CN108061070A - A kind of pressure-control valve - Google Patents

A kind of pressure-control valve Download PDF

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Publication number
CN108061070A
CN108061070A CN201711375309.9A CN201711375309A CN108061070A CN 108061070 A CN108061070 A CN 108061070A CN 201711375309 A CN201711375309 A CN 201711375309A CN 108061070 A CN108061070 A CN 108061070A
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CN
China
Prior art keywords
valve
pressure
channel
control
hydraulic fluid
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CN201711375309.9A
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Chinese (zh)
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CN108061070B (en
Inventor
陈艳艳
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宁波文泽机电技术开发有限公司
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Publication of CN108061070A publication Critical patent/CN108061070A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/029Counterbalance valves

Abstract

The present invention proposes a kind of pressure-control valve, the control mouth of the controlled valve of pressure-control valve connection, and including:Valve body, which is provided with hydraulic fluid port A, hydraulic fluid port B and the first valve channel being connected between hydraulic fluid port A and hydraulic fluid port B, the second valve channel and the 3rd valve channel, and first valve channel, the second valve channel and the 3rd valve channel are in parallel;Fixed damping, is located on the first valve channel;Pressure reducing valve is connected on valve body, and the spool of the pressure reducing valve is connected to the open and close that the second valve channel is controlled on the second valve channel;And check valve, it is connected on the second valve channel of valve body, the oil inlet end of the check valve connects the oil outlet end of the pressure reducing valve, the oil outlet end connection hydraulic fluid port B of the check valve;Counterbalance valve is located on the 3rd valve channel.The pressure-control valve can reduce the lagging influence that controlled valve opens and closes, and not influence the stability of the pilot control part of controlled valve again.

Description

A kind of pressure-control valve

Technical field

The present invention relates to valve technology fields, and in particular to a kind of pressure-control valve.

Background technology

In the mechanical equipments such as modern engineering machinery, building machinery, hydraulic pressure load bearing system is widely applied, wherein balancing Valve is the key that this kind of system Hydraulic Elements.At present, well known balanced valve is mainly made of pilot control valve and main valve, in order to increase Add the damping of balanced valve, reduce shake when load declines, existing balanced valve is provided with several resistances generally at pilot control valve Buddhist nun hole, such as Patent No. ZL 01139093.X, the Chinese utility model patent of entitled " hydraulically balanced valve " they are exactly such set Meter.But the pilot control valve of several damping holes of this set has the drawback that:When control load declines, due to resistance Buddhist nun is excessive, and the pressure of the working connection of actuator is lagged behind by the variation of the pilot pressure of damping hole, can cause balanced valve open with Delay is closed, so as to cause actuator action hysteresis, influences operating efficiency, (the example especially when hydraulic oil viscosity is higher Such as:Temperature is than relatively low environment) this lagging influence is more obvious.Actuator action hysteresis can cause working connection pressure to rise very Height, balanced valve could be opened, this will result in load cavity supercharging, and system pressure is on the one hand made to be in high pressure conditions, is seriously affected The performance of Hydraulic Elements and service life;On the other hand can accelerate to decline in the momentary load that balanced valve is opened, speed is uncontrollable.

The content of the invention

For some or all of of the above-mentioned technical problem in the presence of the prior art, the present invention proposes a kind of pressure Control valve, the pressure-control valve can reduce the lagging influence that controlled valve opens and closes, and not influence the elder generation of controlled valve again Lead the stability of control section.

In order to realize more than goal of the invention, on the one hand, the present invention proposes a kind of pressure-control valve having following structure, The control mouth of the controlled valve of control valve connection, and including:

Valve body which is provided with hydraulic fluid port A, hydraulic fluid port B and the first valve channel being connected between hydraulic fluid port A and hydraulic fluid port B, second Valve channel and the 3rd valve channel, first valve channel, the second valve channel and the 3rd valve channel are in parallel;

Fixed damping, is located on the first valve channel;

Pressure reducing valve is connected on valve body, and the spool of the pressure reducing valve is connected on the second valve channel and controls second The open and close of valve channel;And

Check valve is connected on the second valve channel of valve body, and the oil inlet end of the check valve connects the decompression The oil outlet end of valve, the oil outlet end connection hydraulic fluid port B of the check valve;

Counterbalance valve is connected on the 3rd valve channel of valve body, and the spool control third channel of the counterbalance valve It opens and closes.

In one embodiment, when the control mouth pressure of controlled valve is not up to preset value, the pressure reducing valve and unidirectional Valve is opened, and fluid is through the pressure reducing valve on hydraulic fluid port A, the second valve channel and check valve, the control mouth of the controlled valve of hydraulic fluid port B flow directions;

After the control mouth pressure of controlled valve reaches preset value, the pressure reducing valve is closed, and fluid is through hydraulic fluid port A, the first valve body Fixed damping, the control mouth of the controlled valve of hydraulic fluid port B flow directions on passage;

When the control mouth pressure of controlled valve is not up to the counterbalance valve setting value with the pressure difference value of hydraulic fluid port A, fluid by The control mouth of controlled valve flows to hydraulic fluid port A through the fixed damping on hydraulic fluid port B, the first valve channel;

When the control mouth pressure and the pressure difference value of hydraulic fluid port A of controlled valve reach the counterbalance valve setting value, the back pressure Valve is opened, and fluid flows to hydraulic fluid port A by the control mouth for being controlled valve through hydraulic fluid port B, the counterbalance valve.

In one embodiment, the pressure reducing valve is the normally opened three-way pressure reducing valve with pressure adjusting function.

In one embodiment, the pressure reducing valve includes:

Valve pocket is fixedly connected on by helicitic texture on the valve body, and first to be interconnected is equipped in the valve pocket Chamber and the second chamber, second chamber are equipped with the passage for connecting second valve channel and the leakage hole on valve body;

Spool is movably connected on valve pocket, interior to be equipped with valve core channel;

First elastic component, the first intracavitary for being located at valve pocket are crimped on one end of the spool away from valve core channel;And

Pressure regulating mechanism is connected with first elastic component and valve pocket, for pressure of the adjustment effect on spool.

In one embodiment, the pressure regulating mechanism includes adjusting rod and clamp nut, first elastic component Steel ball and ball seat are additionally provided between the spool, the ball seat is equipped with the groove for accommodating steel ball, and in the first elastic component Steel ball is crimped on by the recessed of the spool by ball seat under effect and meets place, the adjusting rod is connected to the first elasticity away from ball seat One end of part, the nut and the adjusting rod thread fitting.

In one embodiment, the diameter of first chamber is more than the diameter of the second chamber, and the spool is T-type structure, The small end of the spool is slidably matched with the second chamber, and under the action of the first elastic component, the spool is crimped on described second At the accent of chamber and valve core channel is connected with the second valve channel.

In one embodiment, the check valve includes valve seat, screw plug, steel ball, gasket and the second elastic component, the valve Seat and screw plug are both connected on valve body, and the steel ball and the second elastic component are located at the 3rd chamber that the valve seat is formed with the screw plug Interior, the valve seat is equipped with the oil inlet and oil outlet for connecting the 3rd chamber, and the diameter of the oil inlet is more than described fuel-displaced The diameter of mouth, the steel ball are connected under the action of second elastic component on the oil inlet.

In one embodiment, the pressure reducing valve is normally opened three-way slide valve structure, after pressure reducing valve closing, due to Pressure of the leakage of pressure reducing valve between the pressure reducing valve and the check valve promotes the spool movement of pressure reducing valve to connect valve body Leakage hole.

In one embodiment, the counterbalance valve includes:

Pressure sets up an organization, and is screwed and is connected on the valve body;

Back pressure spool, is movably arranged in valve body, and the back pressure spool is equipped with the conical surface, and the conical surface can block valve body On valve port to separate third channel;And

3rd elastic component, its one end are against the back pressure spool upper end, and the other end is against on the pressure sets up an organization.

In one embodiment, the pressure regulating mechanism includes Adjusting bolt Adjusting screw and locking nut, the locking nut With the Adjusting bolt Adjusting screw thread fitting.

Compared with prior art, it is the advantages of pressure-control valve of the invention:

As a result of the first valve channel, the second valve channel and the 3rd valve channel in parallel, and in the first valve body Fixed damping on passage is set, pressure reducing valve and check valve on the second valve channel are set, back pressure is set on the 3rd valve channel Valve, fluid is compared by the resistance that the second valve channel is subject to limitation to be flowed through the resistance of the first circulation passage and limits small very It is more, exemplified by controlling balanced valve, so as to so that fluid by after the second valve channel in balanced valve main valve control piston Chamber sets up rapidly pressure, improves the dynamic responding speed of main valve, reduces balanced valve and opens lagging influence.It is opened when reaching main valve After opening pressure, pressure reducing valve can be automatically closed, and the hydraulic oil of working connection can only flow into balanced valve control plunger shaft by fixed damp, The damping of system is added in turn, balanced valve can not only be made slowly to open, and can also effectively inhibit vibration;And when external control When pressing pressure fluctuation reduces, when the control piston cavity pressure and the difference of external control pressure of balanced valve main valve are set less than counterbalance valve Definite value, fluid damps outflow control plunger shaft by fixing, and working as needs closing balanced valve to reduce rapidly external control pressure When, the pressure of balanced valve control plunger shaft is more than counterbalance valve setting value with control pressure difference, and fluid is quickly flowed out through counterbalance valve Plunger shaft is controlled, so can not only be fluctuated with filter pressure can be with quick closedown balanced valve.

Description of the drawings

The preferred embodiment of the present invention is described in detail below in conjunction with attached drawing, in figure:

Fig. 1 shows the structure diagram of one of embodiment of the pressure-control valve of the present invention;

Fig. 2 shows the hydraulic schematic diagram of the pressure-control valve of the present invention;

Fig. 3 shows the hydraulic circuit diagram of the hydraulic system of the pressure-control valve including the present invention.

In attached drawing, identical component uses identical reference numeral.Attached drawing is not drawn according to actual ratio.

Specific embodiment

In order to which technical scheme and advantage is more clearly understood, below in conjunction with attached drawing to the exemplary of the present invention Embodiment is described in more detail.Obviously, described embodiment be only the present invention part of the embodiment rather than The exhaustion of all embodiments.And in the case where there is no conflict, the feature in the embodiment and embodiment in the present invention can be mutual It is combined.

Inventor is during invention it is noted that controlling balanced valve by being provided with the pilot control valve of several damping holes Or other types are when being controlled valve, being controlled valve, to open and close hysteresis obvious, and controlled valve stability is not high.

For above deficiency, the embodiment of the present invention proposes a kind of pressure-control valve, is illustrated below.

It as figure 1 shows the one of which embodiment of the pressure-control valve of the present invention.In this embodiment, pressure of the invention Force control valve mainly includes:Valve body 4, the first valve channel 4.1, the second valve channel 4.2, the 3rd valve channel 4.3, fixed resistance Buddhist nun 3, pressure reducing valve 1, check valve 2 and counterbalance valve 5.Wherein, valve body 4 is equipped with hydraulic fluid port A and hydraulic fluid port B, the first valve channel 4.1, the Two valve channels 4.2 and the 3rd valve channel 4.3 are disposed in parallel between the hydraulic fluid port A of valve body 4 and hydraulic fluid port B.Fixed damping 3 is located at On first valve channel 4.1.Pressure reducing valve 1 and check valve 2 are located at by series system on the second valve channel 4.2, pass through decompression The spool position of valve 1 can control the open and close of the second valve channel 4.2.Counterbalance valve 5 is located on the 3rd valve channel 4.3, The open and close of third channel 4.3 can be controlled by the spool of counterbalance valve 5

