CN205349901U - Back pressure valve - Google Patents
Back pressure valve Download PDFInfo
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- CN205349901U CN205349901U CN201620104163.9U CN201620104163U CN205349901U CN 205349901 U CN205349901 U CN 205349901U CN 201620104163 U CN201620104163 U CN 201620104163U CN 205349901 U CN205349901 U CN 205349901U
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Abstract
The utility model relates to a back pressure valve is applicable to the hydraulic system oil return way of large -traffic use electro -hydraulic reversing valve, and the pressure reduction loss is decreased with the power way, and is lower with the cooperation required precision of the main valve body to main valve core, reduce the manufacturing accuracy requirement, the preparation of being convenient for, a back pressure valve, includes the valve body, removes the case of setting in the valve body, and characterized by, valve body personally experience sth. Part of the body and spring box for control valve body, main valve that the order linked firmly from left to right, have seted up control port at control valve body's left end, have seted up oil inlet and oil -out on the main valve body, and the diameter of oil inlet is not more than the diameter of oil -out, the left end of case is the control valve case, and the right -hand member is main valve core, is close to main valve core's left end and has seted up the annular groove on main valve core, and main valve core's the right -hand member face of cylinder can be with the oil inlet shutoff, be provided with the pressure spring in spring box, between case and the valve body, still be provided with the adjusting device who is used for adjusting pressure spring right -hand member position on spring box.
Description
Technical field
This utility model relates to Hydraulic Elements, a kind of counterbalance valve is provided, for using in the hydraulic system oil return line of electro-hydraulic reversing valve, back pressure is provided when being in electro-hydraulic reversing valve position oil return state for oil circuit, it is especially adapted for use in the hydraulic system oil return line using electro-hydraulic reversing valve of big flow, reduces pressure loss and power path loss.
Background technology
Use in the hydraulic system oil return line of electro-hydraulic reversing valve it is generally required to configuration counterbalance valve, when making oil circuit be in electro-hydraulic reversing valve position oil return state, remain in that a pressure, this pressure and back pressure, required initial pressure during to meet electro-hydraulic reversing valve action.Current hydraulic system many uses Direct Action Type low pressure relief valve, as counterbalance valve, is overcome Direct Action Type low pressure relief valve to produce back pressure for the resistance of pressure oil by the pressure of oil circuit sprue pressure oil.Though it is simple and reliable for structure, but no matter whether electro-hydraulic reversing valve works, and the loss that its back pressure produces acts on oil circuit all the time.Will result in system peak power to increase, and the effective operating pressure of system reduces, the oil piping system that especially operating pressure is relatively low, flow is bigger, pressure loss is relatively big, even causes rated service loads to decline.Again, Direct Action Type low pressure spill valve body requires higher with the quality of fit of spool, brings the accuracy of manufacture to require higher, increases manufacture difficulty.
Summary of the invention
The purpose of this utility model is to provide a kind of counterbalance valve, and this counterbalance valve is only in oil return state in position in electro-hydraulic reversing valve, during pump zero load no pressure, produce a less back pressure, when operating pressure is higher than back pressure, is fully opened by operating pressure operated back pressure valve, resistance is not produced for oil circuit sprue.Meanwhile, this counterbalance valve requires relatively low for main valve plug with the quality of fit of main valve body, reduces accuracy of manufacture requirement, it is simple to make.
The purpose of this utility model is to be achieved through the following technical solutions:
A kind of counterbalance valve, including valve body, the mobile spool being arranged in valve body, it is characterized in that, valve body is control valve body, main valve body and the spring box that order is connected from left to right, offering control port at the left end controlling valve body, offer oil-in and oil-out on main valve body, the diameter of oil-in is not more than the diameter of oil-out；The left end of spool is for controlling valve core, and right-hand member is main valve plug, and on main valve plug, the left end near main valve plug offers annular groove, and oil-in can be blocked by the right-hand member face of cylinder of main valve plug；In spring box, between spool and valve body, it is provided with stage clip；Spring box is additionally provided with the adjustment device for adjusting stage clip right end position.
