Precise manual proportional combination valve

Abstract

The utility model discloses a precise manual proportional combination valve which comprises a valve body, a valve body end cover, a valve base, a valve side cover, a side cover base, an overflow valve, a flow guide valve element, a transmission assembly and an operation valve rod, the valve body end cover is fixed to the end face of one side of the valve body through screws, and the valve base is fixed to the end face of the other side of the valve body through screws. A valve side cover is fixed to one side of the valve body through screws, a side cover base is fixed to the end face of one side of the valve side cover through screws, an overflow valve is fixedly embedded in the other side of the valve side cover, a main hole communicated with the valve body end cover and the valve base is connected between the end walls of the two sides of the valve body, and the valve body end cover and the valve base can be adjusted by adjusting the position of the flow guide valve element. The flow of fluid between different input holes and output holes can be accurately controlled, the flow can be adjusted in proportion, the proportional control capability enables the valve to realize stepless speed change, the control requirements of various fluids are met, and the multifunctionality and applicability of the combination valve are enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to composite valve technical field especially is related to a precision manual proportional composite valve. BACKGROUND

[0002] The proportional composite valve is a kind of composite valve for simultaneously controlling pressure and flow in hydraulic system, it combines the function of proportional pressure valve and proportional flow valve, proportional composite valve (such as P-Q valve) can carry out proportional control to the speed and output force or torque of different working states of execution element (hydraulic cylinder or hydraulic motor), it is composed of pilot proportional overflow valve and proportional flow valve, the pressure and flow of hydraulic system are controlled by two-way electric signal, the electric-mechanical conversion element of P-Q valve converts electric signal into the movement of valve core, the pressure and flow of fluid are controlled by the movement of valve core, and the proportional conversion of electric-mechanical-fluid is completed;

[0003] Chinese patent publication No. CN218913314U discloses a kind of for docking ship manual composite proportional valve, including hand reversing valve, main valve body, throttle control part, pressure reducing control part and shuttle valve part, six screw holes are on the upper surface of main valve body, hand reversing valve is fixed on the upper surface of main valve body by four inner hexagonal screws one and two inner hexagonal screws two, four screw holes are on the side of main valve body, throttle control part is fixed on the side of main valve body by four inner hexagonal screws three, pressure reducing control part and shuttle valve part are inserted into the hole in the side of main valve body, the manual composite proportional valve for docking ship, the control loop of anchor gear motor is improved, hand reversing valve, pressure reducing valve and throttle valve are stacked together to realize oil circuit control, can reduce the impact of oil liquid on anchor gear motor when passing through hand reversing valve and the impact of anchor hook on motor during the process of descending, thereby playing the safety protection effect to motor;

[0004] However, with the increasingly complex application scenarios of hydraulic system, the performance requirements of composite valve are continuously improved.The above prior art has obvious limitations, and its function is relatively single, which is difficult to effectively guarantee the safe and stable operation of hydraulic system under the complex working conditions of multiple passages.For example, when facing multiple input sources and different working requirements, it is difficult to accurately realize proportional mixing control of multiple liquids, and it is also difficult to ensure that the system does not appear backflow, pressure overload and other safety problems under the condition of complex pressure and flow changes.In addition, for the application scenarios requiring stepless speed control, the existing technology cannot provide sufficient accurate and flexible adjustment capability.Therefore, in order to meet the needs of hydraulic system in multiple passages, high precision and high safety, an more precise and powerful manual proportional composite valve is urgently needed to solve the problems existing in the prior art and improve the overall performance and reliability of hydraulic system. UTILITY MODEL CONTENTS

[0005] The utility model discloses a precision manual proportional composite valve to solve the problem of the relatively single function of the traditional composite proportional valve in the above background technology.

