Multifunction front reducing valve

Abstract

The present application provides a kind of multifunctional table front pressure reducing valve, belongs to valve technical field.It solves how to meet the cutoff and pressure reducing function while improving the use safety.The present application includes valve body and the elastic pressure reducing component that can be adjusted outlet water pressure in valve body, elastic pressure reducing component includes pressure reducing core and the pressure reducing spring that acts on pressure reducing core, the rotatable valve stem is arranged in the upper end of valve body, the lock cap is arranged outside the upper end of valve body, the magnetic locking mechanism that can make both circumferential fixed is arranged between lock cap and valve body, the lower end of valve stem is circumferentially fixed with lock cap and is limited in axial direction with valve body, the lower end of valve stem is threadedly connected with pressure sleeve, pressure sleeve is circumferentially fixed with valve body, when valve stem rotates, pressure sleeve can push pressure reducing core to overcome the elastic force of pressure reducing spring and close pressure reducing valve.The present application improves the safety when using, and is more practical and has wider application.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of valves, and relates to a valve, in particular to a multifunctional front pressure reducing valve. BACKGROUND

[0002] The pressure reducing valve is essentially a self-powered differential pressure control device, and its working principle is to reduce the inlet pressure to a required outlet pressure and rely on the energy of the medium itself to automatically maintain the stability of the outlet pressure. The structure of the existing pressure reducing valve is disclosed in a pressure reducing valve with application number 201320697106.2, which comprises a valve body with a water inlet and a water outlet, a valve core seat in the valve body, a valve flap assembly in the valve core seat, a valve cover threadedly connected to the valve body and located above the valve core seat, a pressure regulating assembly between the valve cover and the valve core seat and acting on the valve flap assembly, and a buffer spring at the bottom of the valve flap assembly to make the valve flap assembly have an upward movement tendency. The valve flap assembly and the valve core seat form a water passage that can change the water flow when the valve flap assembly moves up and down.

[0003] When the above-mentioned pressure reducing valve is working, the pressure at the water outlet is sensed by the pressure regulating assembly, and the upward and downward movement of the valve flap assembly is controlled to change the water flow so as to maintain the constant pressure at the water outlet. However, the pressure reducing valve can only adjust the pressure before and after the valve, and the user cannot completely cut off the waterway by operating the pressure reducing valve like a traditional main valve such as a ball valve, a gate valve or a stop valve, so it can only be used as a throttling element in the pipeline, and a main valve must also be additionally provided for cutting off the waterway at any time.

[0004] The combined structure formed by simply connecting the traditional pressure reducing valve and the main valve has the problems of large size and high space occupancy. Therefore, a constant flow valve with application number 201910047495.6 is proposed in Chinese patent, which is based on the pressure reducing function and threadedly connects a control rod to the lower end of the valve body, the control rod is located below the valve rod, the lower end of the control rod extends out of the valve body for user operation, when the user rotates the control rod, the control rod moves up and down relative to the valve body along the thread, and when the control rod moves up, the upper end surface of the control rod abuts against the lower end surface of the valve rod to push the valve rod up to close the lower port of the passage, so that the entire waterway is cut off, which is equivalent to the user closing the constant flow valve like operating a conventional main valve; when the control rod moves down, the upper end surface of the control rod forms a gap with the lower end surface of the valve rod, so that the valve rod moves down under the action of the spring to open the lower port of the passage, so that the entire waterway is opened, and after opening, it can work like an ordinary pressure reducing valve.

[0005] The constant flow valve has the functions of pressure reduction and cut-off, and has small size and low space occupancy. However, the lower end of the control rod extends out of the valve body, which means that anyone can operate the valve at will, resulting in low safety and low applicability for community property management or water supply companies. SUMMARY

[0006] The present application aims to solve the above problems in the prior art, and provides a multifunctional front pressure reducing valve.

[0007] The object of the present application can be achieved by the following technical solutions:

[0008] The multifunctional front pressure reducing valve comprises a valve body and an elastic pressure reducing assembly arranged in the valve body and capable of adjusting water outlet pressure, the elastic pressure reducing assembly comprises a pressure reducing core and a pressure reducing spring acting on the pressure reducing core, a rotatable valve rod is arranged in the upper end of the valve body, a lock cap is arranged outside the upper end of the valve body, a magnetic locking mechanism is arranged between the lock cap and the valve body to circumferentially fix the two, the valve rod is limited in the axial direction of the valve body and circumferentially fixed with the lock cap at the upper end, a pressure sleeve is threadedly connected to the lower end of the valve rod, and the pressure sleeve is circumferentially fixed with the valve body, the pressure sleeve can push the pressure reducing core to close the pressure reducing valve against the elastic force of the pressure reducing spring when the valve rod is rotated.

