CN212717993U - Anti-scouring angle type stop valve - Google Patents

Abstract

The utility model provides an scour prevention angle formula stop valve belongs to the stop valve field, the utility model discloses set up overflow buffer protection district on valve body and the sealed complex sealed face of valve clack promptly and form two step structure in this department to be close to valve rod one side and be the upper step, the upper step wall, be down the step face otherwise, the lower step wall, the sealed face of valve clack includes an axial plane, sealing contact surface and is located the transition face that is used for connecting axial plane and sealing contact surface between the two, axial plane and upper step wall clearance fit or zero clearance fit when valve clack and the sealed face of valve body are sealed, sealing contact surface and the juncture zero clearance fit of lower step face and lower step wall. The utility model discloses utilize and overflow the optimization of buffer protection district and solved the sealed face that conventional high pressure ends and resistant the problem that the scouring performance is poor, the valve life is short, guarantee the valve and equip the safe operation of facility.

Description

Anti-scouring angle type stop valve

Technical Field

The utility model relates to a stop valve field concretely relates to angle formula stop valve of sealed face scour prevention.

Background

The stop valve, also called stop valve, is a widely used valve, and the closing principle of the stop valve is that the sealing surface of the valve clack is tightly attached to the sealing surface of the valve seat by the pressure of a valve lever to prevent the medium from flowing. Because the friction force between the sealing surfaces is small in the opening and closing process, the valve is durable and high, and meanwhile, because the valve is not large in opening height, easy to manufacture and convenient to maintain, the valve is not suitable for medium and low pressure and high pressure.

The angle stop valve opening and closing piece is a plug-shaped valve clack, the sealing surface is a plane or a conical surface, and the valve clack moves linearly along the center line of fluid. The utility model discloses a serious accident release stop valve as chinese utility model application patent number is CN201820581654.1, including valve body, disk seat, valve rod, valve clack, dish spring group and support, set up the sealing ring between gland box and the valve body, the sealing ring sets up the below at the four-ring opening, the sealing ring includes graphite ring, lower graphite ring, goes up becket and lower becket, and circle and last becket excircle clearance fit in the becket down, go up becket and set up graphite ring down with one side that is close to the gland box between the becket down, go up becket and set up graphite ring with one side that is close to the valve body down between the becket. The utility model discloses can guarantee the discharge ability of valve under the serious accident to under the operating mode that changes rapidly, the valve can be opened and play sealed effect to valve body and gland packing.

At present high pressure self sealss angle formula stop valve ubiquitous problem that life cycle is short, as above, the sealed face of current valve clack is mostly plane or cambered surface, and when it carries out sealed cooperation with the valve body seal face of the medium runner of valve body, as shown in figure 1, the sealed face of valve clack can be washed away to the medium that passes through in the gap under the state of opening a little, has accelerated the damaged speed of the sealed face of valve clack, and then appears leaking even sealed inefficacy, reduces the life of valve. The high-pressure medium is easy to leak, fall off, lose efficacy and the like under the flushing, so that the durability of the valve is greatly reduced.

Based on this, the present application is proposed.

Disclosure of Invention

In order to solve the problem, the utility model provides a sealed angular stop valve of face scour protection, it can avoid the valve clack to receive the medium under the state of opening a little to erode and the damaged condition appearance is accelerated, also avoids consequently easily leaking or inefficacy in the sealed cooperation between valve clack and the valve body to provide the life of valve.

In order to achieve the above object, the utility model discloses scour prevention angle formula stop valve, including valve body, valve rod, valve clack, have the passageway that supplies the medium to get into, flow on the valve body, the valve clack is followed the valve rod and is in thereby axial displacement on the axle center of passageway, with the sealed face clearance fit of valve body of passageway inside seals or opens. The sealing surface of the valve body is in a double-step shape, the step wall of the valve body is axially parallel to the channel, and one side close to the valve rod is an upper step, otherwise, the side is a lower step. The bottom of the valve clack is provided with a valve clack sealing surface matched with the valve body sealing surface, and the valve clack sealing surface comprises an axial plane, a sealing contact surface and a transition surface positioned between the axial plane and the sealing contact surface and used for connecting the axial plane and the sealing contact surface. When the valve clack is sealed with the sealing surface of the valve body, the axial plane is in clearance fit or clearance-free fit with the step wall of the upper step, and the sealing contact surface is in clearance-free fit with the step angle of the lower step. The transition surface is disposed obliquely with respect to the axial plane.