The beneficial effects of the utility model are:
Counterbalance valve is installed in the oil return line of hydraulic system, and control port is connected with fuel pump outlet.When electro-hydraulic reversing valve is in middle position, pump discharge pressure oil is by position oil return in electro-hydraulic reversing valve, oil return is blocked when flowing to counterbalance valve, produce back pressure, required initial pressure during to meet electro-hydraulic reversing valve action, now pump discharge pressure raises, control port pressure is made to raise, control valve core is subject to the effect of pump discharge pressure and overcomes spring force to promote counterbalance valve main valve plug to move to right, and makes oil-in connect with oil-out, and oil return flows to oil return filter or until fuel tank by oil-in and oil-out.And when electro-hydraulic reversing valve commutation work, owing to load event pump discharge pressure is higher, and this pressure promotes the thrust controlling valve core generation more than stage clip elastic force by control port, now spool moves to right to extreme position, the annular channel that main valve plug annular groove is formed connects with oil-in and oil-out that to cause counterbalance valve aperture maximum, is nearly free from resistance for oil circuit sprue.
The main valve plug right-hand member face of cylinder is utilized directly to block oil-in, this simple in construction, it is easy to make bigger runner valve；And the duty of counterbalance valve is generally normally open, therefore during counterbalance valve work, always circulate between oil-in and oil-out, so the closure of oil-in and oil-out very tightly, need not can be reduced accuracy of manufacture requirement, it is simple to make by main valve plug.
As to improvement of the present utility model, for adjusting the adjustment device of stage clip right end position it is, right-hand member at spring box is provided with adjusting screw rod, left end at adjusting screw rod rotates and is provided with spring base, stage clip right-hand member support ring is arranged on spring base, is additionally provided with the also cap for lock adjustment screw rod on adjusting screw rod.
Regulating device adjustment stage clip right end position is when stage clip coefficient of elasticity is certain, regulates the predeformation amount of stage clip, namely regulates the initial elastic force of stage clip, relevant to the back pressure of counterbalance valve.Adopt adjusting screw rod, easy to adjust, quick；Use the axial location of also cap lock adjustment screw rod, effectively safeguard stablizing of back pressure.
As to further improvement of the utility model, the right flank of annular groove is the conical surface.
This improvement, makes the annular channel that annular groove is formed smooth-out, it is possible to reduce when counterbalance valve is opened when especially counterbalance valve aperture is less counterbalance valve for the resistance of pressure oil, perturbs phenomenon when the oil that eases off the pressure flows through valve.
As to further improvement of the utility model, controlling valve core and separate with main valve plug.
This improvement, reduces control valve core and main valve plug axiality requirement, makes control valve body and main valve body be easy to manufacture.
As to further improvement of the utility model, control port in the projected area controlled on valve core end face less than projected area on main valve plug cross section of the conical surface of main valve plug annular groove.
This improvement, makes the thrust that control valve core produces will not be excessive, overcomes stage clip oversize, the problem being unfavorable for making.
As to further improvement of the utility model, controlling valve core and controlling to be provided with sealing ring between valve body, being provided with sealing ring between the two ends and main valve body of main valve plug.
Accompanying drawing explanation
Fig. 1 is counterbalance valve structural representation；
Fig. 2 is counterbalance valve working state schematic representation；
Fig. 3 is counterbalance valve application example schematic diagram.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described in further detail:
Shown in Figure 1, this counterbalance valve, including valve body 1, the mobile spool 2 being arranged in valve body 1, valve body 1 is control valve body 101, main valve body 102 and the spring box 103 that order is connected from left to right, offering control port 3 at the left end controlling valve body 101, offer oil-in 11 and oil-out 10 on main valve body 102, the diameter of oil-in 11 is not more than the diameter of oil-out 10；The left end of spool 2 is for controlling valve core 201, and right-hand member is main valve plug 202, and on main valve plug 202, the left end near main valve plug 202 offers annular groove 9, and oil-in 11 can be blocked by the right-hand member of main valve plug 202 completely；In spring box 103, between spool 2 and valve body 1, it is provided with stage clip 13；Spring box 103 is additionally provided with the adjustment device for adjusting stage clip 13 right end position.
This counterbalance valve can be considered and is made up of control valve, main valve and adjustment device three part.
Control valve to include controlling valve body 101 and the mobile control valve core 201 being arranged in control valve body 101.Cylindrical hole is offered as controlling valve valve pocket in control valve body 101, the left end of cylindrical hole is as control port 3, for ease of being connected with control oil pipe, female thread is set in control port, namely offers female thread at the left end as the cylindrical hole controlling valve valve pocket.Control valve core 201 offers cannelure 4 in cylinder, sealing ring 5 is set in cannelure 4.
Main valve includes main valve body 102 and the mobile main valve plug 202 being arranged in main valve body 102.Cylindrical hole is offered as main valve valve pocket in main valve body 102, it is provided with oil-in 11 and oil-out 10 communicates with main valve valve pocket at main valve body 102 side opening, oil-in 11 and the axis co-planar of oil-out 10 and vertical with main valve valve pocket, namely oil-in 11 and oil-out 10 all pass through with main valve body positive.According to install needs, oil-in 11 and oil-out 10 can have multiple angle, it is illustrated that in be oil-in 11 and oil-out 10 axis collinear.In theory, as long as oil-in 11 is blocked by main valve plug 202 completely can cut off oil circuit, the diameter of oil-in 11 is not more than the diameter of oil-out 10 again, main valve just turns on oil circuit when opening, it practice, for improving processing technology, the internal diameter taking oil-in 11 and oil-out 10 is equal.Left end at cylindrical main valve plug 202 offers the annular channel of pressure oil when annular groove 9 is opened as main valve, for making the annular channel that annular groove 9 is formed smooth-out, when when reduction counterbalance valve is opened, especially counterbalance valve aperture is less, counterbalance valve is for the resistance of pressure oil, perturbing phenomenon when the oil that eases off the pressure flows through valve, the right flank 17 of annular groove 9 is the conical surface.Offer cannelure 8 at the two ends of main valve plug 202, sealing ring 7 is set in cannelure 8.The distance of the cannelure 8 that annular groove 9 right flank is extremely offered at main valve plug 202 right-hand member is more than the diameter of oil-in 11 and oil-out 10, and when making main valve plug 202 be positioned at leftmost bit, oil-in 11 can be blocked by the right-hand member of main valve plug 202 completely.In diagram, the right-hand member at main valve plug 202 is additionally provided with boss 12 as spring base.Pressure oil is allowed certain leakage by oil-in 11 to oil-out 10 so that main valve plug 202 and main valve body 102 quality of fit need not be significantly high.
The spool 2 being made up of control valve core 201 and main valve plug 202 can be overall, it is also possible to is separate.Overall structure, when making spool, clamped one time can complete, and the anufacturability of spool is better, but increases the manufacture and assembly difficulty of matched valve body, and namely the manufacture and assembly manufacturability of valve body is poor；Separate type, although reduce the anufacturability controlling valve core and main valve plug, but optimize the manufacture and assembly manufacturability of valve body.It is true that control valve core 201 and main valve plug 202 are to separate, the control valve core 201 being positioned at left end and the main valve plug 202 being positioned at right-hand member constitute the spool 2 of counterbalance valve.
Control valve body 101 and be connected in the left end of main valve body 102.Right-hand member at main valve body 102 is also fixed with the internal spring box 103 communicated with main valve valve pocket.Right-hand member at spring box 103 moves and is provided with adjusting screw rod 16, left end at adjusting screw rod 16 rotates and is provided with spring base 14, stage clip 13 right-hand member support ring is arranged on this spring base 14, stage clip 13 left end support ring is arranged on the spring base on main valve plug, also rotates and be provided with the also cap 15 for lock adjustment screw rod 16 on adjusting screw rod 16.Be arranged on the adjusting screw rod 16 of spring box 103 right-hand member, rotate the spring base 14 that is arranged on adjusting screw rod 16 left end with and cap 15 constitute the adjustment device of counterbalance valve.Regulating device adjustment stage clip 14 right end position is when stage clip coefficient of elasticity is certain, regulates the predeformation amount of stage clip 14, namely regulates the initial elastic force of stage clip 14, relevant to the back pressure of counterbalance valve.
Control port 3 in the projected area controlled on valve core 201 end face less than projected area on main valve plug 202 cross section of the conical surface of main valve plug annular groove 9.Based on aforementioned, in this case, control the cross-sectional area of valve core 201 less than projected area on main valve plug 202 cross section of the conical surface of main valve plug annular groove 9.
The side at main valve body about 102 two ends is further opened with ventilation mouth 18 UNICOM main valve chamber and outside (ventilation mouth being positioned at main valve body 102 right-hand member is not shown).
It is provided with step 6, it is prevented that control valve core 201 is deviate to control valve body 101 and dropped controlling valve core 201.