[0009] During normal use, the water outlet amount in the valve body is controlled by the up-and-down movement of the elastic pressure reducing assembly, so that the pressure at the water outlet end is kept stable. In this process, the valve body and the lock cap are circumferentially fixed by the magnetic locking mechanism, so that others cannot rotate the valve rod without special tools, making the pressure reducing process more secure and reliable. When the valve needs to be closed, the magnetic locking mechanism is unlocked with a special tool, so that the lock cap can rotate relative to the valve body, and the valve rod rotates synchronously with the lock cap. Since the pressure sleeve is threadedly connected to the lower end of the valve rod and circumferentially fixed with the valve body, the pressure sleeve will move downward along the thread, and the pressure sleeve will push the pressure reducing core to move against the elastic force of the pressure reducing spring to close the pressure reducing valve, so that the pressure reducing valve has the function of cut-off. After the water outlet is cut off, the special tool is removed, and the lock cap and the valve body are again circumferentially fixed by the magnetic locking mechanism to prevent the valve rod from rotating, making the cut-off function more secure and reliable.

[0010] The multifunctional front pressure reducing valve realizes the integration of pressure reduction, cut-off and locking functions by the cooperation of the lock cap and the valve rod, the pressure sleeve and the valve rod, and the pressure sleeve and the valve body, so that the multifunctional front pressure reducing valve can simultaneously function as a pressure reducing valve and a traditional main valve, and the safety during use is improved, the application range is wider, and the valve is more practical.

[0011] In the multifunctional front pressure reducing valve, the pressure sleeve is provided with a guide hole, the pressure sleeve is in a cylindrical shape, the outer circumferential surface of the upper end of the pressure sleeve is provided with an annular matching part, the annular matching part is fixed to the valve body in a circumferential direction, and the lower end of the pressure sleeve is located in the port of the guide hole.

[0012] When the pressure is reduced, the lower end of the pressure sleeve is located in the port of the guide hole, so that there is a certain distance between the lower end surface of the pressure sleeve and the bottom wall of the guide hole, which can ensure the normal moving range of the elastic pressure reducing assembly during pressure reduction; when the valve rod is rotated to close the pressure reducing valve, the guide hole plays a guiding role of the pressure sleeve, which can ensure that the pressure sleeve can accurately push the pressure reducing core to move to cut off the water outlet of the pressure reducing valve.

[0013] In the multifunctional front pressure reducing valve, the valve body is provided with a matching hole which is a non-circular hole in the upper end, the annular matching part is located in the matching hole, the shape of the annular matching part is the same as that of the matching hole, and the opening depth of the matching hole is greater than the distance from the upper end surface of the pressure sleeve to the bottom wall of the guide hole.

[0014] The opening depth of the matching hole is greater than the distance from the upper end surface of the pressure sleeve to the bottom wall of the guide hole, so that when the lower end surface of the pressure sleeve abuts against the bottom wall of the guide hole, the annular matching part is still located in the matching hole, which can avoid the disconnection of the pressure sleeve and the valve body, ensure the normal upward movement of the pressure sleeve, and ensure the effectiveness and reliability of the pressure reducing function.

[0015] In the multifunctional front pressure reducing valve, the left and right ends of the valve body are respectively a water inlet end and a water outlet end, the valve body is provided with a water passing cavity, the water passing cavity is provided with a water inlet channel which is connected to the water inlet end in a vertical direction, the pressure reducing core includes a core rod which passes through the water inlet channel, a baffle which is fixed to the lower end of the core rod, and a water blocking head which is fixed to the upper end of the core rod, the guide hole is arranged at the upper end of the water blocking head, the lower end surface of the water blocking head is embedded with a sealing gasket, and the elastic pressure reducing assembly further includes a buffer spring which exerts a downward elastic force on the pressure reducing core, and the elastic force of the pressure reducing spring is greater than that of the buffer spring.