The utility model discloses an above-mentioned structure has changed the seal structure between the valve clack and the medium channel of angle stop valve among the prior art, change through seal structure makes above-mentioned seal structure restrict the flow of medium under the condition of opening a little (just opening the valve or closing the state of valve promptly, the sealed face of valve clack and the sealed face of valve body between the distance less) to prevented effectively that the valve clack from being washed away by the medium under the state of opening a little and easily damaged leading to leaking or sealed condition of inefficacy appears, the durability and the life of valve are provided.

The utility model discloses further set up as follows: the transition surface is parallel to the medium and is arranged in the radial direction, the structure is convenient to process, and the flow limiting effect of the sealing structure on the medium in a micro-opening state is further improved.

For providing the sealed effect between sealed contact surface and the lower step to adapt to the sealing under the different pressure, the utility model discloses further set up as follows: the sealing contact surface and the lower surface of the valve clack form a spherical surface with an arc-shaped cross section. In addition, the spherical surface has smaller opening and closing amplitude and smaller friction compared with a plane.

For ensuring the utility model provides a seal structure is to the medium current-limiting effect under the state of opening a little, the utility model discloses further set up as follows: the width of the step surface of the lower step is at least 0.5 mm.

For ensuring the utility model provides a seal structure has certain leakproofness when playing the current-limiting effect to the medium under opening the state a little, the utility model discloses further set up as follows: the width of the step surface of the lower step does not exceed 1/10 of the diameter of the sealing surface of the valve body.

For providing sealing performance, the utility model discloses further set up as follows: and a valve cover is arranged between the valve rod and the valve body, the valve cover is in sliding fit with the valve rod, and a packing structure which is formed by sequentially combining a metal braided graphite ring, a high-density graphite ring and a low-density graphite ring is arranged between the valve cover and the valve rod.

The above-described filler structure is preferably as follows: the low-density graphite ring is a winding braided graphite ring, is embedded between at least two relatively high-density graphite rings, is provided with at least two metal braided graphite rings, is oppositely arranged and is embedded on the peripheral walls of the two high-density graphite rings, and forms an outer hard and inner soft sealing buffer structure through the layer-by-layer nested combination of the low-density graphite, the high-density graphite and the metal braided graphite, so that the structure is simplified, the sealing effect between the valve cover and the valve rod is ensured by utilizing the outer hard and inner soft characteristics, and the valve rod and the valve cover can adapt to small displacement (generally less than 2 mm) existing between the valve rod and the valve cover in the using process.

For strengthening the sealing, the utility model discloses further set up as follows: the packing structure is characterized by further comprising a pressing sleeve and a pressing plate, the pressing sleeve is pressed by the pressing plate to enable the pressing sleeve to act on the packing structure, and the pressing plate is fixedly connected with the valve cover through a disc spring and a nut. The packing structure provides a low-leakage structure with simple structure and extremely excellent effect for the stop valve, the leakage rate of the packing structure is less than or equal to 50ppm under the loading pressure of the packing pressing plate and the disc spring, and the leakage caused by the pressure fluctuation at the packing position is prevented, so that the whole sealing property and the whole reliability of the valve are improved.

The utility model discloses further set up as follows: a pressure self-sealing structure is adopted between the valve cover and the valve body, and the pressure self-sealing structure comprises a metal edge-wrapped woven graphite ring with a wedge shape. When the valve cover is pushed to press the metal wrapping woven graphite, the metal wrapping woven graphite can be extruded to generate elastic deformation to form sealing between the valve bodies, and the sealing structure has the advantage that the sealing performance is better when the pressure is higher, so that the valve cover can be more suitable for being used under the harsh high-pressure condition.

