Adjustable water replenishing valve

Abstract

An adjustable water replenishing valve comprises a valve body, a water inlet connector arranged on the left side of the valve body and a water outlet connector arranged on the right side of the valve body, a water replenishing cavity is formed in the lower portion of the valve body, a pressure regulating cavity is formed in the upper portion of the valve body, and a pressure regulating structure matched with the pressure regulating cavity is arranged at a cavity opening in the upper side of the pressure regulating cavity. A cavity opening in the lower side of the water supplementing cavity is provided with a water supplementing structure matched with the water supplementing cavity, the water supplementing cavity is communicated with the pressure adjusting cavity through an opening and closing hole, and the water supplementing structure comprises an opening and closing piece; the pressure regulating structure comprises a valve core rod; an opening and closing head is arranged at the upper end of the opening and closing piece; a sealing groove is formed in the upper surface of the opening and closing head; and a screw hole is formed in the center of the bottom of the sealing groove. The adjustable water replenishing valve can effectively avoid the situation of sealing failure caused by continuous friction between the opening and closing piece and the opening and closing hole opening, and effectively guarantees the sealing performance when the opening and closing piece seals the opening and closing hole.

Description

Technical Field

[0001] The utility model relates to the field of make-up water valves, in particular to an adjustable make-up water valve. Background Technique

[0002] A make-up water valve is a new type of valve installed on the make-up water pipeline of a closed-loop heating or cooling system. It can automatically maintain the system pressure at a set value and prevent the hot water in the heating system from flowing back to the cold water pipeline, integrating the functions of a pressure reducing valve, a globe valve, and a check valve.

[0003] The make-up water valve has a water outlet joint and a water inlet joint. When the water pressure at the water outlet joint decreases, the water flow in the pipeline connected to the water inlet joint will, under the action of the pressure difference, the opening and closing member in the make-up water valve will no longer block the opening and closing hole, and the water flow will flow through the opening and closing hole to the water outlet joint and finally flow out from the water outlet joint for make-up water. After the pressure is restored with make-up water, the opening and closing member will block and seal the opening and closing hole again, and the make-up water valve will close and stop making up water. It can be seen that during the actual use of the make-up water valve, the opening and closing member will continuously rub against the orifice of the opening and closing hole, and it is easy to wear. The opening and closing member relies on itself to avoid fitting with the orifice of the opening and closing hole to achieve the sealing of the opening and closing hole. Once the opening and closing member or the orifice of the opening and closing hole is worn, water leakage will occur, ultimately affecting the effect of the make-up water valve in maintaining the system pressure. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide an adjustable make-up water valve, which can effectively avoid the situation that the opening and closing member continuously rubs against the orifice of the opening and closing hole, resulting in seal failure, and effectively ensure the sealing performance when the opening and closing member seals the opening and closing hole.

[0005] The technical solution adopted by the utility model to solve the above technical problems is as follows:

[0006] The utility model discloses an adjustable water replenishing valve, which comprises a valve body, a water inlet joint arranged on the left side of the valve body, and a water outlet joint arranged on the right side of the valve body. A water replenishing cavity is arranged at the lower part of the valve body, and a pressure regulating cavity is arranged at the upper part of the valve body. A pressure regulating structure matching with the upper side cavity opening of the pressure regulating cavity is arranged. The water inlet joint is communicated with the water replenishing cavity through a water inlet hole. A water replenishing structure matching with the lower side cavity opening of the water replenishing cavity is arranged. The water replenishing cavity is communicated with the pressure regulating cavity through an opening and closing hole. The water replenishing structure comprises an opening and closing member; the pressure regulating structure comprises a valve core rod; an opening and closing head is arranged at the upper end of the opening and closing member, and the diameter of the opening and closing head is larger than that of the opening and closing member; a sealing groove is arranged on the upper surface of the opening and closing head; a screw hole is arranged at the center of the bottom of the sealing groove; the lower end of the valve core rod sequentially passes through the opening and closing hole and the sealing groove downward and is screwed in the screw hole; the diameter of the valve core rod is smaller than that of the opening and closing hole; an annular pressing plate is arranged on the outer wall of the lower part of the valve core rod, and the diameter of the pressing plate is smaller than that of the opening and closing hole; a sealing ring sleeving the lower end of the valve core rod is arranged in the sealing groove, and the sealing ring is made of rubber; the sealing ring is located between the lower surface of the pressing plate and the bottom of the sealing groove; the lower end hole opening of the opening and closing hole extends downward to form an annular sealing head; the diameter of the sealing head gradually decreases from top to bottom.

