CN106969155A - A kind of high temperature butterfly valve door - Google Patents

Abstract

The invention discloses a high-temperature butterfly valve, which comprises a valve body, a butterfly plate, a valve stem, a valve stem sleeve and a bottom cover. A keyway is arranged axially on the inner wall of the connecting hole, and a flat key matching the keyway is fixed axially on the valve stem; a sealing ring installation gap is arranged on the butterfly plate aligned with the valve seat, and the sealing ring installation gap A metal sealing ring is arranged inside, and a spring gland is arranged outside the installation gap of the sealing ring. A spring positioning groove is arranged on the inner wall of the spring gland, and a positioning spring is arranged in the spring positioning groove. The other end is provided with a sealing ring installation groove, and a C-shaped sealing ring is arranged in the sealing ring installation groove, and the C-shaped sealing ring is connected with the inner wall surface of the sealing ring installation gap. The above-mentioned technical scheme has a reasonable structure design, a simple structure, is not easy to swell, has good sealing performance, good safety, and is convenient to use.

Description

A high temperature butterfly valve

technical field

The invention relates to the technical field of valves, in particular to a high-temperature butterfly valve.

Background technique

Butterfly valve, also known as flap valve, is a regulating valve with simple structure, which can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. The structure of the existing butterfly valve generally includes a valve body, a valve stem, a disc plate, a bottom cover, etc., and the valve plate rotates on the inner cavity of the valve body under the action of the valve stem to realize the function of opening or closing the inner cavity of the valve body.

The existing butterfly valve structure still has deficiencies: the existing butterfly valve is under high-temperature or temperature-alternating working conditions, the valve is swollen and cannot be opened due to expansion between parts, and the sealing performance is poor, which is prone to leakage and poor safety. The service life is short; the connection between the valve stem and the butterfly plate is troublesome, and it is inconvenient to assemble and disassemble.

Contents of the invention

Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a high-temperature butterfly valve with reasonable structural design, simple structure, not easy to swell, good sealing performance, good safety and easy to use.

In order to achieve the above object, the present invention provides the following technical solutions: a high-temperature butterfly valve, including a valve body, a butterfly plate, a valve stem, a valve stem sleeve and a bottom cover, a valve seat is fixedly arranged in the valve body, and the butterfly plate A valve stem connection hole is provided in the inner axial direction, and a keyway is axially provided on the inner wall surface of the valve stem connection hole, and a flat key matching the keyway is fixedly arranged on the valve stem in the axial direction. The lower end of the rod passes through the connecting hole of the valve stem, and the flat key is connected with the keyway; the butterfly plate is aligned with the position of the valve seat to be provided with a seal ring installation gap, and a metal seal ring is arranged in the seal ring installation gap, and the seal A spring gland is arranged outside the ring installation gap, and a spring positioning groove is arranged on the inner wall of the spring gland, and a positioning spring is arranged in the spring positioning groove, and one end of the positioning spring is connected with the spring gland, and the positioning spring The other end is connected with the metal sealing ring, and the other end of the metal sealing ring relative to the positioning spring is provided with a sealing ring installation groove, and a C-shaped sealing ring is arranged in the sealing ring installation groove, and the C-shaped sealing ring and the sealing ring Install the connection on the inner wall of the notch.

By adopting the above technical scheme, the valve stem and the butterfly plate are connected by flat keys, which are easy to assemble and disassemble. There is a radial gap between the butterfly plates. Under high temperature or temperature alternating conditions, it can shrink radially under the action of the positioning spring to ensure that the valve will not swell due to expansion between parts. It can also ensure that the valve is well sealed, not easy to leak, and has a long service life; the structure design is reasonable, the structure is simple, the use is convenient, and the practicability is good.

The present invention is further configured as follows: the spring gland is provided with connecting screws, and the spring gland is connected and fixed to the butterfly plate through the connecting screws. With this setting, the spring gland is conveniently connected and fixed reliably.

The present invention is further provided that: the C-shaped sealing ring is a metal sealing ring, and the opening of the C-shaped sealing ring is arranged axially. Through this setting, the C-shaped sealing ring is set reasonably, and the C-shaped sealing ring and the metal sealing ring form two sealing defense lines inside and outside, and the sealing performance is better.

The present invention is further configured as follows: the valve seat is provided with a tapered sealing surface, and a metal wear-resistant layer is welded on the tapered sealing surface; the metal sealing ring is provided with a sealing ring aligned with the metal wear-resistant layer A sealing surface, the sealing surface of the sealing ring is in sealing connection with the metal wear-resistant layer. Through this setting, the structural setting is more reasonable, the sealing performance is better, and the service life of the valve is longer.

