An adjustable high-pressure relief valve

Abstract

The present invention discloses an adjustable high-pressure relief valve, which specifically relates to the technical field of relief valves. The valve valve comprises a valve housing, a guide channel is arranged on the side of the valve housing, a valve seat is arranged on the side of the guide channel, a valve core is movably connected to the valve seat, and the valve core is connected to the valve housing through an adjusting member. The valve seat comprises an overflow channel and a discharge channel with increasing diameters. The valve core is slidably arranged in the overflow channel. The side of the discharge channel is connected to the overflow port on the valve housing. The valve core is connected to the valve housing through an adjusting member. The external pressure exerted on the valve core can be adjusted by the adjusting member. When the pressure in the guide channel of the relief valve changes, the output water pressure can be adjusted by changing the relief valve to keep the output water pressure constant.

Description

Technical Field

[0001] The present invention relates to the field of overflow valves, in particular to an adjustable high-pressure overflow valve. Background Art

[0002] The high-pressure relief valve is used in the throttling regulation system of the metering pump. The metering pump provides a constant flow. When the system pressure increases, the flow demand will decrease. At this time, the relief valve opens to allow the excess flow to overflow back to the source to ensure the inlet pressure of the relief valve. In the central water outlet system, in order to make the water jet outlet pressure constant, it is necessary to connect the relief valve between the water jet and the pump.

[0003] For example, patent application CN107150256B discloses a switching system for tool internal cooling and spindle cooling cycles for a five-axis machine tool. The system features a shared pump unit connecting the water tank to the main working passage and a relief valve. Overflow protection is provided through the relief valve, and differential pressure detection components are symmetrically located on the main working passage and relief valve lines. A set of solenoid valves is located at the outlet of the main working passage to switch water flow through either the tool internal cooling or spindle cooling circulation lines. Each line of the tool internal cooling and spindle cooling circulation is again controlled by a solenoid valve unit located in its own line. The solenoid valve units are program-controlled to automatically switch between the tool internal cooling and spindle cooling cycles. A PLC program for water cooling control is programmed to enable tool internal cooling when both the internal cooling pump and the solenoid switching valve are activated simultaneously, while internal cooling of the spindle head is achieved when only the internal cooling pump motor is activated. Advantages: Replacing two pumps with a single pump unit reduces control piping and valve units, resulting in more stable operation, fewer failure points, and lower manufacturing and maintenance costs.

[0004] Patent number CN111577939B discloses a pressure-regulating, check-unloading combined overflow valve, comprising a valve body with an inlet and outlet joints, an overflow joint, and an unloading joint. The valve body is machined with a stepped flow channel, comprising a large-diameter end and a small-diameter end. The large-diameter end is provided with a pressure-regulating mechanism for adjusting the outlet pressure at the outlet joint. The outlet joint is provided with a one-way valve at the inlet end. A reamer is machined at the inlet end of the outlet joint for installing the one-way valve. At least one drain port is machined on the sidewall of the outlet joint at the reamer. An unloading flow channel is machined within the valve body outside the reamer and communicates with the unloading joint. The valve body is provided with an unloading mechanism at the unloading joint. By machining the stepped flow channel within the valve body and connecting the inlet joint, outlet joint, unloading joint, pressure-regulating mechanism, and unloading mechanism to the stepped flow channel, the overflow valve is provided with pressure-regulating, check-unloading, and unloading functions to adapt to the complex environment of high-pressure experiments.

[0005] However, the existing overflow valve does not have an adjustment function, that is, the overflow port opens only after the pressure reaches a certain value, and cannot meet the required output pressure changes. Summary of the Invention

[0006] The object of the present invention is to provide an adjustable high-pressure relief valve to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] An adjustable high-pressure relief valve includes a valve housing, a guide channel is provided on the side of the valve housing, a valve seat is provided on the side of the guide channel, a valve core is movably connected to the valve seat, and the valve core is connected to the valve housing through an adjusting member. The valve seat includes an overflow channel and a discharge channel with increasing diameters. The valve core is slidably arranged in the overflow channel. The side of the discharge channel is connected to the overflow port on the valve housing. The valve core is connected to the valve housing through an adjusting member. The external pressure exerted on the valve core can be adjusted by the adjusting member. When the pressure in the guide channel of the overflow valve changes, the output water pressure can be adjusted by changing the overflow valve to keep the output water pressure constant.

[0009] Preferably, the regulating member includes a sliding plug fixedly connected to the valve core, the sliding plug slides in the slide cylinder, the slide cylinder is axially movably connected to the slideway, the end of the slide cylinder is connected to a pressure gauge, and the pressure gauge is communicated with the interior of the slide cylinder. The regulating member is configured in such a way that the sliding plug slides in the closed slide cylinder, and one end of the valve core is pressurized by compressed air, without the need for elastic parts, thereby preventing the overflow valve from failing due to fatigue of the elastic parts.

[0010] Preferably, an external thread is provided on the outside of the slide, which cooperates with the internal thread on the inside of the slide, a turntable is fixedly connected to the outside of the slide, a locking piece is connected between the slide and the valve core, and the slide is threadedly connected to the valve housing. By rotating the slide, the position of the slide plug connected to the valve core in the slide can be controlled, thereby changing the pressure at the outer end of the valve core.

[0011] Preferably, the locking member includes a locking rod, which is axially sliding and radially fixedly connected to the slide, and is connected to the motor output shaft fixed at the end of the valve housing. The motor, pressure gauge and controller are electrically connected. The locking member is configured in a manner such that the locking rod is plugged into the slide, and the slide is rotated and the feed amount is controlled by the motor. After the controller receives the pressure gauge signal, the motor is adjusted according to the pressure control, and the overflow valve can be dynamically adjusted. When the pump pressure is unstable, the output pressure can be kept relatively stable.

[0012] Preferably, the slide is radially fixed and inserted in the slideway, and a threaded sleeve is provided at the end of the slideway, which is threadedly connected to the threaded rod. The threaded rod is coaxially fixed on the output shaft of the motor, and the motor, pressure gauge and controller are electrically connected. The rotation of the threaded rod is controlled by the motor, and the rotation of the threaded rod drives the slideway to slide in the slideway to achieve a position change between the slideway and the slide plate, thereby changing the pressure on the outer end of the valve core.

[0013] Preferably, both ends of the discharge channel in the valve seat are in contact with the valve housing, and a gasket is provided between the valve seat and the valve housing. The valve core includes a sliding column sliding in the overflow channel, and the sliding column is fixed to the plunger in the overflow channel through a connecting rod. Through holes are respectively provided on the sides of the discharge channel and the overflow channel. A gasket is connected between the valve seat and the valve housing to ensure the sealing between the valve seat and the valve housing.

[0014] Preferably, the plunger is in a truncated cone shape, a gasket is connected to the side of the plunger, the plunger is set to a cylindrical shape and the gasket is connected to ensure the sealing between the valve core and the valve seat.

[0015] Preferably, the adjusting member includes a valve cover, which is threadedly connected to the end of the valve housing. The valve cover is cylindrical, one end of the valve cover is connected to the discharge channel, the valve core is fixedly connected to the spring seat, the spring seat is in conflict with the compression spring, and the other end of the compression spring is in conflict with the spring seat fixed on the adjusting screw. The adjusting screw is threadedly connected to the other end of the valve cover, and the outer end of the adjusting screw is fixedly connected to the threaded sleeve. The adjusting member is provided with an adjusting screw connected to the compression spring, which is suitable for manual adjustment and is suitable for non-corrosive, normal temperature liquid delivery pipelines.

[0016] Preferably, connecting holes are provided at both ends of the guide channel, and the ends of the valve housing are connected to flange plugs. The connecting holes at the ends of the guide channel are used to connect to system pipelines, and the flange plugs at the ends of the valve housing are used for sewage discharge.

[0017] Preferably, the tail end of the overflow channel is connected to an extension tube extending into the discharge channel tube, and the extension tube is in contact with the valve core. When the extension tube is in contact with the valve core, the annular structure is in closer contact with the valve core.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The valve core is connected to the regulating member. By adjusting the regulating member, the pressure on the outer end of the valve core is changed. When the pressure of the fluid in the diversion channel on the valve core is greater than the pressure, the valve core moves to discharge the fluid in the diversion channel from the overflow port.

[0020] 2. The regulating part uses a sliding plug that is connected to the valve core in a sliding manner in a sliding cylinder and is fixed to the valve core. By adjusting the position of the sliding plug in the sliding cylinder, the force on the end of the valve core is changed, thereby adjusting the relief pressure of the relief valve.

[0021] 3. The slide is arranged in the slideway. The motor connected to the controller controls the slide position according to the feedback data of the pressure gauge. The slide position can be dynamically adjusted according to the pressure between the slide and the slide plug. When the external environment changes, the pressure is kept in dynamic balance, thereby keeping the output pressure stable.

[0022] 4. The adjusting piece is a way of connecting the adjusting screw to the compression spring, which has strong resistance to external environmental interference. By changing the position of the adjusting screw, the force on the end of the valve core can be changed;

[0023] 5. The overflow channel end of the valve seat is connected to the extension tube and cooperates with the truncated cone-shaped plunger. When the plunger and the extension tube conflict with each other, the gasket on the plunger is located between the extension tube and the plunger, so that the valve core closes the overflow channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the structure of Example 1 and Example 2 of the present invention;

[0025] Figure 2 sectional views of the valve housings in Examples 1 and 2 of the present invention;

[0026] Figure 3 2 is a cross-sectional view of the valve seat and the slide cylinder in Example 2 of the present invention;

[0027] Figure 4 This is a schematic structural diagram of the valve core in Example 2 of the present invention;

[0028] Figure 5 2 is a cross-sectional view of a slide in Example 3 of the present invention;

[0029] Figure 6 This is a schematic structural diagram of Example 4 of the present invention;

[0030] Figure 7 is a cross-sectional view of Example 4 of the present invention;

[0031] In the figure: 1. valve housing; 11. guide channel; 12. connecting hole; 13. overflow port; 14. internal thread; 2. adjusting member; 21. slide cylinder; 211. external thread; 212. sleeve; 213. limit slider; 214. threaded sleeve; 215. adjusting screw; 216. sleeve; 217. spring seat; 218. compression spring; 22. slide plug; 3. motor; 31. plug-in rod; 32. threaded rod; 4. pressure gauge; 5. valve seat; 51. overflow channel; 52. discharge channel; 53. extension cylinder; 6. gasket; 7. valve core; 71. slide column; 72. connecting rod; 73. plunger; 731. gasket; 8. port flange plug; 81. overflow flange plug. DETAILED DESCRIPTION

[0032] Example 1

[0033] like Figure 1-2As shown, an adjustable high-pressure relief valve includes a valve housing 1, a guide channel 11 is provided on the side of the valve housing 1, a valve seat 5 is provided on the side of the guide channel 11, a valve core 7 is movably connected to the valve seat 5, and the valve core 7 is connected to the valve housing 1 through an adjusting member 2. The valve seat 5 includes an overflow channel 51 and a discharge channel 52 with increasing diameters. The valve core 7 is slidably provided in the overflow channel 51, and the side of the discharge channel 52 is connected to the overflow port 13 on the valve housing 1. Connecting holes 12 are provided at both ends of the guide channel 11, and flange plugs are connected to the end of the valve housing 1. Connecting holes 12 are provided at both ends of the guide channel 11, and flange plugs are connected to the end of the valve housing 1. The tail end of the overflow channel 51 is connected to an extension cylinder 53 extending into the discharge channel 52, and the extension cylinder 53 conflicts with the valve core 7.

[0034] During assembly, the valve core 7 is inserted into the valve seat 5, and the valve core 7 is inserted into the channel connected to the side of the guide channel 11 in the valve housing 1. The valve seat 5 includes an overflow channel 51 and a guide channel 11 with a diameter larger than the overflow channel 51. Through holes are respectively provided on the sides of the overflow channel 51 and the discharge channel 52. The through holes on the side of the overflow channel 51 are connected to the guide channel 11, and the through holes on the side of the discharge channel 52 are connected to the overflow holes. The valve core 7 is provided between the through holes on the side of the overflow channel 51 and the through holes on the side of the guide channel 11 for controlling the on and off of the channel. The valve core 7 is connected to the regulating member 2 connected in the valve housing 1. Connecting holes 12 are provided around the guide channel 11 to connect the guide channel 11 with the delivery pipeline. The connecting holes 12 are used to connect flange bolts.

[0035] During use, the initial pressure applied to the valve core 7 is adjusted by the regulating member 2, that is, the pressure on the right end of the valve core 7 is the pressure applied to it by the regulating member 2, and the valve core 7 is in contact with the right end of the overflow channel 51, so that the overflow channel 51 and the discharge channel 52 remain closed. When the fluid pressure in the guide channel 11 is less than the pressure on the right end of the valve core 7, the valve core 7 is always in contact with the right end of the overflow channel 51, so that the outlet pressure of the guide channel 11 is the same as the water inlet pressure, ensuring the water outlet pressure of the tool; when the fluid pressure in the guide channel 11 is greater than the pressure applied by the regulating member 2 on the right end of the valve core 7, the valve core 7 moves to the right under the action of the pressure difference, so that the overflow channel 51 is connected to the discharge channel 52. The fluid in the guide channel 11 enters the overflow channel 51 through the guide channel 11 and is discharged from the overflow port 13 through the discharge channel 52. That is, a part of the fluid entering the guide channel 11 is lost, and the lost part is discharged back to the water tank through the overflow port 13. Therefore, the water pressure at the outlet of the guide channel 11 is reduced. When the pump is working at rated power, the water jet pressure is guaranteed to be stable. The regulating part 2 is a pressure-adjustable structure. Therefore, the force on the right end of the valve core 7 can be adjusted according to the pressure requirement of the water jet, thereby ensuring the water outlet pressure under different fluid pressure conditions. The right end of the overflow channel 51 is connected to the extension tube 53 and conflicts with the valve core 7 to prevent the valve core 7 from being unable to close due to particle deposition between the valve core 7 and the discharge channel 52.

[0036] Example 2

[0037] like Figure 1-4 As shown, an adjustable high-pressure relief valve includes a valve housing 1, a guide channel 11 is provided on the side of the valve housing 1, a valve seat 5 is provided on the side of the guide channel 11, a valve core 7 is movably connected to the valve seat 5, and the valve core 7 is connected to the valve housing 1 through an adjusting member 2. The valve seat 5 includes an overflow channel 51 and a discharge channel 52 with increasing diameters. The valve core 7 is slidably provided in the overflow channel 51, and the side of the discharge channel 52 is connected to the overflow port 13 on the valve housing 1; the adjusting member 2 includes a sliding plug 22 fixedly connected to the valve core 7, the sliding plug 22 slides in the slide cylinder 21, and the slide cylinder 21 is axially movably connected to the discharge channel 52. The end of the slide cylinder 21 is connected to a pressure gauge 4, and the pressure gauge 4 is connected to the inside of the slide cylinder 21; the outer side of the slide cylinder 21 is provided There is an external thread 211, which cooperates with the internal thread 14 on the inner side of the slide. A turntable is fixedly connected to the outside of the slide 21, and a locking piece is connected between the slide 21 and the valve core 7; the locking piece includes a locking rod, which slides axially and is fixedly connected to the slide 21 in the radial direction. The locking rod is connected to the output shaft of the motor 3 fixed at the end of the valve housing 1, and the motor 3 and the pressure gauge 4 are electrically connected to the controller; both ends of the discharge channel 52 in the valve seat 5 are in conflict with the valve housing 1, and a gasket 6 is arranged between the valve seat 5 and the valve housing 1, and the valve core 7 includes a sliding column 71 sliding in the overflow channel 51, and the sliding column 71 is fixed to the plunger 73 in the overflow channel 51 through a connecting rod, and through holes are respectively arranged on the sides of the discharge channel 52 and the overflow channel 51.

[0038] When unclamping the piston 74, the piston rod 72 is in the state of being lifted up, and the piston rod 73 is in the state of being lifted up, so that the piston rod 73 is in the state of being lifted up.

[0039] When the pressure of the valve core 7 is adjusted, the slide cylinder 21 is rotated to rotate the slide cylinder 21 relative to the valve core 7. Since the slide cylinder 21 is threadedly connected to the valve housing 1, the slide cylinder 21 can move axially relative to the valve housing 1, and the slide cylinder 21 moves axially relative to the slide plug 22 connected to the valve core 7, so that the distance between the slide plug 22 and the slide cylinder 21 is compressed, thereby increasing the pressure on the right end of the valve core 7, thereby changing the water outlet pressure of the tool. Conversely, the slide cylinder 21 slides toward the outside of the valve housing 1 relative to the valve housing 1, and the pressure on the valve core 7 is reduced. The slide cylinder 21 is connected to the plug rod through the plug sleeve 212, and the plug rod is connected to the motor 3. A pressure gauge 4 is connected to the side of the slide cylinder 21 to monitor the internal pressure of the slide cylinder 21 in real time. When the temperature changes, the internal pressure of the slide cylinder 21 increases due to gas expansion. The detection data of the pressure gauge 4 is fed back to the controller, and the controller controls the motor 3 to rotate to rotate the slide cylinder 21 relative to the valve housing 1, thereby changing the pressure on the valve core 7. The internal pressure of the slide cylinder 21 can be adjusted in real time according to the pressure change during the operation of the relief valve, so that the water outlet pressure of the tool is stable.

[0040] Example 3

[0041] like Figure 1-2 As shown in Figure 5, an adjustable high-pressure relief valve includes a valve housing 1, a guide channel 11 is provided on the side of the valve housing 1, a valve seat 5 is provided on the side of the guide channel 11, a valve core 7 is movably connected to the valve seat 5, and the valve core 7 is connected to the valve housing 1 through an adjusting member 2. The valve seat 5 includes an overflow channel 51 and a discharge channel 52 with increasing diameters. The valve core 7 is slidably provided in the overflow channel 51, and the side of the discharge channel 52 is connected to the overflow port 13 on the valve housing 1. The adjusting member 2 includes a sliding plug 22 fixedly connected to the valve core 7, and the sliding plug 22 slides in the slide cylinder 21. The slide 21 is axially movably connected in the discharge channel 52, the end of the slide 21 is connected to the pressure gauge 4, the pressure gauge 4 is communicated with the inside of the slide 21, the two ends of the discharge channel 52 in the valve seat 5 are in conflict with the valve housing 1, and a gasket 6 is provided between the valve seat 5 and the valve housing 1. The valve core 7 includes a slide 71 sliding in the overflow channel 51, and the slide 71 is fixed to the plunger 73 in the overflow channel 51 through a connecting rod. Through holes are respectively provided on the sides of the discharge channel 52 and the overflow channel 51. The plunger 73 is frustum-shaped, and a gasket 731 is connected to the side of the plunger 73.

[0042] The end of the slide 21 is connected to a threaded sleeve 214, and the threaded sleeve 214 is fixed coaxially with the output shaft of the motor 3. The side of the slide 21 is connected to a limit slider 213, and the limit slider 213 slides along the axial direction of the slide 21 in the limit slide groove in the slide. When the motor 3 rotates, the threaded rod 32 rotates and drives the slide 21 to slide in the slide, thereby changing the space between the slide plug 22 and the slide 21, and then changing the pressure applied by the right end of the valve core 7. Gaskets 6 are provided at both ends of the valve seat 5 to ensure the sealing between the end of the valve seat 5 and the valve core 7. A gasket 731 is connected to the left end of the plunger 73, and the inner ring of the gasket 731 is fixed to the plunger, and a certain gap is left between the outer ring and the plunger 73. Under pressure, the gasket 731 fits into the right end of the overflow channel 51 to ensure the sealing between the valve core 7 and the valve seat 5.

[0043] Example 4

[0044] like Figure 6-7 As shown, an adjustable high-pressure relief valve includes a valve housing 1, a guide channel 11 is provided on the side of the valve housing 1, a valve seat 5 is provided on the side of the guide channel 11, a valve core 7 is movably connected to the valve seat 5, and the valve core 7 is connected to the valve housing 1 through an adjusting member 2. The valve seat 5 includes an overflow channel 51 and a discharge channel 52 with increasing diameters. The valve core 7 is slidably provided in the overflow channel 51, and the side of the discharge channel 52 is connected to the overflow port 13 on the valve housing 1. The adjusting member 2 includes a valve cover, which is threadedly connected to the end of the valve housing 1 The valve cover is cylindrical, one end of the valve cover is connected to the discharge channel 52, the valve core 7 is fixedly connected to the spring seat 217, the compression spring 218 seat 217 conflicts with the spring, the other end of the compression spring 218 conflicts with the spring seat 217 fixed on the adjusting screw 215, the adjusting screw 215 is threadedly connected to the other end of the valve cover, the outer end of the adjusting screw 215 is fixedly connected to the screw sleeve 216, the overflow port 13 is connected to the overflow flange plug 81, and the left end of the valve housing 1 is connected to the port flange plug 8, when not connected.

[0045] The slide 21 is threadedly connected to the valve housing 1 until the slide 21 and the valve housing 1 remain relatively fixed. The right end of the slide 21 is threadedly connected to the adjusting screw 215, and the adjusting screw 215 is fixedly connected to the screw sleeve 216. By rotating the screw sleeve 216, the adjusting screw 215 is moved axially relative to the slide 21, so that the spring seat 217 connected to the adjusting screw 215 applies pressure to the compression spring 218 or releases the potential energy of the compression spring 218, thereby increasing or decreasing the pressure on the spring seat 217 connected to the valve core 7 at the left end of the compression spring 218, thereby changing the force on the valve core 7. When not in use, the overflow flange plug 81 is connected to the overflow port 13 to close the overflow valve. After the port flange bolts are opened, the inside of the overflow valve can be drained and cleaned.

Claims

1. An adjustable high-pressure relief valve, characterized in that: The valve housing (1) comprises a valve core (7), a guide channel (11) being provided on the side of the valve housing (1), a valve seat (5) being provided on the side of the guide channel (11), a valve core (7) being movably connected in the valve seat (5), the valve core (7) being connected to the valve housing (1) via an adjusting member (2), the valve seat (5) comprising an overflow channel (51) and a discharge channel (52) with increasing diameters, the valve core (7) being slidably provided in the overflow channel (51), and the side of the discharge channel (52) being communicated with an overflow port (13) on the valve housing (1); The regulating member (2) includes a sliding plug (22) fixedly connected to the valve core (7), the sliding plug (22) slides in the slide cylinder (21), the slide cylinder (21) is axially movably connected to the discharge channel (52), the end of the slide cylinder (21) is connected to the pressure gauge (4), and the pressure gauge (4) is communicated with the interior of the slide cylinder (21); The outer side of the slide (21) is provided with an external thread (211), which cooperates with the internal thread (14) on the inner side of the slideway in the valve housing (1). The end of the slide (21) is connected to the plug sleeve (212), and the plug sleeve (212) is radially fixed and axially plugged with the plug rod. The plug rod is also coaxially fixed with the output shaft of the motor (3) fixed at the end of the valve housing (1). The motor (3), the pressure gauge (4) and the controller are electrically connected.

2. An adjustable high-pressure relief valve, characterized in that: The valve housing (1) comprises a valve core (7), a guide channel (11) being provided on the side of the valve housing (1), a valve seat (5) being provided on the side of the guide channel (11), a valve core (7) being movably connected in the valve seat (5), the valve core (7) being connected to the valve housing (1) via an adjusting member (2), the valve seat (5) comprising an overflow channel (51) and a discharge channel (52) with increasing diameters, the valve core (7) being slidably provided in the overflow channel (51), and the side of the discharge channel (52) being communicated with an overflow port (13) on the valve housing (1); The regulating member (2) includes a sliding plug (22) fixedly connected to the valve core (7), the sliding plug (22) slides in the slide cylinder (21), the slide cylinder (21) is axially movably connected to the discharge channel (52), the end of the slide cylinder (21) is connected to the pressure gauge (4), and the pressure gauge (4) is communicated with the interior of the slide cylinder (21); The slide cylinder (21) is radially fixed and inserted into the slideway in the valve housing (1). A threaded sleeve (214) is provided at the end of the slide cylinder (21). The threaded sleeve (214) is threadedly connected to the threaded rod (32). The threaded rod (32) is coaxially fixed to the output shaft of the motor (3). The motor (3), the pressure gauge (4) and the controller are electrically connected.

3. An adjustable high-pressure relief valve according to claim 1 or 2, characterized in that: The two ends of the discharge channel (52) in the valve seat (5) are in contact with the valve housing (1), and a gasket (6) is provided between the valve seat (5) and the valve housing (1). The valve core (7) includes a slide column (71) sliding in the overflow channel (51), and the slide column (71) is fixed to the plunger (73) in the discharge channel (52) through a connecting rod. Through holes are respectively provided on the sides of the discharge channel (52) and the overflow channel (51).

4. The adjustable high-pressure relief valve according to claim 3, characterized in that: The plunger (73) is in the shape of a truncated cone, and a gasket (731) is connected to the side of the plunger (73).

5. An adjustable high-pressure relief valve according to claim 1 or 2, characterized in that: Connecting holes (12) are provided at both ends of the flow guide channel (11), and the ends of the valve housing (1) are connected to flange screw plugs.

6. An adjustable high-pressure relief valve according to claim 1 or 2, characterized in that: The tail end of the overflow channel (51) is connected to an extension tube (53) extending into the discharge channel (52), and the extension tube (53) is in conflict with the valve core (7).

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