CN104344018B - A kind of end surface sealed rotary valve - Google Patents
A kind of end surface sealed rotary valve Download PDFInfo
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- CN104344018B CN104344018B CN201410589311.6A CN201410589311A CN104344018B CN 104344018 B CN104344018 B CN 104344018B CN 201410589311 A CN201410589311 A CN 201410589311A CN 104344018 B CN104344018 B CN 104344018B
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- spool
- valve
- valve body
- hydraulic fluid
- commutation
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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
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
- F16K11/072—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with pivoted closure members
Abstract
A kind of end surface sealed rotary valve, belongs to reversal valve, and solving existing rotary valve cannot compensate, in problems such as mesohigh lower-pilot power are bigger the fretting wear in motion and variations in temperature.The present invention includes valve body, bottom, spool, thrust ball bearing, compression plug screw, reducing motor, bottom is connected with valve body screw thread, spool and valve body matched in clearance, compress plug screw to coordinate with valve body screw thread, equipped with thrust ball bearing between spool and compression plug screw, reducing motor one end embeds valve body and is connected by screw fixing, and the motor shaft of reducing motor coordinates with spool.Present configuration is compact, it is possible to ensureing the reliable commutation of hydraulic system, to ambient temperature and the strong adaptability of operating pressure, the fretting wear being brought kinematic pair long-term work has good self-compensating property, and sealing property is reliable, and the convenient maintenance of independent valve seat is changed；Overall cylindrical shape is easily installed among various industrial piping systems, and the fluid that can be used under the High Temperature High Pressure such as power plant, oil-gas mining field controls.
Description
Technical field
The invention belongs to reversal valve, be specifically related to a kind of end surface sealed rotary valve, the fluid that can be used under the High Temperature High Pressure such as power plant, oil-gas mining field controls.
Background technology
The most conventional reversal valve has ball valve, guiding valve etc..Ball valve relies on the realization that closely cooperates of valve ball and valve seat to seal reliably, standard-sized sheet or fully closed time, the sealing surface of spheroid and valve seat is isolated with medium, when medium passes through, the erosion of valve sealing face will not be caused, safe and reliable, it is widely used in the middle of oil, chemical industry, generating, aviation and people's daily life, but ball valve positive sealing to be realized generally requires and valve ball and valve seat are carried out underhand polish, until spool fits like a glove with valve seat, processing technique difficulty is bigger.Guiding valve is owing to having simple in construction, commutation switching is rapidly, out-of-balance force suffered by spool is less, commutation is required to be handled the advantage such as less and is widely used in hydraulic transmission control system, but the seal form of guiding valve is matched in clearance to be sealed, certain leakage can be there is, it is difficult to realize sealing reliably.
Rotary valve refers to be controlled the break-make of runner and the reversal valve of commutation by rotary spool, and compared with traditional ball valve and guiding valve, it has good processing technology and safe and reliable sealing simultaneously.The spool of rotary valve is fixed with the structure of valve seat at present, link up oil groove by design on spool and link up oil circuit, a kind of braking reversing rotary valve patent application that Zhejiang University is proposed, application number 201310709839.8, announce in 2013.12.21, just use the structure of this fixed cooperation.There is the following weak point in the rotary valve of this structure:
(1) when, using under mesohigh operating mode, owing to spool to bear bigger hydraulic coupling, the frictional force between spool and valve body can be made to become big, particularly when using the working media of the such as low viscosity such as water, ethanol, poor lubricity, need bigger operating physical force, significantly exacerbate driving torque；
(2), spool can cause gap to become big due to long-term relative skimming wear, leakage, even finally seal failure occur with the sealing surface of valve seat；
(3), when operating ambient temperature changes, it is impossible to the deformation to spool and seat material reasonably compensates, operating physical force so can be caused to become big, even stuck phenomenon.
Summary of the invention
The present invention provides a kind of end surface sealed rotary valve, and solving existing rotary valve cannot compensate the fretting wear caused in motor process and variations in temperature, in problems such as mesohigh lower-pilot power are bigger.
A kind of end surface sealed rotary valve provided by the present invention, including valve body, bottom, spool, thrust ball bearing, compression plug screw, reducing motor, it is characterised in that:
Described valve body is cylindrical shape, and its inner chamber is stepped hole, is followed successively by bottom thread segment, seal section, middle part thread segment and top section from left to right；
Described bottom is second order Step Shaft, and by big end with small end is integral constitutes, big end surfaces has external screw thread, with described bottom thread segment threaded engagement, small end external diameter adapts with described seal section；The oil return opening that on big end end face, there is symmetry, is evenly arranged, the first commutation hydraulic fluid port, the second commutation hydraulic fluid port, oil-in, wherein oil return opening and oil-in are symmetrical about big end end face center, and the first commutation hydraulic fluid port and the second commutation hydraulic fluid port are symmetrical about big end end face center；Having arc-shaped limit chute on small end end face, its radian is π/4, and the top of arc-shaped limit chute and end commutate hydraulic fluid port, oil-in in same radial alignment with first respectively；Described oil return opening, the first commutation hydraulic fluid port, the second commutation hydraulic fluid port are identical with the physical dimension of oil-in, are the second order stepped hole axially through bottom, aperture connect with macropore and constitute, and aperture aperture is positioned at bottom big end end face；The most all being sequentially arranged with disc spring and valve seat in the macropore of described oil return opening, the first commutation hydraulic fluid port, the second commutation hydraulic fluid port and oil-in, described valve seat is the cylinder with axial central through hole；
Described spool is second order Step Shaft, is constituted by butt end and taper end are integral, and butt end external diameter adapts with described seal section；The oil return aperture that have symmetry on butt end end face, is evenly arranged, the first commutation oilhole mouth, the second commutation oilhole mouth, oil-feed aperture, their position is corresponding with the axial central through hole of valve seat in the oil return opening of described bottom, the first commutation hydraulic fluid port, the second commutation hydraulic fluid port and oil-in respectively；Wherein, first commutation oilhole mouth is connected by the first V-arrangement oilhole in spool with oil-feed aperture, second commutation oilhole mouth connects by the second V-arrangement oilhole in spool with oil return aperture, and described first V-arrangement oilhole and the second V-arrangement oilhole lay respectively in spool two about in the axially in parallel plane that spool axis is symmetry；Being further fixed on spacer pin on butt end end face, its position is corresponding with the top of described arc-shaped limit chute；Taper end end face center has axial pilot hole, coordinates for the motor shaft with described reducing motor；
Described compression plug screw is the cylinder with axial center hole, and its surface has external screw thread, with the middle part thread segment threaded engagement with described valve body；
Described bottom is connected with valve body screw thread, is installed on bottom thread segment and the seal section of valve body；Described spool and valve body matched in clearance, be installed on the seal section of valve body so that spacer pin is positioned at the arc-shaped limit chute of described bottom；Described compression plug screw coordinates with described valve body screw thread, is installed on the middle part thread segment of valve body, and the taper end of spool, through the axial center hole of compression plug screw, equipped with thrust ball bearing between spool and compression plug screw, can regulate the pretightning force of valve easily by compressing plug screw；
Described reducing motor one end embeds the top section of described valve body and is connected by screw fixing, and the motor shaft of reducing motor coordinates with the taper end pilot hole of described spool.
Described end surface sealed rotary valve, it is further characterized by
The little end surfaces of described bottom has bottom annular groove for installing bottom sealing ring, and small end cooperatively forms static seal by bottom sealing ring and described seal section；
Described valve seat uses the engineering plastics of high intensity to make, taper surface it is processed in order to install disc spring bottom it, valve base surface has valve cup ring connected in star for installing valve seat insert, and valve seat cooperatively forms static seal by the macropore of valve seat insert Yu corresponding second order stepped hole；
Described spool uses corrosion resistant alloy processing, and the butt end surface of spool has spool annular groove for installing valve core seal ring, and butt end cooperatively forms sealing by valve core seal ring and described seal section.
When the motor shaft of described reducing motor coordinates with the taper end pilot hole of described spool, axial gap is left between bottom motor shaft ends and pilot hole, axial force suffered by spool is all acted on thrust ball bearing, thrust ball bearing bears whole load, reducing motor is not by responsive to axial force, to ensure spool flexibility and reliability motion under high pressure, and reduce frictional resistance reduction driving torque.
The oil return opening of the present invention, first commutation hydraulic fluid port, second commutation hydraulic fluid port, 4 hydraulic fluid ports of oil-in are arranged on the same end face of bottom, on these 4 hydraulic fluid ports independently be mounted with floating valve seat, high intensity that floating valve seat uses also has the engineering plastics of fine self-lubricity, the end face of floating valve seat forms flat seal with the butt end end face precision-fit of spool, it is fitted with butterfly spring after each floating valve seat, it primarily serves the purpose of: one is because thermal expansion produced by the change of working environment or working media temperature carries out thermal compensation to floating valve seat and spool, prevent flatulence of heat type stuck and cannot rotate flexibly；Two is that floating valve seat is loaded certain initial pretightning force, improves sealing reliability；Three is the abrasion caused owing to doing frictional rotation for a long time for compensating spool and floating valve seat, and causes the decline of seal pressure, and ultimately results in seal failure leakage；Spool uses corrosion resistant alloy, makes sealing valve port position realize soft seal and coordinates, and seal pressure is little.Two first, second V-arrangement oilholes being arranged symmetrically with it are machined with on spool, the valve seat of layout corresponding on bottom matches, first commutation hydraulic fluid port and oil-in, the second commutation hydraulic fluid port and oil return opening are linked up two-by-two, control to spool corner is that the spacer pin by being arranged on spool realizes with the arc-shaped limit chute on bottom, the spacing angle of the arc-shaped limit chute on bottom is 90 °, reducing motor drives spool positive and negative rotation 90 °, can realize the commutation function of valve.It is mounted with thrust ball bearing between spool and compression plug screw, can effectively reduce friction torque, reduce starting torque so that valve also can rotate under high-pressure situations flexibly.
The present invention uses the floating type valve seat of 4 groups of independences, compact conformation, it is possible to ensure the reliable commutation of hydraulic system, to ambient temperature and the strong adaptability of operating pressure, the fretting wear being brought kinematic pair long-term work has good self-compensating property, and sealing property is reliable；The convenient maintenance of independent valve seat is changed, and has good processing technology；Overall cylindrical shape can be advantageously mounted among various industrial piping system, it is adaptable to the fluid in the High Temperature High Pressure harsh and unforgiving environments such as such as power plant, oil, natural gas extraction controls.
Accompanying drawing explanation
Fig. 1 (A) is present configuration schematic diagram；
Fig. 1 (B) is the A-A sectional view of Fig. 1 (A)；
Fig. 2 is valve body structure schematic diagram；
Fig. 3 (A) is bottom cover structure schematic diagram；
Fig. 3 (B) is the top view of Fig. 3 (A)；
Fig. 4 is valve seat construction schematic diagram；
Fig. 5 (A) is valve core structure schematic diagram；
Fig. 5 (B) is the top view of Fig. 5 (A).
Detailed description of the invention
Below in conjunction with the accompanying drawings and be embodied as that the present invention is described in more detail.
Shown in as shown in Fig. 1 (A), Fig. 1 (B), the present invention includes valve body 10, bottom 20, spool 50, compresses plug screw 70, thrust ball bearing 80, reducing motor 90；
As in figure 2 it is shown, described valve body 10 is cylindrical shape, its inner chamber is stepped hole, is followed successively by bottom thread segment 11, seal section 12, middle part thread segment 13, top section 14 from left to right, top section has installing hole 15；
As shown in Fig. 3 (A), Fig. 3 (B), described bottom 20 is second order Step Shaft, and by holding greatly 21 and small end 22 is integral constitutes, big end 21 surfaces have external screw thread, with with described bottom thread segment 11 threaded engagement, small end 22 external diameter adapts with described seal section 12；The oil return opening 21T that on big end 21 end faces, there is symmetry, is evenly arranged, the first commutation hydraulic fluid port 21A, the second commutation hydraulic fluid port 21B, oil-in 21P, wherein oil return opening 21T and oil-in 21P is symmetrical about big end end face center, and the first commutation hydraulic fluid port 21A and the second commutation hydraulic fluid port 21B is symmetrical about big end end face center；Having arc-shaped limit chute 22D on small end 22 end face, its radian is π/4, and the top of arc-shaped limit chute 22D and end commutate hydraulic fluid port 21A, oil-in 21P in same radial alignment with first respectively；Described oil return opening 21T, the first commutation hydraulic fluid port 21A, the second commutation hydraulic fluid port 21B are identical with the physical dimension of oil-in 21P, are the second order stepped hole axially through bottom, aperture connect with macropore and constitute, and aperture aperture is positioned at bottom big end end face；Small end 22 surface of described bottom 20 has bottom annular groove 23 for installing bottom sealing ring 110, and small end 22 cooperatively forms static seal by bottom sealing ring 110 and described seal section 12；
As shown in Fig. 1 (A), described oil return opening 21T, first commutation hydraulic fluid port 21A, second commutation hydraulic fluid port 21B and oil-in 21P macropore in be the most all sequentially arranged with disc spring 30 and valve seat 40；As shown in Figure 4, described valve seat 40 is the cylinder with axial central through hole 41, the engineering plastics using high intensity make, taper surface 42 it is processed in order to install disc spring 30 bottom it, valve seat 40 surface has valve cup ring connected in star 43 for installing valve seat insert 120, and valve seat 40 cooperatively forms static seal by the macropore of valve seat insert 120 with corresponding second order stepped hole；
As shown in Fig. 5 (A), Fig. 5 (B), described spool 50 is second order Step Shaft, by butt end 51 with taper end 52 is integral constitutes, uses corrosion resistant alloy processing, and butt end 51 external diameter adapts with described seal section 12；The oil return aperture 51T that have symmetry on butt end end face, is evenly arranged, the first commutation oilhole mouth 51A, the second commutation oilhole mouth 51B, oil-feed aperture 51P, their position is corresponding with the axial central through hole 41 of valve seat 40 in the oil return opening 21T of described bottom 20, the first commutation hydraulic fluid port 21A, the second commutation hydraulic fluid port 21B and oil-in 21P respectively；Wherein, first commutation oilhole mouth 51A and oil-feed aperture 51P is connected by the first V-arrangement oilhole 53 in spool 50, second commutation oilhole mouth 51B and oil return aperture 51T is connected by the second V-arrangement oilhole 54 in spool 50, and it is in symmetrical axially in parallel plane about spool axis that described first V-arrangement oilhole 53 and the second V-arrangement oilhole 54 lay respectively at interior two of spool 50；Being machined with blind hole 51C on butt end end face in order to install spacer pin 60, its position is corresponding with the top of described arc-shaped limit chute 22D；Taper end 52 end face center has axial pilot hole 52A, coordinates for the motor shaft with described reducing motor 13；Described butt end 51 surface has spool annular groove 55 for installing valve core seal ring 100, and butt end 51 cooperatively forms sealing by valve core seal ring 100 and described seal section 12.
As shown in Fig. 1 (A), described compression plug screw 70 is the cylinder with axial center hole 71, and its surface has external screw thread, with middle part thread segment 13 threaded engagement with described valve body 1；
As shown in Fig. 1 (A), described bottom 20 is threadeded with valve body 10, is installed on bottom thread segment 11 and the seal section 12 of valve body 10；Described spool 50 and valve body 10 matched in clearance, be installed on the seal section 12 of valve body 10 so that spacer pin 60 is positioned at the arc-shaped limit chute 22D of described bottom 20；Described compression plug screw 70 and described valve body 10 threaded engagement, it is installed on the middle part thread segment 13 of valve body 10, the taper end 52 of spool 50 is through the axial center hole 71 compressing plug screw 70, equipped with thrust ball bearing 80 between spool 50 and compression plug screw 70, the pretightning force of valve can be regulated easily by compressing plug screw 70；
Described reducing motor 90 one end embeds the top section 14 of described valve body 10 and is connected by screw fixing, and the motor shaft of reducing motor 90 coordinates with the taper end 52 pilot hole 52A of described spool 50.
When the motor shaft of described reducing motor 90 coordinates with the taper end 52 pilot hole 52A of described spool 50, axial gap is left between bottom motor shaft ends and pilot hole 52A, the axial force suffered by spool 50 is made all to act on thrust ball bearing 80, thrust ball bearing 10 bears whole load, reducing motor 90 is not by responsive to axial force, to ensure spool 50 flexibility and reliability motion under high pressure, and reduce frictional resistance reduction driving torque.
Under original state, second V-arrangement oilhole 54 links up the first commutation hydraulic fluid port 21A and oil-in 21P, first V-arrangement oilhole 53 links up oil return opening 21T and second commutation hydraulic fluid port 21B, when reducing motor 90 drives spool 50 half-twist, communication loop becomes: the second V-arrangement oilhole 54 links up the first commutation hydraulic fluid port 21B and oil-in 21P, first V-arrangement oilhole 53 links up oil return opening 21T and second commutation hydraulic fluid port 21A, complete the commutation function of valve: oil-in 21P → the first commutation hydraulic fluid port 21A, second commutation hydraulic fluid port 21B → oil return openingOil-in 21P → the second commutation hydraulic fluid port 21B, first commutation hydraulic fluid port 21A → oil return opening 21T.
Claims (2)
1. an end surface sealed rotary valve, including valve body (10), bottom (20), spool (50), compresses plug screw (70), thrust ball bearing (80), reducing motor (90), it is characterised in that:
Described valve body (10) is cylindrical shape, and its inner chamber is stepped hole, is followed successively by bottom thread segment (11), seal section (12), middle part thread segment (13) and top section (14) from left to right；
Described bottom (20) is second order Step Shaft, by big end (21) with small end (22) is integral constitutes, holds greatly (21) surface to have external screw thread, with described bottom thread segment (11) threaded engagement, small end (22) external diameter adapts with described seal section (12)；The oil return opening (21T) that on big end (21) end face, there is symmetry, is evenly arranged, the first commutation hydraulic fluid port (21A), the second commutation hydraulic fluid port (21B), oil-in (21P), wherein oil return opening (21T) and oil-in (21P) are symmetrical about big end end face center, and the first commutation hydraulic fluid port (21A) and the second commutation hydraulic fluid port (21B) are symmetrical about big end end face center；Having arc-shaped limit chute (22D) on small end (22) end face, its radian is π/4, and the top of arc-shaped limit chute (22D) and end commutate hydraulic fluid port (21A), oil-in (21P) in same radial alignment with first respectively；Described oil return opening (21T), first commutation hydraulic fluid port (21A), second commutation hydraulic fluid port (21B) identical with the physical dimension of oil-in (21P), it is the second order stepped hole axially through bottom, being connected with macropore by aperture and constitute, aperture aperture is positioned at bottom big end end face；The most all being sequentially arranged with disc spring (30) and valve seat (40) in the macropore of described oil return opening (21T), the first commutation hydraulic fluid port (21A), the second commutation hydraulic fluid port (21B) and oil-in (21P), described valve seat (40) is the cylinder with axial central through hole (41)；
Described spool (50) is second order Step Shaft, and by butt end (51) with taper end (52) is integral constitutes, butt end (51) external diameter adapts with described seal section (12)；The oil return aperture (51T) that have symmetry on butt end end face, is evenly arranged, the first commutation oilhole mouth (51A), the second commutation oilhole mouth (51B), oil-feed aperture (51P), their position is corresponding with the axial central through hole (41) of valve seat (40) in the oil return opening of described bottom (20) (21T), the first commutation hydraulic fluid port (21A), the second commutation hydraulic fluid port (21B) and oil-in (21P) respectively；Wherein, first commutation oilhole mouth (51A) is connected by the first V-arrangement oilhole (53) in spool (50) with oil-feed aperture (51P), second commutation oilhole mouth (51B) and oil return aperture (51T) is connected by the second V-arrangement oilhole (54) in spool (50), described first V-arrangement oilhole (53) and the second V-arrangement oilhole (54) lay respectively at spool (50) interior two about in the axially in parallel plane that spool axis is symmetry；Being further fixed on spacer pin (60) on butt end end face, its position is corresponding with the top of described arc-shaped limit chute (22D)；Taper end (52) end face center has axial pilot hole (52A), coordinates for the motor shaft with described reducing motor (90)；
Described compression plug screw (70) is the cylinder with axial center hole (71), and its surface has external screw thread, with middle part thread segment (13) threaded engagement with described valve body (1)；
Described bottom (20) is threadeded with valve body (10), is installed on bottom thread segment (11) and the seal section (12) of valve body (10)；Described spool (50) and valve body (10) matched in clearance, be installed on the seal section (12) of valve body (10) so that spacer pin (60) is positioned at the arc-shaped limit chute (22D) of described bottom (20)；Described compression plug screw (70) and described valve body (10) threaded engagement, it is installed on the middle part thread segment (13) of valve body (10), the taper end (52) of spool (50) is through the axial center hole (71) compressing plug screw (70), equipped with thrust ball bearing (80) between spool (50) and compression plug screw (70), the pretightning force of valve can be regulated easily by compressing plug screw (70)；
Described reducing motor (90) one end embeds the top section (14) of described valve body (10) and is connected by screw fixing, and the motor shaft of reducing motor (90) coordinates with taper end (52) pilot hole (52A) of described spool (50).
2. end surface sealed rotary valve as claimed in claim 1, it is characterised in that:
Small end (22) surface of described bottom (20) has bottom annular groove (23) and is used for installing bottom sealing ring (110), and small end (22) cooperatively forms static seal by bottom sealing ring (110) and described seal section (12)；
Described valve seat (40) uses the engineering plastics of high intensity to make, taper surface (42) it is processed in order to install disc spring (30) bottom it, valve seat (40) surface has valve cup ring connected in star (43) and is used for installing valve seat insert (120), and valve seat (40) cooperatively forms static seal by the macropore of valve seat insert (120) Yu corresponding second order stepped hole；
Described spool (50) uses corrosion resistant alloy processing, butt end (51) surface of spool (50) has spool annular groove (55) and is used for installing valve core seal ring (100), and butt end (51) cooperatively forms sealing by valve core seal ring (100) and described seal section (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410589311.6A CN104344018B (en) | 2014-10-28 | 2014-10-28 | A kind of end surface sealed rotary valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410589311.6A CN104344018B (en) | 2014-10-28 | 2014-10-28 | A kind of end surface sealed rotary valve |
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| CN104344018A CN104344018A (en) | 2015-02-11 |
| CN104344018B true CN104344018B (en) | 2016-09-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108662196A (en) * | 2018-07-20 | 2018-10-16 | 广东格匠实业有限公司 | A kind of steam generating device of back flush |
| CN109458472B (en) * | 2018-10-29 | 2020-05-29 | 新沂市邵店众创工贸发展有限公司 | Multi-path conversion oil valve |
| CN111336147B (en) * | 2020-03-16 | 2021-08-31 | 杭州师范大学钱江学院 | All-stable six-position four-way reversing valve based on rotary valve core and switching method thereof |
| CN112065794B (en) * | 2020-08-19 | 2021-06-11 | 华中科技大学 | Automatic clearance compensation type underwater rotary servo valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2136918Y (en) * | 1992-09-07 | 1993-06-23 | 建设部长沙建筑机械研究所 | Multiway rotary valve |
| DE202009002029U1 (en) * | 2009-04-02 | 2010-09-23 | Melitta Haushaltsprodukte Gmbh & Co. Kg | distributor |
| CN102466059A (en) * | 2010-11-19 | 2012-05-23 | 沈志刚 | Sealed adjustor for double-sealing multiport valve |
| CN102720669B (en) * | 2012-06-29 | 2015-03-04 | 泸州天府液压件有限公司 | Follower rotary valve for plane oil distribution |
| CN103671328B (en) * | 2013-12-21 | 2015-12-09 | 浙江大学 | A kind of automatic reverse rotary valve |
| CN204187047U (en) * | 2014-10-28 | 2015-03-04 | 华中科技大学 | A kind of end surface sealed rotary valve |
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