[0007] An annular limiting part extends inward from the inner wall of the upper side groove opening of the sealing groove; the inner diameter of the limiting part is larger than the outer diameter of the upper end of the sealing head.

[0008] An annular auxiliary groove is arranged on the outer wall of the lower end of the valve core rod; an auxiliary part matching with the auxiliary groove extends inward from the edge of the lower end hole opening of the inner hole of the sealing ring; the auxiliary part is integrally formed with the sealing ring, and the auxiliary part is made of rubber.

[0009] The water replenishing structure further comprises an adjusting seat screwed on the lower side cavity opening of the water replenishing cavity; an adjusting hole is arranged at the center of the adjusting seat; a lower lead screw matching with the adjusting hole is screwed at the lower part of the adjusting hole; the lower end of the lower lead screw extends downward out of the adjusting hole and is provided with a hand wheel; the lower end of the opening and closing member penetrates downward into the upper part of the adjusting hole; a positioning head is arranged at the center of the upper end surface of the lower lead screw; a spring hole is arranged at the center of the lower end surface of the opening and closing member; a lower spring is arranged between the bottom of the spring hole and the upper end surface of the lower lead screw, and the lower end of the lower spring sleeves the positioning head.

[0010] A plurality of annular grooves are axially and uniformly distributed on the outer wall of the part of the opening and closing member located in the adjusting hole, and O-rings matching with the annular grooves are arranged in the annular grooves.

[0011] The pressure regulating structure further includes an upper cover screwed to the upper side orifice of the pressure regulating chamber; an annular limiting step is provided on the inner wall of the upper side orifice of the pressure regulating chamber; a diaphragm is provided between the lower surface of the upper cover and the limiting step; an annular clamping portion is provided on the upper part of the valve core rod; a through hole is provided in the center of the diaphragm; the upper end of the valve core rod passes upward through the through hole, and the lower surface of the diaphragm is in contact with the upper surface of the clamping portion; a gasket in contact with the upper surface of the diaphragm is sleeved on the upper end of the valve core rod; a nut in contact with the upper surface of the gasket is externally screwed on the upper end of the valve core rod; a rotation hole is provided in the center of the upper surface of the upper cover; an upper lead screw is provided inside the upper cover; the upper end of the upper lead screw is located in the rotation hole, and a slot in the shape of a cross is provided on the upper end surface of the upper lead screw; a positioning portion in contact with the inner wall of the upper side of the upper cover is provided on the outer wall of the upper part of the upper lead screw; a sliding sleeve matching with the upper lead screw is externally screwed on the upper lead screw; symmetric sliding grooves are provided on the inner walls of the left and right sides of the upper cover; sliding blocks matching with the sliding grooves are provided on the left and right sides of the outer wall of the upper end of the sliding sleeve; an upper spring is sleeved on the upper lead screw, the upper end of the upper spring presses against the lower surface of the sliding block, and the lower end of the upper spring presses against the upper surface of the gasket.

[0012] An annular positioning groove is provided on the upper surface of the adjusting seat; a filter screen cylinder sleeved on the opening and closing head is provided between the bottom of the positioning groove and the upper side wall of the water replenishing chamber; the water inlet hole is located outside the filter screen cylinder.