[0016] In the initial stage, the upper port of the water inlet channel is opened, the water flows into the water passing cavity through the water inlet end and the water inlet channel in sequence, and finally flows out from the water outlet end. When the pressure of the water outlet end is too large, the sum of the pressure of the water acting on the baffle and the elastic force of the buffer spring is greater than the elastic force of the pressure reducing spring, the water blocking head moves downward to reduce the flux of the water flowing out from the water inlet channel, and the pressure of the water outlet end decreases. When the pressure of the water outlet end is small, the elastic force of the pressure reducing spring is greater than the sum of the pressure of the water acting on the baffle and the elastic force of the buffer spring, so that the water blocking head moves upward, the flux of the water flowing out from the water inlet channel increases again, and the pressure of the water outlet end increases. In the whole water outlet process, the above steps are repeated to keep the pressure of the water outlet end stable. When the valve rod is rotated to move the pressure sleeve downward, the pressure sleeve pushes the water blocking head to overcome the elastic force of the pressure reducing spring, so that the sealing gasket abuts against the surface where the upper port of the water inlet channel is located, the water outlet of the water inlet channel is cut off, and the cut-off is realized.

[0017] In the multifunctional front pressure reducing valve, the valve body comprises a body and a valve cap threadedly connected to the upper end of the body, a valve rod is arranged in the valve cap, the lower end surface of the valve cap is provided with a concave cavity, the top wall of the concave cavity is provided with an annular flange, a matching hole is arranged on the inner side of the annular flange, the water blocking head comprises a base and a positioning column protruding from the center of the upper end surface of the base, a guide hole is arranged on the positioning column, and the upper and lower ends of the buffer spring are sleeved on the annular flange and the positioning column respectively.

[0018] The positioning column not only plays a positioning role of the buffer spring, but also cooperates with the pressing sleeve, so that the structure is more simple. The annular flange is arranged to make the buffer spring and the pressing sleeve independent of each other and not interfere with each other, thereby ensuring the effectiveness of the pressure reducing function and the cut-off function.

[0019] In the multifunctional front pressure reducing valve, the valve body further comprises a valve cover threadedly connected to the lower end of the body, the lower end of the valve cover is open, and the valve cover is threadedly connected with an adjusting head inside. The upper end of the pressure reducing spring abuts against the lower end surface of the baffle, the lower end of the pressure reducing spring abuts against the upper end surface of the adjusting head, and the multifunctional front pressure reducing valve further comprises a key capable of being sleeved on the lock cap and unlocking the magnetic locking mechanism. The upper end surface of the lock cap is symmetrically provided with two insertion slots, the lower end surface of the adjusting head is symmetrically provided with two connecting grooves, the key is cylindrical, the outer diameter of the key is slightly smaller than the inner diameter of the valve cover, the lower end surface of the key is provided with a matching cavity at the center, and the lower end surface of the key is symmetrically provided with two insertion pins capable of being inserted into the insertion slots or the connecting grooves.

[0020] The key is cylindrical and the outer diameter of the key is slightly smaller than the inner diameter of the valve cover. When the user needs to adjust the set pressure of the pressure reducing spring or manually adjust the outlet pressure, the user can directly insert the key into the valve cover so that the two insertion pins of the key are inserted into the two connecting grooves of the adjusting head. In this way, the user can rotate the adjusting head through the key, so that the adjusting head can move upward or downward along the threads to compress or release the pressure reducing spring, or move the pressure reducing core upward or downward during use. The multifunctional front pressure reducing valve is provided with connecting grooves on the adjusting head, so that the key can be used for unlocking the valve rod and adjusting the elasticity of the pressure reducing spring. The structure is simplified and the user's convenience is improved.

[0021] In the conventional technology, the tool for rotating the adjusting head is separately arranged, such as the pressure reducing valve disclosed in application No. 201320697106.2, the piston type pressure reducing valve disclosed in application No. 201020153923.8, and the adjustable pressure reducing valve disclosed in application No. 200810059912.0. However, the multifunctional front pressure reducing valve uses the key for unlocking the magnetic locking mechanism to rotate the adjusting head, which does not belong to the conventional technical means of the person skilled in the art.

