CN1031595C - Valve apparatus - Google Patents
Valve apparatus Download PDFInfo
- Publication number
- CN1031595C CN1031595C CN89102953A CN89102953A CN1031595C CN 1031595 C CN1031595 C CN 1031595C CN 89102953 A CN89102953 A CN 89102953A CN 89102953 A CN89102953 A CN 89102953A CN 1031595 C CN1031595 C CN 1031595C
- Authority
- CN
- China
- Prior art keywords
- valve
- spool
- nozzle
- valve seat
- contact segment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 description 9
- 230000014509 gene expression Effects 0.000 description 6
- 230000009467 reduction Effects 0.000 description 4
- 238000005530 etching Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K25/00—Details relating to contact between valve members and seats
- F16K25/04—Arrangements for preventing erosion, not otherwise provided for
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
- Lift Valve (AREA)
Abstract
To decrease a differential pressure between a valve unit in its valve seat part and an orifice in its seat surface part thus preventing generation of cavitation by throttling a controlled material being dispersed by two or more circumferential fitting parts in a fine opening region. A seat part 9 is provided between a valve unit 15 of a plug collective unit 10 in its uppermost upstream side and an orifice 6 in the uppermost upstream side of the orifices of a seat ring 5, while a circumferential fitting part 15 is provided neighboring to said seat part 9. Further circumferential fitting parts 16, 17, serving as the throttle part in a fine opening condition, are provided between valve units 12, 13 in the downstream side and orifices 7, 8 in the downstream side.
Description
The present invention relates to a kind of control valve unit, it comprises that one axially has the seat ring of a plurality of valve nozzles at it.
Usually, in control valve unit such as modulating valve, when a kind of liquid as controlled fluid controlled when having big pressure difference, owing to air pocket will occur in the import of valve and the variation in pressure in outlet port.Spool be subjected to local etching with valve seat contact segment and valve base surface, thereby make the function of valve often impaired.In this case, people have taked the multiple counter measure.
Disclosed a kind of valve for general use device is exactly the valve that adopts this type in the Japan Patent that waits to examine 61-31772 number.
In this general control valve unit, be hampered by at fluid during the closed condition of control valve unit, in order to reduce leakage, be provided with a kind of multi-step pressure reduction part in valve seat and valve seat contact segment, it is made up of the adjusting parts that valve nozzle and large diameter spool partly constitute.But these control valve unit down periods, valve seat part generally speaking has the flow control effect, tends to occur air pocket like this between the little valve degree of opening internal valve seat contacting part and valve seat surface.This is owing in little opening in the valve degree, define minimum clearance between valve seat surface spool and valve seat contact segment and corresponding valve nozzle.When foreign matter was sandwiched between valve seat contact segment and the valve seat surface along with closing of valve, this phenomenon was particularly evident.As a result, spool be subjected to local etching with valve seat contact segment and valve base surface, or produce noise, so that can not make valve keep stable over a long time service behaviour.
The present invention has considered said circumstances, the purpose of this invention is to provide a kind ofly can prevent being corroded with valve seat contact segment and valve seat surface of spool, can also eliminate generating noise in opening the valve degree for a short time, thereby make valve keep stable service behaviour over a long time.
Control valve unit according to the present invention is a kind of to being contained in the improvement of the adjusting parts in the valve casing, the time difference that cooperates and break away from the valve seat contact segment of spool between wherein the large-diameter portion of valve nozzle and spool is divided is given, the axial dimension of valve nozzle and major diameter part increases from the upstream side to the downstream side gradually, so that throw off contact in the control valve unit open operation process.
According to the present invention, little opening under the valve degree, although valve seat part does not keep closing, the multi-step pressure reduction that is grouped into by valve seat and large-diameter portion partly keeps in touch state.When valve is opened gradually, disengage earlier from valve seat part decompression part farthest.
Describe technological scheme of the present invention in detail in conjunction with an illustrated embodiment.
Below accompanying drawing is done simple declaration:
Fig. 1 and Fig. 2 represent respectively according to control valve unit of the present invention at sectional view little, different opening state;
Fig. 3 is the sectional view of expression whole control valve unit of the present invention.
Below by consulting the accompanying drawing illustrative embodiments, describe the solution of the present invention in detail.
Referring to Fig. 1 to Fig. 3, reference number 1 has indicated a cylindrical shape valve shell.Article one, the liquid opening 2 that links with downstream line takes shape in the shell wall of valve shell 1.Body that links with a upstream line (not shown) of reference number 3 expressions.Body 3 is fixed on the valve shell 1, and adpting flange 4 forms in two ends of body 3.Cylinder of reference number 5 expressions, it and upstream and downstream pipeline (not shown) link.Cylinder 5 is bearing on the end face of flange 4a of body 3, and the each several part of this cylinder 5 is valve casing 1 inner the extension.Axially form three valve nozzles 6 to 8 along cylinder 5 with predetermined interval; Upstream extremity valve nozzle 6; Promptly valve nozzle bottom has a valve seat surface 9, can place spool on it with valve seat contact segment (back explanation).The valve rod body that reference number 10 expressions have three major diameter parts 11 to 13 of the flow channel 6a to 8a that is used to out/closes valve nozzle 6 to 8.Valve rod body 10 can be along the axially reciprocating of cylinder 5.The major diameter part 11 to 13 of valve rod body 10 has conical flow control part 11a to 13a respectively.Upstream extremity major diameter part 11 in the major diameter part 11 to 13 has one in sit idly spool contact segment 14 on valve seat surface 9 of valve down periods.Annular flow control section 15 takes shape between the flow channel 6a of the flow control part 11a of major diameter part 11 and valve nozzle 6, and this path 6a has the ring surface of basic identical diameter.Equally, annular flow control section 16 and 17 takes shape in the flow control part 12a and the 13a of downstream major diameter part 12 and 13 respectively, and between the flow channel 7a and 8a of downstream valve nozzle 7 and 8, this path 7a, 8a has the ring surface of substantially the same diameter.Annular flow control section 15,16 and 17 is used as constriction respectively in little opening under the valve state.Limit spool contact segment 14 by spool part 18 and valve seat surface 9 between the valve nozzle 6 of upstream extremity major diameter part 11 and upstream, it is as the fluid stop part.Guide cylinder on the continuous cylindrical shape of one of reference number 19 expression and cylinder 5, it is fixed on the valve shell 1, is used to valve rod body 10 to lead.Have on the annular wall of guide cylinder 19 by leading to outside liquid flow hole 19a in the guide.One of reference number 20 expression has positioning disk under the annular of liquid flow hole 20a, controlled fluid this hole of flowing through.Following positioning disk 20 places between cylinder 5 and the body 3, so that with upper conduit 19 pilot valve cylinder 10 together.Notice that it is because P that liquid stream flows by arrow direction among Fig. 3
1-P
2Due to the pressure difference of=P (＞0).
This valve core part 18 open valve size l
1Fit dimension l with major diameter part 13 and 12
2And l
3Meet the following conditions, wherein these are of a size of and are from upstream to the downstream side and increase (l gradually in opening the valve process
1＜l
2＜l
3).
In having the control valve unit of such scheme, the spool contact segment 14 of valve rod body 10 is in valve seat surface 9 in first valve nozzle 6 and closely contacts opening valve operation period, and flow control part 15 is set at zero opening state.Therefore, fluid does not flow.Consult Fig. 1 and describe the little valve degree of opening in detail.Though the valve seat surface 9 of first valve nozzle is separated with spool contact segment 14, be in engagement corresponding to 13 of the major diameter part 12 of the second and the 3rd valve nozzle 7 and 8.Specifically, because the 3rd valve nozzle 8 has maximum length of thread engagement, then provide maximum flow resistance.Difference between pressure successively is presented as in the 3rd valve nozzle maximum in the first valve nozzle minimum at each valve nozzle.
Therefore, according to the present invention, the dividing potential drop at valve seat 18 places can be reduced in the valve degree in little the opening that is easy to generate air pocket, thereby can prevent the air pocket between the valve seat surface 9 of the spool contact segment 14 of major diameter part 11 and valve nozzle 6, and can eliminate in valve seat part 18 and produce noises.
When this control valve unit was further opened, major diameter was partly thrown off the second and the 3rd valve nozzle by specified order.In this process, the fluid flow rate that flows through control valve unit increases gradually, but the pressure difference between valve nozzle remains unchanged.Therefore, spool part 18 is not easy to be subjected to the influence of fluid worst case.
The centre or big opening under the valve state, because controlled fluid by valve nozzle 6 to 8, is shunk in general device in the same manner with being assigned with, therefore the pressure reduction at spool part 18 places does not increase.In this case, if set equally mutually at the Pressure reducing ratio at valve nozzle 6 to 8 places, between downstream valve nozzle 8 and the downstream spool 13 air pocket will appear so.So,, and the pressure reduction of downstream constriction is reduced preferably by change flow coefficient (circulation area between flow control part and the seat ring).
Among the present invention, the number of valve nozzle is not limited to three valve nozzles 6 to 8 used among the embodiment.Such as, this number can be decided to be 2,4,5 ..., also can decide as required.In the case, closing the size that needs from the upstream side to the downstream side, to increase gradually downstream annular mating part in the closed procedure by the control valve unit in the foregoing description.
As mentioned above, according to the present invention, little opening under the valve degree, by annular control section make controlled fluid by shrinking distributively so that reduce differential pressure between the valve seat surface of the valve seat contact segment of spool and valve nozzle.Owing to prevented from air pocket to occur at the valve seat place by this way, just can prevent that spool contact segment and valve seat surface from being corroded, but also eliminate, thereby can make valve keep stable performance for a long time at valve seat part generation noise in little opening under the valve degree.According to the present invention, special because the axial dimension (contracted length) of annular mating part is to increase gradually from the upstream side to the downstream side, therefore can easily set, and can reduce reliably in the differential pressure of valve seat part in the differential pressure at each valve nozzle place.
Claims (1)
1. a control valve unit has:
One valve rod body (10) is provided with several major diameters parts (13,12,11) and the taper flow control section that is close to (13a, 12a, 11a);
One cylinder (15) is provided with some valve nozzles (8,7,6) and control section, and (13a, 12a 11a) cooperatively interact and form annular flow control section (17,16,15); Also be provided with liquid entrance (19a, 20a);
The valve seat surface (9) of valve nozzle (6) and spool part (18) limit spool contact segment (14);
The valve nozzle (6) of above-mentioned cylinder (5) is corresponding to the major diameter part (11) of upstream side, and when valve cut out, above-mentioned spool contact segment (14) contacted with the valve seat surface (9) of valve nozzle (6);
It is characterized in that:
Spool part (18) open valve size l
1Fit dimension l with major diameter part (13,12)
2And l
3Meet the following conditions, promptly in opening the valve process, these are of a size of from the upstream side to the downstream side increases gradually (l
1＜l
2＜l
3).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP108292/88 | 1988-04-30 | ||
| JP63108292A JPH01279187A (en) | 1988-04-30 | 1988-04-30 | Valve device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1037383A CN1037383A (en) | 1989-11-22 |
| CN1031595C true CN1031595C (en) | 1996-04-17 |
Family
ID=14480978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN89102953A Expired - Lifetime CN1031595C (en) | 1988-04-30 | 1989-04-29 | Valve apparatus |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH01279187A (en) |
| KR (1) | KR930006513B1 (en) |
| CN (1) | CN1031595C (en) |
| IN (1) | IN170729B (en) |
-
1988
- 1988-04-30 JP JP63108292A patent/JPH01279187A/en active Pending
-
1989
- 1989-04-24 IN IN315/CAL/89A patent/IN170729B/en unknown
- 1989-04-28 KR KR1019890005647A patent/KR930006513B1/en not_active IP Right Cessation
- 1989-04-29 CN CN89102953A patent/CN1031595C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1037383A (en) | 1989-11-22 |
| JPH01279187A (en) | 1989-11-09 |
| IN170729B (en) | 1992-05-09 |
| KR930006513B1 (en) | 1993-07-16 |
| KR890016318A (en) | 1989-11-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent of invention or patent application | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: PATENTEE; FROM: YAMATAKE-HONEYWELL CO., LTD. TO: YAMATAKE CORP. |
|
| CP01 | Change in the name or title of a patent holder |
Patentee after: Yamatake Corp. Patentee before: Yamatake-Honeywell Co., Ltd. |
|
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| OR01 | Other related matters | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |