Positioning type rotary manual operation reversing valve

Abstract

The invention relates to a positioning type rotary manual operation reversing valve which is characterized in that a valve sleeve is installed in a valve sleeve installation through hole in a valve body, four control cavities which are separated in a sealed mode are formed between the valve sleeve and the valve body, the four control cavities are communicated with corresponding radial communication holes in the valve sleeve and corresponding lower through holes in the valve body, and four separated oil supply branches are formed; the oil port T, the oil port A, the oil port B and the oil port P are formed in the lower end of the valve body. The front end cover and the rear end cover are fixedly installed at the front end and the rear end of the valve body respectively, so that the valve element is rotatably installed in a valve element installation through hole of the valve sleeve in the mode that the valve element is limited in the axial direction, a blind hole is formed in the center of the valve element, and a plurality of valve element radial communication holes and a plurality of axial long grooves are formed in the center of the valve element. Three positioning holes are formed in the front end of the valve body, each positioning hole is internally provided with a positioning spring and a positioning ball, and limiting is achieved through a positioning spherical hole formed in the rear side of the front end cover; the rotary handle is fixedly connected to the front end of the valve element, and a spherical positioning groove is formed in the rear side. The fabric is high in anti-pollution capacity.

Description

Technical Field

[0001] This invention relates to the field of manual directional valve technology in hydraulic systems, and more specifically to a positioning rotary manual directional valve used in hydraulic systems to change the flow direction of hydraulic oil. Background Technology

[0002] Manually operated directional control valves are common components in hydraulic systems. Traditional manually operated directional control valves are spool-type valves, where the valve core moves to different positions to connect different oil ports, thus controlling the direction of hydraulic oil flow. However, the spool-type structure is not conducive to maintaining a fixed valve position. Furthermore, when a spool-type directional control valve remains in one position for an extended period, impurities in the hydraulic oil will accumulate at the bottom of the valve sleeve. When the valve core moves relative to the valve sleeve, it carries these deposited impurities between the valve core and the valve sleeve, causing the valve core to jam and the directional control to fail. Therefore, spool-type directional control valves have poor contamination resistance. In conclusion, existing manually operated directional control valves require further improvement. Summary of the Invention

[0003] To address the issues of poor anti-pollution capability and difficulty in positioning of traditional slide valves, this invention provides a positioning rotary manual directional valve with positioning and rotary valve core reversing functions.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A positioning rotary manual directional valve includes a valve body, a valve sleeve, a valve core, a front cover, a rotary handle, and a rear cover. The valve sleeve is installed in the valve sleeve mounting through hole on the valve body in the front-to-back direction, forming four sealed and isolated control chambers between the valve sleeve and the valve body. The four control chambers are connected to the corresponding radial connecting holes on the valve sleeve and the corresponding lower through holes on the valve body, forming four isolated oil supply branches, which are respectively connected to the oil port T, oil port A, oil port B and oil port P at the lower end of the valve body. The front end cover and the rear end cover are fixedly installed on the front end and the rear end of the valve body, respectively, so that the valve core is rotatably installed in the valve core mounting through hole of the valve sleeve in a way that is limited along the axial direction, and the two ends of the valve core and the valve sleeve are in sealed contact; a blind hole is provided in the center of the valve core, and multiple radial connecting holes and multiple axial long grooves are provided that communicate with the blind hole in the center. Three positioning holes are provided at the front end of the valve body, located on the left and right sides and the bottom respectively. A positioning structure is installed in each positioning hole. The positioning structure includes a positioning spring and a positioning ball. The positioning spring is installed in the inner position of the positioning hole, and the positioning ball is installed in the outer position of the positioning hole. The positioning ball is limited by the positioning ball hole provided on the rear side of the front end cover. The rotating handle is fixedly connected to the front end of the valve core, and a spherical positioning groove that cooperates with the positioning ball is provided on the rear side of the rotating handle.

[0005] Furthermore, the valve body has four front mounting screw holes at the front end, which are fixedly connected to the front end cover by screws; the valve body has two rear mounting screw holes at the rear end, which are fixedly connected to the rear end cover by screws; four annular grooves are provided axially along the valve sleeve mounting through hole in the valve body, and four lower through holes are provided between the four annular grooves and the oil port B, oil port P, oil port A and oil port T at the bottom of the valve body.

[0006] Furthermore, four annular grooves are axially spaced on the outer surface of the valve sleeve, and sealing ring mounting grooves are provided on both sides of the four annular grooves; radial connecting holes are provided between the four annular grooves and the valve core mounting through hole. From front to back, the four radial connecting holes are the first radial connecting hole, the second radial connecting hole, the third radial connecting hole, and the fourth radial connecting hole of the valve sleeve, and a fifth radial connecting hole of the valve sleeve is provided on the opposite side of the second radial connecting hole; the valve sleeve is installed in the valve sleeve mounting through hole on the valve body, and the four annular grooves on the valve sleeve are aligned with the four annular grooves on the valve body; a sealing ring is installed in each sealing ring mounting groove on the valve sleeve, so that the valve body and the valve sleeve form a control cavity between two adjacent sealing rings.

[0007] Furthermore, a first radial connecting hole, a second radial connecting hole, and a third radial connecting hole are provided from front to back on the same orientation plane A of the valve core, and a fourth radial connecting hole and a fifth radial connecting hole are provided from front to back on the same orientation plane B of the valve core. The orientation plane B and the orientation plane A are arranged at a 90° angle. The fourth radial connecting hole and the first radial connecting hole are located at the same radial position, and the fifth radial connecting hole and the third radial connecting hole are located at the same radial position. A first axial groove is provided on the outer surface of the valve core between the fourth radial connecting hole and the fifth radial connecting hole. A second axial groove and a third axial groove are provided on the inner and outer surfaces of the valve core on the side opposite to the first axial groove. The first radial connecting hole, the fourth radial connecting hole, and the second axial long groove of the valve core are radially aligned with the first radial connecting hole of the valve sleeve; the first axial long groove and the second axial long groove are radially aligned with the second radial connecting hole and the fifth radial connecting hole of the valve sleeve; the second radial connecting hole, the first axial long groove, and the third axial long groove of the valve core are radially aligned with the third radial connecting hole of the valve sleeve; the third radial connecting hole and the fifth radial connecting hole of the valve core are radially aligned with the fourth radial connecting hole of the valve sleeve.

[0008] Furthermore, a sealing ring mounting groove is provided in the middle of the valve core near both ends, and the sealing ring is installed to achieve a seal with the valve core mounting hole of the valve sleeve at both ends; a rear end cover mounting neck is provided at the rear end of the valve core, and a front end cover positioning mounting platform is provided at the front end of the valve core connected to the middle of the valve core, and two parallel milled positioning surfaces are provided on the front end cover positioning platform; the front end of the valve core is composed of an external thread section and a handle connecting section connected in sequence.

[0009] Furthermore, a portion of the outer ring of the front cover is provided with a recessed arc surface, and a positioning mounting hole is provided in the middle of the front cover, which is inserted and positioned to fit with the front cover positioning mounting platform on the valve core. Four screw through holes and three positioning spherical holes are provided around the positioning mounting hole, wherein the four screw through holes are aligned with the four front mounting screw holes at the front end of the valve body, and the front cover is fixed to the front end of the valve body by mounting screws.

[0010] Furthermore, the handle is a rhomboid block shape, with a mounting hole at its center. The mounting hole consists of a rear section and a front section. The shape of the rear section matches the shape of the handle connection section on the valve core, and the front section is used to accommodate a nut. The handle is inserted into the front end of the valve core through the mounting hole in a circumferentially limited manner, and the handle is fixedly connected to the front end of the valve core by locking the nut to the external thread section of the front end of the valve core. Spherical positioning grooves and limiting pins are provided on the rear side of the handle, and the edge of the limiting pin forms an arc contact with the concave arc surface on the front end cover.

