CN107304845B - A kind of automatic control return valve bypassing No leakage - Google Patents
A kind of automatic control return valve bypassing No leakage Download PDFInfo
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- CN107304845B CN107304845B CN201610239234.0A CN201610239234A CN107304845B CN 107304845 B CN107304845 B CN 107304845B CN 201610239234 A CN201610239234 A CN 201610239234A CN 107304845 B CN107304845 B CN 107304845B
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- valve
- bypass
- main road
- head
- automatic control
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Classifications
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- 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
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/10—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit
- F16K11/105—Three-way check or safety valves with two or more closure members
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- 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
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- 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/52—Means for additional adjustment of the rate of flow
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- 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
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/025—Check valves with guided rigid valve members the valve being loaded by a spring
- F16K15/026—Check valves with guided rigid valve members the valve being loaded by a spring the valve member being a movable body around which the medium flows when the valve is open
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- 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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0209—Check valves or pivoted valves
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- 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
- F16K47/08—Means in valves for absorbing fluid energy for decreasing pressure or noise level and having a throttling member separate from the closure member, e.g. screens, slots, labyrinths
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
- Lift Valve (AREA)
Abstract
The invention belongs to a kind of automatic control return valves for bypassing No leakage, and in particular to a kind of bypass for being suitable for liquid medium can be carried out the automatic control return valve of sealing.Purpose is to solve the problems, such as to bypass to have the gap always in automatic control return valve application process to flow leakage, and valve body is the T-shaped structure of integral type threeway, is equipped with two main road, bypass valve chambers；Valve body upper end is equipped with support plate, and main road check-valves is equipped between valve body and support plate；Main road check-valves is positioned by guide rod swivel nut；Valve body is provided with pilot sleeve, and bypass valve seat is fixed on pilot sleeve, and valve head is connected with valve rod, and valve rod upper end is equipped with valve rod and adjusts head, adjusts the adjusting that head realizes bypass maximum stream flow by valve rod.The minimum discharge that the present invention is suitable for industrial centrifugal pump protects occasion; main, bypass changeover can be carried out automatically according to technique flow demand; and bypass maximum stream flow can carry out on-line control with the variation of technological parameter, the waste to avoid unnecessary recirculating mass to pump power.
Description
Technical field
The invention belongs to automatic control return valve technical fields, and in particular to a kind of bypass for being suitable for liquid medium can be carried out close
The automatic control return valve of envelope.
Background technique
Pump discharge installation protection valve, when pump operation is in big flow state, protection valve main road non-return valve core is opened, and bypass is closed
It closes, flow is all exported by main road and is discharged；When pump operation is in small flow status, main road non-return valve core is closed, and bypass is opened, stream
Amount is all discharged by Bypass outlet.Realize that main road and bypass are switched over the variation of technique flow.
Existing pump-protecting valve is a kind of T-shaped structure triple valve, and shell usually passes through flange in main road by upper and lower two parts
Couple with gasket, fastener, casing upper half packing has guide rod swivel nut, and shell lower half portion is equipped with main road, bypass two
A valve chamber, and equipped with bypass sleeve, main road non-return valve core is installed between guide rod swivel nut and bypass sleeve, in top half shell
Main road spring is equipped between body and main road non-return valve core, main road non-return valve core lower part is to open foraminate sleeve, is stopped by main road
The movement for returning spool drives perferated thimble movement to realize main bypass changeover.The type pump-protecting valve has following defects that
1) between main road non-return valve core sleeve and bypass sleeve with being combined into clearance fit, main road fluid can be by gap
Enter bypass, bypasses have the gap flow problem always in use.
2) by after the completion of given parameters aperture, bypass flow cannot carry out sleeve according to the variation of pump parameter and technological parameter
On-line control.
3) shell is divide into upper part and lower part, and needs to be sealed in middle flange, and compressed with fastener.For high temperature,
The bad working environments such as high pressure, low temperature, there are the risks of middle flange leakage, and large bore valves maintenance is difficult.
4) valve body wall unevenness is caused on valve body in the throttling shape face of main road non-return valve core, and difficulty of processing is larger, to make
The manufacturing cycle of whole deck valve door extends.
In view of the above problem present in automatic control return valve technical solution in the prior art, need to have developed a kind of be suitble to
It can be carried out the automatic control return valve of sealing in the bypass of liquid medium, to solve the above problems.
Summary of the invention
The object of the present invention is to provide the automatic control return valves that a kind of bypass for being suitable for liquid medium can be carried out sealing.
In order to realize the purpose, the technical solution adopted by the present invention is as follows:
A kind of automatic control return valve bypassing No leakage, valve body are three way type T-type structure, and connection main road import is equipped in valve body
With the main road valve chamber of main road outlet and connect the bypass valve chamber of main road import and bypass outlet；The upper end of valve body is equipped with support plate,
Between support plate and valve body be clearance fit, support plate by soket head cap screw be fixed on valve body main road export and use gasket into
Row sealing；Guide rod swivel nut is mounted in support plate by clearance fit, and one of with the following methods fixed: flange riveting,
Welding；It is equipped with main road valve seat in valve body, main road non-return valve core is installed between valve body and support plate；Main road non-return valve core passes through
It is oriented to and is suspended on main road valve seat with the clearance fit of guide rod swivel nut；Guide rod swivel nut and the epicoele of main road non-return valve core are provided with
Main road spring；Valve body is provided with pilot sleeve, and pilot sleeve and valve body are clearance fit, and are fixed on valve body by holding screw
Bypass valve it is intracavitary, bypass valve seat be fixed on pilot sleeve；Bypassing valve seat and pilot sleeve is interference fit, and when assembly bypasses
Valve seat cold charge is fitted in pilot sleeve, this fit clearance is sealed by sealing ring one；After valve rod is connected with by-passing valve valve head
Across pilot sleeve, the upper end of valve rod adjusts head with valve rod and connects；The outer diameter that valve rod adjusts head is greater than the interior of pilot sleeve head
Diameter, valve rod adjust head suspension on pilot sleeve by valve rod；The length that head regulating valve stem is adjusted by valve rod makes to bypass standard-sized sheet
The orifice size that valve seat is bypassed under state changes, and is being to bypass maximum stream flow according to the variation of pump parameter and technological parameter
Be adjusted in the range of system setting, the bypass of the automatic control return valve of original structure after processing is completed, can not according to pump parameter and
The variation on-line control of technological parameter bypasses maximum stream flow.
Further, a kind of automatic control return valve bypassing No leakage as described above, in which: between valve body and bypass valve body
Multi-step pressure reduction orifice plate is installed, bypass can depressurize form by multistage orifice plate and bear higher bypass pressure difference, be adapted to higher head
The minimum discharge of pump protects occasion.
Further, a kind of automatic control return valve bypassing No leakage as described above, in which: main road non-return valve core and guiding
The gap of sleeve is sealed by sealing ring two, and sealing ring two is fixed by retaining ring and baffle；Realize main road valve chamber and
The completely isolated of valve chamber is bypassed, clearance leakage problem is not present.
Further, a kind of automatic control return valve bypassing No leakage as described above, in which: the upper end of valve rod and valve rod tune
Connection type between section header is one of following manner: internal screw thread connection, external screw thread connection, pin connection.
Further, a kind of automatic control return valve for bypassing No leakage as described above, in which: by-passing valve valve head and valve rod it
Between connection type be one of following manner: riveting, welding, pin connection；Above-mentioned connection type is riveting, pin connection
When one of mode, the fit clearance sealing ring one of by-passing valve valve head and valve rod is sealed.
Further, a kind of automatic control return valve bypassing No leakage as described above, in which: the valve rod, by-passing valve valve
Without mechanical attachment driving between head, the dielectric fluid power drive in automatic control return valve is fully relied on, based on the perseverance of hydraulic power direction
Road opening direction, valve rod permanent out-of-balance force with main road opening direction during valve working.
Further, a kind of automatic control return valve bypassing No leakage as described above, in which: be arranged on main road check-valves
It adjusts shape face one and adjusts shape face two, reduce the difficulty of processing for adjusting shape face.
Further, a kind of automatic control return valve for bypassing No leakage as described above, in which: the valve rod adjust head with
Main road non-return valve core separates after bypass completely closes, and the further unlatching for not influencing main road non-return valve core is closed in bypass, makes
The control of automatic control return valve main road crushing is in the range of technique allows.
The beneficial effect of the present invention compared with the prior art is:
1. the present invention solves original pump protection by using the by-passing valve valve head for power drive of surging, the brand new of valve rod
Valve is gap-matched the problem of being difficult to realize sealing, realizes valve working and bypasses No leakage in the process.
In addition, realize main, bypass valve chamber inside pump-protecting valve because solving the leakage problem of bypass and be kept completely separate,
Guarantee valve rod reliable in action.
2. the present invention adjusts head by valve rod and shaft length is adjusted, the orifice size of bypass valve seat can be carried out
Adjust, realize after processing is completed bypass maximum stream flow a certain range in can on-line control, original structure automatic control return valve bypass
After processing is completed, bypass maximum stream flow can not be adjusted.
3. throttling shape face is placed on main road non-return valve core by the present invention, shape face difficulty of processing is reduced.
4. valve body of the present invention are integral type, middle flange sealing element and fastener are eliminated, middle flange leakage risk is reduced,
And release support plate screw just can easily tear valve open, maintenance is convenient.
5. the axial movement of valve rod of the present invention is completely dependent on hydraulic power provided by medium, and hydraulic power direction always based on
Road opening direction enables valve rod to follow the opening and closing campaign of main road non-return valve core closely, to ensure that the accurate switching of main bypass.
6. in the present invention by-passing valve valve head and bypass valve seated connection after touch, by hydraulic power as sealing force, to make to bypass close
Envelope is reliable.
7. the inhibition after bypass completely closes in the present invention due to by-passing valve valve head by valve seat makes valve rod can not
It continues starting and rises with main road non-return valve core, valve rod adjusts head and separates with main road non-return valve core, and the closing of bypass will not influence
The further unlatching of main road non-return valve core, so that the main road crushing of automatic control return valve can control when running normal process flow
Within the scope of technique allows.
8. the type of attachment of automatic control return valve bypass outlet is flexible in the present invention, there are studding, flanged joint and bypass bore
The bypass No leakage automatic control reflux valve arrangement with flange in bypass being designed can be required according to user.
9. bypass can depressurize form by the multistage orifice plate of application and bear higher bypass pressure difference in the present invention, make itself while
It is adapted to the minimum discharge protection occasion of higher head pump.
10. automatic control reflux valve chest can be made into two kinds of forms of casting and forging according to user demand in the present invention, thus
Larger technical advantage is highlighted in the case that non-standard de-sign and duration are relatively tight.Wrought form shell preferentially uses integral structure,
If user has specific demand or bore very little, when integral valve body is difficult to, can also be made into double-body bike, flexible structure is changeable.
11. the connection of valve rod and by-passing valve valve head has the diversified forms such as welding, riveting, thread connection in the present invention,
It can specifically be chosen by duty requirements.
It is adjusted 12. bypassing maximum stream flow in the present invention and can adjust head change shaft length by valve rod, with valve
Pole length variation, valve seat orifice size (Section A-A in Fig. 5) change, so that bypass maximum stream flow be made to change therewith.Valve rod
Adjusting head has the forms such as screw thread (internal or external) form and the adjustable slot pin connection of gear, their common feature is: when logical
It overregulates screw thread or when slot pin keeps valve rod overall length elongated, valve seat orifice size becomes larger, and bypass maximum stream flow becomes larger, otherwise reduces.
13. bypass check valve is built-in in the present invention, and is not limited by bypass structure.
Detailed description of the invention
Fig. 1 studding form bypasses No leakage automatic control return valve structural schematic diagram；
Fig. 2 bypasses full-gear and bypasses No leakage automatic control return valve schematic diagram；
Bypass No leakage automatic control return valve schematic diagram when Fig. 3 switching state；
The bypass No leakage automatic control return valve schematic diagram of Fig. 4 main road full-gear；
Fig. 5 bypasses maximum stream flow and adjusts schematic diagram；
The bypass No leakage automatic control return valve structural schematic diagram of Fig. 6 bypass flange connection；
The bypass No leakage automatic control return valve structural schematic diagram of flange in the bypass of Fig. 7 band；
Bypass No leakage automatic control return valve structural schematic diagram of the Fig. 8 with multi-step pressure reduction structure；
The bypass No leakage automatic control return valve structural schematic diagram of Fig. 9 integral type forging shell；
The bypass No leakage automatic control return valve structural schematic diagram of Figure 10 double-body bike forging shell；
Figure 11 rivets form valve rod by-passing valve valve head structural schematic diagram；
Figure 12 welding form valve rod by-passing valve valve head structural schematic diagram；
Figure 13 pin type of attachment valve rod by-passing valve valve head structural schematic diagram；
Figure 14 internal screw thread valve rod adjusts capitiform formula schematic diagram；
Figure 15 external screw thread valve rod adjusts capitiform formula schematic diagram；
Figure 16 slot pin valve rod adjusts capitiform formula schematic diagram；
The No leakage automatic control return valve built in bypass non-return structure schematic diagram of flange in the bypass of Figure 17 band；
The No leakage automatic control return valve built in bypass non-return structure schematic diagram of Figure 18 bypass flange connection.
In figure: 1 valve body, 2 main road non-return valve cores, 3 guide rod swivel nuts, 4 support plates, 5 main road springs, 6 pilot sleeves, 7 bypasses
Valve seat, 8 by-passing valve valve heads, 9 valve rods, 10 sealing rings one, 11 holding screws, 12 soket head cap screws, 13 gaskets, 14 sealing rings
Two, 15 baffles, 16 valve rods adjust head, 17 retaining rings, 18 band bypass outlet flange valve bodies, 19 sealing rings three, 20 bypass valve bodies, 21 spiral shells
Mother, 22 studs, 23 pressure reducing orifices, 24 integral types forge valve body, 25 control casings, 26 upper valve bodies, 27 lower valve bodies, 28 built-in controls
Casing, 29 bypass check valve seats, 30 restricting orifices, 31 bypass springs, 32 bypass bushings, 33, which adjust shape face one, 34, adjusts shape face
Two.
Specific embodiment
With reference to the accompanying drawing to it is proposed by the present invention it is a kind of bypass No leakage automatic control return valve be described further:
As shown in Figure 1, a kind of automatic control return valve for bypassing No leakage, valve body 1 is three way type T-type structure, is equipped in valve body
Main road valve chamber that connection main road import and main road export and the bypass valve chamber for connecting main road import and bypass outlet.4 He of support plate
It is clearance fit between valve body 1, and is fixed on the outlet of 1 main road of valve body with soket head cap screw 12 and is sealed with gasket 13.
Guide rod swivel nut 3 is mounted in support plate 4 by clearance fit, and is fixed with the mode of flange rivet or weld.It is equipped in valve body 1
Main road valve seat, main road non-return valve core 2 with the clearance fit of guide rod swivel nut 3 by being oriented to and being suspended on main road valve seat.Guide rod spiral shell
Set 3 and the epicoele of main road non-return valve core 2 are provided with main road spring 5.Pilot sleeve 6 and valve body 1 are clearance fit, and pass through tightening
The bypass valve that screw 11 is fixed on valve body 1 is intracavitary.The gap of 2 cavity of resorption of main road non-return valve core and pilot sleeve 6 passes through sealing ring two
14 are sealed (see Figure 11~13), and sealing ring 2 14 is fixed by retaining ring 17 and baffle 15.Bypass valve seat 7 and guide sleeve
Cylinder 6 is interference fit, and bypass 7 cold charge of valve seat is fitted in pilot sleeve 6 when assembly, this fit clearance carries out close by sealing ring 1
Envelope.Valve rod 9 and by-passing valve valve head 8 passed through after being connected pilot sleeve 6 and valve rod adjust head 16 by internal screw thread (Figure 11),
External screw thread (Figure 12) or pin connection (Figure 13) are greater than 6 head internal diameter of pilot sleeve, valve rod since valve rod adjusts 16 outer diameter of head
Head 16 can be adjusted by valve rod to be suspended on pilot sleeve 6.Riveting (Figure 14) can be used in by-passing valve valve head 8 and valve rod 9,
The forms such as welding (Figure 15) and pin connection (Figure 16) can be used, for riveting and pin type of attachment, by-passing valve valve head 8 and valve
The fit clearance of bar 9 need to be sealed with sealing ring 1.
A kind of automatic control return valve as described above, in which: the shell can be made into casting and forging according to user demand
Form.Wrought form shell preferentially uses integral structure, if user has specific demand, can also be made into double-body bike, structure spirit
Work is changeable.
As shown in figure 14, the gap between main road non-return valve core 2 and pilot sleeve 6 is sealed using sealing ring 2 14, sealing
It is fixed by baffle 15 and retaining ring 17 to enclose 2 14.
Without mechanical attachment driving between the valve rod 9, by-passing valve valve head 8, the medium in automatic control return valve is fully relied on
It surges power drive, hydraulic power direction perseverance is main road opening direction, and valve rod 9 is permanent during valve working to have main road opening direction
Out-of-balance force.Before pump startup, the hydraulic power acted on 8 valve rod 9 of by-passing valve valve head is zero, and valve rod adjusts head 16 to be stopped with main road
It returns spool 2 to separate, valve rod adjusts head 16 and separates after bypass completely closes with main road non-return valve core 2, falls in pilot sleeve 6
On, it is seen that valve rod adjusts head 16 and not only acts as the effect for adjusting bypass maximum stream flow, also acts as valve rod 9 when preventing termination of pumping and falls out
The further unlatching for not influencing main road non-return valve core 2 is closed in the effect of valve chamber, bypass, and the control of automatic control return valve main road crushing is made to exist
In the range of technique allows.
As shown in Fig. 2, when automatic control return valve main road outlet downstream regulating valve is closed, flowing through main road check-valves after pump startup
It is zero that core 2, which adjusts shape face 1 and adjusts the flow in shape face 2 34, and the hydraulic power acted on main road non-return valve core 2 is also zero,
Main road non-return valve core 2 is pressed in master by main road spring force (there are also the effects of 2 gravity of main road non-return valve core when valve vertical is installed)
On the valve seat of road, main road non-return valve core aperture (H in Fig. 3, Fig. 4) is zero, and valve main road channel is closed, and guarantees the close of valve main road
Envelope, by-passing valve valve head 8 move under the action of out-of-balance force to bypass closing direction, withstand master until valve rod adjusts 16 upper end of head
2 cavity of resorption of road non-return valve core, by-passing valve valve head 8 is no longer moved to bypass closing direction at this time, and bypass flow reaches maximum, valve shape
State fully opens main road for bypass and completely closes.Flow needed for valve main road flow namely technique is zero at this time, and pump discharge is whole
It is flowed back by bypass valve seat via bypass valve chamber, at this time the recycling operating condition of respective pump.
When scene pump parameter and technological parameter change, bypass maximum stream flow can adjust head 16 certain by valve rod
Adjusting of 9 length of regulating valve stem to realization to bypass 7 orifice size of valve seat (i.e. the middle section Fig. 5 A-A area) in range, for
Internal and external threads adjust capitiform formula, and it bypasses maximum stream flow Principles of Regulation are as follows: adjusts head 16 by rotating outward valve rod, makes valve rod 9
Length, to make bypass 7 orifice size of valve seat (i.e. the middle section Fig. 5 A-A area) become larger, to make to bypass max-flow quantitative change
Greatly, otherwise become smaller；Adjusting capitiform formula for slot pin, it bypasses maximum stream flow Principles of Regulation are as follows: and 9 upper end of valve rod is provided with multistage groove,
Axial interface channel is equipped between multistage groove, and valve rod adjusts the pin for having protrusion on head 16, when valve rod adjusts 16 outside grades of ditches of head
Slot is mobile and arrives self-locking along valve rod radial rotary when appropriate grade groove, 9 length of valve rod and thread forms valve rod adjusting head 16
Equally, bypass 7 orifice size of valve seat (i.e. the middle section Fig. 5 A-A area) is made to become larger, so that bypass maximum stream flow is made to become larger, it is on the contrary
Become smaller, realizes on-line control in automatic control return valve bypass maximum stream flow a certain range.
As shown in figure 3, automatic control return valve main road non-return valve core 2 by hydraulic power and spring force effect and balance, and surge
Power size is directly proportional to flow, is inversely proportional with orifice size.Throttling shape face is divided into the different two sections of orifice size, upper section section
Flow area is smaller, and lower section orifice size is larger.At the beginning of main road outlet downstream regulating valve is opened, as main road flow increases suddenly,
Due to 2 orifice size very little of main road non-return valve core at this time, hydraulic power is very big, and spring force suffered by main road non-return valve core 2 is constant, main
Road non-return valve core 2 is difficult to maintain to balance, therefore can only move along hydraulic power direction, that is, flow direction of medium, main road non-return valve core 2
Rise, throttling section A-A, which is fallen in, to be adjusted on shape face 1, and orifice size is smaller, guarantees in the lesser situation of main road flow, main
Road non-return valve core 2 can be opened smoothly, and the corresponding aperture H of main road non-return valve core 2 is as shown in Figure 3, and by-passing valve valve head 8 and valve rod 9 exist
It opens with main road non-return valve core 2 to bypass closing direction and moves under out-of-balance force effect, valve rod adjusts head 16 during this
It is remained with main road non-return valve core 2 and is close to state.Main road flow further increases, and main road non-return valve core 2 continues starting, bypass
When the upper edge of valve valve head 8 and the taper-face contact of bypass valve seat 7 (Fig. 4), bypass aperture is zero, and by-passing valve valve head 8 and valve rod 9 are no longer
Movement acts on the out-of-balance force on by-passing valve valve head 8 as hydraulic power, guarantees the sealing of bypass valve seat 7.Adjust head 16 and master
Road non-return valve core 2 will separate.Technique flow is more than or equal to the Minimum water flow of pump at this time, and pump discharge is all returned by automatic control
It flows valve main road and supplies process pipelines, bypass return flow is zero, corresponds to the critical work of the main bypass changeover of automatic control return valve at this time
Condition.
As shown in figure 4, flow needed for technique further increases, main road outlet downstream control valve opening continues to increase, with Fig. 3
Described in situation it is the same, in the case where 2 orifice size of main road non-return valve core is constant, hydraulic power increases, bullet suffered by check-valves
Spring force is constant, and main road non-return valve core 2 is difficult to maintain to balance, therefore can only be along hydraulic power direction, that is, flow direction of medium after reforwarding
Dynamic, main road non-return valve core 2 continues to rise, and throttling section A-A, which is transferred to, to be adjusted on shape face 2 34, and orifice size is larger, to make
Main road spring do not press and under the premise of compression generate enough spring forces and main road surges dynamic balance, while guaranteeing to stop in main road
It returns in the case of spool standard-sized sheet, main road flow resistance is small, so that the automatic control return valve main road pressure loss be made to control the range allowed in technique
It is interior.And by-passing valve valve head 8 and valve rod 9 can not rise due to bypassing the obstruction of valve seat 7 with main road non-return valve core 2, bypass is opened
Degree is still zero, and main road non-return valve core 2 adjusts head 16 with valve rod and separates, and (is normally at as process pipelines flow reaches set point
Near the metered flow point of pump), the aperture H of main road non-return valve core also reaches maximum.Automatic control return valve main road standard-sized sheet is corresponded at this time
Operating condition.
As shown in fig. 6, in the bypass No leakage automatic control reflux valve arrangement of bypass flange connection, automatic control reflux valve chest
I.e. the bypass of band bypass outlet flange valve body 18 is flanged joint form, is integrally cast, to adapt to the connection with bypass duct
It is required that.
As shown in fig. 7, valve body 1 passes through 21 He of nut in the bypass No leakage automatic control reflux valve arrangement with flange in bypass
The connection bypass valve body 20 of stud 22, and end face seal is carried out with sealing ring 3 19, to adapt to the diversified of bypass duct bore
Connection requirement.
Bypass can depressurize form by multistage orifice plate and bear higher bypass pressure difference, it is made to be also adapted to higher head pump
Minimum discharge protects occasion.As shown in figure 8, multi-step pressure reduction orifice plate 23 is installed between valve body 1 and bypass valve body 20, by pump discharge pressure
Power reduces to back pressure, guarantees line equipment safety, to adapt to the minimum discharge protection of higher head pump.
A kind of automatic control return valve for bypassing No leakage of the present invention, shell can be made into casting and forging shape according to user demand
Formula, to highlight larger technical advantage in the case where non-standard de-sign and duration are relatively tight.Wrought form shell preferentially uses one
Body formula structure can also be made into double-body bike if any specific demand, and flexible structure is changeable.
As shown in figure 9, opening bypass opening on integral type forging valve body 24, control casing 25, control set are penetrated by bypass aperture
Pipe 25 is welded and fixed with integral type forging valve body 24, need to guarantee the concentricity after pilot sleeve 6 is packed into when fixed, control casing 25
On be provided with bypass valve chamber, guarantee that the bypass of automatic control return valve has backflow functionality.The advantage of such automatic control reflux valve arrangement is shell
Body all forging or uses ready-made bar, with short production cycle, at low cost, especially highlighted when the duration is relatively tight and non-standard de-sign compared with
Strong technical advantage.
As shown in Figure 10, in the bypass No leakage automatic control return valve of double-body bike forging shell, automatic control flows back valve chest by upper
Valve body 26, lower valve body 27, bypass 20 three parts of valve body composition, upper valve body 26 and lower valve body 27 pass through flange and fastener in main road
Coupling, and is sealed by sealing ring 3 19, built-in control casing 28 is fixed in lower valve body 27 by bypass valve body 20, and
It is sealed by sealing ring 3 19.It is particularly suitable for small-bore forging shell or user's requirement is the field of split type forging shell
It closes.
It is built-in to bypass main road check-valves, and corresponds to different bypass structure forms, difference can be used in bypass spring 21
Mode is limited.The type of attachment of bypass outlet is flexible, has studding, flanged joint and bypass bore to be suitable for user's requirement
And the bypass No leakage automatic control return valve with flange arrangement in bypass become.
As shown in figure 17, for having the bypass No leakage automatic control return valve of flange arrangement in bypass, built in bypass stops
Valve is returned by bypass check valve seat 29, restricting orifice 30, bypass spring 31 totally three parts compositions, when installation need to be initially charged with bypass and stop
It returns to zero part and reassembles flange fastener in bypass valve body 20 and tightening bypass, bypass 31 right end of spring rises by bypass valve body limit
It is acted on to preventing medium from flowing backward back the non-return pumped by bypass duct.
As shown in figure 18, for the bypass No leakage automatic control return valve of flange in none-disk terminal, built in bypass check-valves zero
Part is all packed into from bypass outlet, is provided with radial and axial groove on valve body, built in bypass check-valves is by bypass check valve
Totally four parts form for seat 29, restricting orifice 30, bypass spring 31 and bypass bushing 32, and bypass 31 right end of spring is by bypassing bushing
32 limits, bypass bushing 32 is packed into via the axial groove on valve body and the rotary self-locking in radial groove, stops playing bypass
Prevent bypass check valve from falling while returning effect.
The minimum discharge that the present invention is suitable for industrial centrifugal pump protects occasion, can be automatic according to main road technique flow demand
Main, bypass changeover is carried out, and thoroughly closes bypass after technique flow is more than the Minimum water flow of pump, to avoid unnecessary
The waste of recirculating mass pump power solves the problems, such as that existing automatic control return valve not can be carried out bypass seal.
Claims (6)
1. a kind of automatic control return valve for bypassing No leakage, it is characterised in that:
Valve body (1) is three way type T-type structure, and main road valve chamber and connect master that connection main road import and main road export are equipped in valve body
The bypass valve chamber of road import and bypass outlet；
The upper end of valve body (1) is equipped with support plate (4), is clearance fit between support plate (4) and valve body (1), and support plate (4) passes through
Soket head cap screw (12) is fixed on valve body (1) main road and exports and be sealed with gasket (13)；
Guide rod swivel nut (3) is mounted on support plate (4) by clearance fit, and one of with the following methods fixed: flange riveting
It connects, weld；
It is equipped with main road valve seat in valve body (1), main road non-return valve core (2) are installed between valve body (1) and support plate (4)；Main road
Non-return valve core (2) with the clearance fit of guide rod swivel nut (3) by being oriented to and being suspended on main road valve seat；
Guide rod swivel nut (3) and the epicoele of main road non-return valve core (2) are provided with main road spring 5；
Valve body (1) is provided with pilot sleeve (6), and pilot sleeve (6) and valve body (1) are clearance fit, and pass through holding screw
(11) bypass valve for being fixed on valve body (1) is intracavitary, and bypass valve seat (7) is fixed on pilot sleeve (6)；
Bypassing valve seat (7) and pilot sleeve (6) is interference fit, and bypass valve seat (7) cold charge is fitted on pilot sleeve (6) when assembly
In, this fit clearance is sealed by sealing ring one (10)；
Pilot sleeve (6) are passed through after valve rod (9) and by-passing valve valve head (8) connection, the upper end of valve rod (9) and valve rod adjust head
(16) it connects；
The outer diameter that valve rod adjusts head (16) is greater than the internal diameter on pilot sleeve (6) head, and valve rod (9) adjusts head (16) by valve rod and hangs
It hangs on pilot sleeve (6)；
The length that head (16) regulating valve stem (9) are adjusted by valve rod makes to bypass the orifice size that valve seat (7) are bypassed under full-gear
It changes, bypass maximum stream flow is adjusted in the range of default according to the variation of pump parameter and technological parameter；
Multi-step pressure reduction orifice plate (23) are installed between valve body (1) and bypass valve body (20)；
Main road non-return valve core (2) and the gap of pilot sleeve (6) are sealed by sealing ring two (14), and sealing ring two (14) is logical
It crosses retaining ring (17) and baffle (15) is fixed；It realizes main road valve chamber and bypasses the completely isolated of valve chamber.
2. a kind of automatic control return valve for bypassing No leakage as described in claim 1, it is characterised in that: the upper end of valve rod (9) and
It is one of following manner that valve rod, which adjusts the connection type between head (16): internal screw thread connection, external screw thread connection, pin connect
It connects.
3. a kind of automatic control return valve for bypassing No leakage as described in claim 1, it is characterised in that: by-passing valve valve head (8) and
Connection type between valve rod (9) is one of following manner: riveting, welding, pin connection；Above-mentioned connection type is riveting
Connect, one of pin connection type when, the fit clearance of by-passing valve valve head (8) and valve rod (9) is carried out with sealing ring one (10)
Sealing.
4. a kind of automatic control return valve for bypassing No leakage as described in claim 1, it is characterised in that: the valve rod (9), bypass
Without mechanical attachment driving between valve valve head (8), the dielectric fluid power drive in automatic control return valve, hydraulic power direction are fully relied on
Perseverance is main road opening direction, valve rod (9) permanent out-of-balance force with main road opening direction during valve working.
5. a kind of automatic control return valve for bypassing No leakage as described in claim 1, it is characterised in that: in main road non-return valve core
(2) setting adjusts shape face one (33) and adjusts shape face two (34) on.
6. a kind of automatic control return valve for bypassing No leakage as described in claim 1, it is characterised in that: the valve rod adjusts head
(16) separated after bypass completely closes with main road non-return valve core (2), bypass close do not influence main road non-return valve core (2) into
One step is opened, and makes the control of automatic control return valve main road crushing in the range of technique allows.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610239234.0A CN107304845B (en) | 2016-04-18 | 2016-04-18 | A kind of automatic control return valve bypassing No leakage |
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| CN201610239234.0A CN107304845B (en) | 2016-04-18 | 2016-04-18 | A kind of automatic control return valve bypassing No leakage |
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| CN107304845B true CN107304845B (en) | 2019-07-12 |
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| CN111828679B (en) * | 2019-04-19 | 2024-08-27 | 宁波丽辰电器有限公司 | Regulating mechanism for regulating multiple outlet flow in gas valve |
| CN112539284B (en) * | 2019-09-20 | 2024-06-18 | 浙江三花商用制冷有限公司 | Flow control valve |
| CN114278633B (en) * | 2021-12-03 | 2024-05-28 | 四川航天烽火伺服控制技术有限公司 | Rotary valve |
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| US6769666B2 (en) * | 2001-11-15 | 2004-08-03 | Fisher Controls International Llc | Variable port valve plug |
| US20040217311A1 (en) * | 2003-04-29 | 2004-11-04 | Taiwan Semiconductor Manufacturing Co., Ltd. | Fully-sealing throttle valve |
| JP5196983B2 (en) * | 2007-12-18 | 2013-05-15 | 株式会社不二工機 | Flow control valve |
| CN101566235B (en) * | 2009-05-21 | 2012-12-12 | 浙江盾安人工环境设备股份有限公司 | Valve core of thermostatic expansion valve and the thermostatic expansion valve |
| CN203363276U (en) * | 2013-07-12 | 2013-12-25 | 上海市通用机械技术研究所有限公司 | Automatic return valve |
| CN104565453A (en) * | 2013-10-28 | 2015-04-29 | 北京航天动力研究所 | Self-controlled reflux valve with rotary valve as bypass structure |
| CN205155236U (en) * | 2015-11-06 | 2016-04-13 | 西安泵阀总厂有限公司 | Improved generation H type automatic recycling control valve |
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