CN210661421U - Hard-sealing zero-leakage knife gate valve with valve cover - Google Patents
Hard-sealing zero-leakage knife gate valve with valve cover Download PDFInfo
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- CN210661421U CN210661421U CN201921277449.7U CN201921277449U CN210661421U CN 210661421 U CN210661421 U CN 210661421U CN 201921277449 U CN201921277449 U CN 201921277449U CN 210661421 U CN210661421 U CN 210661421U
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Abstract
The utility model relates to a hard sealing zero leakage valve cap knife gate valve, which comprises a valve body, a flashboard, a valve rod, a valve cap, a bracket and a transmission mechanism, wherein a sealing cavity is arranged between the upper end of the valve cap and the outer circular surface of the valve rod, sealing filler is arranged in the sealing cavity, and a closed flashboard cavity is formed between the valve cap and the valve body; the method is characterized in that: the plane sealing valve seat at the inlet side of the valve body is in hard sealing fit with the plane sealing surface at the inlet side of the flashboard by adopting a mirror surface; and a movable metal sealing seat with a wedge-shaped sealing ring is arranged in the outlet channel of the valve body, and the outlet side of the flashboard is provided with a wedge-shaped sealing surface matched with the wedge-shaped sealing ring of the movable metal sealing seat. The sealing area is small, the sealing performance of the middle cavity is reliable, the circumferential sealing specific pressure of the sealing pair is uniform, and the sealing performance is good.
Description
Technical Field
The utility model belongs to the valve field especially relates to a knife gate valve.
Background
The knife gate valve is composed of a soft seal knife gate valve and a hard seal knife gate valve according to the sealing form between the flashboard and the valve seat, and the sealing surface of the soft seal knife gate valve is easily abraded and extruded to deform, so that the hard seal knife gate valve is generally adopted under the working condition of granular or fiber media. The existing hard sealing knife gate valve generally comprises a valve body, a valve seat, a gate plate, a valve rod, a support and a transmission mechanism, wherein one side of the gate plate adopts a plane sealing surface to be matched with a metal sealing surface of the valve seat to form a hard sealing pair, the lower part of the other side of the gate plate is provided with a knife-shaped inclined surface, and the knife-shaped inclined surface is matched with a wedge block at the bottom of a channel of the valve body to compress the plane sealing surface of the gate plate to. The main disadvantages are: packing is adopted between the flashboard and the valve body for sealing, the sealing area is large, and leakage is easy to occur through repeated opening and closing friction of the flashboard; the gate plate is wedged tightly by the knife-shaped inclined plane and the wedge block at the bottom of the valve body and is in sealing fit with the valve seat, so that the sealing specific pressure of the circumference of the sealing pair of the gate plate and the valve seat is inconsistent, the sealing performance is influenced, and the knife-shaped inclined plane and the wedge block of the gate plate are abraded in the repeated use process, so that the wedging force between the gate plate and the valve seat is reduced, and the sealing performance is reduced.
Disclosure of Invention
The utility model discloses shortcoming to prior art exists provides a sealed vice circumference seals even, the tight power of sealed wedge is big, the good hard seal of sealing performance is zero to leak and has valve lid sword type gate valve.
The technical scheme of the utility model includes the valve body, the flashboard, the valve rod, the valve gap, a support, drive mechanism, the system has the plane seal disk seat that mutually supports with the plane seal face of flashboard import side in the valve body inlet channel, the valve gap lower extreme passes through bolt fixed mounting in the valve body upper end, set up sealed pad between the installation face of both, be equipped with sealed chamber between valve gap upper end and the outer disc of valve rod, install sealed filler in this sealed chamber, constitute confined flashboard chamber between valve gap and valve body, the support fixed mounting is in the valve gap upper end, flashboard upper end and valve rod lower extreme fixed connection, the valve rod upper end is connected with the drive mechanism of fixed mounting on the support; the method is characterized in that: the plane sealing valve seat at the inlet side of the valve body is in hard sealing fit with the plane sealing surface at the inlet side of the flashboard by adopting a mirror surface; and a movable metal sealing seat with a wedge-shaped sealing ring is arranged in the outlet channel of the valve body, and the outlet side of the flashboard is provided with a wedge-shaped sealing surface matched with the wedge-shaped sealing ring of the movable metal sealing seat.