[0022] In the multifunctional front pressure reducing valve, a filtering passage is arranged between the water outlet end and the water passing cavity, the filtering passage is inclined towards the water outlet end, the upper end of the filtering passage is communicated with the water passing cavity, the lower end side of the filtering passage is communicated with the inlet of the water outlet end, a cylindrical filter screen is arranged in the filtering passage, the inner side of the cylindrical filter screen is provided with an elastic check valve assembly, the elastic check valve assembly comprises a check valve core and a check spring, the lower end of the filtering passage is threadedly connected with a plug cover, the two ends of the check spring are respectively abutted against the inner side top wall of the check valve core and the inner side bottom wall of the plug cover, a through hole is arranged in the side of the check valve core, and the communication position of the water outlet end and the filtering passage is opposite to the through hole.

[0023] The cylindrical filter screen and the elastic check valve assembly are arranged, so that the multifunctional front pressure reducing valve is integrated with filtering and check valve functions, is more functional, has higher practical value and is smaller in size.

[0024] Compared with the prior art, the multifunctional front pressure reducing valve has the following advantages:

[0025] 1. The locking cap, the valve rod, the pressing sleeve and the valve body are matched, the integration of the pressure reducing, cutting off and locking functions is realized, the multifunctional front pressure reducing valve can simultaneously play the roles of a pressure reducing valve and a traditional main valve, the safety during use is improved, the application range is wider and the multifunctional front pressure reducing valve is more practical.

[0026] 2. The key is designed to be used for unlocking operation of the valve rod and adjustment operation of the pressure spring elastic force, the structure is simplified and the use convenience of the user is improved.

[0027] 3. The cylindrical filter screen and the elastic check valve assembly are arranged, so that the multifunctional front pressure reducing valve is integrated with filtering and check valve functions, is more functional, has higher practical value and is smaller in size. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a schematic view of the multifunctional front pressure reducing valve in example one.

[0029] Figure 2 is a schematic view of the multifunctional front pressure reducing valve in example one when the end cover is not connected to the lower end.

[0030] Figure 3 is a sectional view of the multifunctional front pressure reducing valve in example one.

[0031] Figure 4 is a sectional view of the valve rod, the valve cap, the pressing sleeve and the elastic pressure reducing assembly in the multifunctional front pressure reducing valve.

[0032] Figure 5 is an exploded view of the valve rod and the valve cap in the multifunctional front pressure reducing valve.

[0033] Figure 6 is a schematic view of the key of the multifunctional front pressure reducing valve.

[0034] Figure 7 is a schematic view of the multifunctional front pressure reducing valve in Example 2.

[0035] Figure 8 is a sectional view of the multifunctional front pressure reducing valve in Example 2.

[0036] In the figure, 1, valve body; 1a, body; 1a1, water inlet end; 1a2, water outlet end; 1a21, flared section; 1a3, water inlet channel; 1a4, filter channel; 1b, valve cap; 1b1, mating hole; 1b2, annular flange; 1c, valve cover; 1d, water passage cavity; 2, elastic pressure reducing assembly; 2a, pressure reducing core; 2a1, core rod; 2a2, baffle; 2a3, water blocking head; 2a31, base; 2a32, positioning column; 2a33, guide hole; 2a4, sealing gasket; 2b, pressure reducing spring; 2c, buffer spring; 3, valve rod; 4, lock cap; 4a, insertion slot; 4b, protrusion; 5, magnetic locking mechanism; 5a, locking spring; 5b, cylindrical pin; 5c, magnetic column; 6, pressure sleeve; 6a, annular mating part; 7, adjustment head; 7a, connection slot; 8, key; 8a, insertion leg; 8b, magnet; 8c, mating cavity; 9, cylindrical filter screen; 10, elastic check assembly; 10a, check core; 10a1, through hole; 10b, check spring; 11, end cover; 12, circlip; 13, ball core; 14, handle. DETAILED DESCRIPTION

[0037] The following are specific embodiments of the present application and further describe the technical solutions of the present application in conjunction with the accompanying drawings, but the present application is not limited to these embodiments.

[0038] Example 1

[0039] As shown in Figures 1-3 , the multifunctional front pressure reducing valve comprises a valve body 1 with a water inlet end 1a1 and a water outlet end 1a2 at the left and right ends respectively, a water passage cavity 1d is arranged in the valve body 1, the water passage cavity 1d is in communication with the water outlet end 1a2, a water inlet channel 1a3 is arranged in the water passage cavity 1d in the vertical direction, the water inlet end 1a1 is in communication with the water inlet channel 1a3, and an elastic pressure reducing assembly 2 is arranged in the water inlet channel 1a3 and can move up and down.

