Water pressure test plug valve

Abstract

The utility model discloses a hydraulic pressure test plug valve which comprises a valve body, a plug plate and a valve cover, and an axial cavity and a radial channel are arranged in the valve body. A convex step is arranged at the end part of the blocking plate and is embedded into the channel; an axial sealing ring is arranged between the bottom of the blocking plate and the valve body; a radial sealing ring is arranged between the step and the valve body; the valve cover is connected to the top of the valve body; double sealing is more reliable, the width of the sealing face of the valve body can be reduced, and therefore the inner diameter of a channel in the valve body is increased under the condition that other sizes are not changed. Under the condition that the boundary dimension of the valve is not changed, a larger-channel blocking valve is obtained, that is, on the premise that the cost is not increased, the flow resistance is further reduced, and therefore the requirements of users are better met.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to a water pressure test plugging valve. Background Art

[0002] Hydrostatic test plug valves are shutoff valves without actuators and are widely used in the main steam and reheat steam piping of power plant boilers. During hydrostatic testing, the valves are installed as part of the piping. During normal boiler operation, they function as a piping system. With the continuous improvement of boiler design parameters, integrally forged hydrostatic test plug valves are gradually replacing traditional cast plug valves.

[0003] Existing integrally forged hydrostatic test plug valves are used as pipelines during normal unit operation. Considering energy conservation and consumption reduction, users want the flow resistance of the plug valve to be as small as possible to minimize the pressure loss when steam flows through the plug valve. This requires the inner diameter D of the channel to be as large as possible. For the integrally forged plug valve, in order for the guide sleeve to be smoothly installed into the valve body, its related dimensions should satisfy the following relationship:

[0004]

[0005] In the above formula, N is the inner diameter of the cavity in the valve body, W is the width of the guide sleeve, D is the inner diameter of the channel in the valve body, and B is the width of the valve body sealing surface.

[0006] It can be seen from the above formula that when the inner diameter D of the channel increases, the inner diameter N of the valve body cavity also increases accordingly. At the same time, the outer dimensions of the flange outer diameter Q, the valve body bottom height H1, and the valve body top height H2 of the valve body will all increase, resulting in a significant increase in the weight of the forging billet and the valve body, as well as an increase in the forging billet cost and processing cost. Utility Model Content

[0007] In order to solve at least one of the above-mentioned problems existing in the water pressure test plugging valve of the prior art, the utility model provides a water pressure test plugging valve, which can form a double sealing structure, making the sealing more reliable; at the same time, it is conducive to reducing the width B of the valve body sealing surface, thereby facilitating the increase of the inner diameter D of the channel when other dimensions remain unchanged; and further facilitating the realization of a plugging valve with a larger channel when the external dimensions remain unchanged, that is, without increasing the cost, further reducing the flow resistance, which is conducive to better meeting the requirements of users.

[0008] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0009] The utility model provides a water pressure test plug valve, comprising a valve body, a plugging plate and a valve cover, the valve body having an internal axial cavity and a radial channel; a raised step is provided at the end of the plugging plate, and the step is embedded in the channel; an axial sealing ring is provided between the bottom of the plugging plate and the valve body, and a radial sealing ring is provided between the step and the valve body; the valve cover is connected to the top of the valve body.

[0010] The water pressure test plugging valve of the utility model is embedded in the channel of the valve body by the step of the plugging plate, thereby retaining the original axial static sealing structure of the axial sealing ring, and at the same time increasing the radial static sealing structure of the radial sealing ring, forming a double sealing mode of axial static sealing and radial static sealing, making the sealing more reliable; the step plays a supporting and protective role for the axial sealing ring, so that the width B of the valve body sealing surface can be further reduced, thereby increasing the inner diameter D of the channel in the valve body when other dimensions remain unchanged, and obtaining a plugging valve with a larger channel when the valve outer dimensions remain unchanged; it is achieved that the flow resistance is further reduced without increasing the cost, thereby better meeting the requirements of users.