The present invention is further configured as follows: the lower end of the valve stem sleeve is fixedly connected with the upper end of the valve body, the upper end of the valve stem is set through the valve stem sleeve, and a packing cavity is arranged between the upper end of the valve stem sleeve and the valve stem. The stuffing chamber is provided with stuffing, and the valve stem sleeve is detachably provided with a stuffing gland for closing the upper end opening of the stuffing chamber. Through this setting, the structural setting is more reasonable, and the sealing performance is good.

The present invention is further set as follows: the filler is an oxidation-resistant high-temperature solid special filler, a filler cavity sealing ring groove is arranged at the bottom of the filler cavity, and a metal C-shaped sealing ring is axially arranged in the filler cavity sealing ring groove, A separation gasket is arranged between the metal C-shaped sealing ring and the filler. Through this setting, the metal C-shaped sealing ring is combined with oxidation-resistant high-temperature solid special packing, which can be used under high-temperature aerobic conditions, and eliminates the failure of flexible graphite packing due to oxidation.

The present invention is further set as follows: the lower end of the valve body is provided with a valve stem positioning hole, the lower end of the valve stem is located in the valve stem positioning hole, and the lower port of the valve stem positioning hole is provided with a valve stem positioning groove, and the valve stem positioning groove is provided with a There is a valve stem bearing, and the valve stem bearing is integrated with the valve stem, and the bottom cover is fixedly connected with the lower port of the valve stem positioning hole of the valve body. Through this setting, the structure of the valve body is more reasonable, the positioning of the valve stem is reliable, and the operation is stable.

The present invention is further configured as follows: the lower end of the valve stem is covered with a stainless steel sleeve, and the lower end of the stainless steel sleeve is connected to the upper end surface of the valve stem bearing. Through this arrangement, the flexibility of rotation at the bottom of the valve stem is improved.

The present invention is further set as follows: the center of the valve stem is set eccentrically with the center of the flow channel of the valve body; the center of the valve stem is set eccentrically with the sealing center of the metal sealing ring. With this arrangement, the structure is simple and easy to process.

The present invention is further configured as follows: the packing gland is provided with several connecting bolts, and the packing gland is connected and fixed with the upper end surface of the valve stem sleeve through the connecting bolts. With this setting, the packing gland is conveniently connected and fixed reliably.

The advantages of the present invention are: compared with the prior art, the structural setting of the present invention is more reasonable; the valve stem and the butterfly plate are simply connected by a flat key; After setting the positioning spring and C-shaped sealing ring, there is a radial gap between the metal sealing plate and the butterfly plate. Under high temperature or temperature alternating conditions, it can shrink radially under the action of the positioning spring to ensure that the valve does not The valve will swell and cannot be opened due to the expansion between parts, and at the same time, it can ensure that the valve is well sealed, not easy to leak, and has a long service life; the structure design is reasonable, simple in structure, convenient to use, and good in practicability.

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is the structural representation of the embodiment of the present invention;

Fig. 2 is the enlarged schematic diagram of part I in Fig. 1;

Fig. 3 is a schematic top view of an embodiment of the present invention;

FIG. 4 is an enlarged schematic view of part II in FIG. 1 .

detailed description

Referring to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, a high temperature butterfly valve disclosed by the present invention includes a valve body 1, a butterfly plate 2, a valve stem 3, a valve stem sleeve 4 and a bottom cover 5, the valve body 1 A valve seat 6 is fixed inside, a valve stem connecting hole 21 is arranged axially inside the butterfly plate 2, a keyway 211 is axially arranged on the inner wall surface of the valve stem connecting hole 21, and the upper shaft of the valve stem 3 A flat key 7 matching the keyway 211 is fixedly arranged, the lower end of the valve stem 3 passes through the stem connection hole 21, and the flat key 7 is connected with the keyway 211; the butterfly plate 2 is aligned with the valve seat 6 A sealing ring installation gap 22 is provided at the position, and a metal sealing ring 8 is arranged in the sealing ring installation gap 22, and a spring gland 9 is arranged outside the sealing ring installation gap 22, and the inner wall surface of the spring gland 9 A spring positioning groove 91 is provided, and a positioning spring 10 is arranged in the spring positioning groove 91. One end of the positioning spring 10 is connected with the spring cover 9, and the other end of the positioning spring 10 is connected with the metal sealing ring 8, and the metal sealing ring 8 Relative to the other end of the positioning spring 10, a sealing ring installation groove 81 is provided, and a C-shaped sealing ring 11 is arranged in the sealing ring installation groove 81, and the inner wall surface of the C-shaped sealing ring 11 and the sealing ring installation gap 22 connect.