[0040] As shown in Figure 3 and Figure 4As shown, the elastic pressure relief assembly 2 comprises a pressure relief core 2a, a pressure relief spring 2b and a buffer spring 2c. The pressure relief core 2a comprises a core rod 2a1 passing through the water inlet channel 1a3, a baffle 2a2 fixed to the lower end of the core rod 2a1 and a water blocking head 2a3 fixed to the upper end of the core rod 2a1. A sealing gasket 2a4 is sleeved on the upper end of the core rod 2a1 and embedded in the lower end of the water blocking head 2a3. The pressure relief spring 2b exerts an upward force on the baffle 2a1, and the buffer spring 2c exerts a downward force on the water blocking head 2a3 so that the sealing gasket 2a4 closes the upper port of the water inlet channel 1a3. A sealing ring is arranged outside the baffle 2a1, and the outer wall of the sealing ring abuts against the inner wall of the valve body 1. A regulating head 7 is threadedly connected to the lower end of the valve body 1. The upper end of the pressure relief spring 2b abuts against the lower end surface of the baffle 2a1, and the lower end of the pressure relief spring 2b abuts against the upper end surface of the regulating head 7. The elastic force of the pressure relief spring 2b is greater than that of the buffer spring 2c.

[0041] As shown in the drawings, Figures 3-5 The upper end of the valve body 1 is externally provided with a lock cap 4, and a magnetic locking mechanism 5 is arranged between the lock cap 4 and the valve body 1 to fix them circumferentially. A rotatable valve rod 3 is axially arranged in the upper end of the valve body 1. The valve rod 3 is axially fixed to the valve body 1, and the upper end of the valve rod 3 protrudes out of the upper end of the valve body 1 and is circumferentially fixed to the lock cap 4. The lower end of the valve rod 3 is threadedly connected with a pressing sleeve 6, and the pressing sleeve 6 is circumferentially fixed to the valve body 1. When the valve rod 3 is rotated, the pressing sleeve 6 can push the water blocking head 2a3 to move downward.

[0042] As shown in the drawings, Figures 3-5 In this embodiment, the valve body 1 comprises a body 1a, a valve cap 1b threadedly connected to the upper end of the body 1a and a valve cover 1c threadedly connected to the lower end of the body 1a. The lock cap 4 is axially connected to the valve cap 1b, and the magnetic locking mechanism 5 is arranged between the lock cap 4 and the valve cap 1b. The lower end surface of the valve cap 1b is provided with a concave cavity, and the top wall of the concave cavity is provided with an annular flange 1b2. The water blocking head 2a3 comprises a base 2a31 and a positioning column 2a32 protruding from the center of the upper end surface of the base 2a31. The sealing gasket 2a4 is embedded in the lower end of the base 2a31, and the upper and lower ends of the buffer spring 2c are sleeved on the annular flange 1b2 and the positioning column 2a32, respectively.

[0043] As shown in the drawings, Figure 3As shown, the lower end of the cap 4 is centrally provided with a positioning cavity, and the upper end face of the bonnet 1b is centrally provided with a positioning head which extends into the positioning cavity. The outer peripheral surface of the positioning head is provided with an annular clamping groove I, and the inner peripheral surface of the positioning cavity is correspondingly provided with an annular clamping groove II, the annular clamping groove I is internally provided with a clamping spring 12, the clamping spring 12 is partially located in the annular clamping groove II, and the outer diameter of the positioning head at a position above the annular clamping groove I is greater than the inner diameter of the clamping spring 12. The top wall of the positioning cavity is provided with a square hole, and the upper end of the valve stem 3 is square, the upper end of the operating rod extends out of the positioning head and is inserted into the square hole. The upper end face of the bonnet 1b is provided with a mounting hole I, and the lower end face of the cap 4 is correspondingly provided with a mounting hole II, the magnetic locking mechanism 5 includes a locking spring 5a and a cylindrical pin 5b which are both arranged in the mounting hole I, and a magnetic column 5c which is arranged in the mounting hole II, the upper end of the cylindrical pin 5b extends into the mounting hole II under the elastic force of the locking spring 5a and abuts against the lower end face of the magnetic column 5c.