[0011] Furthermore, the rear end cover is in the shape of a long plate, with screw through holes at both ends. The two screw through holes are aligned with the two rear mounting screws at the rear end of the valve body, and the rear end cover is fixed to the rear end of the valve body by means of the mounting screws. A through hole is provided on the rear end cover between the two screw through holes, which can form a snap fit with the rear end cover mounting neck on the valve core. The through hole is formed by the intersection of large and small round holes. The outer diameter of the small round hole matches the outer diameter of the rear end cover mounting neck, and the outer diameter of the large round hole is not less than the outer diameter of the valve core located at the rear of the rear end cover mounting neck.

[0012] The advantages and positive effects of this invention are as follows: 1. This invention employs a three-layer structure consisting of a valve core, valve sleeve, and valve body. The oil circuit is opened and closed via radial connecting holes and axial grooves. This ensures that impurities in the hydraulic oil do not accumulate in the valve sleeve or enter the space between the valve core and valve sleeve, thus preventing them from affecting the directional valve's switching operation, even at different valve positions. Therefore, the aforementioned rotary manual directional valve has superior anti-contamination capabilities compared to a spool-type manual directional valve. 2. The present invention is a rotary valve structure. By cooperating with the positioning ball of the positioning structure and the spherical positioning groove on the rotary handle, the manual directional valve can be well maintained in a fixed valve position and the switching operation is convenient. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0014] Figure 1 This is an overall sectional view of the positioning rotary manual reversing valve of the present invention; Figure 2a This is a front view of the valve body of the present invention; Figure 2b yes Figure 2a AA section view; Figure 2c This is a rear view of the valve body of the present invention; Figure 2d This is a top view of the valve body of the present invention; Figure 2e This is a bottom view of the valve body of the present invention; Figure 3a This is a front view of the valve core of the present invention; Figure 3b yes Figure 3a BB section view; Figure 4a This is a front view of the valve core of the present invention; Figure 4b yes Figure 4a CC section view; Figure 4c This is a left view of the valve core of the present invention; Figure 4d yes Figure 4c DD sectional view; Figure 4e This is a top view of the valve core of the present invention; Figure 4f This is a bottom view of the valve core of the present invention; Figure 5 This is a schematic diagram of the front cover of the present invention; Figure 6 This is a schematic diagram of the structure of the rear end cover of the present invention; Figure 7a This is a front view of the rotating handle of the present invention; Figure 7b yes Figure 7a EE sectional view; Figure 7c This is a left view of the rotating handle of the present invention; Figure 7d This is a top view of the rotating handle of the present invention; Figure 8 This is a schematic diagram of the structure of the present invention in valve position 1 (oil port P is connected to oil port A, and oil port T is connected to oil port B); Figure 8 In the middle: the red arrow indicates the direction of pressure oil (P) flow, and the blue arrow indicates the direction of return oil (T) flow; Figure 9 This is a schematic diagram of the structure of the valve in position 2 of the present invention (oil port P is connected to oil port B, and oil port T is connected to oil port A); Figure 9 In the center: the red arrow indicates the direction of pressure oil (P) flow, and the blue arrow indicates the direction of return oil (T) flow. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] This invention discloses a positioning rotary manual directional valve; please refer to [link / reference]. Figures 1-9 The valve can be integrated onto the surface of a hydraulic valve block via plate mounting, including: Valve body 1: The valve body 1 is nearly cuboid in shape. The front end of the valve body 1 has four front mounting screw holes 1.3 and three positioning holes 1.2, and the rear end has two rear mounting screw holes 1.6. A valve sleeve mounting through hole 1.1 is provided in the middle of the valve body along the front-to-back direction. Four annular grooves 1.4 are spaced apart along the axial direction of the valve sleeve mounting through hole. Four lower through holes 1.5 are respectively provided between the four annular grooves and the oil ports B1.10, P1.8, A1.9, and T1.11 at the bottom of the valve body. Four vertically oriented rectangular through holes 1.7 are provided on the valve body at positions offset from the valve core mounting hole and the four lower through holes. There are two through holes on each side of the four through holes. These four through holes are used to install screws, thereby fixing the positioning rotary manual directional valve of this invention onto the surface of the hydraulic valve block.

[0017] Valve sleeve 2: The valve sleeve 2 is a cylinder, the outer diameter of which matches the diameter of the valve sleeve mounting through hole on the valve body. A valve core mounting through hole 2.1 is provided at the center of the valve sleeve. Four annular grooves are axially spaced on the outer surface of the valve sleeve, and sealing ring mounting grooves 2.2 are provided on both sides of the four annular grooves. Radial connecting holes are provided between each of the four annular grooves and the valve core mounting through hole. From front to back, the four radial connecting holes are the first radial connecting hole 2.6, the second radial connecting hole 2.5, the third radial connecting hole 2.4, and the fourth radial connecting hole 2.3. A fifth radial connecting hole 2.7 is provided opposite to the second radial connecting hole. The valve sleeve is installed in the valve sleeve mounting through hole on the valve body, and the four annular grooves on the valve sleeve are aligned one-to-one with the four annular grooves on the valve body. A sealing ring 11 is installed in each sealing ring mounting groove on the valve sleeve, so that the valve body and the valve sleeve form a control cavity between two adjacent sealing rings. This control cavity is connected to the corresponding radial connecting hole on the valve sleeve and the corresponding lower through hole on the valve body, forming four isolated oil supply branches.

[0018] The valve core 3 has an outer diameter that matches the diameter of the valve core mounting through hole in the valve sleeve. The length of the valve core is greater than the length of the valve sleeve. The valve core is inserted into the valve core mounting hole in the valve sleeve with both its front and rear ends exposed. A blind hole 3.3 communicating with the rear end of the valve core is provided at the center of the valve core. A sealing plug 10 is fixed to the open end of the blind hole to achieve a seal. On the same azimuth plane A of the valve core, from front to back, there are three radial connecting holes: a first radial connecting hole 3.4, a second radial connecting hole 3.2, and a third radial connecting hole 3.1. On the same azimuth plane B of the valve core, from front to back, there are two radial connecting holes: a fourth radial connecting hole 3.10 and a fifth radial connecting hole 3.8. Azimuth plane B and azimuth plane A are set at a 90° angle. The fourth radial connecting hole and the first radial connecting hole are located in the same radial position, and the fifth radial connecting hole and the third radial connecting hole are located in the same radial position. A first axial groove 3.9 is provided on the outer surface of the valve core, located between the fourth radial connecting hole and the fifth radial connecting hole of the valve core. A second axial groove 3.7 and a third axial groove 3.6 are provided on the front and back of the outer surface of the valve core opposite to the first axial groove.

[0019] The first radial connecting hole, the fourth radial connecting hole, and the second axial long groove on the valve core 3 are radially aligned with the first radial connecting hole on the valve sleeve; the first axial long groove and the second axial long groove on the valve core are radially aligned with the second radial connecting hole and the fifth radial connecting hole on the valve sleeve; the second radial connecting hole, the first axial long groove, and the third axial long groove on the valve core are radially aligned with the third radial connecting hole on the valve sleeve; the third radial connecting hole and the fifth radial connecting hole on the valve core are radially aligned with the fourth radial connecting hole on the valve sleeve. A sealing ring mounting groove 3.5 is provided in the middle of the valve core near both ends. The sealing rings are installed to achieve a seal with the valve core mounting holes of the valve sleeve at both ends. A rear end cap mounting neck is provided at the rear end of the valve core, and a front end cap positioning mounting platform is provided at the front end of the valve core, connecting to the middle of the valve core. The front end cap positioning platform has two parallel, opposite milled positioning surfaces. The front end of the valve core consists of an externally threaded section and a rotating handle connecting section connected sequentially. The rotating handle connecting section adopts a regular polygonal prism structure, such as the square prism shown in the attached figure.

[0020] The valve body has three positioning holes located at the bottom and on the left and right sides, respectively. The positioning hole on the left is the first positioning hole, the positioning hole on the right is the second positioning hole, and the positioning hole at the bottom is the third positioning hole. Each positioning hole on the valve body contains a positioning structure, which includes a positioning spring 8 and a positioning ball 7. The positioning spring is installed on the inner side of the positioning hole, and the positioning ball is installed on the outer side of the positioning hole.

[0021] The front cover 4 is nearly circular, with a recessed arc surface 4.3 on a portion of its outer circumference. A positioning mounting hole 4.1 is located in the center of the front cover, the shape of which matches the shape of the front cover positioning mounting platform on the valve core. Four screw through holes 4.2 and three locating spherical holes 4.4 are located around the positioning mounting hole. The four screw through holes align with the four front mounting screw holes on the front of the valve body, allowing the front cover to be fixed to the front of the valve body using mounting screws. The three locating spherical holes align with the three locating holes on the front of the valve body. When the front cover 4 is installed on the front of the valve body, the locating ball is compressed, thereby compressing the spring. Under the spring force, part of the locating ball extends beyond the front surface of the front cover 4 through the locating spherical holes on the front cover 4.

[0022] The rotary handle 5 can be a diamond-shaped block as shown in the attached drawing. A mounting hole is provided at the center of the rotary handle, consisting of a rear section 5.1 and a front section 5.2. The shape of the rear section matches the shape of the rotary handle connecting section on the valve core, and the front section is used to accommodate a nut. The rotary handle is inserted into the front end of the valve core through the mounting hole in a circumferentially limited manner, and a nut 6 is tightened onto the externally threaded section of the front end of the valve core to achieve a fixed connection between the rotary handle and the front end of the valve core. Spherical positioning grooves 5.3 and limiting pins 5.4 are provided along the upper and lower sides of the rear side of the rotary handle. The function of the spherical positioning groove is that the portion of the positioning ball extending from the spherical positioning hole of the front cover 4 is engaged in the spherical positioning groove on the rotary handle. Rotating the rotary handle to the corresponding angle causes the positioning balls in different positioning holes to engage in the spherical positioning groove of the rotary handle, thus fixing the directional valve in different valve positions. The function of the limiting pin is as follows: the edge of the limiting pin on the rotating handle makes arc contact with the concave arc surface on the front cover 4, ensuring that the rotating handle moves within the range of the concave arc surface of the front cover 4, thus playing a limiting role.

[0023] The rear end cover 9 is elongated and has screw holes 9.1 at both ends. These two screw holes align with the two rear mounting screws at the rear of the valve body, allowing the rear end cover to be fixed to the rear of the valve body. A through hole 9.2 is located between the two screw holes on the rear end cover, allowing it to engage with the rear end cover mounting neck on the valve core. This through hole is formed by the intersection of large and small circular holes. The outer diameter of the smaller circular hole matches the outer diameter of the rear end cover mounting neck, while the outer diameter of the larger circular hole is not less than the outer diameter of the portion of the valve core located behind the rear end cover mounting neck. This facilitates the installation of the rear end cover and the valve core, and also allows for observation of the valve core's movement when rotating the handle.

[0024] Working principle of this positioning rotary manual directional valve: During operation, pressurized oil enters the second radial connecting hole and the fifth radial connecting hole on the valve sleeve 2 through the oil port P on the valve body. If the fifth radial connecting hole is not aligned with the first axial groove or the second axial groove at this time, the on / off state of the oil port is as follows: Figure 1 As shown, at this time, the on / off relationship is that the first radial connecting hole, the second radial connecting hole, and the third radial connecting hole on the valve core 3 are connected to the first radial connecting hole, the third radial connecting hole, and the fourth radial connecting hole on the valve sleeve 2. Finally, the oil ports T, A, and B on the valve body 1 are connected, while the oil port P is not connected to the other oil ports. At this time, the directional valve is in the neutral position, and the spherical positioning groove of the rotating handle is engaged with the positioning ball in the second positioning hole of the valve body 1. At this time, impurities in the hydraulic oil will only be deposited in the blind hole of the valve core and will not enter between the valve core and the valve sleeve to affect the directional valve switching.