[0011] Preferably, the axial sealing ring and the radial sealing ring are both configured as O-rings.

[0012] Preferably, a support plate is provided in the valve body, and the support plate is connected to the blocking plate.

[0013] Preferably, the support plate and the blocking plate are connected via a pre-tightening screw.

[0014] Preferably, the valve cover is arranged in the top opening of the valve body, and a sealing ring, a gasket and a four-open ring are arranged between the valve cover and the valve body from bottom to top.

[0015] Preferably, a support plate is connected to the upper surface of the valve cover, and the valve cover is arranged in the top opening of the valve body.

[0016] Preferably, the sealing ring, the gasket, the four-open ring and the support plate are in contact with each other in sequence.

[0017] Preferably, the support plate is arranged in the top opening of the valve body.

[0018] The beneficial effects of the water pressure test plug valve of the utility model are:

[0019] The hydraulic test plugging valve of the present invention improves the soft sealing structure of the plugging plate of the prior art, replaces the flat plugging valve of the prior art with a stepped plugging plate, and embeds the step of the plugging plate into the channel of the valve body, thereby adding a radial sealing ring, forming a double sealing structure including an axial sealing ring and a radial sealing ring, making the seal more reliable; during the design, the comprehensive economic efficiency of the valve's external dimensions and flow resistance can be comprehensively considered to select a suitable inner diameter D of the channel in the valve body and the width B of the valve body sealing surface. Since the stepped plugging plate is embedded in the channel of the valve body, the axial sealing ring is supported and protected by the step of the plugging plate, and the width B of the valve body sealing surface can be further reduced, thereby increasing the inner diameter D of the channel in the valve body while keeping other dimensions unchanged; in this way, a plugging valve with a larger channel can be obtained while keeping the external dimensions of the valve unchanged, that is, the flow resistance can be further reduced without increasing the cost, thereby better meeting the requirements of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 A schematic structural diagram of a water pressure test plug valve provided in one embodiment of the present utility model.

[0022] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0023] Figure 3 This is a schematic diagram of a water pressure test plug valve provided by one embodiment of the present invention when the unit is in normal operating state.

[0024] In the figure, 1 is the valve body, 201 is the axial sealing ring, 202 is the radial sealing ring, 3 is the blocking plate, 4 is the support plate, 5 is the pre-tightening screw, 6 is the valve cover, 7 is the sealing ring, 8 is the gasket, 9 is the four-open ring, 10 is the support plate, 11 is the guide sleeve, and 12 is the welded stainless steel. DETAILED DESCRIPTION

[0025] To make the purpose, technical solutions, and advantages of the present invention more clear, the following will provide a clear and complete description of the technical solutions of the present invention in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0026] The technical solutions provided by various embodiments of the present invention are described in detail below with reference to the accompanying drawings. Example

[0027] like Figure 1 and Figure 2 As shown, a water pressure test plugging valve includes a valve body 1, a plugging plate 3 and a valve cover 6. The valve body 1 has an internal axial cavity and a radial channel; a raised step is provided at the end of the plugging plate 3, and the step is embedded in the channel; an axial sealing ring 201 is provided between the bottom of the plugging plate 3 and the valve body 1, and a radial sealing ring 202 is provided between the step and the valve body 1; the valve cover 6 is connected to the top of the valve body 1.

[0028] The water pressure test plugging valve of this embodiment improves the soft sealing structure of the plugging plate 3 of the prior art, changes the flat plugging valve of the prior art into a stepped plugging plate 3, and embeds the steps of the plugging plate 3 into the channel of the valve body 1, thereby adding a radial sealing ring 202, forming a double sealing structure including an axial sealing ring 201 and a radial sealing ring 202, making the seal more reliable.

[0029] Please refer to Figure 3 During design, the valve's overall dimensions and the combined economic efficiency of flow resistance can be comprehensively considered to select the appropriate valve body channel inner diameter D and valve body sealing surface width B. Because the stepped plugging plate 3 is embedded in the channel of valve body 1, the axial sealing ring 201 is supported and protected by the steps of plugging plate 3. This further reduces the valve body sealing surface width B, thereby increasing the valve body channel inner diameter D while keeping other dimensions unchanged. This allows for a larger channel plugging valve while maintaining the same overall dimensions. This further reduces flow resistance without increasing costs, thereby better meeting user requirements.