Again referring to shown in Fig. 2, Fig. 3, during use, counterbalance valve 22 is installed in the oil return line of hydraulic system, and control port is connected with fuel pump outlet.When electro-hydraulic reversing valve 21 is in middle position, pump discharge pressure oil is by position oil return in electro-hydraulic reversing valve, oil return 20 is blocked when flowing to counterbalance valve 22, produce back pressure, making pump discharge pressure raise, make control port pressure raise simultaneously, control valve core is controlled the active force of oil 19 and overcomes stage clip elastic force to promote counterbalance valve main valve plug to move to right, making oil-in connect with oil-out, oil return flows to oil return filter or until fuel tank by oil-in and oil-out.Now, the back pressure of generation, it is possible to meet required initial pressure during electro-hydraulic reversing valve 21 action.And when electro-hydraulic reversing valve 21 commutation work, owing to load makes pump discharge pressure higher, promoted the thrust controlling valve core generation more than stage clip elastic force by this pressure of control port, now spool moves to right to extreme position, the annular channel that main valve plug annular groove is formed connects with oil-in and oil-out that to cause counterbalance valve aperture maximum, is nearly free from resistance for oil circuit sprue.Now, counterbalance valve does not result in system pressure loss.
The beneficial effects of the utility model are:
Counterbalance valve is the small guide vane unlatching generation back pressure when pump zero load only, when then fully opening when pump load, does not produce back pressure, does not produce system pressure loss for oil circuit sprue.
Simple and compact for structure, it is easy to manufacture, reliability is high.Adopt pressure oil to control valve core and promote main valve plug again, make control pressure adjusting range relatively wide, be particularly suited in the hydraulic system of big flow, reduce pressure loss.
Claims (6)
1. a counterbalance valve, including valve body, the mobile spool being arranged in valve body, it is characterized in that, valve body is control valve body, main valve body and the spring box that order is connected from left to right, offering control port at the left end controlling valve body, offer oil-in and oil-out on main valve body, the diameter of oil-in is not more than the diameter of oil-out；The left end of spool is for controlling valve core, and right-hand member is main valve plug, and on main valve plug, the left end near main valve plug offers annular groove, and oil-in can be blocked by the right-hand member face of cylinder of main valve plug；In spring box, between spool and valve body, it is provided with stage clip；Spring box is additionally provided with the adjustment device for adjusting stage clip right end position.
2. counterbalance valve according to claim 1, it is characterized in that, for adjusting the adjustment device of stage clip right end position it is, right-hand member at spring box is provided with adjusting screw rod, left end at adjusting screw rod rotates and is provided with spring base, stage clip right-hand member support ring is arranged on spring base, is additionally provided with the also cap for lock adjustment screw rod on adjusting screw rod.
3. counterbalance valve according to claim 1, is characterized in that, the right flank of annular groove is the conical surface.
4. counterbalance valve according to claim 1, is characterized in that, controls valve core and separates with main valve plug.
5. the counterbalance valve according to claim 1 or 3, is characterized in that, control port in the projected area controlled on valve core end face less than projected area on main valve plug cross section of the conical surface of main valve plug annular groove.
6. counterbalance valve according to claim 1, is characterized in that, controlling valve core and controlling to be provided with sealing ring between valve body, is provided with sealing ring between the two ends and main valve body of main valve plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620104163.9U CN205349901U (en) | 2016-02-02 | 2016-02-02 | Back pressure valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620104163.9U CN205349901U (en) | 2016-02-02 | 2016-02-02 | Back pressure valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205349901U true CN205349901U (en) | 2016-06-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620104163.9U Active CN205349901U (en) | 2016-02-02 | 2016-02-02 | Back pressure valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205349901U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106958552A (en) * | 2017-04-22 | 2017-07-18 | 新乡市新倍增自动化设备有限公司 | A kind of Electrical hydrostatic actuator return oil pressure valve |
| CN108361235A (en) * | 2018-04-24 | 2018-08-03 | 山河智能装备股份有限公司 | A kind of compact hydraulic control counterbalance valve and its control method |
-
2016
- 2016-02-02 CN CN201620104163.9U patent/CN205349901U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106958552A (en) * | 2017-04-22 | 2017-07-18 | 新乡市新倍增自动化设备有限公司 | A kind of Electrical hydrostatic actuator return oil pressure valve |
| CN106958552B (en) * | 2017-04-22 | 2018-04-13 | 新乡市新倍增自动化设备有限公司 | A kind of Electrical hydrostatic actuator return oil pressure valve |
| CN108361235A (en) * | 2018-04-24 | 2018-08-03 | 山河智能装备股份有限公司 | A kind of compact hydraulic control counterbalance valve and its control method |
| CN108361235B (en) * | 2018-04-24 | 2023-09-08 | 山河智能装备股份有限公司 | Compact hydraulic control back pressure valve and control method thereof |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |