CN108061070B - A kind of pressure-control valve - Google Patents

A kind of pressure-control valve Download PDF

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Publication number
CN108061070B
CN108061070B CN201711375309.9A CN201711375309A CN108061070B CN 108061070 B CN108061070 B CN 108061070B CN 201711375309 A CN201711375309 A CN 201711375309A CN 108061070 B CN108061070 B CN 108061070B
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CN
China
Prior art keywords
valve
pressure
channel
spool
hydraulic fluid
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CN201711375309.9A
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Chinese (zh)
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CN108061070A (en
Inventor
陈艳艳
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江苏佳佩环保机械设备有限公司
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Publication of CN108061070A publication Critical patent/CN108061070A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/029—Counterbalance valves

Abstract

The invention proposes a kind of pressure-control valves, the pressure-control valve connects the control mouth of controlled valve, it and include: valve body, it 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 third valve channel, first valve channel, the second valve channel and third 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, and the oil outlet end of the check valve connects hydraulic fluid port B；Counterbalance valve is located on third 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 technique

In the mechanical equipments such as modern engineering machinery, building machinery, hydraulic load bearing system is widely applied, wherein balancing Valve is the key that this kind of system Hydraulic Elements.Currently, 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 decline, existing balanced valve is provided with several resistances generally at pilot control valve Buddhist nun hole, such as the Chinese utility model patent of Patent No. ZL 01139093.X, entitled " hydraulically balanced valve " are exactly such set Meter.But the pilot control valve of several damping holes of this set has the drawback that: when control load decline, 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, will cause balanced valve open with Delay is closed, to cause actuator movement lag, influences operating efficiency, especially (example when hydraulic oil viscosity is relatively high Such as: the relatively low environment of temperature) this lagging influence is more obvious.Actuator movement lag will cause working connection pressure and rise very Height, balanced valve could be opened, this will result in load cavity pressurization, so that system pressure is in high pressure conditions, seriously affect The performance of Hydraulic Elements and service life；On the other hand the momentary load that can be opened in balanced valve accelerates decline, and speed is uncontrollable.

Summary of the invention

For some or all of of the above-mentioned technical problem in the presence of the prior art, the 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 the above goal of the invention, on the one hand, the invention proposes a kind of pressure-control valve having following structure, The control valve connects the control mouth of controlled valve, and includes:

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 third valve channel, first valve channel, the second valve channel and third 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, the pressure reducing valve include valve pocket, spool, the first elastic component and pressure regulating mechanism, the valve Set is fixedly connected on the valve body by helicitic texture, and interconnected the first chamber and the second chamber, institute are equipped in the valve pocket The channel that the leakage hole being connected on second valve channel and valve body is respectively equipped on the second chamber is stated, the spool is flexibly connected On valve pocket, and valve core channel is equipped in it, the first intracavitary be crimped on that first elastic component is located at valve pocket is led to far from spool On one end of the spool in road, the first elastic component described in the pressure regulating mechanism is connected with valve pocket, for adjustment effect in spool On pressure；

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 at the oil outlet end of valve, the check valve connects hydraulic fluid port B, and the check valve includes valve seat, screw plug, steel ball, gasket With the second elastic component, the valve seat and screw plug are both connected on valve body, the steel ball and the second elastic component be located at the valve seat with The third that the screw plug is formed is intracavitary, and the valve seat is equipped with the oil inlet and oil outlet for being connected to the third chamber, the oil inlet The diameter of mouth is greater than the diameter of the oil outlet, and the steel ball is connected to the oil inlet under the action of second elastic component On；And

Counterbalance valve is connected on the third valve channel of valve body, and the spool control third channel of the counterbalance valve Open and close, the counterbalance valve include pressure set up an organization, back pressure spool and third elastic component, the pressure sets up an organization spiral shell Line is fixedly connected on the valve body, and the back pressure spool is movably arranged in valve body, and the back pressure spool is equipped with the conical surface, described The conical surface can block the valve port on valve body to separate third channel, and third elastic component one end is against on the back pressure spool End, the other end are against on the pressure sets up an organization.

When the control mouth pressure of controlled valve is not up to preset value, the pressure reducing valve and check valve are opened, and oil liquid is through hydraulic fluid port A, the pressure reducing valve on the second valve channel and check valve, hydraulic fluid port B flow to the control mouth of controlled valve；

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

When the control mouth pressure of controlled valve and the pressure difference value of hydraulic fluid port A are not up to the counterbalance valve setting value, oil liquid 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 of controlled valve and the pressure difference value of hydraulic fluid port A reach the counterbalance valve setting value, the back pressure Valve is opened, and oil liquid flows to hydraulic fluid port A through hydraulic fluid port B, the counterbalance valve by the control mouth for being controlled 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 regulating mechanism includes adjusting rod and fastening 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 far from ball seat One end of part, the fastening nut are threadedly engaged with the adjusting rod.

In one embodiment, the diameter of first chamber is greater 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 to the second valve channel.

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 pushes the spool movement of pressure reducing valve to be connected to valve body Leakage hole.

In one embodiment, the pressure sets up an organization including Adjusting bolt Adjusting screw and locking nut, the locking nut It is threadedly engaged with the Adjusting bolt Adjusting screw.

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

Due to using the first valve channel, the second valve channel and third valve channel in parallel, and in the first valve body Fixed damping is set on channel, pressure reducing valve and check valve are set on the second valve channel, back pressure is set on third valve channel Valve, the resistance that oil liquid is subject to by the second valve channel and limitation are compared the resistance for flowing through the first circulation passage and are limited small very It is more, for controlling balanced valve, so as to so that oil liquid 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 increased 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 of balanced valve main valve and the difference of external control pressure are set less than counterbalance valve Definite value, oil liquid are reduced rapidly outside control pressure when needing to close balanced valve by fixed damping outflow control plunger shaft When, balanced valve controls the pressure of plunger shaft and control pressure difference value is greater than counterbalance valve setting value, and oil liquid is quickly flowed out through counterbalance valve Control plunger shaft, not only can filter pressure fluctuation can be with quick closedown balanced valve.

Detailed description of the invention

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

Fig. 1 shows the structural schematic diagram of one of embodiment of pressure-control valve of the invention；

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

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

In attached drawing, identical component uses identical appended drawing reference.The attached drawing is not drawn according to the actual ratio.

Specific embodiment

In order to which technical solution of the present invention and advantage is more clearly understood, below in conjunction with attached drawing to of the invention exemplary Embodiment is described in more detail.Obviously, the described embodiments are merely a part of the embodiments of the present invention, rather than The exhaustion of all embodiments.And in the absence of conflict, the feature in the embodiment and embodiment in the present invention can be mutual It combines.

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

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

It as figure 1 shows one of embodiment of pressure-control valve of the invention.In this embodiment, pressure of the invention Force control valve specifically includes that valve body 4, the first valve channel 4.1, the second valve channel 4.2, third 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 third 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 on the second valve channel 4.2 by series system, 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 third valve channel 4.3, It can control the open and close of third channel 4.3 by the spool of counterbalance valve 5

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

In one embodiment, as depicted in figs. 1 and 2, to reach preset value in the control mouth pressure of controlled valve 5 (such as big When 5MPa), 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.Oil liquid flows to the control mouth of controlled valve 5 through the fixed damping 3 on hydraulic fluid port A, the first valve channel 4.1, hydraulic fluid port B.

In one embodiment, as depicted in figs. 1 and 2, the pressure difference value of the control mouth pressure of controlled valve and hydraulic fluid port A not When reaching 5 setting value of counterbalance valve (being, for example, less than 2MPa), oil liquid 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, it is reached in the control mouth pressure of controlled valve and the pressure difference value of hydraulic fluid port A When (such as equal to or more than 2MPa) to 5 setting value of pressure valve, counterbalance valve 5 is opened, and oil liquid 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 for referring to control the spool for closing pressure reducing valve 1 by adjusting.Open type decompression Valve arrangement makes when starting to control controlled valve, and oil liquid rapidly can flow to quilt from A hydraulic fluid port through the second valve channel 4.2 The control mouth of valve 5 is controlled 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 to the main valve of controlled valve.

In one embodiment, as shown in Figure 1, pressure reducing valve 1 specifically includes that 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 is fixedly connected on valve body 4 above, and by helicitic texture.Valve pocket The first interconnected chamber (being 1.2 place chamber of the first elastic component in Fig. 1, be located at upper end) and the second chamber are equipped in 1.1 (in Fig. 1 That is 1.6 place chamber of spool is located at lower end).In addition, being respectively equipped with the leakage on the second valve channel of connection and valve body on the second chamber The channel 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 First in valve pocket 1.1 is intracavitary, and the first elastic component 1.2 is crimped on (i.e. spool on one end of the spool 1.6 far 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 fastening nut 1.9, Nut 1.9 is threadedly engaged with adjusting rod 1.5.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 tighten or unscrew to adjust the decrement of the first elastic component 1.2, 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 to 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 far 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 is greater than the diameter of the second chamber, and spool 1.6 is 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 connects at the accent of the second chamber and valve core channel is connected to 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 upwards on the cavity of valve body 4 by screw plug 2.1.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.Steel ball 2.2 and the second elastic component 2.5 are located at valve seat 2.3 with screw plug 2.1 formed third it is intracavitary, valve seat 2.3 be equipped with connection third chamber oil inlet and oil outlet, oil inlet it is straight Diameter is greater than the diameter of oil outlet, and steel ball 2.2 is connected on the oil inlet under the action of the second elastic component 2.5.

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 slide 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, so that the leakage hole L being connected on valve body 4 carries out pressure release.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 include pressure set up an organization, back pressure spool 5.3 and third bullet 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.Third 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 is threadedly engaged with Adjusting bolt Adjusting screw 5.2.

As shown in figure 3, being the application principle figure of pressure-control valve of the invention in hydraulic system, the hydraulic system is main It include: hydraulic power source 7, directional control valve 9, hydraulic cylinder 6, balanced valve 8 and the pressure of the invention being connect 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 are as follows: from hydraulic power source 7 come out oil liquid through 9 rear portion of directional control valve into Enter hydraulic cylinder 6, another part is introduced into the hydraulic fluid port A on the valve body 4 of pressure-control valve of the invention, hydraulic fluid port A and hydraulic fluid port B by the One valve channel 4.1, the second valve channel 4.2 are connected to third channel 4.3.

When the control cavity pressure of balanced valve 8 not up to sets pressure, second communicating passage of the oil liquid 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 oil liquid through pressure-control valve gently enters controlled chamber.To not only can be with Reduce balanced valve 8 and open lagging influence, and does not influence the stability of the pilot control part of controlled valve 8 again.

When hydraulic cylinder 6 is begun to decline, 8 energy quick response of balanced valve, In under the action of pressure-control valve of the invention During decline, the decrease speed of hydraulic cylinder 6 is controllable, and hydraulic cylinder 6 is gently declined or basic uniform descent.Work as pressure When A mouthfuls of pressure oscillation decline of force control valve, 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 oil liquid can only flow to A mouthfuls through fixed damping 3, therefore balanced valve 8 moves steadily, when hydraulic When cylinder 6 needs to stop, A mouthfuls of rapid pressure drops, setting pressure of the difference greater than counterbalance valve 5 of B mouthfuls of pressure and A mouthfuls of pressure, back Pressure valve 5 is opened, and by the control chamber of balanced valve 8 through the A mouth of the outspoken fast feed pressure control valve of B, balanced valve 8 can be closed quickly oil liquid It closes.

Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic Property concept, then additional changes and modifications may be made to these embodiments.Therefore, it includes excellent that the following claims are intended to be interpreted as Select embodiment and fall into having altered and/or modifying for the scope of the invention, the change that embodiment according to the present invention is made and/ Or modification should be covered by the protection scope of the present invention.

Claims (6)

1. a kind of pressure-control valve, which is characterized in that the control valve connects the control mouth of controlled valve, and includes:
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 Channel and third valve channel, first valve channel, the second valve channel and third 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 in channel, the pressure reducing valve include valve pocket, spool, the first elastic component and pressure regulating mechanism, and the valve pocket is logical It crosses helicitic texture to be fixedly connected on the valve body, is equipped with interconnected the first chamber and the second chamber in the valve pocket, described the The channel for the leakage hole being connected on second valve channel and valve body is respectively equipped on two chambers, the spool is movably connected in valve It puts on, and is equipped with valve core channel in it, what first elastic component was located at valve pocket first intracavitary is crimped on far from valve core channel On one end of spool, the first elastic component described in the pressure regulating mechanism is connected with valve pocket, for adjustment effect on spool Pressure；
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 of the check valve connect hydraulic fluid port B, and the check valve includes valve seat, screw plug, steel ball, gasket and the Two elastic components, the valve seat and screw plug are both connected on valve body, the steel ball and the second elastic component be located at the valve seat with it is described The third that screw plug is formed is intracavitary, and the valve seat is equipped with the oil inlet and oil outlet for being connected to the third chamber, the oil inlet Diameter is greater than the diameter of the oil outlet, and the steel ball is connected on the oil inlet under the action of second elastic component； And
Counterbalance valve is connected on the third valve channel of valve body, and the unlatching of the spool control third channel of the counterbalance valve With closing, the counterbalance valve include pressure set up an organization, back pressure spool and third elastic component, the pressure screw thread that sets up an organization is solid Surely it is connected on the valve body, the back pressure spool is movably arranged in valve body, and the back pressure spool is equipped with the conical surface, the conical surface The valve port on valve body can be blocked to separate third channel, third elastic component one end is against back pressure spool upper end, separately One end is against on the pressure sets up an organization；
When the control mouth pressure of controlled valve is not up to preset value, the pressure reducing valve and check valve are opened, and oil liquid is through hydraulic fluid port A, the Pressure reducing valve and check valve, hydraulic fluid port B on two valve channels flow to the control mouth of controlled valve；
After the control mouth pressure of controlled valve reaches preset value, the pressure reducing valve is closed, and oil liquid is through hydraulic fluid port A, the first valve channel On fixed damping, hydraulic fluid port B flow to the control mouth of controlled valve；
When the control mouth pressure of controlled valve and the pressure difference value of hydraulic fluid port A are not up to the counterbalance valve setting value, oil liquid 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 of controlled valve and the pressure difference value of hydraulic fluid port A reach the counterbalance valve setting value, the counterbalance valve is beaten It opens, oil liquid flows to hydraulic fluid port A through hydraulic fluid port B, the counterbalance valve by the control mouth for being controlled valve.
2. a kind of pressure-control valve according to claim 1, which is characterized in that the pressure reducing valve is to adjust function with pressure The normally opened three-way pressure reducing valve of energy.
3. a kind of pressure-control valve according to claim 1, which is characterized in that the pressure regulating mechanism includes adjusting rod And fastening 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 far from ball seat, and the fastening nut is threadedly engaged with the adjusting rod.
4. a kind of pressure-control valve according to claim 3, which is characterized in that the diameter of first chamber is greater than the second chamber Diameter, the spool be T-type structure, the small end of the spool is slidably matched with the second chamber, under the action of the first elastic component, The spool is crimped at the accent of second chamber and valve core channel is connected to the second valve channel.
5. a kind of pressure-control valve according to claim 1, 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 pushes The leakage hole of the mobile connection valve body of the spool of pressure reducing valve.
6. a kind of pressure-control valve according to claim 1, which is characterized in that the pressure sets up an organization including adjusting spiral shell Set and locking nut, the locking nut are threadedly engaged with the Adjusting bolt Adjusting screw.
CN201711375309.9A 2017-12-19 2017-12-19 A kind of pressure-control valve CN108061070B (en)

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