Preferably, the movable metal sealing seat comprises a metal sealing ring, one side of the contact surface of the metal sealing ring and the gate plate is a wedge-shaped sealing ring, the other side of the contact surface of the metal sealing ring and the gate plate is provided with a radial annular convex shoulder, a radial inner step is arranged in the outlet channel of the valve body, and the radial annular convex shoulder of the metal sealing ring is fixedly arranged on the radial inner step through screws.
Preferably, an annular disc spring is mounted between the contact surfaces of the radial annular shoulder of the metal seal ring and the radially inner step in the valve body passage.
Preferably, the transmission mechanism is a bevel gear transmission.
Compared with the prior art, the utility model beneficial effect be: the middle cavity is sealed by adopting the packing between the outer circular surface of the valve rod and the packing cavity of the valve cover, the sealing area is small, and the sealing performance of the middle cavity is reliable; a mirror surface hard sealing structure is adopted between the plane sealing surface of the flashboard and the plane sealing valve seat, the circumferential sealing specific pressure of the sealing pair is uniform, the sealing wedging force is large, and the sealing performance is good; the movable metal sealing seat is installed in the valve body channel through an annular disc spring, has an automatic compensation effect on expansion and contraction caused by abrasion of a sealing pair and temperature change, keeps the reliability of sealing, and realizes zero leakage closing.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The hard sealing zero leakage knife gate valve with the valve cover as shown in figure 1 comprises a valve body 1, a gate plate 3, a valve rod 9, a valve cover 6, a support 10 and a transmission mechanism 11, wherein a plane sealing valve seat matched with a plane sealing surface at the inlet side of the gate plate 3 is arranged in an inlet channel of the valve body 1, the lower end of the valve cover 6 is fixedly arranged at the upper end of the valve body 1 through bolts, a sealing gasket 5 is arranged between the mounting surfaces of the valve body and the valve cover, a sealing cavity is arranged between the upper end of the valve cover 6 and the outer circular surface of the valve rod 9, a sealing filler 7 is arranged in the sealing cavity, the sealing filler 7 is arranged in the sealing cavity through a filler gland 8, a closed gate plate cavity is formed between the valve cover 6 and the valve body 1, the gate plate 3 enters the gate plate cavity when opened, the sealing performance of the middle cavity is improved, the support 10 is fixedly arranged at the upper end of the, the rotary motion of the transmission mechanism 11 is converted into the up-and-down linear motion of the valve rod 9 through the conversion mechanism; the method is characterized in that: the plane sealing valve seat at the inlet side of the valve body 1 and the plane sealing surface at the inlet side of the flashboard 3 are matched by adopting mirror surface hard sealing, and the mirror surface sealing surfaces of the valve body 1 and the flashboard 3 are formed by grinding surfacing hard alloy, so that the valve body has wear resistance and scratch resistance; set up the movable metal seal seat 2 that has the wedge sealing ring in 1 exit passage of valve body, 3 outlet sides of flashboard have with the wedge sealing face of the wedge sealing ring of movable metal seal seat 2 mutually supporting, when flashboard 3 was closed, the wedge sealing face was wedged tightly gradually with the wedge sealing ring of movable metal seal seat 2, make the sealed specific pressure of the hard sealed face circumferencial direction of mirror surface between flashboard 3 and the 1 plane seal disk seat of valve body unanimous, improve sealing performance, can realize the sealed cooperation of the hard sealed face of mirror surface zero leakage.
The movable metal sealing seat 2 comprises a metal sealing ring, one side of the contact surface of the metal sealing ring and the flashboard 3 is a wedge-shaped sealing ring, the other side of the contact surface is provided with a radial annular convex shoulder, a radial inner step is arranged in the outlet channel of the valve body 1, and the radial annular convex shoulder of the metal sealing ring is fixedly arranged on the radial inner step through a screw 4. The bottom of the metal sealing ring is provided with an axial slag discharge port to prevent impurities from being deposited in the groove. The axial deslagging port is characterized in that a plurality of axial grooves are formed in the inner annular wall at the bottom of the metal sealing ring, and impurities in the grooves are flushed out from the axial grooves by medium flow before the flashboard 3 is closed in place.
