CN101260897A - Hydraulic safety valve - Google Patents
Hydraulic safety valve Download PDFInfo
- Publication number
- CN101260897A CN101260897A CNA2007100856799A CN200710085679A CN101260897A CN 101260897 A CN101260897 A CN 101260897A CN A2007100856799 A CNA2007100856799 A CN A2007100856799A CN 200710085679 A CN200710085679 A CN 200710085679A CN 101260897 A CN101260897 A CN 101260897A
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- valve
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- spring
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Abstract
A hydraulic relief valve comprises a valve housing; a passage which makes a hydraulic driving device to be connected directly with a controller in the housing; a check valve which opens toward the hydraulic driving device in the passage; a control slide valve; and a regulator section. wherein the passage is connected with a connector of the controller side and a connector of the drive side; the control slide valve is provided with a valve section which releases a connection positioned between the connector of the drive side and the connector of the controller side which jumpers over the check valve and parallels with the passage at an opening position of the valve section, the valve section is adjusted by a spring in a closing direction but to be adjusted by a pre-control piston in an opening direction, wherein, an acting surface of the pre-control piston is loaded to control pressure; the regulator section acts upon together with seamed edges of the housing on the control slide valve, only the valve section opens, the regulator section can release a through flow, wherein, a ring seal in the housing makes the pre-control piston seal relative to the passage. The , hydraulic relief is characterized in that an annular chamber is arranged between the valve section and the regulator section in the housing, and an annular groove is arranged between the ring seal and the passage, and is connected by one passage and the annular chamber.
Description
Technical field
The present invention relates to a kind of as claim 1 deadweight safety valve as described in the preamble.
Background technique
By the known a kind of deadweight safety valve of DE 4032420C2, it has one with customer and the direct-connected path of controller, and safety check is set thereon.Control guiding valve (spool) in shell has a valve section, be arranged on the safety check both sides in its connection between the forehearth section, and it is being opened on the direction by the adjustment of pre-control piston, this pre-control on piston an acting surface Loading Control pressure by the spring adjustment on the closing direction.What also have a stagnation pressure also to act on to be produced for example gets around flowing of safety check when the load descending motion, this stagnation pressure is exerted one's influence to the control guiding valve on closing direction.If this stagnation pressure for example owing to the pipeline on the controller side disconnect reduces or even drop to zero, then exist and make the control guiding valve continue opening danger mobile on the direction.Cause rate of descent to increase thus.
By the also known a kind of deadweight safety valve of DE 19641540, wherein, when the decline process that disconnects owing to pipeline, prevent the acceleration of not expecting.For known safety valve, be parallel to path and between customer and controller, have a connecting pipeline, its cross-over connection safety check and the safety valve parts are set therein.As long as hydraulic medium is back to the controller side when the decline process, hydraulic medium just is on the level of tank pressure and with the control guiding valve and whether is positioned at the microcontroller district or opens irrelevant fully.Normally a valve section is arranged in control on the guiding valve in above-mentioned valve, it generally is a metal, connects by the backflow from customer or fluid pressure drive device to fuel tank fully.Generally be provided with one in addition and regulate section, this adjusting section works when the valve section is opened.By in the control guiding valve with the coefficient hole that mills out of seamed edge in the shell aperture through-current capacity of regulator solution piezodielectric delicately.
In known safety valve, control guiding valve phase time seals by the ring sealing in pre-control piston.Because perhaps there is very big pressure in path, therefore the ring sealing will be born under the very big active force.At this disadvantageously, ring is sealed under the strong friction and interacts with the control guiding valve, for the control characteristic of controlling guiding valve adverse effect is arranged.Known safety valve has been provided with a kind of sealing unloading measure.But employed for this reason mechanism is pretty troublesome.
Summary of the invention
Therefore the objective of the invention is, improve the deadweight safety valve of above-mentioned form, can reduce the friction of above-mentioned sealing significantly.
This purpose is achieved by the feature of claim 1.
In the present invention, between path and ring sealing, constitute an annular groove.This annular groove is connected with ring casing on the path opposite side in shell, and this ring casing is in the valve section and regulate between the section and constitute.In case the valve section is because the pilot pressure on the control guiding valve (spool) is opened, ring casing just is on the tank pressure level.Thus, also be the tank pressure level in annular groove.Saved to the pressure-loaded of ring sealing and by means of control guiding valve and adjusting section and can realize that the sensitivity of load descends by hydraulic driving.
According to a kind of expansion structure of the present invention, regulation: the spring of spool pretension is made up of the spring of two mutual sheathing.Enough creep rupture strengths have been set up thus.
According to another kind of expansion structure of the present invention, regulation: the outer casing space that holds spring is connected with fuel tank via a passage.Although the valve section is sealed, still have leaking medium to flow in the spring housing, can discharge leaking medium by described passage.
Description of drawings
Describe the present invention in detail by means of the embodiment shown in the accompanying drawings below.
Unique accompanying drawing shows the circuti diagram that is used for to an oil hydraulic motor fuel feeding, has according to safety valve of the present invention.
Embodiment
In the accompanying drawings, at 10 places one oil hydraulic motor 10 is set, it for example will promote the load that is not shown specifically.Motor 10 is by for example three-position valve control of controller 12, and it is solenoid-operated.Not shown is the pump of motor 10 fuel feeding and affiliated fuel tank.One safety valve 14 is set between controller 12 and motor 10.A up pipeline 16 and a descending pipeline 18 are between safety valve 14 and controller 12.This up pipeline 16 leads to shell 22 the insides of valve 14 at 20 places.A spring-loaded safety check 26 is set, this inlet 20 is connected with a passage 24.This safety check seals a path 28 that leads to oil hydraulic motor 10 usually.
A spool 30 is arranged on the axial bore the inside of shell 22 movably.It has valve section 32, when it by means of spring 34,36 roof pressures of two mutual sheathing time the closed position, this valve section and the sealing seamed edge acting in conjunction in the hole of shell 22 hermetically of being joined.On alms bowl shape bearing 38, it leans on the right part, inside of the spring housing 40 in shell 22 described spring 34,36 at the right part upper support.Spring housing is made of the shell-like parts that separate.Have spring holder 42 on the other end, it acts on the spool 30 by spheroid 44.By coil 42 and the spheroid 44 a kind of universal type that provided spool 30 load, load is only worked in the axial direction.
Axially with valve section 32 compartment of terrains, on spool 30, be provided with one and regulate sections 46, it comprises definite unshowned hole that mills out.The sealing seamed edge acting in conjunction of being joined in the hole of this adjusting section 46 and shell 22, being used for position according to spool 30, to form desired hydraulic medium through-flow.Between valve section 32 and adjusting section 46, has a ring casing 48.
The piston section 50 of the sealing guiding of spool 30 is as pre-control piston.Passing through pipeline 54 in the face of the cylinder chamber 52 of piston section 50 is connected with pipeline 18.First throttle valve 56 is arranged in pipeline 54, and this throttle valve is connected on the shunt circuit of another throttle valve 58 and a safety check 60.Connect the 3rd throttle valve 62 on this shunt circuit, it is connected with a passage 66 by safety check 64.This passage also is connected with spring housing 40.If with closing cock precession passage the inside (not shown), then by this connection.So just spring housing 40 is connected with fuel tank via another connection.
Adjust screw 70 by sealing spiral precession shell 22 the insides for one, and general and piston section 50 has an interval.If continue to screw in but adjust screw, can make spool 30 adjust to open position (emergency descent) in this way.Another is adjusted screw 72 and enters shell 22 the insides and lean on bearing 38 at an opposed sidespin, can adjust pre-power on the spool 30 by means of adjusting screw 72 thus.
The working method of above-mentioned underground is as follows.In service in rising, make pressure medium be transported to oil hydraulic motor 10 by controller, pipeline 16, passage 24, safety check 26 and path 28 by unshowned pump.When course of conveying finished, this safety check 26 also was used for keeping load.When oil hydraulic motor 10 moved on the contrary for the purpose that descends, pumping pressure was present in the cylinder chamber by throttle valve 56 and safety check 60 and piston section 50 reacts on spring 34,36 and adjusts spool 30 to the right.The minimum adjustment of spool 30 causes opening valve section 32, just obtains tank pressure in ring casing 48 thus.This ring casing 48 is connected with an annular groove 78 by the hydraulic channel 76 that is not shown specifically, and this annular groove is arranged between ring sealing 80 and the path 28.This ring sealing 80 seals piston section 50 with respect to path 28.By in ring casing 48, having tank pressure, this pressure also is present in the annular groove 78.Make ring sealing 80 unloadings in this way, and can make spool continue delicately to adjust opening on the direction, wherein, the adjusting section 46 of spool 30 is responsible for realizing that desired hydraulic medium is through-flow, and hydraulic medium enters into the inlet/outlet 20 of valve housing 22 and flow back into fuel tank by pipeline 16 and controller therefrom from ring casing.
Connecting an excess pressure valve 82 on pipeline 18, it is for example opened when pressure is higher than 120bar.
The medium that refluxes can be at the fuel tank that directly flow back in service that descends.At this moment, in spring housing, exist stagnation pressure.Guarantee thus: when the pipeline between controller 12 and the valve 14 disconnected, rate of descent can not strengthen in unallowed mode.
Claims (5)
1. deadweight safety valve comprises: a valve housing; One makes fluid pressure drive device and the direct-connected path of controller in shell, described path is connected with the joint of controller side and with the joint of driving side; Also comprise: a safety check of in described path, opening towards fluid pressure drive device; Control guiding valve in shell, it has a valve section, described valve Duan Zaiqi open position discharges being connected between the joint of the joint of a driving side and controller side described safety check of cross-over connection, that be parallel to described path, wherein, this valve section is being opened by a spring adjustment on the closing direction on the direction by a pre-control piston adjustment, and this acting surface controlling piston in advance is loaded pilot pressure; Also comprise: one coefficient in the adjusting section of controlling on the guiding valve with the shell seamed edge, as long as described valve section is opened, it is through-flow that this regulates one of section release, wherein, a ring sealing in shell makes described pre-control piston seal with respect to described path, it is characterized in that, is provided with
-one in shell (22) valve section (32) and regulate between the section (46) ring casing (48) and
-one annular groove (78) between ring sealing (80) and path (28), it is connected with described ring casing (48) via a passage (76).
2. safety valve as claimed in claim 1 is characterized in that, described spring has the spring (34,36) of two mutual sheathing, and they act on control guiding valve (30) by a dish (42) and a ball (44).
3. safety valve as claimed in claim 1 is characterized in that, described spring has the spring (34,36) of two mutual sheathing, and they act on control guiding valve (30) by a dish (42) and a ball (44).
4. safety valve as claimed in claim 1 is characterized in that, a space (40) that holds spring of shell (22) is connected with fuel tank via a passage, and this space this moment (40) is to seal in addition.
5. as each described safety valve in the claim 1 to 3, it is characterized in that, in shell (22), be provided with one first and adjust screw (70), can adjust spool (30) by it and open valve section (32).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100856799A CN101260897B (en) | 2007-03-06 | 2007-03-06 | Hydraulic safety valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100856799A CN101260897B (en) | 2007-03-06 | 2007-03-06 | Hydraulic safety valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101260897A true CN101260897A (en) | 2008-09-10 |
| CN101260897B CN101260897B (en) | 2010-12-29 |
Family
ID=39961530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007100856799A Expired - Fee Related CN101260897B (en) | 2007-03-06 | 2007-03-06 | Hydraulic safety valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101260897B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110832239A (en) * | 2017-06-09 | 2020-02-21 | 萨尔瓦托雷·布福 | Safety valve for a hydraulic system |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2833971C2 (en) * | 1978-08-03 | 1984-07-19 | Wessel-Hydraulik Günther Wessel, 2940 Wilhelmshaven | Line break safety device for arrangement between a hydraulic control unit and at least one working cylinder |
| DE3225132C2 (en) * | 1981-07-11 | 1995-08-17 | Beringer Hydraulik Ag Neuheim | Hydraulic safety brake valve |
| DE3234496A1 (en) * | 1982-09-17 | 1984-03-22 | Wessel-Hydraulik Günther Wessel, 2940 Wilhelmshaven | Hydraulic safety valve |
| DE4032420C2 (en) * | 1990-10-12 | 1994-04-14 | Wessel Hydraulik | Hydraulic safety valve |
| DE4446145A1 (en) * | 1994-12-23 | 1996-06-27 | Bosch Gmbh Robert | Hydraulic control in monoblock design for lifting and lowering a load with at least two electromagnetically actuated proportional directional control valve elements |
| DE19641540C2 (en) * | 1996-10-09 | 2002-01-03 | Wessel Hydraulik | Hydraulic safety valve |
-
2007
- 2007-03-06 CN CN2007100856799A patent/CN101260897B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110832239A (en) * | 2017-06-09 | 2020-02-21 | 萨尔瓦托雷·布福 | Safety valve for a hydraulic system |
| CN110832239B (en) * | 2017-06-09 | 2022-03-04 | 萨尔瓦托雷·布福 | Safety valve for a hydraulic system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101260897B (en) | 2010-12-29 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101229 Termination date: 20170306 |