[0013] The beneficial effects of the present utility model are as follows:

[0014] Compared with the prior art, the adjustable water replenishing valve adopting the structure of the present utility model can seal the lower end port of the sealing head through the sealing ring to close the lower end orifice of the opening and closing hole. The sealing ring is made of rubber and has an anti-wear effect. Even if the upper surface of the sealing ring continuously rubs against the lower end surface of the sealing head, wear can be avoided. Moreover, the sealing ring is restricted in the sealing groove by the pressing plate. This fixing method is conducive to the replacement of the sealing ring. After the elasticity of the sealing ring weakens, the sealing ring can be quickly replaced. In the initial stage when the elasticity of the sealing ring weakens, the pressing plate can be made to press the sealing ring downward by rotating the valve core rod. When the sealing ring is pressed by the pressing plate against the bottom of the sealing groove, the sealing ring will expand and deform outward. At this time, the outer peripheral surface of the sealing ring further fits with the inner wall of the sealing groove. Therefore, when the elasticity of the sealing ring weakens, the sealing effect of the sealing ring can always be ensured without replacing the sealing ring, and the situation of water leakage caused by the sealing failure of the sealing ring is maximally avoided, achieving the effect of preventing water leakage. Description of the Drawings

[0015] Figure 1 is a sectional view of the adjustable water replenishing valve of the present utility model;

[0016] Figure 2 is Figure 1 an enlarged view of part A of

[0017] Figure 3This is a schematic structural view of the adjustable water replenishing valve of the present utility model. Specific embodiments

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0019] Please refer to Figures 1 to 3 , the present utility model provides an adjustable water replenishing valve, which includes a valve body 1, a water inlet joint 2 provided on the left side of the valve body 1, and a water outlet joint 3 provided on the right side of the valve body 1. A water replenishing cavity 4 is provided at the lower part of the valve body 1, and a pressure regulating cavity 5 is provided at the upper part of the valve body 1. A pressure regulating structure matching the upper side cavity opening of the pressure regulating cavity 5 is provided. The water inlet joint 2 is communicated with the water replenishing cavity 4 through a water inlet hole 6. A water replenishing structure matching the lower side cavity opening of the water replenishing cavity 4 is provided. The water replenishing cavity 4 is communicated with the pressure regulating cavity 5 through an opening and closing hole 7. The water replenishing structure includes an opening and closing member 8; the pressure regulating structure includes a valve core rod 9; an opening and closing head 10 is provided at the upper end of the opening and closing member 8, and the diameter of the opening and closing head 10 is larger than the diameter of the opening and closing member 8; a sealing groove 11 is provided on the upper surface of the opening and closing head 10; a screw hole 12 is provided at the center of the bottom of the sealing groove 11; the lower end of the valve core rod 9 sequentially passes through the opening and closing hole 7 and the sealing groove 11 downward and is screwed into the screw hole 12; the diameter of the valve core rod 9 is smaller than the diameter of the opening and closing hole 7; an annular pressing plate 13 is provided on the outer wall of the lower part of the valve core rod 9, and the diameter of the pressing plate 13 is smaller than the diameter of the opening and closing hole 7; a sealing ring 14 sleeved on the lower end of the valve core rod 9 is provided in the sealing groove 11, and the sealing ring 14 is made of rubber; the sealing ring 14 is located between the lower surface of the pressing plate 13 and the bottom of the sealing groove 11; a sealing head 15 in the shape of a ring extends downward from the lower end hole opening of the opening and closing hole 7; the diameter of the sealing head 15 gradually decreases from top to bottom.

[0020] An annular limiting portion 16 extends inward from the inner wall of the upper side groove opening of the sealing groove 11; the inner diameter of the limiting portion 16 is larger than the outer diameter of the upper end of the sealing head 15.

[0021] An annular auxiliary groove 17 is provided on the outer wall of the lower end of the valve core rod 9; an auxiliary portion 18 matching the auxiliary groove 17 extends inward from the edge of the lower end hole opening of the inner hole of the sealing ring 14; the auxiliary portion 18 is integrally formed with the sealing ring 14, and the auxiliary portion 18 is made of rubber.

[0022] The water replenishing structure further includes an adjusting seat 19 screwed to the lower side opening of the water replenishing cavity 4; a central adjusting hole 20 is provided inside the adjusting seat 19; a lower lead screw 21 matching with the adjusting hole 20 is screwed to the lower part of the adjusting hole 20; the lower end of the lower lead screw 21 extends downward out of the adjusting hole 20 and is provided with a hand wheel 22; the lower end of the opening and closing member 8 extends downward into the upper part of the adjusting hole 20; a positioning head 23 is provided at the center of the upper end surface of the lower lead screw 21; a spring hole 24 is provided at the center of the lower end surface of the opening and closing member 8; a lower spring 25 is provided between the bottom of the spring hole 24 and the upper end surface of the lower lead screw 21, and the lower end of the lower spring 25 is sleeved outside the positioning head 23.

