CN219888853U - Pilot-operated overflow valve - Google Patents
Pilot-operated overflow valve Download PDFInfo
- Publication number
- CN219888853U CN219888853U CN202221361346.0U CN202221361346U CN219888853U CN 219888853 U CN219888853 U CN 219888853U CN 202221361346 U CN202221361346 U CN 202221361346U CN 219888853 U CN219888853 U CN 219888853U
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- CN
- China
- Prior art keywords
- pilot
- valve
- main valve
- sleeve
- adjusting bolt
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- 238000007789 sealing Methods 0.000 claims abstract description 30
- 238000007730 finishing process Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 240000007263 Pinus koraiensis Species 0.000 description 2
- 235000011615 Pinus koraiensis Nutrition 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- ZPEZUAAEBBHXBT-WCCKRBBISA-N (2s)-2-amino-3-methylbutanoic acid;2-amino-3-methylbutanoic acid Chemical compound CC(C)C(N)C(O)=O.CC(C)[C@H](N)C(O)=O ZPEZUAAEBBHXBT-WCCKRBBISA-N 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Safety Valves (AREA)
Abstract
The utility model discloses a pilot overflow valve, and relates to the field of hydraulic valves. The pilot relief valve includes a main valve portion and a pilot valve portion. The main valve portion includes a valve body, a main valve spool, and a main valve sleeve. The pilot valve part comprises a pilot valve sleeve, a pilot ball valve, a pressure adjusting bolt lock nut and a pressure adjusting bolt sealing ring. The matched contact surface of the main valve core and the inner hole of the main valve sleeve omits a set of sealing ring, so that the sliding resistance of the main valve core is effectively reduced, and the opening and closing characteristics of the pilot overflow valve are good. The pilot valve part uses the pilot ball valve seat to embed the pilot ball valve to replace the needle valve proposal of the PC50 overflow valve, thereby reducing the processing difficulty and relieving the problem of higher inner seepage caused by the large processing difficulty and poor precision.
Description
Technical Field
The utility model relates to the field of hydraulic valves, in particular to a pilot overflow valve.
Background
The Pilot relief valve (English translation: pilot-operated Pressure Relief Valv) acts on the pressure measuring surfaces of the main valve core and the Pilot valve core and is composed of a Pilot pressure regulating part and a main valve part. The pilot pressure regulating part is used for controlling the overflow pressure of the main valve. The main valve portion is used for overflow. The pilot relief valve has a variety of configurations.
The PC50 overflow valve of pinus koraiensis will be described as an example. The PC50 overflow valve has the problems of poor opening and closing characteristics, namely large opening and closing pressure difference, due to the structural limitation of the PC50 overflow valve; problems with lower maximum pressure; the poor processability is that the tolerance chain is too long, and particularly the processing difficulty of the pilot needle valve is large and the precision is not well ensured, so that the problem of high internal leakage is caused.
Therefore, there is a need to develop a pilot relief valve.
Disclosure of Invention
The present utility model aims to overcome or at least partially solve or alleviate the above-mentioned problems.
The utility model provides a pilot-operated relief valve, comprising:
a main valve portion comprising, from outside to inside:
the valve body is provided with a valve body,
the main valve sleeve is inserted into the valve body, and a main valve sleeve spring is arranged on the main valve sleeve to push the main valve sleeve to be tightly attached to the valve body;
the main valve core is pushed to be inserted into the main valve sleeve together through a main valve core spring arranged on the main valve core;
a pilot valve portion coupled to the main valve portion, comprising:
a pilot valve sleeve, on which a main valve sleeve sealing ring is installed near the main valve to seal the pilot valve sleeve and the main valve sleeve, a pilot valve sleeve sealing ring is installed in the pilot valve sleeve to seal the pilot valve sleeve and the valve body,
the pilot ball valve is embedded at the end part of the pilot ball valve seat and is pressed at the pilot valve sleeve through a pilot spring,
the pressure adjusting bolt is screwed into the pilot valve sleeve through threads and abuts against the pilot spring through a pilot valve spring seat arranged in the pressure adjusting bolt,
a pressure adjusting bolt lock nut which is arranged outside the pressure adjusting bolt through threads so as to lock the pressure adjusting bolt at the end part of the pilot valve sleeve,
and the pressure adjusting bolt sealing ring is arranged on the pressure adjusting bolt to seal the pilot valve sleeve, the pressure adjusting bolt and the pressure adjusting bolt lock nut.
Optionally, the main valve sleeve is provided with a low-pressure oil hole therein, and the low-pressure oil hole is inclined towards the top of the main valve sleeve.
Optionally, the interior of the pilot valve sleeve has a ball valve sealing annulus to mate with the pilot ball valve.