[0006] To achieve the above object, the technical problem is solved by the utility model as follows:

[0007] A precision manual proportional composite valve, including valve main body, valve body end cover, valve base, valve side cover, side cover base, overflow valve, flow guide valve core, transmission assembly and operating valve rod, the valve body end cover is fixed with screw on the one side end face of valve main body, the valve base is fixed with screw on the other side end face of valve main body, the valve side cover is fixed with screw on the one side of valve main body, the side cover base is fixed with screw on the one side end face of valve side cover, the overflow valve is fixedly embedded on the other side of valve side cover, wherein, the main hole that is communicated with valve body end cover, valve base is connected between the two side end walls of valve main body, the first input hole, second input hole, third input hole and fourth input hole are sequentially arranged along the axial direction of main hole, the output hole is arranged in valve base, the three -way hole is arranged in valve side cover, two end ports of three -way hole are communicated with first input hole and third input hole respectively, the overflow valve is fixedly embedded in another port of three -way hole, the flow guide valve core that is matched with hole is slidably embedded in main hole, and the transmission assembly is installed in valve body end cover, the operating valve rod is connected to one end of transmission assembly and passes out valve body end cover, and one end of transmission assembly is connected with flow guide valve core.

[0008] As a further scheme of the utility model, the flow guide valve core is hollow structure and is provided with an open side towards the valve base, the first proportional hole group, the second proportional hole group and the third proportional hole group are sequentially arranged along the axial direction of the flow guide valve core, the first proportional hole group can correspond to one of the first input hole and the three -way hole, the second proportional hole group can correspond to the second input hole, the third proportional hole group can correspond to the fourth input hole, and the flow guide groove is arranged on the outer side of the flow guide valve core and at the position corresponding to the third input hole and the other port of the three -way hole.

[0009] As a further scheme of the utility model, the side cover base is embedded on the intersection position side wall of the three -way hole, the valve cylinder is fixed on one side of the side cover base, the valve head is slidably embedded in the valve cylinder, the first spring is fixedly connected between the valve head and the inner end wall of the valve cylinder, and the port channel of the valve cylinder and the three -way hole communicated with the third input hole is opposite.

[0010] As a further scheme of the utility model, the openings of the first input hole and the third input hole are located on different side faces of the valve main body with the openings of the second input hole and the fourth input hole.

[0011] As a further scheme of the utility model, the transmission assembly includes a rack fixedly connected with the flow guide valve core in the valve body end cover, one side of the rack is meshed with a gear, a transmission shaft is fixedly sleeved in the middle of the gear, both ends of the transmission shaft are rotationally connected with the valve body end cover, and one end of the transmission shaft penetrates through the valve body end cover and is fixedly connected with an operation valve rod.

[0012] As a further scheme of the utility model, one side of the valve body end cover is fixedly connected with a protruding block, a long bolt is threadedly connected in the protruding block, a hexagonal end of the long bolt can abut against the operation valve rod, and the outer side of the long bolt is threadedly connected with a limiting nut.

[0013] As a further scheme of the utility model, a center rod is arranged on the end face of the valve body end cover, a yoke is sleeved outside the center rod, the operation valve rod is arranged in the bifurcated position of the yoke, and one end of the yoke, which is away from the operation valve rod, corresponds to a scale mark arranged on the end face of the valve body end cover.

[0014] As a further scheme of the utility model, a screw cylinder is fixedly embedded in the side face of the valve body end cover, a hollow bolt is threadedly connected with one end of the screw cylinder, a locking head is slidingly embedded in the other end of the screw cylinder, a second spring is arranged between the locking head and the screw cylinder in a limiting mode, and a cut groove is arranged in the side, where the flow guide valve core is located, of the valve body end cover.

[0015] Compared with the prior art, the utility model has the advantages that:

[0016] The utility model discloses a precise manual proportional composite valve, can realize three position four way reversing function, can accurately control fluid flow between different input holes and output holes through adjusting the position of the flow guide valve core, realizes flow proportional adjustment, and this proportional control ability makes the composite valve be stepless speed change, satisfies various fluid control demand, enhances the multifunctionality and applicability of the composite valve.

[0017] The utility model discloses a precise manual proportional composite valve, has the safety mechanism of preventing liquid backflow and excessive pressure, when the liquid hydraulic pressure of the second input hole is too large, the first spring will push the valve head and block the three -way hole, prevents liquid backflow, simultaneously, when the liquid pressure of the third input hole is too large, the overflow valve will open pressure relief, prevents system damage, and these designs ensure the stability and safety of the hydraulic system.