[0023] On the outer wall of the part of the opening and closing member 8 located in the adjusting hole 20, a plurality of annular grooves 26 are evenly distributed axially, and O-rings 27 matching with the annular grooves 26 are provided in the annular grooves 26.

[0024] The pressure regulating structure further includes an upper cover 28 screwed to the upper side opening of the pressure regulating cavity 5; an annular limiting step 29 is provided on the inner wall of the upper side opening of the pressure regulating cavity 5; a diaphragm 30 is provided between the lower surface of the upper cover 28 and the limiting step 29; an annular clamping part 31 is provided on the upper part of the valve core rod 9; a through hole 32 is provided at the center of the diaphragm 30; the upper end of the valve core rod 9 passes upward through the through hole 32, and the lower surface of the diaphragm 30 is attached to the upper surface of the clamping part 31; a gasket 33 attached to the upper surface of the diaphragm 30 is sleeved outside the upper end of the valve core rod 9; a nut 34 attached to the upper surface of the gasket 33 is screwed outside the upper end of the valve core rod 9; a rotation hole 35 is provided at the center of the upper surface of the upper cover 28; an upper lead screw 36 is provided inside the upper cover 28; the upper end of the upper lead screw 36 is located in the rotation hole 35, and a slot 37 in the shape of a cross is provided on the upper end surface of the upper lead screw 36; a positioning part 38 attached to the upper side inner wall of the upper cover 28 is provided on the outer wall of the upper part of the upper lead screw 36; a sliding sleeve 39 matching with the upper lead screw 36 is screwed outside the upper lead screw 36; symmetric sliding grooves 40 are provided on the left and right inner walls of the upper cover 28; sliding blocks 41 matching with the sliding grooves 40 are provided on the left and right sides of the outer wall of the upper end of the sliding sleeve 39; an upper spring 42 is sleeved outside the upper lead screw 36, the upper end of the upper spring 42 presses against the lower surface of the sliding block 41, and the lower end of the upper spring 42 presses against the upper surface of the gasket 33.

[0025] An annular positioning groove 43 is provided on the upper surface of the adjusting seat 19; a filter screen cylinder 44 sleeved outside the opening and closing head 10 is provided between the bottom of the positioning groove 43 and the upper side cavity wall of the water replenishing cavity 4; the water inlet hole 6 is located outside the filter screen cylinder 44.

[0026] The usage method of the utility model is as follows:

[0027] When the water pressure at the position of the water outlet joint 3 is less than the water pressure at the position of the water inlet joint 2, the water flow in the pipeline connected to the water inlet joint 2 will flow to the right under the action of the water pressure, and then flow into the water replenishing cavity 4 through the water inlet hole 6. As the water flow continuously surges into the water replenishing cavity 4, the water flow will eventually fill the water replenishing cavity 4. Under the push of the subsequent water flow, the water flow will push down the upper surface of the sealing ring 14 through the upper notch of the sealing groove 11. At this time, the water pressure in the water replenishing cavity 4 is greater than the elasticity of the lower spring 25, and the opening and closing member 8 moves downward along the track of the adjusting hole 20. At this moment, the lower surface of the sealing head 15 no longer tightly presses on the upper surface of the sealing ring 14, and the distance between the sealing head 15 and the sealing ring 14 continuously increases. The water flow in the water replenishing cavity 4 will flow into the pressure regulating cavity 5 through the lower end port of the sealing head 15 and the opening and closing hole 7. The elasticity of the diaphragm 30 in the pressure regulating cavity 5 and the elasticity of the upper spring 42 cooperate to automatically regulate the pressure after the water flow enters the pressure regulating cavity 5, and then convey the water flow with the regulated pressure to the water outlet joint 3, effectively maintaining the pressure of the system. When the pressure at the position of the water outlet joint 3 returns to normal, the pressure of the water inlet joint 2 is no longer greater than the pressure of the water outlet joint 3, and the water inlet joint 2 no longer intakes water. At this moment, the opening and closing head 10 moves upward and resets under the elastic action of the lower spring 25, and the upper surface of the sealing ring 14 tightly presses on the lower end face of the sealing head 15 again, blocking and sealing the lower end orifice of the opening and closing hole 7. At the same time, a check valve core 45 matching the water outlet joint 3 is arranged in the water outlet joint 3, which can effectively prevent the backflow of water when the water pressure at the position of the water outlet joint 3 is greater than the water pressure at the position of the water inlet joint 2.