[0025] Rotating the rotary handle causes the valve core to rotate. When the spherical positioning groove of the rotary handle engages with the positioning ball in the first positioning hole of the valve body 1, pressurized oil enters the second radial connecting hole of the valve sleeve 2 through port P, then enters the second axial groove, flows into the first radial connecting hole of the valve sleeve through the second axial groove, and finally flows out from port A. The third and fourth radial connecting holes of the valve sleeve 2 are connected through the third axial groove on the valve core 3, ultimately connecting ports T and B on the valve body 1. At this point, port P connects to port A, and port T connects to port B; the valve core position is as follows. Figure 8 As shown. At this time, impurities in the hydraulic oil will only deposit in the second and third axial grooves and will not enter between the valve core and the valve sleeve, affecting the switching of the directional valve.

[0026] Rotating the handle causes the valve core to rotate. When the spherical positioning groove of the handle engages with the positioning ball in the third positioning hole of the valve body 1, pressurized oil enters the second radial communication port of the valve sleeve 2 through port P, then enters the first axial groove, flows through the first axial groove into the third radial communication port of the valve sleeve 2, and finally flows out from port B. The first and fourth radial communication ports on the valve sleeve 2 are connected to the fourth and fifth radial communication ports on the valve core 3, respectively. The fourth and fifth radial communication ports on the valve core 3 are connected through blind holes in the valve core. Finally, ports T and A on the valve body 1 are connected together, so that port P connects to port B and port T connects to port A. The valve core position is as follows: Figure 9 As shown. At this time, impurities in the hydraulic oil will only deposit in the blind hole 3b and the first axial groove, and will not enter between the valve core and the valve sleeve to affect the switching of the directional valve.

[0027] In summary, regardless of the valve position, impurities in the hydraulic oil will not deposit in the valve sleeve, nor will they enter the space between the valve core and the valve sleeve, affecting the directional control valve's switching. Therefore, the rotary manual directional control valve described above has superior anti-contamination capabilities compared to the spool-type manual directional control valve.

[0028] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0029] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A positioning rotary manual directional valve, characterized in that: Includes valve body, valve sleeve, valve core, front cover, rotary handle, and rear cover; The valve sleeve is installed in the valve sleeve mounting through hole on the valve body in the front-to-back direction, forming four sealed and isolated control chambers between the valve sleeve and the valve body. The four control chambers are connected to the corresponding radial connecting holes on the valve sleeve and the corresponding lower through holes on the valve body, forming four isolated oil supply branches, which are respectively connected to the oil port T, oil port A, oil port B and oil port P at the lower end of the valve body. The front end cover and the rear end cover are fixedly installed on the front end and the rear end of the valve body, respectively, so that the valve core is rotatably installed in the valve core mounting through hole of the valve sleeve in a way that is limited along the axial direction, and the two ends of the valve core and the valve sleeve are in sealed contact; a blind hole is provided in the center of the valve core, and multiple radial connecting holes and multiple axial long grooves are provided that communicate with the blind hole in the center. Three positioning holes are provided at the front end of the valve body, located on the left and right sides and the bottom respectively. A positioning structure is installed in each positioning hole. The positioning structure includes a positioning spring and a positioning ball. The positioning spring is installed in the inner position of the positioning hole, and the positioning ball is installed in the outer position of the positioning hole. The positioning ball is limited by the positioning ball hole provided on the rear side of the front end cover. The rotating handle is fixedly connected to the front end of the valve core, and a spherical positioning groove that cooperates with the positioning ball is provided on the rear side of the rotating handle.

2. The positioning rotary manual directional valve according to claim 1, characterized in that: The valve body has four front mounting screw holes at the front end, which are fixedly connected to the front end cover by screws; the valve body has two rear mounting screw holes at the rear end, which are fixedly connected to the rear end cover by screws; four annular grooves are provided axially along the valve sleeve mounting through hole in the valve body, and four lower through holes are provided between the four annular grooves and the oil port B, oil port P, oil port A and oil port T at the bottom of the valve body.

3. The positioning rotary manual directional valve according to claim 2, characterized in that: Four annular grooves are axially spaced on the outer circumference of the valve sleeve, and sealing ring mounting grooves are provided on both sides of the four annular grooves. Radial connecting holes are provided between the four annular grooves and the valve core mounting through hole. From front to back, the four radial connecting holes are the first radial connecting hole, the second radial connecting hole, the third radial connecting hole, and the fourth radial connecting hole of the valve sleeve. A fifth radial connecting hole is provided on the opposite side of the second radial connecting hole of the valve sleeve. The four annular grooves on the valve sleeve are aligned with the four annular grooves on the valve body. A sealing ring is installed in each sealing ring mounting groove on the valve sleeve, so that the valve body and the valve sleeve form a control cavity between two adjacent sealing rings.

4. The positioning rotary manual directional valve according to claim 3, characterized in that: A first radial connecting hole, a second radial connecting hole, and a third radial connecting hole are arranged from front to back on the same orientation plane A of the valve core. A fourth radial connecting hole and a fifth radial connecting hole are arranged from front to back on the same orientation plane B of the valve core. The orientation plane B and the orientation plane A are arranged at a 90° angle. The fourth radial connecting hole and the first radial connecting hole are located at the same radial position, and the fifth radial connecting hole and the third radial connecting hole are located at the same radial position. A first axial groove is provided on the outer surface of the valve core between the fourth and fifth radial connecting holes. A second axial groove and a third axial groove are provided on the inner and outer surfaces of the valve core opposite to the first axial groove. The first radial connecting hole, the fourth radial connecting hole, and the second axial long groove of the valve core are radially aligned with the first radial connecting hole of the valve sleeve; the first axial long groove and the second axial long groove are radially aligned with the second radial connecting hole and the fifth radial connecting hole of the valve sleeve; the second radial connecting hole, the first axial long groove, and the third axial long groove of the valve core are radially aligned with the third radial connecting hole of the valve sleeve; the third radial connecting hole and the fifth radial connecting hole of the valve core are radially aligned with the fourth radial connecting hole of the valve sleeve.

5. The positioning rotary manual directional valve according to claim 2, characterized in that: A sealing ring mounting groove is provided in the middle of the valve core near both ends. The sealing ring is installed to achieve a seal with the valve core mounting hole of the valve sleeve at both ends. A rear end cover mounting neck is provided at the rear end of the valve core. A front end cover positioning mounting platform is provided at the front end of the valve core, which is connected to the middle of the valve core. Two parallel milled positioning surfaces are provided on the front end cover positioning platform. The front end of the valve core is composed of an external thread section and a handle connecting section connected in sequence.

6. The positioning rotary manual directional valve according to claim 5, characterized in that: A portion of the outer ring of the front cover is provided with a recessed arc surface, and a positioning mounting hole is provided in the middle of the front cover, which is inserted and positioned with the front cover positioning mounting platform on the valve core. Four screw through holes and three positioning spherical holes are provided around the positioning mounting hole. The four screw through holes are aligned with the four front mounting screw holes at the front end of the valve body. The front cover is fixed to the front end of the valve body by mounting screws.

7. The positioning rotary manual directional valve according to claim 5, characterized in that: The handle is a rhomboid block shape, with a mounting hole at its center. The mounting hole consists of a rear section and a front section. The shape of the rear section matches the shape of the handle connection section on the valve core, and the front section is used to accommodate a nut. The handle is inserted into the front end of the valve core through the mounting hole in a circumferentially limited manner, and the handle is fixedly connected to the front end of the valve core by locking the nut on the external threaded section of the front end of the valve core. Spherical positioning grooves and limiting pins are provided on the rear side of the handle, and the edge of the limiting pin forms an arc contact with the concave arc surface on the front end cover.

8. The positioning rotary manual directional valve according to claim 5, characterized in that: The rear end cover is in the shape of a long plate, with screw holes at both ends. The two screw holes are aligned with the two rear mounting screws at the rear end of the valve body. The rear end cover is fixed to the rear end of the valve body by the mounting screws. A through hole is provided on the rear end cover between the two screw holes, which can form a snap fit with the rear end cover mounting neck on the valve core. The through hole is formed by the intersection of large and small round holes. The outer diameter of the small round hole matches the outer diameter of the rear end cover mounting neck, and the outer diameter of the large round hole is not less than the outer diameter of the valve core located at the rear of the rear end cover mounting neck.

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