Preferably, the flat key 7 and the valve stem 3 are integrally arranged or the flat key 7 and the valve stem 3 are fixed by welding; the positioning spring 10 is a nickel alloy spring, and the metal sealing ring 8 is made of an existing metal wear-resistant material. The valve seat 6 and the valve body 1 are integrally arranged or fixed by welding; the spring cover 9 is limited to the positioning spring 10, and under the action of the positioning spring 10, the metal sealing ring 8 approaches the inner wall surface of the sealing ring installation gap 22 , so that the C-shaped sealing ring 11 is pressed against the inner wall surface of the sealing ring installation notch 22 .

In order to make the structure of the present invention more reasonable, preferably, the spring gland 9 in this embodiment is provided with connecting screws 12 , and the spring gland 9 is connected and fixed to the butterfly plate 2 through the connecting screws 12 .

The C-shaped sealing ring 11 is a metal sealing ring, and the opening of the C-shaped sealing ring 11 is arranged axially.

The valve seat 6 is provided with a conical sealing surface 61, and a metal wear-resistant layer 13 is welded on the conical sealing surface 61; the metal sealing ring 8 is aligned with the metal wear-resistant layer 13 and provided with a sealing ring seal The sealing surface 82 of the sealing ring is in sealing connection with the metal wear-resistant layer 13 .

The lower end of the valve stem sleeve 4 is fixedly connected to the upper end of the valve body 1, the upper end of the valve stem 3 is set through the valve stem sleeve 4, and a packing cavity 41 is arranged between the upper end of the valve stem sleeve 4 and the valve stem 1, The stuffing chamber 41 is provided with a stuffing 14 , and the valve stem sleeve 4 is detachably provided with a stuffing gland 15 for closing the upper end opening of the stuffing chamber 41 . Preferably, the packing 14 is an oxidation-resistant high-temperature solid special packing, and a packing chamber sealing ring groove 411 is arranged at the bottom of the packing chamber 41, and a metal C-shaped sealing ring is axially arranged in the packing chamber sealing ring groove 411 17. A separation gasket 18 is provided between the metal C-shaped sealing ring 17 and the packing 14.

The lower end of the valve body 1 is provided with a valve stem positioning hole 19, the lower end of the valve stem 3 is located in the valve stem positioning hole 19, and the lower port of the valve stem positioning hole 19 is provided with a valve stem positioning groove 20, and the valve stem positioning groove 20 is set There is a valve stem bearing 23, and the valve stem bearing 23 is integrated with the valve stem 3, and the bottom cover 5 is fixedly connected with the lower port of the valve stem positioning hole 19 of the valve body 1. One-piece stem bearing, surfacing or spray welding hard alloy directly on the stem.

The lower end of the valve stem 3 is covered with a stainless steel sleeve 24 , and the lower end of the stainless steel sleeve 24 is connected to the upper surface of the valve stem bearing 23 .

The center of the valve stem 3 is set eccentrically to the center of the flow channel of the valve body 1 ; the center of the valve stem 3 is set eccentrically to the sealing center of the metal sealing ring 8 . The double eccentric right conical structure is easier to process than the triple eccentric structure.

The packing gland 15 is provided with several connecting bolts 25 , and the packing gland 15 is connected and fixed with the upper end surface of the valve stem sleeve 4 through the connecting bolts 25 .

The valve body 1 is forged and welded, has no leakage points, and meets the reliability requirements of high-temperature working conditions.

In actual application, the valve stem and the butterfly plate are connected by a flat key, which is easy to assemble and disassemble, and the opening and closing torque transmitted by the flat key is safe. There is a radial gap between them. Under high temperature or temperature alternating conditions, they can shrink radially under the action of the positioning spring to ensure that the valve will not be swollen and unable to open due to expansion between parts. At the same time, it can also ensure that the valve is well sealed, not easy to leak, and has a long service life; the structure design is reasonable, the structure is simple, the use is convenient, and the practicability is good.

The specific description of the present invention in the above-mentioned embodiments is only used to further illustrate the present invention, and can not be interpreted as limiting the protection scope of the present invention. Technical engineers in the field make some non-essential improvements and adjustments to the present invention according to the content of the above-mentioned invention. Into the protection scope of the present invention.