[0028] As can be seen from the above, the utility model can seal the lower end port of the sealing head 15 through the sealing ring 14 to close the lower end orifice of the opening and closing hole 7. The sealing ring 14 is made of rubber and has an anti-wear effect. Even if the upper surface of the sealing ring 14 continuously rubs against the lower end face of the sealing head 15, wear can be avoided. Moreover, the sealing ring 14 is restricted in the sealing groove 11 by the pressing plate. This fixing method is conducive to the replacement of the sealing ring 14. After the elasticity of the sealing ring 14 weakens, the sealing ring 14 can be quickly replaced. In the initial stage when the elasticity of the sealing ring 14 weakens, the pressing plate 13 can be pressed downward against the sealing ring 14 by rotating the valve core rod 9. When the sealing ring 14 is tightly pressed by the pressing plate 13 against the bottom of the sealing groove 11, the sealing ring 14 will expand and deform outward. At this time, the outer peripheral surface of the sealing ring 14 further fits with the inner wall of the sealing groove 11. Therefore, when the elasticity of the sealing ring 14 weakens, the sealing effect of the sealing ring 14 can always be ensured without replacing the sealing ring 14, and the situation of water leakage caused by the sealing failure of the sealing ring 14 is avoided to the greatest extent, achieving the anti-water leakage effect.

[0029] The diameter of the sealing head 15 gradually decreases from top to bottom. This structural design can ensure to the greatest extent that the lower end of the sealing head 15 can tightly press on the upper surface of the sealing ring 14 through the upper notch of the sealing groove 11.

[0030] An annular limiting portion 16 extends inward from the inner wall of the upper notch of the sealing groove 11. The inner diameter of the limiting portion 16 is larger than the outer diameter of the upper end of the sealing head 15. The limiting portion 16 can further limit the sealing ring 14 within the sealing groove 11, ensuring the stability of the sealing ring 14 when it is embedded in the sealing groove 11.

[0031] An annular auxiliary groove 17 is provided on the outer wall of the lower end of the valve core rod 9. An auxiliary portion 18 that matches the auxiliary groove 17 extends inward from the edge of the lower end hole of the inner hole of the sealing ring 14. The auxiliary portion 18 is integrally formed with the sealing ring 14. The auxiliary portion 18 is made of rubber. The existence of the auxiliary portion 18 can further increase the extrusion area of the sealing ring 14 when the valve core rod 9 moves downward, further improving the degree of expansion and deformation of the sealing ring 14, and thus further improving the sealing effect of the sealing ring 14.

[0032] During the actual water replenishment process, different requirements for the water flow rate during water replenishment exist according to different situations. When it is necessary to adjust the water flow rate, the lower screw rod 21 can be rotated by the handwheel 22. When the lower screw rod 21 moves upward, the greater the initial elasticity generated by the compression of the lower spring 25, the shorter the stroke generated by the closing head 10 being pressed downward by the water pressure, and the smaller the water flow rate. When the lower screw rod 21 moves downward, the smaller the initial elasticity generated by the compression of the lower spring 25, the longer the stroke generated by the closing head 10 being pressed downward by the water pressure, and the larger the water flow rate.

[0033] A plurality of annular grooves 26 are axially and uniformly distributed on the outer wall of the part of the closing member 8 located in the adjustment hole 20. O-rings 27 that match the annular grooves 26 are provided in the annular grooves 26. The existence of the O-rings 27 can effectively ensure the sealing performance between the outer wall of the closing member 8 and the inner wall of the adjustment hole 20.

