CN202955297U - Threaded pilot-operated overflow valve - Google Patents
Threaded pilot-operated overflow valve Download PDFInfo
- Publication number
- CN202955297U CN202955297U CN 201220538555 CN201220538555U CN202955297U CN 202955297 U CN202955297 U CN 202955297U CN 201220538555 CN201220538555 CN 201220538555 CN 201220538555 U CN201220538555 U CN 201220538555U CN 202955297 U CN202955297 U CN 202955297U
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- left end
- adjustment sleeve
- valve body
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Abstract
The utility model relates to a threaded pilot-operated overflow valve. The threaded pilot-operated overflow valve comprises a valve body, a main valve core, a base and a screw-in sleeve, wherein the valve body is hollow; a high-pressure oil inlet is formed at the left end of the valve body; the base is arranged on the right side of the high-pressure oil inlet and positioned inside the valve body; the main valve core is arranged inside the left side of the base; the screw-in sleeve is arranged on the right side of the base; the left end of the screw-in sleeve is connected with the right end of the main valve core through a first spring; a conical pilot-operated valve core is arranged inside the left side of the screw-in sleeve; a regulating sleeve is arranged inside the screw-in sleeve on the right side of the pilot-operated valve core through threaded connection; a pressurizing piston is arranged inside the regulating sleeve; a second spring is connected between the left end of the pressurizing piston and the right end of the pilot-operated valve core; and a screw-in screw is in threaded connection with the inner part of the right side of the regulating sleeve. The threaded pilot-operated overflow valve is simple in structure, low in failure rate and low in cost. By adoption of a threaded connection pilot-operated structure, requirements on large load change, large impact force, high start frequency and long-time operation in severe environment can be met.
Description
Technical field
The utility model relates to the hydraulic valve field, particularly a kind of thread type pilot operated compound relief valve.
Background technique
Relief valve is a kind of hydraulic pressure control valve, in hydraulic equipment, mainly plays level pressure overflow effect, voltage stabilizing, and system unloaded and safety protection effect, in metering pump throttling regulating system, metering pump provides constant flow rate.When system pressure increases, can make traffic demand reduce.Now relief valve is opened, and makes the unnecessary flow oil sump tank that overflows, assurance relief valve inlet pressure, and pump discharge pressure is constant.
The power of excavation machinery is mainly to carry out transmission by hydraulic system, all need to use relief valve on many routes of its a whole set of hydraulic system, the work under bad environment of excavator, the suffered load variations of hydraulic system is large, impact force is large, open frequency is high, cause the rate of fault of relief valve high, even change relief valve, have a strong impact on the work of excavation machinery.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of thread type pilot operated compound relief valve, simple in structure, adopt the leading type structure be threaded, can meet that load variations is large, impact force is large, open frequency is high and rugged environment under the needs that work long hours, failure rate is low, cost is low.
The utility model solves the technological scheme that its technical problem adopts: a kind of thread type pilot operated compound relief valve is provided, comprise valve body, main valve plug, pedestal and screw-in cover, described valve inner hollow, its left end has the high pressure oil import, its upper end, left side has the oil sump tank connection mouth, the right side of described high pressure oil import, the inside of valve body is equipped with pedestal, the inside, left side of described pedestal is equipped with main valve plug, the right side of described pedestal is equipped with and screws in cover, the left end of described screw-in cover is connected with the right-hand member of main valve plug by the first spring, the inside, left side of described screw-in cover is equipped with conical guide's spool, described screw-in cover is connected with the inner thread of valve body, the screw-in cover inside on described guide's spool right side is threaded connection adjustment sleeve is installed, the internal pressurization piston of described adjustment sleeve, be connected with the second spring between the right-hand member of the left end of described charged piston and guide's spool, the inside, right side of described adjustment sleeve has been threaded connection the screw-in screw, between described screw-in screw and charged piston, by block, be connected.
Have a small through hole in the middle of the inner hollow of described main valve plug and left end, the left end inside of described screw-in cover is equipped with a filter screen, the left end of described filter screen is connected with a filter screen back-up ring, is connected with the 3rd spring between described filter screen back-up ring and left side main valve plug.
The outside of described adjustment sleeve is threaded connection the large locking nut withstood with the right-hand member that screws in cover, and the outside of described screw-in screw is threaded connection the little locking nut that the right-hand member with adjustment sleeve withstands.
Between the left end outside of described screw-in cover and pedestal, O RunddichtringO, PVC＝polyvinyl chloride back-up ring and hole Steel Cable Baffle Ring are installed from left to right successively, between described screw-in cover and valve body, adjustment sleeve and screw-in overlap between, between block and adjustment sleeve, the O RunddichtringO all is installed.