[0044] As shown in Figure 4 and Figure 5 , the top wall of the recessed cavity is centrally provided with a matching hole 1b1 which is a non-circular hole, the pressing sleeve 6 is cylindrical, and the upper end outer peripheral surface of the pressing sleeve 6 is provided with an annular matching portion 6a which is located in the matching hole 1b1, the shape of the annular matching portion 6a is the same as that of the matching hole 1b1, and the matching hole 1b1 is specifically a hexagonal hole. The upper end face of the positioning column 2a32 is provided with a guide hole 2a33, and the lower end of the pressing sleeve 6 is located in the port of the guide hole 2a33, and the depth of the matching hole 1b1 is greater than the distance from the lower end face of the pressing sleeve 6 to the bottom wall of the guide hole 2a33.

[0045] As shown in Figure 1 , Figure 2 , Figure 3 and Figure 6 , the valve cover 1c is open at the lower end, the adjusting head 7 is threadedly connected in the valve cover 1c, and the lower port of the valve cover 1c is threadedly connected with an end cover 11. The multifunctional front pressure reducing valve further includes a key 8 which can be sleeved on the cap 4 and unlocks the magnetic locking mechanism 5, and the lower end face of the key 8 is provided with a magnet 8b which has the same magnetism as the magnetic column 5c. The upper end face of the cap 4 is centrally provided with a protrusion 4b, and the upper end face of the cap 4 is symmetrically provided with two insertion grooves 4a, the lower end face of the adjusting head 7 is symmetrically provided with two connecting grooves 7a, the key 8 is cylindrical, the outer diameter of the key 8 is slightly smaller than the inner diameter of the valve cover 1c, the lower end face of the key 8 is centrally provided with a matching cavity 8c, and the lower end face of the key 8 is symmetrically provided with two prongs 8a which can be inserted into the insertion grooves 4a or the connecting grooves 7a.

[0046] When used as a pressure reducing valve, the magnetic locking mechanism 5 locks the locking cap 4 to the valve body 1, preventing the valve stem 3 from rotating. The pressure sleeve 6 separates from the water baffle head 2a3. The spring force of the pressure reducing spring 2b is greater than that of the buffer spring 2c, causing the water baffle head 2a3 to move upward. The upper port of the water inlet channel 1a3 is opened, and water flows sequentially through the water inlet end 1a1 and the water inlet channel 1a3 into the water passage chamber 1d, and finally flows out from the water outlet end 1a2. When the pressure at the water outlet end 1a2 is too high, the sum of the pressure of the water acting on the baffle 2a1 and the spring force of the buffer spring 2c is greater than the spring force of the pressure reducing spring 2b. The pressure reducing spring 2b is compressed, causing the water baffle head 2a3 to move downward. As a result, the flow rate of water out of the water inlet channel 1a3 is reduced, and the pressure at the water outlet end 1a2 decreases accordingly. When the pressure at the outlet 1a2 is low, the force of the pressure-reducing spring 2b is greater than the sum of the pressure of water acting on the baffle 2a1 and the force of the buffer spring 2c, causing the water-blocking head 2a3 to move upward. This increases the flow rate of water out of the inlet channel 1a3, and consequently increases the pressure at the outlet 1a2. Throughout the entire water discharge process, the above steps are repeated cyclically, ensuring that the pressure at the outlet 1a2 remains stable.

[0047] When the valve needs to be closed, key 8 is placed on the lock cap 4 and the two prongs 8a are inserted into the slots 4a on the lock cap 4. Key 8 unlocks the magnetic locking mechanism 5, allowing the user to rotate the lock cap 4 using key 8. The valve stem 3 rotates together with the lock cap 4, causing the pressure sleeve 6 to push the water baffle head 2a3 downward, thus closing the upper port of the water inlet channel 1a3 and cutting off the entire water circuit, achieving the shut-off function. After removing key 8, the lock cap 4 is once again fixed to the valve body 1 by the magnetic locking mechanism 5, making the valve stem 3 unable to be operated and achieving the locking function, ensuring the safety of the entire multi-function pressure reducing valve during use.