[0018] The utility model discloses a precision manual proportional composite valve, and the operation design is simple and direct perception, through holding operation valve stem rotation transmission shaft, can drive gear mesh rack, promotes the diversion valve core adjustment position, realizes fluid control, in addition, the compact structure and reasonable layout of composite valve make the maintenance and replacement part become convenient, improve the maintenance efficiency, the design of locking head and long bolt still allows composite valve to keep off state or single liquid output state when needing, further simplifies the operation process. BRIEF DESCRIPTION OF DRAWINGS

[0019] The utility model is further explained below in connection with the drawings and examples:

[0020] Figure 1 It is the three-dimensional structure of the utility model's precision manual proportional composite valve Figure 1 ;

[0021] Figure 2 It is the three-dimensional structure of the utility model's precision manual proportional composite valve Figure 2 ;

[0022] Figure 3 It is the sectional view of the utility model's precision manual proportional composite valve;

[0023] Figure 4 It is the side view of the utility model's precision manual proportional composite valve;

[0024] Figure 5 It is the structure enlarged view of A place in the utility model's precision manual proportional composite valve Figure 3 ;

[0025] Figure 6 It is the structure enlarged view of B place in the utility model's precision manual proportional composite valve Figure 3 .

[0026] In the drawings, the component list represented by each sign is as follows:

[0027] 1, valve main body;11, main hole;12, first input hole;13, second input hole;14, third input hole;15, fourth input hole;2, valve body end cover;21, lug;22, long bolt;23, limit nut;24, center rod;25, shift fork;26, screw cylinder;27, hollow bolt;28, locking head;29, second spring;3, valve base;31, output hole;4, valve side cover;41, three-way hole;5, side cover base;51, valve cylinder;52, valve head;53, first spring;6, overflow valve;7, diversion valve core;71, first proportional hole group;72, second proportional hole group;73, third proportional hole group;74, diversion groove;8, transmission assembly;81, rack;82, gear;83, transmission shaft;9, operation valve rod. DETAILED DESCRIPTION

[0028] The utility model is further described below in combination with the embodiments.

[0029] Please refer to Figures 1-6 The utility model provides a precision manual proportional composite valve, including valve main body 1, valve body end cover 2, valve base 3, valve side cover 4, side cover base 5, overflow valve 6, flow guide valve element 7, transmission assembly 8 and operating valve stem 9, the valve body end cover 2 is fixed with on one side end surface of valve main body 1, the valve base 3 is fixed with on the other side end surface of valve main body 1, the valve side cover 4 is fixed with on one side of valve main body 1, the side cover base 5 is fixed with on one side end surface of valve side cover 4, overflow valve 6 is embedded and fixed on the other side of valve side cover 4;

[0030] Specifically, valve main body 1, valve body end cover 2, valve base 3, valve side cover 4, side cover base 5, overflow valve 6 constitute a closed space in common, and the output path of proportional composite valve can be changed by transmission assembly 8 and operating valve stem 9 control flow guide valve element 7 changes its position in the closed space, it is worth mentioning that valve body end cover 2, valve base 3, valve side cover 4, side cover base 5, overflow valve 6 are all provided with static sealing structure on the contact surface of valve main body 1, and flow guide valve element 7 is provided with dynamic sealing structure on the contact surface of valve main body 1, to guarantee that proportional composite valve can run stably.

[0031] Further, transmission assembly 8 is installed in valve body end cover 2, one end of transmission assembly 8 is connected with operating valve stem 9 and passes out valve body end cover 2, one end of transmission assembly 8 is connected with flow guide valve element 7, transmission assembly 8 includes rack 81 in valve body end cover 2 and is fixed with flow guide valve element 7, one side of rack 81 is connected with gear 82 in meshing, the middle part of gear 82 is fixed with transmission shaft 83, both ends of transmission shaft 83 are rotationally connected with valve body end cover 2, and one end of transmission shaft 83 is fixed with operating valve stem 9 and passes out valve body end cover 2;

[0032] Specifically, one end of the transmission shaft 83 penetrates the valve body end cover 2 and is fixed with the operating valve rod 9, so that the rotation of the operating valve rod 9 can be directly transmitted to the transmission shaft 83, and then drive the gear 82 and the rack 81. The operator can directly drive the transmission shaft 83 to rotate by rotating the operating valve rod 9, and then drive the gear 82 and the rack 81 to realize accurate adjustment of the position of the flow guide valve core 7. The transmission assembly 8 is responsible for converting the rotary motion of the operating valve rod 9 into the linear motion of the flow guide valve core 7 to accurately control its position. The assembly is mainly composed of the rack 81, the gear 82 and the transmission shaft 83. Among them, the rack 81 is located in the valve body end cover 2 and is fixedly connected with the flow guide valve core 7 by screws, the gear 82 is engaged with the rack 81, and the middle part is fixedly sleeved with the transmission shaft 83, the transmission shaft 83 is rotatably connected with the valve body end cover 2 at both ends, and the operating valve rod 9 is fixed on one end of the transmission shaft 83 and penetrates the valve body end cover 2. When the operating valve rod 9 is rotated, the transmission shaft 83 is rotated, the gear 82 is rotated, and then the rack 81 is linearly moved, and finally the accurate regulation and control of the position of the flow guide valve core 7 is realized.

[0033] Further, one side of the valve body end cover 2 is fixedly connected with a protrusion 21, the protrusion 21 is threadedly connected with a long bolt 22, the hexagonal end of the long bolt 22 can abut against the operating valve rod 9, and the outer side of the long bolt 22 is threadedly connected with a limiting nut 23;

[0034] Specifically, the long bolt 22 can contact the operating valve rod 9 through its hexagonal end, thereby limiting the movement or fixing the position of the operating valve rod 9. By tightening or loosening the limiting nut 23, the fastening degree of the long bolt 22 can be adjusted, thereby adjusting the position of the operating valve rod 9 or fixing the operating valve rod 9 at a specific position. By adjusting the limiting nut 23, the operating valve rod 9 can be fixed at a specific position, ensuring that the composite valve remains in the closed state or the single-liquid output state when needed.

[0035] Further, a center rod 24 is provided on the end face of the valve body end cover 2, the outer side of the center rod 24 is sleeved with a yoke 25, the operating valve rod 9 is arranged in the bifurcated position of the yoke 25, and the end of the yoke 25 away from the operating valve rod 9 corresponds to the scale mark on the end face of the valve body end cover 2.

[0036] Specifically, the operator can rotate the operating valve rod 9 to drive the yoke 25 and the center rod 24 to rotate, and then push or pull the flow guide valve core 7, thereby realizing accurate control of fluid flow. The scale mark is a series of marks on the end face of the valve body end cover 2, corresponding to one end of the yoke 25. The operator can intuitively understand the position of the operating valve rod 9 through these scale marks, thereby judging the working state of the composite valve, such as full opening, full closing or any position in the middle.

[0037] Further, the valve body end cover 2 side is fixedly embedded with a screw cylinder 26, one end of the screw cylinder 26 is threadedly connected with a hollow bolt 27, the other end of the screw cylinder 26 is slidingly embedded with a locking head 28, a second spring 29 is arranged in position between the locking head 28 and the screw cylinder 26, and the flow guide valve core 7 is located on one side of the valve body end cover 2 and corresponds to the locking head 28 and is provided with a cut groove;

[0038] Specifically, when the locking head 28 is embedded in the cut groove of the flow guide valve core 7, the position of the flow guide valve core 7 can be fixed, so that the proportional output of the composite valve is stable, the second spring 29 can ensure that the locking head 28 is kept in a proper position in the screw cylinder 26, preventing the locking head 28 from being displaced due to pressure changes or other external forces, by rotating the hollow bolt 27, the compression degree of the second spring 29 can be changed, and then the locking pressure of the locking head 28 can be controlled, improving the stability and safety of the system.