[0034] The pressure regulating structure further includes an upper cover 28 screwed to the upper cavity opening of the pressure regulating cavity 5; an annular limiting step 29 is provided on the inner wall of the upper cavity opening of the pressure regulating cavity 5; a diaphragm 30 is provided between the lower surface of the upper cover 28 and the limiting step 29; an annular clamping portion 31 is provided on the upper part of the valve core rod 9; a through hole 32 is provided in the center of the diaphragm 30; the upper end of the valve core rod 9 passes upward through the through hole 32, and the lower surface of the diaphragm 30 is in contact with the upper surface of the clamping portion 31; a gasket 33 in contact with the upper surface of the diaphragm 30 is sleeved on the upper end of the valve core rod 9; a nut 34 in contact with the upper surface of the gasket 33 is externally screwed on the upper end of the valve core rod 9; a rotating hole 35 is provided in the center of the upper surface of the upper cover 28; an upper lead screw 36 is provided inside the upper cover 28; the upper end of the upper lead screw 36 is located in the rotating hole 35, and a slot 37 in the shape of a cross is provided on the upper end surface of the upper lead screw 36; a positioning portion 38 in contact with the upper inner wall of the upper cover 28 is provided on the outer wall of the upper part of the upper lead screw 36; a sliding sleeve 39 matching with the upper lead screw 36 is externally screwed on the upper lead screw 36; symmetric sliding grooves 40 are provided on the left and right inner walls of the upper cover 28; sliding blocks 41 matching with the sliding grooves 40 are provided on the left and right outer walls of the upper end of the sliding sleeve 39; an upper spring 42 is sleeved on the upper lead screw 36, the upper end of the upper spring 42 abuts against the lower surface of the sliding block 41, and the lower end of the lower spring 25 abuts against the upper surface of the gasket 33.

[0035] When it is necessary to adjust the pressure regulating effect of the diaphragm 30 and the upper spring 42, a corresponding flat screwdriver can be inserted into the slot 37, and then the upper end of the upper lead screw 36 is rotated. Since the sliding blocks 41 on the left and right sides of the upper end of the sliding sleeve 39 match the sliding grooves 40 on the left and right inner walls of the upper cover 28, when the upper lead screw 36 rotates, the sliding sleeve 39 will move up and down along the track of the upper lead screw 36. When the sliding sleeve 39 moves down, the elasticity generated by the diaphragm 30 and the upper spring 42 is greater, and the buffering effect on the water pressure is stronger. When the sliding sleeve 39 moves up, the elasticity generated by the diaphragm 30 and the lower spring 25 becomes smaller, and the buffering effect on the water pressure will become weaker.

[0036] An annular positioning groove 43 is provided on the upper surface of the adjusting seat 19. A filter screen cylinder 44 sleeved outside the opening and closing head 10 is provided between the bottom of the positioning groove 43 and the upper cavity wall of the water replenishing cavity 4. The water inlet hole 6 is located outside the filter screen cylinder 44. The filter screen cylinder 44 can filter impurities in the water flow flowing from the water inlet joint 2 into the water replenishing cavity 4, preventing impurities from entering the water replenishing cavity 4 and remaining on the upper surface of the sealing ring 14 and the lower end surface of the sealing head 15, thus avoiding the situation that the presence of impurities between the upper surface of the sealing ring 14 and the lower end surface of the sealing head 15 affects the sealing effect due to their inability to fit tightly.

Claims

1. An adjustable water supply valve, comprising a valve body, a water inlet joint arranged on the left side of the valve body and a water outlet joint arranged on the right side of the valve body, a water supply chamber is arranged at the lower part of the valve body, a pressure regulating chamber is arranged at the upper part of the valve body, a pressure regulating structure matching with it is arranged at the upper cavity opening of the pressure regulating chamber, the water inlet joint is connected with the water supply chamber through the water inlet hole, a water supply structure matching with it is arranged at the lower cavity opening of the water supply chamber, and the water supply chamber and the pressure regulating chamber are connected through the opening and closing hole, characterized in that: The water replenishment structure includes an opening and closing part; the pressure regulating structure includes a valve core rod; an opening and closing head is provided at the upper end of the opening and closing part, and the diameter of the opening and closing head is larger than the diameter of the opening and closing part; a sealing groove is provided on the upper surface of the opening and closing head; a screw hole is provided at the center of the bottom of the sealing groove; the lower end of the valve core rod passes downward through the opening and closing hole and the sealing groove in sequence and is screwed into the screw hole; the diameter of the valve core rod is smaller than the diameter of the opening and closing hole; an annular pressure plate is provided on the outer wall of the lower part of the valve core rod, and the diameter of the pressure plate is smaller than the diameter of the opening and closing hole; a set of sealing rings is provided on the outside of the lower end of the valve core rod in the sealing groove, and the sealing ring is made of rubber; the sealing ring is located between the lower surface of the pressure plate and the bottom of the sealing groove; an annular sealing head extends downward from the lower end of the opening and closing hole; the diameter of the sealing head gradually decreases from top to bottom.