[0048] The key 8 is cylindrical. To adjust the set pressure of the pressure-reducing spring 2b or to manually adjust the pressure at the outlet 1a2, the user can unscrew the end cap 11 and insert the key 8 into the valve cover 1c, so that the two prongs 8a of the key 8 are inserted into the two connecting slots 7a of the adjusting head 7. This allows the user to rotate the adjusting head 7 via the key 8, thus moving the adjusting head 7 up or down along the threads to compress or release the pressure-reducing spring 2b, or to move the pressure-reducing core 2a up or down during use. This multi-functional pre-valve pressure reducing valve, by providing connecting slots 7a on the adjusting head 7, allows the key 8 to be used for both unlocking the valve stem 3 and adjusting the spring force of the pressure-reducing spring 2b, simplifying the structure and improving user convenience.

[0049] The filter passage 1a4 is inclined towards the water outlet end 1a2. The upper end of the filter passage 1a4 is in communication with the water passage 1d, and the lower end of the filter passage 1a4 is in communication with the inlet of the water outlet end 1a2. The filter passage 1a4 is provided with a cylindrical filter screen 9, and the inner side of the cylindrical filter screen 9 is provided with an elastic check valve assembly 10. The elastic check valve assembly 10 comprises a check valve core 10a and an elastic check valve spring 10b. The lower end of the filter passage 1a4 is provided with a plug, and the two ends of the elastic check valve spring 10b are respectively in abutment with the inner side top wall of the check valve core 10a and the inner side bottom wall of the plug. The side of the check valve core 10a is provided with a through hole 10a1, and the through hole 10a1 is opposite to the communication position of the water outlet end 1a2 and the filter passage 1a4. The filter passage 1a4 is provided with the cylindrical filter screen 9 and the elastic check valve assembly 10, so that the multifunctional front pressure reducing valve is integrated with the filter and check valve functions, and has more functions, higher practical value and smaller size.

[0050] Embodiment Two

[0051] The structure and principle of the embodiment are basically the same as those of the embodiment one, and the difference is that, as shown in Figure 7 and Figure 8 In the embodiment, the end of the water outlet end 1a2 is provided with an expanded section 1a21, and the expanded section 1a21 is provided with a control rod and a ball core 13 for adjusting the water flow of the water outlet end 1a2. One end of the control rod is connected with the ball core 13, and the other end of the control rod extends out of the expanded section 1a21 and is connected with a handle 14.

[0052] The outlet of the water outlet end 1a2 is provided with the expanded section 1a21, and the expanded section 1a21 is provided with the control rod and the ball core 13, so that the user can adjust the water flow, and the multifunctional front pressure reducing valve is integrated with the flow adjusting function.

[0053] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, without departing from the spirit of the present application or exceeding the scope defined by the appended claims.

Claims

1. A multifunctional front pressure reducing valve, comprising a valve body (1) and an elastic pressure reducing assembly (2) arranged in the valve body (1) and capable of adjusting the outlet water pressure, the elastic pressure reducing assembly (2) comprising a pressure reducing core (2a) and a pressure reducing spring (2b) acting on the pressure reducing core (2a), a rotatable valve rod (3) being arranged in the upper end of the valve body (1), characterized in that, The valve body (1) upper end is externally provided with a lock cap (4), the lock cap (4) and the valve body (1) are provided with a magnetic locking mechanism (5) that can fix the two circumferentially, the valve stem (3) and the valve body (1) are axially limited and the valve stem (3) upper end is circumferentially fixed with the lock cap (4), the lower end of the valve stem (3) is threadedly connected with a pressure sleeve (6), the pressure sleeve (6) is circumferentially fixed with the valve body (1), when the valve stem (3) rotates, the pressure sleeve (6) can push the pressure reducing core (2a) to overcome the elastic force of the pressure reducing spring (2b) and close the pressure reducing valve; the valve body (1) comprises a body (1a) and a valve cover (1c) threadedly connected to the lower end of the body (1a), the lower end of the valve cover (1c) is open and the valve cover (1c) is threadedly connected with an adjusting head (7) in the inside, the upper end of the pressure reducing spring (2b) abuts against the lower end face of the pressure reducing core (2a), the lower end of the pressure reducing spring (2b) abuts against the upper end face of the adjusting head (7), the multifunctional front pressure reducing valve further comprises a key (8) that can be sleeved on the lock cap (4) and unlock the magnetic locking mechanism (5), the upper end face of the lock cap (4) is symmetrically provided with two insertion slots (4a), the adjusting head (7) is a circular block, the lower end face of the adjusting head (7) is symmetrically provided with two connection grooves (7a), the key (8) is a cylindrical shape, the outer diameter of the key (8) is slightly smaller than the inner diameter of the valve cover (1c), the lower end face of the key (8) is symmetrically provided with two insertion pins (8a) that can be inserted into the insertion slots (4a) or the connection grooves (7a), the lower end face of the key (8) is provided with a magnet (8b) that is magnetically the same as the magnetic column (5c) of the magnetic locking mechanism (5), the upper end face of the lock cap (4) is provided with a convex head (4b) in the center, and the lower end face of the key (8) is provided with a matching cavity (8c) in the center.