[0030] like Figure 1 As shown, when the hydraulic test plug valve of this embodiment is in the hydraulic test state of the unit, Figure 1 The arrow in the middle indicates the pressure test direction, i.e., the flow direction of the pressure test medium. The pressure test medium can be boiler water.

[0031] like Figure 3 As shown, when the unit is operating normally, the water pressure test plugging valve of this embodiment is removed, and the plugging plate 3 is replaced with the guide sleeve 11.

[0032] like Figure 1 and Figure 2 As shown, the length of the axial cavity is vertical, and the length of the radial channel is horizontal. The central axes of the axial sealing ring 201 and the radial sealing ring 202 are both horizontal. A raised step is provided at one end of the blocking plate 3 and is embedded in the channel of the valve body 1.

[0033] Specifically, the axial sealing ring 201 and the radial sealing ring 202 are both configured as O-rings. The axial sealing ring 201 and the radial sealing ring 202 are both in close contact with the valve body 1 and the blocking plate 3.

[0034] In some embodiments, a support plate 4 is provided in the valve body 1 , and the support plate 4 is connected to the blocking plate 3 .

[0035] Specifically, the support plate 4 and the blocking plate 3 are connected via a pre-tightening screw 5 .

[0036] Then Figure 3 As shown, when the unit is working normally, the water pressure test plug valve of this embodiment is removed from the plug plate 3, the support plate 4 and the pre-tightening screw 5, and the guide sleeve 11 is replaced.

[0037] like Figure 1 As shown, in some embodiments, the valve cover 6 is disposed in the top opening of the valve body 1 , and a sealing ring 7 , a gasket 8 and a four-open ring 9 are sequentially disposed between the valve cover 6 and the valve body 1 from bottom to top.

[0038] Specifically, a support plate 10 is connected to the upper side of the valve cover 6 , and the valve cover 6 is disposed in the top opening of the valve body 1 .

[0039] The sealing ring 7, the gasket 8, the four-open ring 9 and the support plate 10 are in contact in sequence.

[0040] The support plate 10 is disposed in the top opening of the valve body 1 .

[0041] like Figure 2 As shown, a surfacing stainless steel 12 is provided between the axial sealing ring 201 and the valve body 1 .

[0042] The above are merely embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A hydraulic test plug valve, characterized in that: include: The valve body has an axial cavity and a radial passage therein; A blocking plate, the end of which is provided with a raised step, the step being embedded in the channel; an axial sealing ring is provided between the bottom of the blocking plate and the valve body, and a radial sealing ring is provided between the step and the valve body; A valve cover is connected to the top of the valve body.

2. The water pressure test plugging valve according to claim 1, characterized in that: The axial sealing ring and the radial sealing ring are both configured as O-rings.

3. The water pressure test plugging valve according to claim 1, characterized in that: A support plate is provided in the valve body, and the support plate is connected to the blocking plate.

4. The water pressure test plugging valve according to claim 3, characterized in that: The support plate and the blocking plate are connected via a pre-tightening screw.

5. The water pressure test plugging valve according to any one of claims 1 to 4, characterized in that: The valve cover is arranged in the top opening of the valve body, and a sealing ring, a gasket and a four-open ring are arranged in sequence from bottom to top between the valve cover and the valve body.

6. The water pressure test plugging valve according to claim 5, characterized in that: A support plate is connected to the upper surface of the valve cover, and the valve cover is arranged in the top opening of the valve body.

7. The water pressure test plugging valve according to claim 6, characterized in that: The sealing ring, the gasket, the four-open ring and the support plate are in contact with each other in sequence.

8. The water pressure test plugging valve according to claim 7, characterized in that: The support plate is disposed in the top opening of the valve body.

Images