The outside of the right side of described pedestal, screw-in cover is mounted with back-up ring.
Beneficial effect
The utility model relates to a kind of thread type pilot operated compound relief valve, simple in structure, adopts the leading type structure be threaded, can meet that load variations is large, impact force is large, open frequency is high and rugged environment under the needs that work long hours, failure rate is low, cost is low.
The accompanying drawing explanation
Fig. 1 is the structural drawing that partly cuts open of the present utility model.
Embodiment
Below in conjunction with specific embodiment, further set forth the utility model.Should be understood that these embodiments only are not used in restriction scope of the present utility model for the utility model is described.Should be understood that in addition those skilled in the art can make various changes or modifications the utility model after the content of having read the utility model instruction, these equivalent form of values fall within the application's appended claims limited range equally.
As shown in Figure 1, mode of execution of the present utility model relates to a kind of thread type pilot operated compound relief valve, comprise valve body 25, main valve plug 2, pedestal 1 and screw-in cover 4, described valve body 25 inner hollow, its left end has high pressure oil import 26, its upper end, left side has oil sump tank connection mouth 27, the right side of described high pressure oil import 26, the inside of valve body 25 is equipped with pedestal 1, the inside, left side of described pedestal 1 is equipped with main valve plug 2, the right side of described pedestal 1 is equipped with and screws in cover 4, the left end of described screw-in cover 4 is connected with the right-hand member of main valve plug 2 by the first spring 23, the inside, left side of described screw-in cover 4 is equipped with conical guide's spool 20, described screw-in cover 4 is connected with the inner thread of valve body 25, the screw-in on described guide's spool 20 right sides overlaps 4 inside and is threaded connection adjustment sleeve 12 is installed, the internal pressurization piston 10 of described adjustment sleeve 12, be connected with the second spring 9 between the right-hand member of the left end of described charged piston 10 and guide's spool 20, the inside, right side of described adjustment sleeve 12 has been threaded connection and has screwed in screw 13, between described screw-in screw 13 and charged piston 10, by block 11, be connected.
Have a small through hole 28 in the middle of the inner hollow of described main valve plug 2 and left end, the left end inside of described screw-in cover 4 is equipped with a filter screen 6, the left end of described filter screen 6 is connected with a filter screen back-up ring 5, be connected with the 3rd spring 3 between described filter screen back-up ring 5 and left side main valve plug 2, the outside of described adjustment sleeve 12 is threaded connection the large locking nut 15 withstood with the right-hand member that screws in cover 4, the outside of described screw-in screw 13 is threaded connection the little locking nut 14 that the right-hand member with adjustment sleeve 12 withstands, between the left end outside of described screw-in cover 4 and pedestal 1, O RunddichtringO 22 is installed from left to right successively, PVC＝polyvinyl chloride back-up ring 21 and Steel Cable Baffle Ring 7 for hole, between described screw-in cover 4 and valve body 25, between adjustment sleeve 12 and screw-in cover 4, between block 11 and adjustment sleeve 12, O RunddichtringO 22 all is installed, the right side of described pedestal 1, the outside that screws in cover 4 is mounted with back-up ring 8.
Embodiment 1
High pressure oil enters valve body 25 from high pressure oil import 26, the pressure of high pressure oil surpasses 325kg/cm2, high pressure oil enters into the position of guide's spool 20, guide's spool 20 is stressed and is pushed open to the right, simultaneously, in the small through hole 28 of high pressure oil main valve plug 2 left ends, enter, the left and right pressure official post main valve plug 2 of main valve plug 2 moves right, high pressure oil just flow back into oil sump tank from the oil sump tank connection mouth 27 of valve body 25 1 sides, the oil pressure of now high pressure oil import 26 reduces, when oil pressure drops to 325kg/cm2 when following, guide's spool 20 restores, there is no fluid in the small through hole 28 of main valve plug 2, main valve plug 2 also resets into original position, now the path between high pressure oil and fuel tank cuts off, the pressure of pump just can remain on certain value like this.
Claims (5)
1. a thread type pilot operated compound relief valve, comprise valve body (25), main valve plug (2), pedestal (1) and screw-in cover (4), it is characterized in that, described valve body (25) inner hollow, its left end has high pressure oil import (26), its upper end, left side has oil sump tank connection mouth (27), the right side of described high pressure oil import (26), the inside of valve body (25) is equipped with pedestal (1), the inside, left side of described pedestal (1) is equipped with main valve plug (2), the right side of described pedestal (1) is equipped with and screws in cover (4), the left end of described screw-in cover (4) is connected with the right-hand member of main valve plug (2) by the first spring (23), the inside, left side of described screw-in cover (4) is equipped with conical guide's spool (20), described screw-in cover (4) is connected with the inner thread of valve body (25), screw-in cover (4) inside on described guide's spool (20) right side is threaded connection adjustment sleeve (12) is installed, the internal pressurization piston (10) of described adjustment sleeve (12), be connected with the second spring (9) between the right-hand member of the left end of described charged piston (10) and guide's spool (20), the inside, right side of described adjustment sleeve (12) has been threaded connection screw-in screw (13), between described screw-in screw (13) and charged piston (10), by block (11), be connected.
2. a kind of thread type pilot operated compound relief valve according to claim 1, it is characterized in that, have a small through hole (28) in the middle of the inner hollow of described main valve plug (2) and left end, the left end inside of described screw-in cover (4) is equipped with a filter screen (6), the left end of described filter screen (6) is connected with a filter screen back-up ring (5), is connected with the 3rd spring (3) between described filter screen back-up ring (5) and left side main valve plug (2).
3. a kind of thread type pilot operated compound relief valve according to claim 1, it is characterized in that, the outside of described adjustment sleeve (12) is threaded connection the large locking nut (15) withstood with the right-hand member that screws in cover (4), and the outside of described screw-in screw (13) is threaded connection the little locking nut (14) that the right-hand member with adjustment sleeve (12) withstands.
4. a kind of thread type pilot operated compound relief valve according to claim 1, it is characterized in that, O RunddichtringO (22), PVC＝polyvinyl chloride back-up ring (21) are installed from left to right successively and Steel Cable Baffle Ring (7) for hole between the left end of described screw-in cover (4) outside and pedestal (1), between described screw-in cover (4) and valve body (25), adjustment sleeve (12) and screw-in overlaps between (4), O RunddichtringO (22) all is installed between block (11) and adjustment sleeve (12).
5. a kind of thread type pilot operated compound relief valve according to claim 1, is characterized in that, the outside of the right side of described pedestal (1), screw-in cover (4) is mounted with back-up ring (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220538555 CN202955297U (en) | 2012-10-19 | 2012-10-19 | Threaded pilot-operated overflow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220538555 CN202955297U (en) | 2012-10-19 | 2012-10-19 | Threaded pilot-operated overflow valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202955297U true CN202955297U (en) | 2013-05-29 |
Family
ID=48460869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220538555 Expired - Fee Related CN202955297U (en) | 2012-10-19 | 2012-10-19 | Threaded pilot-operated overflow valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202955297U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103452935A (en) * | 2013-08-27 | 2013-12-18 | 北京机械设备研究所 | Hydraulic valve for closed system with pump output pressure not interfered by load |
| CN104776255A (en) * | 2015-03-30 | 2015-07-15 | 苏州固基电子科技有限公司 | Pressure valve |
| CN105134681A (en) * | 2015-10-08 | 2015-12-09 | 杭州力龙液压有限公司 | One-way cushion overflow valve and closed-type hydraulic pump |
| CN112460092A (en) * | 2020-12-10 | 2021-03-09 | 山东泰丰智能控制股份有限公司 | Flow valve and overflow valve integrated threaded cartridge valve |
| CN112682378A (en) * | 2020-12-23 | 2021-04-20 | 南岳电控（衡阳）工业技术股份有限公司 | But pressure boost screw thread cartridge formula guide overflow valve |
-
2012
- 2012-10-19 CN CN 201220538555 patent/CN202955297U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103452935A (en) * | 2013-08-27 | 2013-12-18 | 北京机械设备研究所 | Hydraulic valve for closed system with pump output pressure not interfered by load |
| CN103452935B (en) * | 2013-08-27 | 2015-11-18 | 北京机械设备研究所 | A kind of pump delivery pressure is not by the closed system hydrovalve of load disturbance |
| CN104776255A (en) * | 2015-03-30 | 2015-07-15 | 苏州固基电子科技有限公司 | Pressure valve |
| CN105134681A (en) * | 2015-10-08 | 2015-12-09 | 杭州力龙液压有限公司 | One-way cushion overflow valve and closed-type hydraulic pump |
| CN105134681B (en) * | 2015-10-08 | 2017-06-06 | 杭州力龙液压有限公司 | A kind of one-way buffer overflow valve and closed type hydraulic pump |
| CN112460092A (en) * | 2020-12-10 | 2021-03-09 | 山东泰丰智能控制股份有限公司 | Flow valve and overflow valve integrated threaded cartridge valve |
| CN112682378A (en) * | 2020-12-23 | 2021-04-20 | 南岳电控（衡阳）工业技术股份有限公司 | But pressure boost screw thread cartridge formula guide overflow valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130529 Termination date: 20151019 |
|
| EXPY | Termination of patent right or utility model |