The utility model discloses further set up as follows: the hard alloy is integrally built on the valve body inner cavity, the channel inner wall and the valve clack in a build-up welding mode, so that the high-pressure medium is prevented from scouring the base material, and the service life of the valve is further prolonged.

The utility model discloses technical effect as follows:

one, the utility model discloses the sealed face of valve body provides one scour prevention structure through two step structural design for opening and closing of valve for the flow that high pressure overflows the medium among the switching process receives the restriction and is difficult to or can't flow through the lid structure under the state of opening a little, the event has prevented effectively that high-pressure medium from directly scouring the sealed face of valve body, avoid the valve body, the sealed vice high-pressure medium of valve clack from appearing leaking under scouring, drop, circumstances such as inefficacy, the sealed face of valve body and the sealed face of valve clack have been protected effectively, valve life is prolonged.

Secondly, this new and new practical has further combined pressure self-sealing structure, low leakage structure to improve the valve prevent leaking, prevent the effect of random flow, make the valve sealing performance better under the higher circumstances of pressure to ensure its reliability, stability and life who uses under the harsh environment of high pressure.

Drawings

Fig. 1 is a schematic diagram of medium flow in a slightly opened state of a conventional stop valve.

Fig. 2 is a schematic view of the whole embodiment 1 of the present invention.

Fig. 3 is a schematic view of a low leakage structure according to embodiment 1 of the present invention.

Fig. 4 is a schematic view of a valve closed state according to embodiment 1 of the present invention.

Fig. 5 is a schematic view of a valve micro-opening state-stage 1 according to embodiment 1 of the present invention.

Fig. 6 is a schematic view of a valve micro-opening state-stage 2 according to embodiment 1 of the present invention.

Fig. 7 is a schematic view of the valve opening state according to embodiment 1 of the present invention.

Reference numerals:

1-valve body, 2-valve clack, 3-valve rod, 4-valve cover, 5-packing group, 6-pressing plate, 7-handwheel, 8-pressing sleeve, 9-self-pressing sealing ring, 101-inlet channel, 102-outlet channel, 103-valve cavity, 110-upper step, 120-upper step wall, 130-step angle, 210-axial plane, 220-transition surface, 230-sealing contact surface, 510-woven graphite, 520-high-density graphite, 530-low-density graphite, 610-stud, 620-disc spring.

Detailed Description

Embodiment 1 is as shown in fig. 2, the angle anti-scouring angle type stop valve, it includes valve block 1, valve flap 2, valve stem 3, valve cover 4, hand wheel 7, there are valve cavity 103 and inlet 101 and outlet 102 that link up with the valve cavity 103 in the valve block 1, the inlet 101 is perpendicular to and communicates with outlet 102 each other, in this embodiment, the inlet 101 is in the lower, the outlet 102 is on the upper, have formed the liquid inlet, liquid outlet passage that the lower enters and goes out, prevent the packing from pressing the filler leakage that causes in the long-term shut-off of the valve. In addition, the upper section of the inlet passage 101 is coaxially arranged with the valve cavity 103 and directly communicated with the valve cavity 103. Valve rod 3 is located the middle of valve body 1, and 3 lower extremes of valve rod are connected in valve clack 2 upper ends, and valve gap 4 is located between valve rod 3 and the valve body 1, and valve gap 4 overlaps the middle part of valve rod 3 and is in the same place with 1 fixed connection of valve body, is sliding fit between valve gap 4 and the valve rod 3. The whole-course guide of the valve clack 2 and the valve body 1 avoids the shaking caused by medium scouring in the opening and closing process of the valve clack 2. The hand wheel 7 is arranged at the upper end of the valve rod 3, the hand wheel 7 can be an impact hand wheel 7, and the hand wheel 7 is fixed at the upper end of the valve rod 3 through connecting pieces such as nuts and the like. The lower part of the valve clack 2 is movably matched with the position of a valve port of the inlet channel 101, namely the position of a sealing surface of the valve body 1, so that the valve port is opened or closed, and the function of the valve is realized.

As shown in fig. 2 and 3, a packing structure for limiting the specific position of the valve rod 3 in the valve cap 4 by filling the gap between the valve rod 3 and the valve cap 4 is installed between the valve cap 4 and the valve body 1. Packing structure top is pressure cover 8, clamp plate 6, and clamp plate 6 presses cover 8 below and makes pressure cover 8 compress tightly packing structure downwards, and then makes the deformation of packing structure carry out the effect of packing, and clamp plate 6 is in the same place through bolt, dish spring 620 and nut fixed connection with valve gap 4.

As shown in fig. 3, the packing structure of the present embodiment includes two rings of metal braided graphite 510, two rings of high density graphite 520, and two rings of low density graphite 530: the low-density graphite 530 ring adopts a winding graphite ring, the winding graphite ring has at least three circles, the low-density graphite 530 ring is embedded between two oppositely-arranged high-density graphite 520 rings, and meanwhile, the outer peripheral wall of the low-density graphite 530 ring is tightly attached to and in contact fit with the inner peripheral wall of the high-density graphite 520 ring. And the two rings of woven metal graphite 510 are likewise positioned opposite one another and nested around the outer peripheral walls of the two rings of high density graphite 520.

The disc spring 620 is matched with the packing structure, so that the sealing effect can be ensured, the sealing of the packing part of the valve rod 3 can be ensured when pressure fluctuation exists at the packing part, the leakage rate is less than or equal to 50ppm under the loading pressure of the packing pressing plate 6 and the disc spring 620, and the leakage caused by the pressure fluctuation at the packing part is effectively prevented.

As shown in fig. 4, the lower portion of the valve flap 2 in this embodiment is approximately hemispherical, and a sealing surface of the valve flap 2 is provided thereon. On one hand, compared with a flat opening and closing range, the spherical surface has smaller opening and closing amplitude and smaller friction, so that the spherical surface is more suitable for stopping use; on the other hand, the valve clack 2 adopts an arc regulation type structure, medium overflowing linearity in the opening and closing process can provide the passing performance of the medium, and is beneficial to preventing the generation of turbulent flow, thereby providing the reliability of the valve. And overlaying the STL hard alloy material.

Referring to fig. 4, 5, 6, and 7, the sealing surface of the valve body 1 is a double step shape, the step wall of which is axially parallel to the passage, and the side close to the valve stem 3 is an upper step 110, whereas the side is a lower step. The bottom of the valve clack 2 is provided with a valve clack 2 sealing surface matched with the valve body 1 sealing surface, the valve clack 2 sealing surface comprises an axial plane 210, a sealing contact surface 230 and a transition surface 220 positioned between the axial plane 210 and the sealing contact surface 230, the axial plane 210 is in clearance fit or clearance-free fit with the upper step wall 120 of the upper step 110 when the valve clack 2 is sealed with the valve body 1 sealing surface, and the sealing contact surface 230 is in clearance-free fit with the step angle 130 of the lower step.

As shown in fig. 4 and 5, the anti-erosion structure forms an overcurrent buffering protection area in a micro-start state, when the valve flap 2 is in a micro-start state, the sealing contact surface 230 of the valve flap 2 is separated from the sealing contact surface 230 of the valve body 1 (i.e., the step angle 130 of the lower step), but the throttling contact surface (i.e., the axial plane 210) of the valve flap 2 and the throttling contact surface (i.e., the step wall of the upper step 110) of the valve body 1 are still in a gapless or clearance fit state, and at this time, the medium does not overflow. The valve clack 2 is continuously opened, when the throttling contact surface (namely the axial plane 210) of the valve clack 2 is separated from the throttling contact surface (namely the step wall of the upper step 110) of the valve body 1, the flow area of the sealing surface of the valve clack 2 on the sealing surface of the valve body 1 is far larger than that of the throttling surface, the medium flow rate of the sealing surface of the valve clack 2 on the sealing surface of the valve body 1 is low, the medium flow rate of the throttling surface is high, the scouring of the medium on the sealing surface is effectively transferred to the throttling position, the sealing surface is protected from the medium scouring, and the sealing performance of the valve.

In this embodiment, in order to prevent the transition surface 220 from affecting the sealing and flow-limiting functions of the flushing structure, the transition surface 220 is disposed obliquely with respect to the axial plane 210, which is actually an obliquely disposed plane, and directly connects two opposite points of the axial plane 210 and the sealing contact surface 230 for transition. In a preferred embodiment, the width of the lower step surface (the step surface of the lower step) is at least 0.5mm and does not exceed 1/10 which is the diameter of the sealing surface of the valve body 1 at the end, in order to achieve both the sealing effect and the flow restriction effect.

Example 2 this example differs from example 1 in that: the present embodiment positions the transition surface 220 radially parallel to the media. The sealing structure is convenient to process and is beneficial to further improving the flow limiting effect of the sealing structure on the medium in the micro-starting state.

In short, the utility model provides a high pressure self sealss scour prevention angle formula stop valve, it is through scour prevention structure, low structural design that leaks structure, optimizes and has solved a series of problems such as conventional high pressure is revealed to the filler that ends, sealed face scouring resistance can be poor, the medium flow is nonlinear and valve clack 2 switch in-process shakes, guarantees the valve and equips the safe operation of facility.

Claims (10)

1. Scour prevention angle formula stop valve, including valve body, valve rod, valve clack, have the passageway that supplies the medium to get into, flow out on the valve body, its characterized in that: the valve body sealing surface is in a double-step shape, the step wall of the valve body is axially parallel to the channel, one side close to the valve rod is an upper step, otherwise the valve body sealing surface is a lower step, the bottom of the valve clack is provided with a valve clack sealing surface matched with the valve body sealing surface, the valve clack sealing surface comprises an axial plane, a sealing contact surface and a transition surface positioned between the axial plane and the sealing contact surface and used for connecting the axial plane and the sealing contact surface, when the valve clack and the valve body sealing surface are sealed, the axial plane is in clearance fit or clearance-free fit with the step wall of the upper step, and the sealing contact.

2. An anti-scour angle shut-off valve as defined in claim 1, wherein: the transition surface is disposed radially parallel to the media.

3. An anti-scour angle shut-off valve as defined in claim 2, wherein: the sealing contact surface and the lower surface of the valve clack form a spherical surface with an arc-shaped cross section.

4. An anti-scour angle shut-off valve as defined in claim 1, wherein: the width of the step surface of the lower step is at least 0.5 mm.

5. An anti-scour angle shut-off valve as defined in claim 4, wherein: the width of the step surface of the lower step does not exceed 1/10 of the diameter of the sealing surface of the valve body.

6. An anti-scour angle shut-off valve as defined in claim 1, wherein: a valve cover is arranged between the valve rod and the valve body, the valve cover is in sliding fit with the valve rod, and a packing structure formed by combining a metal woven graphite ring, a high-density graphite ring and a low-density graphite ring is arranged between the valve cover and the valve rod.

7. An anti-scour angle shut-off valve as defined in claim 6, wherein: the low-density graphite ring is provided with at least one, is embedded between at least two relative high-density graphite rings, and is provided with at least two metal braided graphite rings which are oppositely arranged and are embedded on the peripheral walls of the two high-density graphite rings.

8. An anti-scour angle shut-off valve as defined in claim 6, wherein: the packing structure is characterized by further comprising a pressing sleeve and a pressing plate, the pressing sleeve is pressed by the pressing plate to enable the pressing sleeve to act on the packing structure, and the pressing plate is fixedly connected with the valve cover through a disc spring and a nut.

9. An anti-scour angle shut-off valve as claimed in any one of claims 6 to 8, wherein: a pressure self-sealing structure is adopted between the valve cover and the valve body, and the pressure self-sealing structure comprises a metal edge-wrapped woven graphite ring with a wedge shape.

10. An anti-scour angle shut-off valve as defined in claim 1, wherein: the hard alloy is integrally surfacing-welded on the inner cavity of the valve body, the inner wall of the channel and the valve clack to prevent the high-pressure medium from scouring the base material.

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