An annular disc spring is arranged between the contact surfaces of the radial annular convex shoulder of the metal sealing ring and the radial inner step in the channel of the valve body 1, the elastic force of the annular disc spring is utilized to automatically compensate the thermal expansion and cold contraction generated by the abrasion of the sealing pair and the temperature change, and the sealing reliability is improved.
The transmission mechanism 11 adopts a bevel gear transmission device to reduce the opening moment.
Claims (4)
1. A hard seal zero leakage gate valve with a valve cover knife comprises a valve body (1), a gate plate (3), a valve rod (9), a valve cover (6), a support (10) and a transmission mechanism (11), wherein a plane seal valve seat matched with a plane seal surface at the inlet side of the gate plate (3) is manufactured in an inlet channel of the valve body (1), the lower end of the valve cover (6) is fixedly arranged at the upper end of the valve body (1), a seal cavity is arranged between the upper end of the valve cover (6) and the outer circular surface of the valve rod (9), a seal filler (7) is arranged in the seal cavity, a closed gate plate cavity is formed between the valve cover (6) and the valve body (1), the support (10) is fixedly arranged at the upper end of the valve cover (6), the upper end of the gate plate (3) is fixedly connected with the lower end of the valve rod (9), and the upper end; the method is characterized in that: the plane sealing valve seat at the inlet side of the valve body (1) is in hard sealing fit with the plane sealing surface at the inlet side of the flashboard (3) by adopting a mirror surface; a movable metal sealing seat (2) with a wedge-shaped sealing ring is arranged in an outlet channel of the valve body (1), and a wedge-shaped sealing surface matched with the wedge-shaped sealing ring of the movable metal sealing seat (2) is arranged on the outlet side of the flashboard (3).
2. A hard sealing zero leakage gate valve with a valve cover and a knife type gate valve according to claim 1, characterized in that the movable metal sealing seat (2) comprises a metal sealing ring, the contact surface of the metal sealing ring and the gate plate (3) is a wedge-shaped sealing ring on one side, the other side is provided with a radial annular shoulder, a radial inner step is arranged in the outlet channel of the valve body (1), and the radial annular shoulder of the metal sealing ring is fixedly arranged on the radial inner step through a screw (4).
3. A hard sealing zero leakage gate valve with a valve cover and a knife type gate valve according to claim 2, characterized in that an annular disc spring is arranged between the contact surfaces of the radial annular shoulder of the metal sealing ring and the radial inner step in the channel of the valve body (1).
4. A hard seal zero leakage bonnet knife gate valve as claimed in claim 1 or 2 or 3, wherein the drive means (11) is a bevel gear drive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921277449.7U CN210661421U (en) | 2019-08-08 | 2019-08-08 | Hard-sealing zero-leakage knife gate valve with valve cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921277449.7U CN210661421U (en) | 2019-08-08 | 2019-08-08 | Hard-sealing zero-leakage knife gate valve with valve cover |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210661421U true CN210661421U (en) | 2020-06-02 |
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ID=70817504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921277449.7U Active CN210661421U (en) | 2019-08-08 | 2019-08-08 | Hard-sealing zero-leakage knife gate valve with valve cover |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210661421U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114135697A (en) * | 2021-12-03 | 2022-03-04 | 浙江新博阀门有限公司 | Multi-cutter gate valve |
-
2019
- 2019-08-08 CN CN201921277449.7U patent/CN210661421U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114135697A (en) * | 2021-12-03 | 2022-03-04 | 浙江新博阀门有限公司 | Multi-cutter gate valve |
| CN114135697B (en) * | 2021-12-03 | 2024-03-26 | 浙江新博阀门有限公司 | Multi-pass knife gate valve |
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