Optionally, a pit is formed at an inner hole of the pressure adjusting bolt so as to mount the pilot valve spring seat.
A pilot-operated relief valve of the present utility model includes a main valve portion and a pilot valve portion. The main valve portion includes a valve body, a main valve spool, and a main valve sleeve. The pilot valve part comprises a pilot valve sleeve, a pilot ball valve, a pressure adjusting bolt lock nut and a pressure adjusting bolt sealing ring. The matched contact surface of the main valve core and the inner hole of the main valve sleeve omits a set of sealing ring, so that the sliding resistance of the main valve core is effectively reduced, and the opening and closing characteristics of the pilot overflow valve are good. The pilot valve part uses a pilot ball valve seat to embed a pilot ball valve to replace a needle valve scheme of a PC50 overflow valve, so that the processing difficulty is reduced, and the problem of higher inner seepage caused by high processing difficulty and poor precision is solved.
The above, as well as additional objectives, advantages, and features of the present utility model will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present utility model when read in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the utility model will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:
fig. 1 is a schematic cross-sectional view of a pilot operated relief valve according to an embodiment of the present utility model.
The symbols in the drawings are as follows:
a main valve sleeve 1, a main valve core 2, a valve body 3, a main valve core spring 4, a main valve sleeve sealing ring 5, a pilot ball valve 6, a main valve sleeve spring 7, a pilot ball valve seat 8, a pilot valve sleeve 9, a pilot valve sleeve sealing ring 10, a pilot valve spring 11, a pressure adjusting bolt sealing ring 12, a pressure adjusting bolt locking nut 13, a pilot valve spring seat 14 and a pressure adjusting bolt 15,
101 a low-pressure oil hole, 102 a ball valve sealing ring belt and 103 pits.
Detailed Description
Fig. 1 is a schematic cross-sectional view of a pilot operated relief valve according to an embodiment of the present utility model. The present embodiment provides a pilot-operated relief valve that may generally include a main valve portion and a pilot valve portion. The main valve portion generally includes a main valve housing 1, a main valve spool 2, a valve body 3, a main valve spool spring 4, a main valve housing seal ring 5, and a main valve housing spring 7. The pilot valve portion generally includes a pilot ball valve 6, a pilot ball valve seat 8, a pilot valve sleeve 9, a pilot valve sleeve seal ring 10, a pilot valve spring 11, a pressure adjustment bolt seal ring 12, a pressure adjustment bolt lock nut 13, a pilot valve spring seat 14, and a pressure adjustment bolt 15. Wherein, the sealing ring groove at the left end of the pilot valve sleeve 9 is internally provided with a main valve sleeve sealing ring 5 to seal the pilot valve sleeve 9 and the main valve sleeve 1. The main valve core 2 is pushed by the main valve core spring 4 to be inserted into the main valve sleeve 1 together, and is inserted into the main valve body 3 through the main valve sleeve 1 together. The main valve sleeve spring 7 pushes the main valve sleeve 1 against the left side of the valve body 3. The pilot valve sleeve 9 and the valve body 3 are sealed by a pilot valve sleeve sealing ring 10. The pilot ball valve 6 is embedded at the left end of the pilot ball valve seat 8, and is pressed on one side of a ball valve sealing ring belt 102 in the pilot valve sleeve 9 by a pilot valve spring 11. The pressure adjusting bolt 15 is screwed into the internal thread at the right end of the pilot valve sleeve 9, and abuts against the pilot valve spring seat 14 arranged at the right side of the pilot valve spring 11 by utilizing the concave pit 103 of the inner hole. The external thread on the right side of the pressure adjusting bolt 15 is provided with a pressure adjusting bolt lock nut 13, and the pressure adjusting bolt lock nut 13 locks the pressure adjusting bolt 15 at the right end of the pilot valve sleeve 9. The pressure adjusting bolt lock nut 13, the pressure adjusting bolt 15 and the pilot valve sleeve 9 are sealed by a pressure adjusting bolt sealing ring 12.
The left and right in this embodiment are defined with reference to the view seen by the reader.
The working principle of the pilot type overflow valve is not different from that of the PC50 overflow valve of the Pinus koraiensis, so that the working principle of the pilot type overflow valve is not repeated. The utility model is characterized in that:
1) In the utility model, a set of sealing rings is omitted on the matched contact surface of the main valve core 2 and the inner hole of the main valve sleeve 1, and the main effect of the scheme is to effectively reduce the sliding resistance of the main valve core 2, not to save the cost. In the working process, the set of sealing rings generates an extra pressure on the hole wall of the main valve sleeve 1 under the pressure deformation state, so that the process of sliding the main valve core 2 rightwards away from the sealing ring belt of the main valve sleeve 1 forms a corresponding friction force, the friction force relatively raises the opening pressure of the overflow valve, the sealing rings still keep the pressure state while the main valve core 2 keeps the opening pressure, and the friction force is overcome when the main valve core 2 needs to move leftwards to contact the sealing ring belt of the main valve sleeve 1 to enter the closing state of the overflow valve, and the friction force only enables the oil pressure to be further reduced and then the main valve core spring 4 can push the main valve core 2 to move leftwards, so that the opening and closing characteristics of the pilot overflow valve are influenced.
2) In the utility model, the radial low-pressure oil hole 102 at the left end of the main valve sleeve 1 inclines to the top by an angle and changes a round hole into an elliptical hole, so that the wall thickness is increased while the drift diameter is ensured, and the structural strength is increased, so that the deformation of the top of the main valve sleeve 1 under pressure is reduced, and the sealing ring belt contacted with the main valve core 2 and the main valve sleeve 1 in a high-pressure state cannot lose precision due to the deformation of the main valve sleeve 1 under pressure, so that the highest pressure of the pilot overflow valve is correspondingly improved.
3) In the utility model, the pilot ball valve seat 8 is embedded with the pilot ball valve 6 to replace the traditional needle valve technical scheme, so that the processing difficulty of the two parts is low, and the processing difficulty of all components of the pilot valve is reduced. The sphere has the characteristic of neutral balance, and the surface contour precision of the sphere is ensured without being influenced by angle errors. In order to ensure the sealing precision of the needle valve sealing ring belt of the PC50 overflow valve of the Japanese small pine, the needle valve rod needs to be positioned by an inner hole of a pressure adjusting bolt, so that the shape and position precision of an inner thread and a right end face of a pilot valve sleeve and the needle valve sealing ring belt can be ensured in the finishing process after heat treatment, the shape and position precision of two outer threads and the inner hole of the pressure adjusting bolt needs to be ensured in the finishing process after heat treatment, and the shape and position precision of the inner thread and the left end face of a pressure adjusting bolt lock nut needs to be ensured in the finishing process after heat treatment. Therefore, the prior art has poor processability, namely, the problem of higher internal leakage amount caused by too long tolerance chain.
It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this utility model belongs.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. In the description of the present utility model, the meaning of "plurality" is two or more unless specifically defined otherwise.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.
Claims (4)
1. A pilot operated relief valve, comprising:
a main valve portion comprising, from outside to inside:
the valve body is provided with a valve body,
the main valve sleeve is inserted into the valve body, and a main valve sleeve spring is arranged on the main valve sleeve to push the main valve sleeve to be tightly attached to the valve body;
the main valve core is pushed to be inserted into the main valve sleeve together through a main valve core spring arranged on the main valve core;
a pilot valve portion coupled to the main valve portion, comprising:
a pilot valve sleeve, on which a main valve sleeve sealing ring is installed near the main valve to seal the pilot valve sleeve and the main valve sleeve, a pilot valve sleeve sealing ring is installed in the pilot valve sleeve to seal the pilot valve sleeve and the valve body,
the pilot ball valve is embedded at the end part of the pilot ball valve seat and is pressed at the pilot valve sleeve through a pilot spring,
the pressure adjusting bolt is screwed into the pilot valve sleeve through threads and abuts against the pilot spring through a pilot valve spring seat arranged in the pressure adjusting bolt,
a pressure adjusting bolt lock nut which is arranged outside the pressure adjusting bolt through threads so as to lock the pressure adjusting bolt at the end part of the pilot valve sleeve,
and the pressure adjusting bolt sealing ring is arranged on the pressure adjusting bolt to seal the pilot valve sleeve, the pressure adjusting bolt and the pressure adjusting bolt lock nut.
2. The pilot operated relief valve of claim 1, wherein the main valve housing has a low pressure oil hole therein, the low pressure oil hole being inclined toward a top thereof.
3. The pilot relief valve of claim 1, wherein the pilot valve sleeve has a ball valve sealing annulus inside to mate with the pilot ball valve.
4. The pilot operated relief valve of any of claims 1-3, wherein the pressure adjustment bolt has a recess at an inner bore to mount the pilot valve spring seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221361346.0U CN219888853U (en) | 2022-06-01 | 2022-06-01 | Pilot-operated overflow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221361346.0U CN219888853U (en) | 2022-06-01 | 2022-06-01 | Pilot-operated overflow valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219888853U true CN219888853U (en) | 2023-10-24 |
Family
ID=88410608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221361346.0U Active CN219888853U (en) | 2022-06-01 | 2022-06-01 | Pilot-operated overflow valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219888853U (en) |
-
2022
- 2022-06-01 CN CN202221361346.0U patent/CN219888853U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |