CN103883751A

CN103883751A - Three-linkage expansion-type gate valve

Info

Publication number: CN103883751A
Application number: CN201410139611.4A
Authority: CN
Inventors: 金首广
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-04-09
Filing date: 2014-04-09
Publication date: 2014-06-25
Anticipated expiration: 2034-04-09
Also published as: CN103883751B

Abstract

The invention relates to a three-linkage expansion-type gate valve which comprises a valve body, a valve element and a valve rod. The valve rod is provided with a left valve body sealing face and a right valve body sealing face, the valve rod drives the valve element to move in the longitudinal direction, the valve element comprises a middle gate segment, a left gate segment and a right gate segment, the middle gate segment is located between the left gate segment and the right gate segment, the middle gate segment, the left gate segment and the right gate segment can move in the longitudinal direction as a whole, the middle gate segment can move relative to the left gate segment and the right gate segment in the longitudinal direction, the middle gate segment is provided with an inclined face which enables the left gate segment and the right gate segment to be expanded transversely towards two sides, and the left gate segment and the right gate segment are provided with a left gate segment sealing face and a right gate segment sealing face respectively, and the left gate segment sealing face and the right gate segment sealing face abut against and are matched with the left valve body sealing face and the right valve body sealing face in a sealed mode respectively. The gate valve has the advantages that the sealing face of the valve element and the left valve body sealing face and the right valve body sealing face do not rub with each other and do not be abraded, and close sealing is achieved.

Description

Three expansion sluice valves

Technical field

The present invention relates to a kind of gate valve, relate in particular to a kind of three expansion sluice valves.

Background technique

Existing gate valve, comprise valve body, spool and valve rod, described valve body has left and right side valve body sealing surface, valve rod band movable valve plug longitudinally-moving, that is to say valve rod band movable valve plug straight line motion, completing gate valve opens or closes, moving direction and the flow direction of spool are perpendicular, fluid can be water, steam, oil, and other flowing liquids, the deficiency of this gate valve is, valve rod band movable valve plug longitudinally-moving, when throttle down, when to be spool move toward flow direction, the sealing surface of spool will form very large friction with left and right side valve body sealing surface, and in the time of Open valve, be spool when moving away from flow direction, the sealing surface of spool also will form very large friction with left and right side valve body sealing surface, be equivalent between the sealing surface of spool and left and right side valve body sealing surface is the friction by the two, extruding, butt completes sealing, each Open valve or throttle down all cannot be avoided the phenomenon of the two friction, so in use for some time, the sealing surface of spool and left and right side valve body sealing surface will wear and tear, between the sealing surface of spool and left and right side valve body sealing surface, can form gap, thereby the sealing of gate valve is tight not, fluid is passed through from gap, gate valve cannot cut off fluid completely, cause gate valve to use, thereby the gate valve that user need to more be renewed, bring inconvenience to user, user cost improves greatly.

Summary of the invention

Technical problem to be solved by this invention is: provide a kind of sealing surface of spool and the friction of left and right side valve body sealing surface less, the sealing surface of spool and left and right side valve seal surface wear little, seal three tight expansion sluice valves.

For solving the problems of the technologies described above the present invention by the following technical solutions: three expansion sluice valves, comprise valve body, spool and valve rod, described valve body has left and right side valve body sealing surface, valve rod band movable valve plug longitudinally-moving, described spool comprises middle flashboard, left flashboard and right flashboard, described middle flashboard is between left flashboard and right flashboard, middle flashboard, left flashboard and right flashboard can overall longitudinally-movings, middle flashboard can relatively left flashboard and right flashboard longitudinally-moving, middle flashboard is provided with the inclined-plane that left flashboard and right flashboard are laterally strutted to both sides, left and right flashboard is respectively equipped with the left and right side flashboard sealing surface being sealed and matched with left and right side valve body sealing surface butt.

The beneficial effect of three expansion sluice valves provided by the invention is: because described spool comprises middle flashboard, left flashboard and right flashboard, described middle flashboard is between left flashboard and right flashboard, that is to say compared with existing gate valve, main difference part is, spool of the present invention is made up of three shoe brake plates, be respectively middle flashboard, left flashboard and right flashboard, middle flashboard, left flashboard and right flashboard can overall longitudinally-movings, that is to say middle flashboard, left flashboard and right flashboard can move toward flow direction, or toward moving away from flow direction, middle flashboard can relatively left flashboard and right flashboard longitudinally-moving, that is to say between flashboard and left flashboard and right flashboard and can relatively vertically move, middle flashboard is provided with the inclined-plane that left flashboard and right flashboard are laterally strutted to both sides, that is to say that middle flashboard is wedge shape, by sphenoid surface, left flashboard and right flashboard are laterally strutted to both sides, left and right flashboard is respectively equipped with the left and right side flashboard sealing surface being sealed and matched with left and right side valve body sealing surface butt, that is to say that sealing surface is separately positioned on left and right flashboard, sealing surface and left and right side valve body sealing surface butt by left and right flashboard are sealed and matched, thereby gate valve is closed, such structure makes flashboard in valve rod drive, in the process that the entirety of left flashboard and right flashboard moves toward flow direction, the sealing surface of left and right flashboard and left and right side valve body sealing surface are all the time in phase-separated state, greatly reduce the longitudinal friction between spool and valve body sealing surface, solve in the time of closing gate valve, the problem that the sealing surface of left and right flashboard and left and right side valve body sealing surface wear extent are large, it is as follows that gate valve is closed step, flashboard during valve rod drives, the overall longitudinally-moving of left flashboard and right flashboard, flashboard in driving, the entirety of left flashboard and right flashboard moves toward flow direction, after left flashboard and right flashboard move into place, left flashboard and right flashboard stop vertically moving, and middle flashboard continues to indulge toward flow direction and moves, in, flashboard moves toward flow direction relative to left flashboard and right flashboard, middle flashboard laterally struts left flashboard and right flashboard to both sides by inclined-plane, the right side valve body sealing surface of turning left moves, sealing surface and the left and right side valve body sealing surface butt of left and right flashboard are sealed and matched, thereby gate valve is closed, fluid is cut off, therefore in the closing process of gate valve, reduce the friction of sealing surface and the left and right side valve body sealing surface of left and right flashboard, make the wear extent between sealing surface and the left and right side valve body sealing surface of left and right flashboard less, friction position has been transferred between middle flashboard and left flashboard and right flashboard, thereby can not exert an influence to the sealing of valve body, gate valve unlatching step is as follows, flashboard longitudinally-moving during valve rod first drives, now left and right flashboard stops in a longitudinal direction, in only driving, flashboard is away from flow direction, namely middle flashboard relative to left and right flashboard toward moving away from flow direction, now left and right flashboard only does horizontal activity, when left and right flashboard sealing surface leaves after left and right side valve body sealing surface, middle flashboard, the entirety of left flashboard and right flashboard is toward moving away from flow direction, thereby unlatching gate valve, therefore in the process of opening, reduce equally the friction of sealing surface and the left and right side valve body sealing surface of left and right flashboard, make the sealing surface of left and right flashboard and the wear extent of left and right side valve body sealing surface less, friction position has been transferred between middle flashboard and left flashboard and right flashboard, thereby can not exert an influence to the sealing of valve body, finally make gate valve durable in use, the gate valve that user need not more renew, user cost reduces greatly.

Below in conjunction with drawings and Examples, three expansion sluice valves provided by the invention are further described in detail.

Brief description of the drawings

Fig. 1 is one of structural representation of three expansion sluice valve embodiments provided by the invention.

Fig. 2 be three expansion sluice valve embodiments provided by the invention structural representation two.

Fig. 3 is one of structure for amplifying schematic diagram of spool in Fig. 1.

Fig. 4 be spool in Fig. 1 structure for amplifying schematic diagram two.

Fig. 5 be spool in Fig. 1 structure for amplifying schematic diagram three.

Fig. 6 be spool in Fig. 1 structure for amplifying schematic diagram four.

Fig. 7 be spool in Fig. 1 structure for amplifying schematic diagram five.

Fig. 8 be spool in Fig. 1 structure for amplifying schematic diagram six.

Fig. 9 be spool in Fig. 1 structure for amplifying schematic diagram seven.

Figure 10 is the structure for amplifying schematic diagram of spool in Fig. 2.

Embodiment

As Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, shown in Figure 10, the embodiment of three expansion sluice valves provided by the invention, comprises valve body 1, spool 2 and valve rod 3, described valve body 1 has left and right side valve

body sealing surface

11, 12, valve rod 3 is with movable valve plug 2 longitudinally-movings, and described spool 2 comprises middle flashboard 21, left flashboard 22 and right flashboard 23, described middle flashboard 21 between left flashboard 22 and right flashboard 23, middle flashboard 21, left flashboard 22 and right flashboard 23 can overall longitudinally-movings, and middle flashboard 21 can relatively left flashboard 22 and right flashboard 23 longitudinally-movings, and middle flashboard 21 is provided with the inclined-plane 21a that left flashboard 22 and right flashboard 23 are laterally strutted to both sides, left and

right flashboard

22, 23 are respectively equipped with and left and right side valve body sealing surface 11, the left and right side flashboard sealing surface 22a that 12 butts are sealed and matched, 23a, wherein gate valve also comprises valve gap h, nut i, runner j, described valve gap h is fixedly mounted on valve body 1, described nut i is fixedly mounted on valve gap h, valve rod 3 is through nut i, and valve rod 3 matches by screw thread with nut i, and described runner j is arranged on valve rod 3, runner j rotates band ovable valve stem 3 longitudinally-movings, valve rod 3 is with movable valve plug 2 longitudinally-movings, perpendicular to the rectilinear movement of flow direction, that is to say by valve rod 3, the cooperation of nut i and runner j will rotatablely move and be converted to straight line motion.

As Fig. 1, Fig. 2, Fig. 9, shown in Figure 10, described spool 2 be provided with make that left flashboard 22 and right flashboard 23 draw close effect all the time mutually draw close parts 24, that is to say that left flashboard 22 is pressed in middle flashboard 21 with right flashboard 23 by drawing close parts 24, make left flashboard 22, middle flashboard 21 and right flashboard 23 threes link together firmly, guarantee that three can not be separated, in the time opening gate valve, middle flashboard 21 is toward moving away from flow direction, drawing close parts 24 makes left flashboard 22 be pressed in middle flashboard 21 with right flashboard 23 transverse shiftings, make the sealing surface 22a of left flashboard 22 and

right flashboard

23, 23a and left and right side valve

body sealing surface

11, 12 are separated, be reduced in the sealing surface 22a of left flashboard 22 and right flashboard 23 in opening process, 23a and left and right side valve

body sealing surface

11, 12 friction, wear extent is reduced.

As Fig. 1, Fig. 2, Fig. 9, shown in Figure 10, the described parts 24 of drawing close are for extension spring 24a, the both sides of left flashboard 22 and right flashboard 23 are equipped with extension spring 24a, wherein extension spring 24a is also draught spring, being called for short extension spring is the helical spring that bears axial tension, extension spring 24a generally uses the manufacture of circular section material, while not bearing load, between the circle of extension spring 24a and circle, be all generally and tight very close to each other, one end of left flashboard 22 and the extension spring 24a of right flashboard 23 1 sides is connected with left flashboard 22, the other end of left flashboard 22 and the extension spring 24a of right flashboard 23 1 sides is connected with right flashboard 23, one end of left flashboard 22 and the extension spring 24a of right flashboard 23 opposite sides is connected with left flashboard 22, the other end of left flashboard 22 and the extension spring 24a of right flashboard 23 opposite sides is connected with right flashboard 23, that is to say that extension spring 24a is arranged on left flashboard 22 and right flashboard 23 sidepieces, and the both sides of left flashboard 22 and right flashboard 23 are equipped with extension spring 24a, make left flashboard 22 and right flashboard 23 can better be pressed in middle flashboard 21, the impacting force of left flashboard 22 and right flashboard 23 is more balanced, in the time of closing gate valve, middle flashboard 21 moves relative to left flashboard 22 and right flashboard 23, inclined-plane 21a by middle flashboard 21 laterally struts left flashboard 22 and right flashboard 23 to both sides, make the sealing surface 22a of left flashboard 22 and

right flashboard

23, 23a and left and right side valve

body sealing surface

11, 12 butt sealings, because the inclined-plane of flashboard 21 in left flashboard 22 and right flashboard 23 quilts laterally struts, therefore extension spring 24a is stretched, the pulling force of extension spring 24a will act on left flashboard 22 and right flashboard 23, thereby in the process of opening gate valve, central flashboard 21 moves away from flow direction with right flashboard 23 is past relative to left flashboard 22, the pulling force of extension spring 24a makes left flashboard 22 be pressed in middle flashboard 21 with right flashboard 23 transverse shiftings.

As Fig. 2, shown in Figure 10, wherein the mounting type of extension spring 24a can also be done following accommodation, the described parts 24 of drawing close are for extension spring 24a, the both sides of left flashboard 22 and right flashboard 23 are equipped with extension spring 24a, the both sides of left flashboard 22 and right flashboard 23 are equipped with positioning part 25, 26He Xia positioning part, middle positioning part 27, upper positioning part 25, lower positioning part 27 is arranged on left flashboard 22, middle positioning part 26 is arranged on right flashboard 23, or upper positioning part 25, lower positioning part 27 is arranged on right flashboard 23, middle positioning part 26 is arranged on left flashboard 22, described extension spring 24a comprises upper end 24a1, middle-end 24a2 and lower end 24a3, the upper end 24a1 of spring 24a is arranged on positioning part 25, the middle-end 24a2 of spring 24a is arranged on middle positioning part 26, the lower end 24a3 of spring 24a is arranged on lower positioning part 27, by three locating points, fixing extension spring 24a makes the tightening force of extension spring 24a larger, be applicable to larger gate valve.

As Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, shown in Fig. 7, described spool 2 comprise two ends respectively with left and

right flashboard

22, 23 attachment posts that are associated 4, the one end that is to say attachment post 4 is flexibly connected with left flashboard 22, the other end of attachment post 4 is flexibly connected with right flashboard 23, the abutting part 5 that is arranged on middle flashboard 21 and can coordinates with attachment post 4 butts, that is to say that flashboard 21 is provided with abutting part 5, abutting part 5 can coordinate with attachment post 4 butts, middle flashboard 21 drives attachment post 4 longitudinally-movings by abutting part 5, attachment post 4 drives left and

right flashboard

22, 23 longitudinally-movings, between attachment post 4 and middle flashboard 21, there is the first space 6 of longitudinally-moving relatively, that is to say between attachment post 4 and middle flashboard 21 and can relatively vertically move, left and

right flashboard

22, 23 have respectively with attachment post 4 can be relative horizontal movable second space 7, attachment post 4 and left and right flashboard 22, transverse shifting relatively between 23, drive left and right flashboard 22 by

attachment post

4, 23 longitudinally-movings, can guarantee middle flashboard 21 and left and

right flashboard

22, 23 overall longitudinally-moving is more stable, guarantee gate valve unlatching or close, described middle flashboard 21 is provided with middle flashboard through hole a, described attachment post 4 is through middle flashboard through hole a, the limit wall a1 of described middle flashboard through hole a is the abutting part 5 coordinating with attachment post 4 butts, flashboard is in unlatching or closing process, the top wall a1 or the following wall a1 that are mainly middle flashboard through hole a coordinate with attachment post 4 butts, drive attachment post 4 to move, the phase of left flashboard 22 and right flashboard 23 is equipped with blind hole b to the inside, insert respectively in the blind hole b of left flashboard 22 and right flashboard 23 at the two ends of attachment post 4, described the first space 6 be can relative longitudinally-moving between attachment post 4 and middle flashboard through hole a longitudinally-moving space 61, the two ends that described second space 7 is attachment post 4 respectively with left flashboard 22 and the blind hole b of right flashboard 23 between can be relative horizontal movable horizontal movable space 71, have simple in structure, manufacture cost effect.

As Fig. 1, Fig. 2, shown in Fig. 6, wherein the mounting type of attachment post 4 can also be done following accommodation, described spool 2 comprises the attachment post 4 that is fixedly installed on middle flashboard 21, that is to say that attachment post 4 is fixedly mounted on middle flashboard 21, between attachment post 4 and middle flashboard 21, can not relatively move, be separately positioned on left and

right flashboard

22, 23 abutting parts 5 that also can coordinate with attachment post 4 butts, that is to say that abutting part 5 is separately positioned on left and

right flashboard

22, 23, left and

right flashboard

22, 23 have respectively can relative longitudinally-moving with attachment post 4 the first space 6, that is to say attachment post 4 and left and

right flashboard

22, 23 can vertically move relatively, left and

right flashboard

22, 23 have respectively with attachment post 4 can be relative horizontal movable second space 7, that is to say attachment post 4 and left and

right flashboard

22, 23 transverse shiftings relatively, this structure also can make middle flashboard 21 and left and

right flashboard

22, 23 overall longitudinally-moving is more stable, guarantee gate valve unlatching or close, described left flashboard 22 and right flashboard 23 are equipped with chute c, the limit wall c1 of described chute c is the abutting part 5 coordinating with attachment post 4 butts, described attachment post 4 is arranged on the both sides of middle flashboard 21, the attachment post 4 of described middle flashboard 21 both sides inserts respectively among the chute c of left flashboard 22 and right flashboard 23, described the first space 6 be can relative longitudinally-moving between attachment post 4 and chute c longitudinally-moving space 61, described second space 7 be can be relative between attachment post 4 and chute c horizontal movable horizontal movable space 71, that is to say in the time that gate valve is opened or closed, middle flashboard 21 drives attachment post 4 to vertically move, the limit wall c1 butt of attachment post 4 and chute c, attachment post 4 drives left flashboard 22 and right flashboard 23 to vertically move by the limit wall c1 of chute c, this structure has simple in structure equally, manufacture cost effect.

As Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 8, shown in Figure 10, the middle flashboard 21 of described spool 2 is provided with resetting means, described spool 2 comprises reset frame d, lower reset frame e and Returnning spring f, middle flashboard 21 is provided with reset through hole g, described upper reset frame d, lower reset frame e and Returnning spring f are all positioned among reset through hole g, upper reset frame d is fixedly connected with the top of reset through hole g, the two ends of lower reset frame e are erected at respectively on left flashboard 22 and right flashboard 23, one end of Returnning spring f and upper reset frame d butt, the other end of Returnning spring f and lower reset frame e butt, that is to say that Returnning spring f is arranged between reset frame d and lower reset frame e, wherein Returnning spring f is stage clip, in the time of closing gate valve, upper reset frame d follows middle flashboard 21 and moves stage clip pressing, make stage clip contraction deformation, store energy of deformation, therefore in the time opening gate valve, the energy of deformation that stage clip stores can be delivered to middle flashboard 21, gate valve is opened more laborsaving, after Returnning spring f also makes gate valve open, between middle flashboard 21 and left flashboard 22 and right flashboard 23, reset to initial position, thereby in the time of each closing gate valve, middle flashboard 21 can move relative to left flashboard 22 and right flashboard 23.

As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 7, Fig. 9, Figure 10, middle flashboard 21 resetting means of described spool 2 can also be done following accommodation, described spool 2 comprises Returnning spring f and fixing column k, middle flashboard 21 is provided with reset through hole g, Returnning spring f is positioned among reset through hole g, the two ends of Returnning spring f are separately positioned between left flashboard 22 and right flashboard 23 by fixing column k, it is more laborsaving that such structure makes gate valve open equally, gate valve makes to reset to initial position between middle flashboard 21 and left flashboard 22 and right flashboard 23 after opening.

As shown in Fig. 4, Fig. 5, Fig. 6, Fig. 7, described middle flashboard through hole a and attachment post 4 all arrange two, can prevent that left flashboard 22 and right flashboard 23 from rotating, the stability of gate valve is improved greatly, certainly single middle flashboard through hole a and single attachment post 4 also can prevent that left flashboard 22 and right flashboard 23 from rotating, middle flashboard through hole a, attachment post 4 and blind hole b are all arranged to square, are also set to square chute c if abutting part 5 is chute c.

As Fig. 1, shown in Fig. 2, the inclined-plane 21a of described middle flashboard comprises middle flashboard left side inclined-plane 21a1 and middle flashboard right side inclined-plane 21a2, left flashboard 22 comprises flashboard inclined-plane, the left side 22b matching with middle flashboard left side inclined-plane 21a1, right flashboard 23 comprises flashboard inclined-plane, the right side 23b matching with middle flashboard right side inclined-plane 21a2, left valve barrel sealing surface 11, left flashboard sealing surface 22a, left side flashboard inclined-plane 22b and middle flashboard left side inclined-plane 21a1 all parallel, right valve barrel sealing surface 12, right flashboard sealing surface 23a, right side flashboard inclined-plane 23b and middle flashboard right side inclined-plane 21a2 all parallel, left flashboard sealing surface 22a and right flashboard sealing surface 23b are obliquely installed mutually, such structure makes Gate-valve sealing better effects if.

As Fig. 1, shown in Fig. 2, wherein spool 2 and left and right side valve

body sealing surface

11, 12 fit system can also be done following accommodation, the inclined-plane 21a of described middle flashboard comprises middle flashboard left side inclined-plane 21a1 and middle flashboard right side inclined-plane 21a2, left flashboard 22 comprises flashboard inclined-plane, the left side 22b matching with middle flashboard left side inclined-plane 21a1, right flashboard 23 comprises flashboard inclined-plane, the right side 23b matching with middle flashboard right side inclined-plane 21a2, left valve barrel sealing surface 11, left flashboard sealing surface 22a, right valve barrel sealing surface 12 and right flashboard sealing surface 23a all parallel, left side flashboard inclined-plane 22b parallels with middle flashboard left side inclined-plane 21a1, flashboard inclined-plane, right side 23b parallels with middle flashboard right side inclined-plane 21a2, left flashboard sealing surface 22a and middle flashboard left side inclined-plane 21a1 and middle flashboard right side inclined-plane 21a2 are obliquely installed mutually, such structure also can make gate valve have the feature of good sealing effect.

Claims

1. three expansion sluice valves, comprise valve body (1), spool (2) and valve rod (3), described valve body (1) has left and right side valve body sealing surface (11), (12), valve rod (3) band movable valve plug (2) longitudinally-moving, it is characterized in that: described spool (2) comprises middle flashboard (21), left flashboard (22) and right flashboard (23), described middle flashboard (21) is positioned between left flashboard (22) and right flashboard (23), middle flashboard (21), left flashboard (22) and right flashboard (23) can overall longitudinally-movings, middle flashboard (21) can relatively left flashboard (22) and right flashboard (23) longitudinally-moving, middle flashboard (21) is provided with the inclined-plane (21a) that left flashboard (22) and right flashboard (23) are laterally strutted to both sides, left and right flashboard (22), (23) be respectively equipped with and left and right side valve body sealing surface (11), (12) the left and right side flashboard sealing surface (22a) that butt is sealed and matched, (23a).

2. three expansion sluice valves according to claim 1, is characterized in that: described spool (2) be provided with make that left flashboard (22) and right flashboard (23) draw close effect all the time mutually draw close parts (24).

3. three expansion sluice valves according to claim 2, it is characterized in that: described in to draw close parts (24) be extension spring (24a), the both sides of left flashboard (22) and right flashboard (23) are equipped with extension spring (24a), one end of the extension spring (24a) of left flashboard (22) and right flashboard (23) one sides is connected with left flashboard (22), the other end of the extension spring (24a) of left flashboard (22) and right flashboard (23) one sides is connected with right flashboard (23), one end of left flashboard (22) and the extension spring (24a) of right flashboard (23) opposite side is connected with left flashboard (22), the other end of left flashboard (22) and the extension spring (24a) of right flashboard (23) opposite side is connected with right flashboard (23).

4. three expansion sluice valves according to claim 2, it is characterized in that: described in to draw close parts (24) be extension spring (24a), the both sides of left flashboard (22) and right flashboard (23) are equipped with extension spring (24a), the both sides of left flashboard (22) and right flashboard (23) are equipped with positioning part (25), middle positioning part (26) and lower positioning part (27), upper positioning part (25), lower positioning part (27) is arranged on left flashboard (22), middle positioning part (26) is arranged on right flashboard (23), or upper positioning part (25), lower positioning part (27) is arranged on right flashboard (23), middle positioning part (26) is arranged on left flashboard (22), described extension spring (24a) comprises upper end (24a1), middle-end (24a2) and lower end (24a3), the upper end (24a1) of spring (24a) is arranged on positioning part (25), the middle-end (24a2) of spring (24a) is arranged on middle positioning part (26), the lower end (24a3) of spring (24a) is arranged on lower positioning part (27).

5. according to three expansion sluice valves described in claim 1 or 2 or 3 or 4, it is characterized in that: described spool (2) comprises the attachment post (4) that two ends are associated with left and right flashboard (22), (23) respectively, the abutting part (5) that is arranged on middle flashboard (21) and can coordinates with attachment post (4) butt, between attachment post (4) and middle flashboard (21), have can relative longitudinally-moving the first space (6), left and right flashboard (22), (23) have respectively with attachment post (4) can be relative horizontal movable second space (7).

6. according to three expansion sluice valves described in claim 1 or 2 or 3 or 4, it is characterized in that: described spool (2) comprises the attachment post (4) that is fixedly installed on middle flashboard (21), the abutting part (5) that is separately positioned on left and right flashboard (22), (23) and can coordinates with attachment post (4) butt, left and right flashboard (22), (23) have respectively the first space (6) that can relative longitudinally-moving with attachment post (4), left and right flashboard (22), (23) have respectively with attachment post (4) can be relative horizontal movable second space (7).

7. three expansion sluice valves according to claim 5, it is characterized in that: described middle flashboard (21) is provided with middle flashboard through hole (a), described attachment post (4) is through middle flashboard through hole (a), the limit wall (a1) of described middle flashboard through hole (a) is the abutting part (5) coordinating with attachment post (4) butt, the phase of left flashboard (22) and right flashboard (23) is equipped with blind hole (b) to the inside, insert respectively in the blind hole (b) of left flashboard (22) and right flashboard (23) at the two ends of attachment post (4), described the first space (6) be can relative longitudinally-moving between attachment post (4) and middle flashboard through hole (a) longitudinally-moving space (61), described second space (7) be attachment post (4) two ends respectively with left flashboard (22) and the blind hole (b) of right flashboard (23) between can be relative horizontal movable horizontal movable space (71).

8. three expansion sluice valves according to claim 6, it is characterized in that: described left flashboard (22) and right flashboard (23) are equipped with chute (c), the limit wall (c1) of described chute (c) is the abutting part (5) coordinating with attachment post (4) butt, described attachment post (4) is arranged on the both sides of middle flashboard (21), the attachment post (4) of described middle flashboard (21) both sides inserts respectively among the chute (c) of left flashboard (22) and right flashboard (23), described the first space (6) be can relative longitudinally-moving between attachment post (4) and chute (c) longitudinally-moving space (61), described second space (7) is can the relative laterally horizontal movable space (71) of activity between attachment post (4) and chute (c).

9. three expansion sluice valves according to claim 7, it is characterized in that: described spool (2) comprises reset frame (d), lower reset frame (e) and Returnning spring (f), middle flashboard (21) is provided with reset through hole (g), described upper reset frame (d), lower reset frame (e) and Returnning spring (f) are all positioned among reset through hole (g), upper reset frame (d) is fixedly connected with the top of reset through hole (g), the two ends of lower reset frame (e) are erected at respectively on left flashboard (22) and right flashboard (23), one end of Returnning spring (f) and upper reset frame (d) butt, the other end of Returnning spring (f) and lower reset frame (e) butt.

10. three expansion sluice valves according to claim 9, is characterized in that: described middle flashboard through hole (a) is equipped with two with attachment post (4).