Claims (10)

1. a kind of high temperature butterfly valve door, including valve body (1), butterfly plate (2), valve rod (3), valve stem sleeve (4) and bottom (5), the valve body (1) valve seat (6) is fixedly installed in, it is characterised in that：A valve rod connecting hole (21) is axially provided with the butterfly plate (2), It is axially arranged on valve rod connecting hole (21) internal face to there is axial restraint on a keyway (211), the valve rod (3) to be provided with One flat key (7) for being matched with the keyway (211), valve rod (3) lower end passes through valve rod connecting hole (21), the flat key (7) it is connected with keyway (211)；Described butterfly plate (2) alignment valve seat (6) position is provided with a sealing ring installation gap (22), should It is provided with sealing ring installation gap (22) outside a metal o-ring (8), the sealing ring installation gap (22) and is provided with one A spring locating slot (91), the spring locating slot are provided with individual spring capping (9), spring capping (9) internal face (91) retaining spring (10) is provided with, described retaining spring (10) one end is connected with spring capping (9), retaining spring (10) is another One end is connected with metal o-ring (8), and metal o-ring (8) is provided with a sealing relative to the other end of retaining spring (10) Enclose in mounting groove (81), the sealing ring mounting groove (81) and be provided with a c-type sealing ring (11), the c-type sealing ring (11) It is connected with the internal face of sealing ring installation gap (22).

2. a kind of high temperature butterfly valve door according to claim 1, it is characterised in that：The company of being provided with the spring capping (9) Screw (12) is connect, the spring capping (9) is connected by attachment screw (12) with butterfly plate (2).

3. a kind of high temperature butterfly valve door according to claim 2, it is characterised in that：The c-type sealing ring (11) is that metal is close Seal, and the opening of c-type sealing ring (11) is axially arranged.

4. a kind of high temperature butterfly valve door according to claim 3, it is characterised in that：It is close that taper is provided with the valve seat (6) Layer of metal wearing layer (13) is welded with front cover (61), the conical seal (contact) face (61)；Metal o-ring (8) the alignment gold Category wearing layer (13) is provided with a sealing ring sealing surface (82), and the sealing ring sealing surface (82) and non-metallic wear resistant layer (13) are close Envelope connection.

5. a kind of high temperature butterfly valve door according to claim 4, it is characterised in that：Valve stem sleeve (4) lower end and valve body (1) Upper end be fixedly connected, the upper end of the valve rod (3) is set through valve stem sleeve (4), valve stem sleeve (4) upper end and valve rod (1) Between be provided with packing cavity (41), be provided with filler (14), and valve stem sleeve (4) in the packing cavity (41) and be detachably provided with use In the gland (15) of closing packing cavity (41) upper surface opening.

6. a kind of high temperature butterfly valve door according to claim 5, it is characterised in that：The filler (14) is solid for resistance to oxidation high temperature Power spy's filler, packing cavity (41) bottom is provided with a packing cavity seal groove (411), the packing cavity seal groove (411) metal C-shaped sealing ring (17) is axially provided with, is provided between the metal C-shaped sealing ring (17) and filler (14) Separate spacers (18).

7. a kind of high temperature butterfly valve door according to claim 1, it is characterised in that：Valve body (1) lower end is provided with valve rod positioning Hole (19), valve rod (3) lower end is located in valve rod positioning hole (19), and valve rod positioning hole (19) lower port sets and determined with valve rod Stem bearing (23) is provided with position groove (20), the valve rod locating slot (20), and stem bearing (23) is integrally set with valve rod (3) Put, bottom (5) is fixedly connected with valve rod positioning hole (19) lower port of valve body (1).

8. a kind of high temperature butterfly valve door according to claim 7, it is characterised in that：Valve rod (3) lower end is arranged with stainless Steel bushing (24), the lower end of the stainless steel sleeve (24) is connected with the upper surface of stem bearing (23).

9. a kind of high temperature butterfly valve door according to claim 1, it is characterised in that：The center of the valve rod (3) and valve body (1) Runner center eccentric setting；The center of the valve rod (3) and the center seal eccentric setting of metal o-ring (8).

10. a kind of high temperature butterfly valve door according to claim 5, it is characterised in that：It is provided with the gland (15) Several connecting bolts (25), gland (15) is connected by the upper surface of connecting bolt (25) and valve stem sleeve (4).