2. The multifunctional pre-table pressure reducing valve according to claim 1, characterized by The pressure reducing core (2a) is provided with a guide hole (2a33), the pressure sleeve (6) is a cylindrical shape, the upper end outer circumferential surface of the pressure sleeve (6) is provided with an annular matching part (6a), the annular matching part (6a) is circumferentially fixed with the valve body (1), and the lower end of the pressure sleeve (6) is located in the port of the guide hole (2a33).

3. The multifunctional pre-table pressure reducing valve according to claim 2, characterized by The upper end of the valve body (1) is internally provided with a matching hole (1b1) that is a non-circular hole, the annular matching part (6a) is located in the matching hole (1b1), the shape of the annular matching part (6a) is the same as the shape of the matching hole (1b1), and the opening depth of the matching hole (1b1) is greater than the distance from the upper end surface of the pressure sleeve (6) to the bottom wall of the guide hole (2a33).

4. The multifunctional pre-table pressure reducing valve according to claim 3, characterized by The valve body (1) left and right ends are water inlet end (1a1) and water outlet end (1a2) respectively, the valve body (1) is equipped with water passing cavity (1d), water passing cavity (1d) is equipped with water inlet channel (1a3) along vertical direction and is connected with water inlet end (1a1), pressure reducing core (2a) includes core rod (2a1) passing through water inlet channel (1a3), baffle (2a2) fixed to the lower end of core rod (2a1) and water retaining head (2a3) fixed to the upper end of core rod (2a1), guide hole (2a33) is arranged at the upper end of water retaining head (2a3), the lower end surface of water retaining head (2a3) is embedded with sealing gasket (2a4), the elastic pressure reducing assembly (2) further includes buffer spring (2c) acting on pressure reducing core (2a) downward, the elastic force of pressure reducing spring (2b) is greater than the elastic force of buffer spring (2c).

5. The multifunctional pre-table pressure reducing valve according to claim 4, characterized by The valve body (1) further includes valve cap (1b) screwing on the upper end of body (1a), valve stem (3) is arranged in valve cap (1b), the lower end surface of valve cap (1b) is provided with concave cavity, the top wall of concave cavity is provided with annular flange (1b2), cooperation hole (1b1) is located inside annular flange (1b2), water retaining head (2a3) includes base (2a31) and positioning column (2a32) protruding from the center of the upper end surface of base (2a31), guide hole (2a33) is arranged on positioning column (2a32), the upper and lower ends of buffer spring (2c) are respectively sleeved on annular flange (1b2) and positioning column (2a32).

6. The multifunctional pre-table pressure reducing valve according to claim 4, characterized by The water outlet end (1a2) and the water passing cavity (1d) are provided with a filter channel (1a4), the filter channel (1a4) is inclined towards the water outlet end (1a2), the upper end of the filter channel (1a4) is connected with the water passing cavity (1d), the lower end side of the filter channel (1a4) is connected with the inlet of the water outlet end (1a2), the filter channel (1a4) is provided with a cylindrical filter screen (9), the inner side of the cylindrical filter screen (9) is provided with an elastic check valve assembly (10), the elastic check valve assembly (10) includes a check valve core (10a) and a check valve spring (10b), the lower end of the filter channel (1a4) is screw-connected with a plug cover, the two ends of the check valve spring (10b) are respectively abutted with the inner top wall of the check valve core (10a) and the inner bottom wall of the plug cover, the side of the check valve core (10a) is provided with a through hole (10a1), the communication part of the water outlet end (1a2) and the filter channel (1a4) is opposite to the through hole (10a1).

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