In one embodiment, as depicted in figs. 1 and 2, the control mouth pressure for being arranged on controlled valve 5 is not up to preset value When (being, for example, less than 5MPa), pressure reducing valve 1 is in opening with check valve 2, and fluid is through on hydraulic fluid port A, the second valve channel 4.2 Pressure reducing valve 1 and check valve 2, the control mouth of the controlled valve 5 of hydraulic fluid port B flow directions.

In one embodiment, as depicted in figs. 1 and 2, in the control mouth pressure of controlled valve 5, to reach preset value (such as big In or equal to 5MPa) when, pressure reducing valve 1 is closed, and with the closing of pressure reducing valve 1, the pressure acted on check valve 2 declines also therewith It closes.Fluid is through the fixed control mouth for damping the controlled valve 5 of 3, hydraulic fluid port B flow directions on hydraulic fluid port A, the first valve channel 4.1.

In one embodiment, as depicted in figs. 1 and 2, it is being controlled the pressure difference value of the control mouth pressure of valve and hydraulic fluid port A not When reaching 5 setting value of counterbalance valve (being, for example, less than 2MPa), fluid is by being controlled the control mouth of valve through on hydraulic fluid port B, the first valve channel Fixed damping flow to hydraulic fluid port A.

In one embodiment, as depicted in figs. 1 and 2, reached in the control mouth pressure and the pressure difference value of hydraulic fluid port A of controlled valve To (such as equal to or more than 2MPa) during 5 setting value of pressure valve, counterbalance valve 5 is opened, and fluid is by being controlled the control mouth of valve through oil Mouth B, counterbalance valve 5 flow to hydraulic fluid port A.

In one embodiment, as shown in Figure 1, pressure reducing valve 1 is the normally opened three-way pressure reducing valve with pressure adjusting function.This The pressure adjusting function at place is the pressure size referred to by adjusting the spool for controlling closing pressure reducing valve 1.Open type depressurizes Valve arrangement so that fluid rapidly can flow to quilt from A hydraulic fluid ports through the second valve channel 4.2 when starting to control controlled valve The control mouth of valve 5 is controlled so as to set up pressure rapidly in the control plunger shaft of the main valve of controlled valve 5, improves the dynamic response of main valve Speed reduces the unlatching lagging influence of the main valve to being controlled valve.

In one embodiment, as shown in Figure 1, pressure reducing valve 1 mainly includes:Valve pocket 1.1, spool 1.6, the first elastic component 1.2 and pressure regulating mechanism.Wherein 1.1 big end of valve pocket passes through helicitic texture and is fixedly connected on valve body 4 above.Valve pocket The first interconnected chamber (being 1.2 place chamber of the first elastic component in Fig. 1, positioned at upper end) and the second chamber are equipped in 1.1 (in Fig. 1 That is 1.6 place chamber of spool, positioned at lower end).In addition, the second valve channel of connection and the leakage on valve body are respectively equipped on the second chamber The passage 1.7 and 1.8 of mouth L.Spool 1.6 is movably connected on valve pocket 1.1, interior to be equipped with valve core channel.First elastic component 1.2 is set In the first intracavitary of valve pocket 1.1, the first elastic component 1.2 is crimped on (i.e. spool on one end of the spool 1.6 away from valve core channel 1.6 upper end).Pressure regulating mechanism is connected on valve pocket, for pressure of the adjustment effect on spool 1.6.

In one embodiment, as shown in Figure 1, pressure regulating mechanism mainly includes adjusting rod 1.5 and clamp nut 1.9, Nut 1.9 and 1.5 thread fitting of adjusting rod.The lower end of adjusting rod 1.5 is connected to the upper end of the first elastic component 1.2.Pass through nut 1.9 decrement tightened or unscrew to adjust the first elastic component 1.2, so as to play the role of adjustment effect on spool 1.6 The effect of power.The active force is also that pressure reducing valve 1 closes the resistance that the second valve channel 4.2 needs overcome.

In one embodiment, steel ball 1.4 and ball seat 1.3 are additionally provided between the first elastic component 1.2 and spool 1.6.Ball seat 1.3 are equipped with the groove for accommodating steel ball 1.4, and are crimped steel ball 1.4 by ball seat 1.3 under the action of the first elastic component 1.2 Recessed in spool 1.6 meets place.Adjusting rod 1.5 is connected to the upper end of the first elastic component 1.2 away from ball seat 1.3, attaching nut 1.9 Play the role of adjusting preset pressure when pressure reducing valve 1 switches.

In a preferred embodiment, the diameter of the first chamber be more than the second chamber diameter, spool 1.6 be T-type structure, valve The small end (being lower end in Fig. 1) of core 1.6 is slidably matched with the second chamber.Under the action of the first elastic component 1.2, spool 1.6 is pressed It is connected at the accent of the second chamber and valve core channel is connected with the second valve channel 4.2 so that pressure reducing valve 1 is in the open position.

In one embodiment, as shown in Figure 1, check valve 2 mainly includes valve seat 2.3, screw plug 2.1, steel ball 2.2, gasket 2.4 and second elastic component 2.5.Wherein, valve seat 2.3 is connected to by screw plug 2.1 upwards on the cavity of valve body 4.Valve seat 2.3 and the chamber Gasket 2.4 is equipped between body.Screw plug 2.1 is threadedly secured on valve body 4.2.2 and second elastic component 2.5 of steel ball is located at valve seat 2.3 with screw plug 2.1 formed the 3rd intracavitary, valve seat 2.3 be equipped with connection the 3rd chamber oil inlet and oil outlet, oil inlet it is straight Footpath is more than the diameter of oil outlet, and steel ball 2.2 is connected under the action of the second elastic component 2.5 on the oil inlet.

In a preferred embodiment, pressure reducing valve 1 is normally opened three-way slide valve structure.After the closing of pressure reducing valve 1, due to subtracting There is leakage in the spool 1.6 of the guiding valve type of pressure valve 1, thus build pressure (herein between pressure reducing valve 1 and check valve 2 Can be understood as setting up pressure on the connecting line between pressure reducing valve 1 and check valve 2), the shape which closes in pressure reducing valve 1 The spool 1.6 that pressure reducing valve 1 is continued to press under state moves up, and pressure release is carried out so as to connect the leakage hole L on valve body 4.Herein, The pressure of the leakage is generally inadequate to open check valve 2.

In one embodiment, as shown in Figure 1, counterbalance valve 5 set up an organization including pressure, 5.3 and the 3rd bullet of back pressure spool Property part 5.4.Pressure sets up an organization, and is screwed and is connected on valve body 4.Back pressure spool 53 is movably arranged in valve body 4, back pressure Spool 5.3 is equipped with the conical surface, and the conical surface can block the valve port on valve body 4 to separate third channel 4.3.3rd elastic component 5.4, one End is against 5.3 upper end of back pressure spool, and the other end is against on pressure sets up an organization.

In one embodiment, as shown in Figure 1, pressure regulating mechanism includes Adjusting bolt Adjusting screw 5.2 and locking nut 5.1, lock Tight nut 5.1 and 5.2 thread fitting of Adjusting bolt Adjusting screw.

As shown in figure 3, the application principle figure for pressure-control valve of the invention in hydraulic system, the hydraulic system are main Including:Hydraulic power source 7, directional control valve 9, hydraulic cylinder 6, balanced valve 8 and the pressure of the invention being connected with the control mouth of balanced valve 8 Control valve.Structure as elucidated before can be used in the pressure-control valve.

The basic functional principle of the hydraulic system is:From hydraulic power source 7 come out fluid through 9 rear portion of directional control valve into Enter hydraulic cylinder 6, another part is introduced into hydraulic fluid port A, hydraulic fluid port A and hydraulic fluid port B on the valve body 4 of the pressure-control valve of the present invention by the One valve channel 4.1, the second valve channel 4.2 are connected with third channel 4.3.

When the control cavity pressure of balanced valve 8 not up to sets pressure, second communicating passage of the fluid through pressure-control valve 4.2 pressure reducing valve 1 and check valve 2 enters controlled chamber quickly to establish pressure.Reach setting pressure in the control cavity pressure of balanced valve 8 After power, the fixed damping 3 of first communicating passage 4.1 of the fluid through pressure-control valve is gently into controlled chamber.So as to not only can be with Reduce balanced valve 8 and open lagging influence, and do not influence the stability of the pilot control part of controlled valve 8 again.

When hydraulic cylinder 6 is begun to decline, the 8 energy quick response of balanced valve under the action of the pressure-control valve of the present invention, During decline, the decrease speed of hydraulic cylinder 6 can control so that hydraulic cylinder 6 can gently decline or basic uniform descent.Work as pressure When A mouthfuls of pressure oscillations of force control valve decline, the difference of B mouthfuls of pressure and A mouthfuls of pressure is not enough to overcome the setting pressure of counterbalance valve 5 When, A mouthfuls of pressure oscillations are filtered, and B mouthfuls of fluid can only flow to A mouthfuls, therefore 8 stable movement of balanced valve through fixed damping 3, work as hydraulic pressure When cylinder 6 needs to stop, A mouthful rapid pressure drops, the difference of B mouthful pressure and A mouthfuls of pressure is carried on the back more than the setting pressure of counterbalance valve 5 Pressure valve 5 is opened, and fluid can be closed quickly by A mouths of the control chamber of balanced valve 8 through the outspoken fast feed pressure control valves of B, balanced valve 8 It closes.

Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation Property concept, then can make these embodiments other change and modification.Therefore, appended claims are intended to be construed to include excellent Select embodiment and fall into having altered and/or changing for the scope of the invention, the change made according to an embodiment of the invention and/ Or modification should be covered by the protection scope of the present invention.

Claims (10)

1. a kind of pressure-control valve, which is characterized in that the control mouth of the controlled valve of control valve connection, and including:
Valve body which is provided with hydraulic fluid port A, hydraulic fluid port B and the first valve channel being connected between hydraulic fluid port A and hydraulic fluid port B, the second valve body Passage and the 3rd valve channel, first valve channel, the second valve channel and the 3rd valve channel are in parallel;
Fixed damping, is located on the first valve channel;
Pressure reducing valve is connected on valve body, and the spool of the pressure reducing valve is connected on the second valve channel and controls the second valve body The open and close of passage;
Check valve is connected on the second valve channel of valve body, and the oil inlet end of the check valve connects the pressure reducing valve Oil outlet end, the oil outlet end connection hydraulic fluid port B of the check valve;And
Counterbalance valve is connected on the 3rd valve channel of valve body, and the unlatching of the spool control third channel of the counterbalance valve With closing.
2. a kind of pressure-control valve according to claim 1, which is characterized in that
When the control mouth pressure of controlled valve is not up to preset value, the pressure reducing valve and check valve are opened, and fluid is through hydraulic fluid port A, the The control mouth of pressure reducing valve and check valve, the controlled valve of hydraulic fluid port B flow directions on two valve channels;
After the control mouth pressure of controlled valve reaches preset value, the pressure reducing valve is closed, and fluid is through hydraulic fluid port A, the first valve channel On fixed damping, the control mouth of the controlled valve of hydraulic fluid port B flow directions;
When the control mouth pressure and the pressure difference value of hydraulic fluid port A of controlled valve are not up to the counterbalance valve setting value, fluid is by being controlled The control mouth of valve flows to hydraulic fluid port A through the fixed damping on hydraulic fluid port B, the first valve channel;
When the control mouth pressure and the pressure difference value of hydraulic fluid port A of controlled valve reach the counterbalance valve setting value, the counterbalance valve is beaten It opens, fluid flows to hydraulic fluid port A by the control mouth for being controlled valve through hydraulic fluid port B, the counterbalance valve.
3. a kind of pressure-control valve according to claim 1 or 2, which is characterized in that the pressure reducing valve is with pressure tune Save the normally opened three-way pressure reducing valve of function.
4. a kind of pressure-control valve according to claim 3, which is characterized in that the pressure reducing valve includes:
Valve pocket is fixedly connected on by helicitic texture on the valve body, be equipped in the valve pocket the first interconnected chamber and Second chamber is respectively equipped with the passage for connecting second valve channel and the leakage hole on valve body on second chamber;
Spool is movably connected on valve pocket, interior to be equipped with valve core channel;
First elastic component, the first intracavitary for being located at valve pocket are crimped on one end of the spool away from valve core channel;And
Pressure regulating mechanism is connected with first elastic component and valve pocket, for pressure of the adjustment effect on spool.
5. a kind of pressure-control valve according to claim 4, which is characterized in that the pressure regulating mechanism includes adjusting rod And clamp nut, steel ball and ball seat are additionally provided between first elastic component and the spool, the ball seat, which is equipped with, accommodates steel The groove of ball, and steel ball is crimped on by the recessed of the spool by ball seat under the action of the first elastic component and connects place, the adjusting Bar is connected to one end of the first elastic component away from ball seat, the nut and the adjusting rod thread fitting.
6. a kind of pressure-control valve according to claim 4 or 5, which is characterized in that the diameter of first chamber is more than the The diameter of two chambers, the spool are T-type structure, and the small end of the spool is slidably matched with the second chamber, in the work of the first elastic component Under, the spool is crimped at the accent of second chamber and valve core channel is connected with the second valve channel.
7. a kind of pressure-control valve according to claim 6, which is characterized in that the check valve includes valve seat, screw plug, steel Ball, gasket and the second elastic component, the valve seat and screw plug are both connected on valve body, and the steel ball and the second elastic component are located at described The 3rd intracavitary that valve seat is formed with the screw plug, the valve seat are equipped with the oil inlet and oil outlet for connecting the 3rd chamber, institute The diameter for stating oil inlet is more than the diameter of the oil outlet, and the steel ball is connected to described under the action of second elastic component On oil inlet.
8. a kind of pressure-control valve according to claim 7, which is characterized in that the pressure reducing valve is normally opened three-way slide valve knot Structure, after pressure reducing valve closing, since pressure of the leakage between the pressure reducing valve and the check valve of pressure reducing valve promotes The leakage hole of the spool movement connection valve body of pressure reducing valve.
9. a kind of pressure-control valve according to claim 1 or 2, which is characterized in that the counterbalance valve includes:
Pressure sets up an organization, and is screwed and is connected on the valve body;
Back pressure spool, is movably arranged in valve body, and the back pressure spool is equipped with the conical surface, and the conical surface can be blocked on valve body Valve port is to separate third channel;
3rd elastic component, its one end are against the back pressure spool upper end, and the other end is against on the pressure sets up an organization.
10. a kind of pressure-control valve according to claim 9, which is characterized in that the pressure regulating mechanism includes adjusting Swivel nut and locking nut, the locking nut and the Adjusting bolt Adjusting screw thread fitting.
CN201711375309.9A 2017-12-19 2017-12-19 A kind of pressure-control valve CN108061070B (en)

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CN109488652A (en) * 2018-12-21 2019-03-19 潍柴动力股份有限公司 A kind of spool closed loop controlling structure and hydraulic control valve
CN109707689A (en) * 2018-12-29 2019-05-03 燕山大学 Variable damper valve

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