[0039] Further, the two side walls of the valve body 1 are connected with a main hole 11 which is communicated with the valve body end cover 2 and the valve base 3, the main hole 11 is sequentially provided with a first input hole 12, a second input hole 13, a third input hole 14 and a fourth input hole 15 along its axial direction, the valve base 3 is provided with an output hole 31, the valve side cover 4 is provided with a three-way hole 41, two end ports of the three-way hole 41 are respectively communicated with the first input hole 12 and the third input hole 14, the other port of the three-way hole 41 is fixedly embedded with an overflow valve 6, the main hole 11 is slidingly embedded with a flow guide valve core 7 matched with the hole, the flow guide valve core 7 is a hollow structure and its side facing the valve base 3 is provided with an open end, the flow guide valve core 7 is sequentially provided with a first proportional hole group 71, a second proportional hole group 72 and a third proportional hole group 73 along its axial direction, the first proportional hole group 71 can correspond to one of the first input hole 12 and the three-way hole 41, the second proportional hole group 72 can correspond to the second input hole 13, and the third proportional hole group 73 can correspond to the fourth input hole 15, a flow guide groove 74 is arranged on the outside of the flow guide valve core 7 and corresponds to the third input hole 14 and the other port of the three-way hole 41;

[0040] Specifically, the flow guide valve core 7 controls the fluid flow between different input holes and the output hole 31, realizes proportional adjustment of flow, by adjusting the position of the flow guide valve core 7, the cross-sectional area of each proportional hole group can be changed, thereby changing the flow and pressure of the fluid, realizing stepless speed change and accurate proportional control, so that the composite valve can meet various fluid control requirements, and the multifunctionality and applicability of the composite valve are enhanced. When the first proportional hole group 71 is aligned with the first input hole 12, the second proportional hole group 72 is aligned with the second input hole 13, the flow guide groove 74 is aligned with the adjacent ports of the three-way hole 41 and the third input hole 14, and the third proportional hole group 73 is not aligned with the fourth input hole 15, the liquid in the first input hole 12 will enter the flow guide valve core 7 from the first proportional hole group 71, the liquid in the third input hole 14 can push the valve head 52 to retract into the valve barrel 51 after entering the adjacent ports of the three-way hole 41, thereby enabling the liquid to also enter the flow guide valve core 7 from the first proportional hole group 71, the liquid in the second input hole 13 will enter the flow guide valve core 7 from the second proportional hole group 72, and by fine-tuning the position of the flow guide valve core 7, the cross-sectional area of the proportional hole group can be changed, and proportional output can be achieved. When the first proportional hole group 71 is not aligned with the first input hole 12, the second proportional hole group 72 is not aligned with the second input hole 13, the flow guide groove 74 is not aligned with the adjacent ports of the three-way hole 41 and the third input hole 14, and the third proportional hole group 73 is not aligned with the fourth input hole 15, then the liquid output can be terminated; when the first proportional hole group 71 is not aligned with the first input hole 12, the second proportional hole group 72 is not aligned with the second input hole 13, the flow guide groove 74 is not aligned with the adjacent ports of the three-way hole 41 and the third input hole 14, and the third proportional hole group 73 is aligned with the fourth input hole 15, the liquid in the fourth input hole 15 will enter the flow guide valve core 7 from the third proportional hole group 73, and when the liquid pressure in the third input hole 14 is too large, the valve head 52 will not close, and the excessive pressure will cause the overflow valve 6 to open to release pressure, preventing the liquid in the third input hole 14 from occupying the flow guide valve core 7 channel, ensuring the stability of the hydraulic system. It is worth noting that the side of the channel of the three-way hole 41 is also provided with a bifurcation, and the end of the bifurcation is fixedly embedded with a plug. In an emergency, the plug can be manually opened to release pressure.

[0041] Further, the intersection position side wall of the three-way hole 41 is embedded with a side cover base 5, one side of the side cover base 5 is fixedly connected with a valve barrel 51, the valve barrel 51 is slidably embedded with a valve head 52, the valve head 52 and the inner end wall of the valve barrel 51 are fixedly connected with a first spring 53, and the valve barrel 51 is opposite to the port channel of the three-way hole 41 and the third input hole 14;

[0042] Specifically, when the liquid hydraulic pressure in the second input hole 13 is too large, it will cause the liquid to backflow in the third input hole 14, and then the first spring 53 will push the valve head 52 to block the passage of the port corresponding to the third input hole 14 of the three-way hole 41, so as to prevent the liquid from backflowing.

[0043] Further, the openings of the first input hole 12 and the third input hole 14 are located on different sides of the valve body 1 from the openings of the second input hole 13 and the fourth input hole 15.

[0044] Specifically, such a layout helps to optimize the space utilization inside the composite valve, making the composite valve design more compact, while facilitating the arrangement of external pipelines or connectors, and the design of input holes on different sides makes it more convenient for maintenance and repair work, and workers can more easily access each input hole to perform necessary inspection and maintenance work.

[0045] Working principle: in use, hold the operating valve stem 9, rotate the transmission shaft 83, the transmission shaft 83 drives the gear 82 to engage the rack 81, the rack 81 pushes the flow valve core 7 to adjust the position, realize fluid control, so that the composite valve can stepless speed change, can realize three position four way reversing function, meet a variety of fluid control needs; when the first proportional hole group 71 is aligned with the first input hole 12, the second proportional hole group 72 is aligned with the second input hole 13, the flow guide groove 74 is aligned with the adjacent port of the third input hole 14 and the three way hole 41, the third proportional hole group 73 is not aligned with the fourth input hole 15, the liquid in the first input hole 12 will enter the flow valve core 7 from the first proportional hole group 71, the liquid in the third input hole 14 enters the adjacent port of the three way hole 41, and the valve head 52 can be pushed into the valve cylinder 51, so that the liquid can also enter the flow valve core 7 from the first proportional hole group 71, the liquid in the second input hole 13 will enter the flow valve core 7 from the second proportional hole group 72, and the position of the flow valve core 7 can be adjusted, the cross section area of the proportional hole group can be changed, so that the three kinds of liquid can be mixed in proportion and output from the output hole 31, and stepless speed change can be carried out. In this case, the second spring 29 pushes the locking head 28 to embed in the cutting groove of the flow valve core 7, the position of the flow valve core 7 can be limited, so that the proportional composite valve can keep stable proportional output. It is worth noting that when the hydraulic pressure of the liquid in the second input hole 13 is too large, the liquid in the third input hole 14 will flow back, and the first spring 53 will push the valve head 52 to block the channel of the port corresponding to the three way hole 41 and the third input hole 14. When the liquid pressure in the third input hole 14 is too large, the valve head 52 will not close, and the excessive pressure will cause the overflow valve 6 to open and release pressure, which can prevent the liquid in the third input hole 14 from occupying the channel of the flow valve core 7, and ensure the stability of the hydraulic system. When the first proportional hole group 71 is not aligned with the first input hole 12, the second proportional hole group 72 is not aligned with the second input hole 13, the flow guide groove 74 is not aligned with the adjacent port of the third input hole 14 and the three way hole 41, and the third proportional hole group 73 is not aligned with the fourth input hole 15, the liquid output can be stopped. In this case, the locking head 28 is misaligned with the cutting groove of the flow valve core 7, the long bolt 22 and the limiting nut 23 are twisted, and the hexagonal end of the long bolt 22 can touch the operating valve stem 9, so that the proportional composite valve can keep the cut-off state. When the first proportional hole group 71 is not aligned with the first input hole 12, the second proportional hole group 72 is not aligned with the second input hole 13, the flow guide groove 74 is not aligned with the adjacent port of the third input hole 14 and the three way hole 41, and the third proportional hole group 73 is aligned with the fourth input hole 15, the liquid in the fourth input hole 15 will enter the flow valve core 7 from the third proportional hole group 73, and the position of the flow valve core 7 can be adjusted to change the cross section area of the proportional hole group, so that the liquid can adjust the output pressure. In this case, the long bolt 22 and the limiting nut 23 are twisted, the hexagonal end of the long bolt 22 can touch the operating valve stem 9, so that the proportional composite valve can keep the single liquid output state.

Claims

1. A precision manual proportional combination valve comprising a valve body (1), a valve body end cap (2), a valve base (3), a valve side cap (4), a side cap base (5), a relief valve (6), a flow directing spool (7), a transmission assembly (8) and an operating valve stem (9), characterized in that, One side end face of the valve body (1) is screwed with a valve body end cover (2), the other side end face of the valve body (1) is screwed with a valve base (3), one side of the valve body (1) is screwed with a valve side cover (4), one side end face of the valve side cover (4) is screwed with a side cover base (5), the other side of the valve side cover (4) is embedded with an overflow valve (6), wherein the two side end walls of the valve body (1) are connected with a main hole (11) which is communicated with the valve body end cover (2) and the valve base (3), the main hole (11) is sequentially provided with a first input hole (12), a second input hole (13), a third input hole (14) and a fourth input hole (15) along the axial direction thereof, the valve base (3) is provided with an output hole (31) therein, the valve side cover (4) is provided with a three-way hole (41) therein, two end ports of the three-way hole (41) are communicated with the first input hole (12) and the third input hole (14) respectively, the other port of the three-way hole (41) is embedded with the overflow valve (6), the main hole (11) is slidably embedded with a flow guide valve core (7) matched with the hole, and the valve body end cover (2) is provided with a transmission assembly (8) mounted therein, one end of the transmission assembly (8) penetrates through the valve body end cover (2) and is connected with an operating valve rod (9), and one end of the transmission assembly (8) is connected with the flow guide valve core (7).

2. A precision manual proportional composite valve according to claim 1, characterized in that: The flow guide valve core (7) is of a hollow structure and is provided with an open side facing the valve base (3), the flow guide valve core (7) is sequentially provided with a first proportional hole group (71), a second proportional hole group (72) and a third proportional hole group (73) along the axial direction thereof, the first proportional hole group (71) can correspond to one of the first input hole (12) and the three-way hole (41), the second proportional hole group (72) can correspond to the second input hole (13), and the third proportional hole group (73) can correspond to the fourth input hole (15), and the flow guide valve core (7) is provided with a flow guide groove (74) on the outside thereof and at a position corresponding to the third input hole (14) and the other port of the three-way hole (41).

3. The precision manual proportional composite valve of claim 1, wherein: The three-way hole (41) is embedded with the side cover base (5) on the side wall of the intersection position thereof, the side cover base (5) is fixed with a valve cylinder (51) on one side thereof, the valve cylinder (51) is slidably embedded with a valve head (52) therein, the valve head (52) and the inner end wall of the valve cylinder (51) are fixedly connected with a first spring (53) therebetween, and the valve cylinder (51) is opposite to the port passage of the three-way hole (41) and the third input hole (14).

4. The precision manual proportional composite valve of claim 1, wherein: The openings of the first input hole (12) and the third input hole (14) and the openings of the second input hole (13) and the fourth input hole (15) are located on different side faces of the valve body (1).

5. The precision manual proportional composite valve of claim 1, wherein: The transmission assembly (8) comprises a rack (81) fixed in the valve body end cover (2) and screwed with the flow guide valve core (7), one side of the rack (81) is engaged with a gear (82), the middle part of the gear (82) is fixedly sleeved with a transmission shaft (83), both ends of the transmission shaft (83) are rotatably connected with the valve body end cover (2), and one end of the transmission shaft (83) penetrates through the valve body end cover (2) and is fixed with an operating valve rod (9).

6. A precision manual proportional composite valve as claimed in claim 1, wherein: One side of the valve body end cover (2) is fixedly connected with a protrusion (21), the protrusion (21) is threadedly connected with a long bolt (22), the hexagonal end of the long bolt (22) can abut against the operating valve rod (9), and the outer side of the long bolt (22) is threadedly connected with a limiting nut (23).

7. The precision manual proportional composite valve of claim 1, wherein: The end surface of the valve body end cover (2) is provided with a center rod (24), the outer side of the center rod (24) is sleeved with a yoke (25), the yoke (25) is provided with the operating valve rod (9) at the bifurcated position, and the end of the yoke (25) away from the operating valve rod (9) corresponds to the scale mark on the end surface of the valve body end cover (2).

8. The precision manual proportional composite valve of claim 1, wherein: The side surface of the valve body end cover (2) is fixedly embedded with a screw cylinder (26), one end of the screw cylinder (26) is threadedly connected with a hollow bolt (27), the other end of the screw cylinder (26) is slidingly embedded with a locking head (28), the second spring (29) is arranged between the locking head (28) and the screw cylinder (26), and the side of the flow guide valve core (7) in the valve body end cover (2) is provided with a cut groove corresponding to the locking head (28).

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