axis by the assembled ball valve inner valve stem, so as to cut off, distribute and change the flow direction of the medium, meanwhile, ceramic materials are used in the key parts such as the ceramic ball, the ceramic valve seat, the ceramic middle body and the ceramic connector, a full ceramic lining structure is realized, the corrosion resistance, the wear resistance and the high temperature resistance of the valve are significantly improved, and the valve is suitable for the environment of strong acid, strong alkali and other corrosive media.

[0038] The above describes the technical solutions provided by the embodiments of the utility model in detail, the principles and implementation manners of the embodiments of the utility model are described by applying specific examples, the above embodiment description is only applicable to helping understanding the principles of the embodiments of the utility model; meanwhile, for the general technical personnel in the field, the embodiments of the utility model will have changes in the specific implementation manners and application ranges, and the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A corrosion resistant, fully lined ceramic ball valve, characterized by: The structure comprises a three-section assembly consisting of a valve body (1) and two symmetrically arranged valve covers (2); a ceramic inner body (3) disposed in the central cavity of the valve body (1), the outer diameter of which is in transition fit with the inner diameter of the valve body (1); a ceramic ball (4) installed in the inner cavity of the ceramic inner body, the ceramic ball being connected to the drive actuator via a valve stem (5), the ceramic ball being perpendicular to the valve stem and tangent to the square head of the valve stem; two symmetrically arranged ceramic valve seats (6), both of which are ground to fit the ceramic ball, the surface roughness of the sealing surface of the ceramic valve seat and the sealing surface of the ceramic ball being Ra0.1; and a ceramic connecting pipe (7) installed in the valve cover (2), the outer diameter of which is... The valve cover is fitted with a step clearance; a PTFE bushing (11) is fitted on the valve stem, and the PTFE bushing forms a static pressure seal with the ceramic body through the compression of the valve stem and the packing assembly; the packing assembly includes a packing (12), a packing sleeve (13) and a pressure plate (14) arranged in sequence, the outer diameter of the valve stem fits with the inner diameter of the packing, the outer diameter of the packing fits with the valve stem packing gland, the packing sleeve and the pressure plate press the packing downwards, and an adjustable packing compression seal is formed by the pressure plate bolt (15) and the pressure plate nut (16); it also includes a multi-stage sealing assembly composed of a valve seat groove sealing ring (8), a pipe sealing ring (9), a body cover sealing ring (10) and a valve seat rear sealing ring (17).

2. The corrosion resistant fully lined ceramic ball valve according to claim 1, wherein: The outer diameter of the ceramic inner tube forms a transition fit with the inner diameter of the metal valve body, with a gap of 0.05mm to 0.15mm. The outer diameter of the ceramic connecting tube forms a clearance fit with the inner step of the valve cover, with a gap of 0.05mm to 0.15mm.

3. The corrosion resistant fully lined ceramic ball valve according to claim 1, wherein: The outer diameter of the ceramic valve seat groove and the inner diameter of the ceramic body form a clearance fit of 0.2mm to 0.3mm. The valve seat groove sealing ring is located in the ceramic valve seat groove between the ceramic valve seat and the ceramic body to form a piston seal. The sealing ring compression ratio is 12% of the sealing ring diameter.

4. The corrosion resistant fully lined ceramic ball valve according to claim 1, wherein: The valve seat rear sealing ring is located at the right angle between the large step and the small step of the ceramic valve seat.

5. The corrosion resistant, fully lined ceramic ball valve of claim 1, wherein: The outer diameter of the small step of the ceramic valve seat forms a clearance fit of 0.2mm to 0.3mm with the inner diameter of the valve cover.

6. The corrosion resistant, fully lined ceramic ball valve of claim 1, wherein: The inner step of the ceramic connector and the outer diameter of the small step of the ceramic valve seat form a clearance fit of 0.2mm to 0.3mm. The connector sealing ring is set between the inner step of the ceramic connector and the small step of the ceramic valve seat to form a piston seal. The sealing ring pressure ratio is 12% of the sealing ring wire diameter.

7. The corrosion resistant, fully lined ceramic ball valve of claim 1, wherein: The valve body step and the valve cover boss have a clearance fit of 0.05mm to 0.1mm. The valve body cover sealing ring is placed between the valve body step and the valve cover boss to form a static pressure seal. The sealing ring compression ratio is 30% of the sealing ring wire diameter.

8. The corrosion resistant, fully lined ceramic ball valve of claim 1, wherein: The outer diameter of the PTFE bushing matches the inner diameter of the valve stem stuffing box, and the bottom end of the PTFE bushing is tangent to the step of the valve stem hole in the ceramic body. At the same time, the outer diameter of the valve stem matches the inner diameter of the PTFE bushing and the inner diameter of the stuffing box.

9. The corrosion resistant, fully lined ceramic ball valve of claim 1, wherein: The ceramic ball is fitted with the valve stem with a square clearance of ≤0.05mm.

10. The corrosion resistant, fully lined ceramic ball valve of claim 1, wherein: The square head of the valve stem passes through the bracket (18) and is connected to the drive shaft of the actuator. The bracket is located on the valve body bracket platform and is fixed by external hexagonal bolts. At the same time, the bracket is set perpendicular to the valve stem.

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