2. The adjustable water supply valve according to claim 1, characterized in that: An annular limiting portion is extended inwardly from the inner wall of the upper notch of the sealing groove; the inner diameter of the limiting portion is greater than the outer diameter of the upper end of the sealing head.

3. The adjustable water supply valve according to claim 1, characterized in that: An annular auxiliary groove is provided on the outer wall of the lower end of the valve core rod; an auxiliary part matching the auxiliary groove extends inward from the edge of the lower end of the inner hole of the sealing ring; the auxiliary part is integrally formed with the sealing ring, and the auxiliary part is made of rubber.

4. The adjustable water supply valve according to claim 1, characterized in that: The water replenishment structure also includes an adjustment seat screwed to the lower side cavity opening of the water replenishment cavity; an adjustment hole is provided in the center of the adjustment seat; a lower screw rod matching the adjustment hole is screwed to the lower part of the adjustment hole; the lower end of the lower screw rod passes downward to the outside of the adjustment hole and is provided with a hand wheel; the lower end of the opening and closing member passes downward into the upper part of the adjustment hole; a positioning head is provided in the center of the upper end face of the lower screw rod; a spring hole is provided in the center of the lower end face of the opening and closing member; a lower spring is provided between the bottom of the spring hole and the upper end face of the lower screw rod, and the lower end of the lower spring is sleeved outside the positioning head.

5. The adjustable water supply valve according to claim 4, characterized in that: The outer wall of the opening and closing member located in the adjusting hole is provided with a plurality of annular grooves evenly distributed in the axial direction, and an O-ring matching with the annular groove is provided in the annular groove.

6. The adjustable water supply valve according to claim 1, characterized in that: The pressure regulating structure also includes an upper cover screwed to the upper cavity opening of the pressure regulating chamber; an annular limiting step is provided on the inner wall of the upper cavity opening of the pressure regulating chamber; a diaphragm is provided between the lower surface of the upper cover and the limiting step; an annular clamping portion is provided on the upper part of the valve core rod; a through hole is provided in the center of the diaphragm; the upper end of the valve core rod passes through the through hole upward, and the lower surface of the diaphragm fits with the upper surface of the clamping portion; a gasket fits with the upper surface of the diaphragm is provided on the upper end of the valve core rod; a nut fits with the upper surface of the gasket is screwed externally on the upper end of the valve core rod; the upper surface of the upper cover A rotating hole is provided in the center; an upper screw rod is provided in the upper cover; the upper end of the upper screw rod is located in the rotating hole, and a straight-shaped slot is provided on the upper end surface of the upper screw rod; a positioning portion is provided on the upper outer wall of the upper screw rod, which fits with the upper inner wall of the upper cover; a matching sliding sleeve is screwed externally on the upper screw rod; symmetrical sliding grooves are provided on the left and right inner walls of the upper cover; sliding blocks matching the sliding grooves are provided on the left and right sides of the outer wall of the upper end of the sliding sleeve; an upper spring is provided on the outer sleeve of the upper screw rod, the upper end of the upper spring presses against the lower surface of the sliding block, and the lower end of the upper spring presses against the upper surface of the gasket.

7. The adjustable water supply valve according to claim 4, characterized in that: An annular positioning groove is provided on the upper surface of the adjustment seat; a filter screen cylinder outside the opening and closing head is provided between the bottom of the positioning groove and the upper wall of the water replenishment cavity; and the water inlet hole is located outside the filter screen cylinder.

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