Pressure reducing valve

Abstract

The pressure reducing valve comprises a pressure reducing valve seat, a pressure reducing valve body, a liquid inlet, a liquid outlet, a pressure reducing valve moving body, a pressure reducing valve reset spring, an exhaust hole and a one-way sealing ring. The filter screen is mounted at the liquid inlet through a detachable mounting structure; the annular filter screen is fixedly mounted at the liquid outlet; through the arrangement of the detachable installation structure, disassembly and assembly of the filter screen are achieved, the filter screen is convenient to clean or replace, and impurities are prevented from entering the pressure reducing valve and damaging the pressure reducing valve; through the arrangement of the rotating block and the rotating shaft, an operator can press the rotating block to enable the fixed block to be separated from the tooth groove and enable the gear to be meshed with the tooth groove, and then can rotate the rotating block to adjust the position of the movable block, so that a circulation gap between the pressure reducing valve movable body and the connecting hole is controlled, pressure reducing adjustment is conducted on fluid, and after adjustment is completed, the pressure reducing valve is opened. The fixed block can be meshed with the tooth groove under the action of the spring, and the movable block is fixed to the current position.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a pressure reducing valve. Background Art

[0002] The pressure reducing valve is a valve that reduces the inlet pressure to a certain required outlet pressure by adjusting it, and automatically maintains the outlet pressure stable by relying on the energy of the medium itself. From the perspective of fluid mechanics, the pressure reducing valve is a throttling element with variable local resistance, that is, by changing the throttling area, the flow rate and the kinetic energy of the fluid are changed, resulting in different pressure losses, thereby achieving the purpose of pressure reduction.

[0003] For example, a Chinese utility model disclosed in publication number CN219549701U discloses a pressure reducing valve. The valve core is positioned below the valve seat, where a locking nut assembly is provided to prevent the valve seat from loosening and detaching from the valve core. This effectively ensures the operating stability of the pressure reducing valve. However, this structure still has the following significant drawbacks:

[0004] 1. Existing pressure reducing valves are generally not equipped with a pipe orifice filter device at the inlet. When the fluid enters the valve, large particles of impurities follow and enter the valve body, which may cause the valve shaft to malfunction. Long-term wear has also led to reduced sealing performance of the pressure reducing valve.

[0005] 2. Existing pressure reducing valves cannot adjust the pressure inside the valve when in use. Valves without pressure regulation function cannot adjust the pressure in the fluid pipeline, which may cause the pressure in the pipeline to exceed the required range, thereby causing problems. Summary of the Invention

[0006] The utility model aims to solve one of the technical problems existing in the prior art.

[0007] The present application provides a pressure reducing valve, comprising:

[0008] Pressure reducing valve seat, pressure reducing valve body, liquid inlet, liquid outlet, pressure reducing valve actuator, pressure reducing valve return spring, exhaust hole, one-way sealing ring;

[0009] Also includes:

[0010] A filter screen is mounted at the liquid inlet via a detachable mounting structure;

[0011] A ring filter is fixedly installed at the liquid outlet.

[0012] The detachable mounting structure includes:

[0013] A mounting cavity, which is arranged in the valve seat of the pressure reducing valve;

[0014] a locking groove, which is arranged on the outer side of the filter screen;

[0015] a locking member, which is used to be inserted into the locking groove to lock the filter screen at the liquid inlet;

[0016] An unlocking member is used to disengage the locking member from the locking groove to release the locking state of the filter screen.

[0017] Locking parts include:

[0018] a locking block, which is slidably mounted in the mounting cavity and inserted into the locking groove;

[0019] A return spring, one end of which is fixedly connected to the locking block, and the other end of which is fixedly connected to the inner side wall of the installation cavity.

[0020] Unlocking parts include:

[0021] a pushing groove, which is arranged on the outer side of the valve seat of the pressure reducing valve;

[0022] a pushing block, which is slidably mounted in the pushing groove;

[0023] A movable cavity, which is arranged in the valve seat of the pressure reducing valve and is connected with the installation cavity and the pushing groove;

[0024] A connecting piece is used for the cooperative transmission between the locking block and the pushing block.

[0025] Connectors include:

[0026] A connecting rod is movably mounted in the movable cavity via a rotating shaft, wherein one end of the connecting rod is provided with a first connecting circular groove, and the other end is provided with a second connecting circular groove;

[0027] A No. 1 connecting cylinder, which is provided on the locking block and is slidably mounted in the No. 1 connecting circular groove;

[0028] The second connecting cylinder is arranged on the pushing block and is slidably installed in the second connecting circular groove.

[0029] Also includes:

[0030] A rotating chamber, which is arranged in the valve body of the pressure reducing valve and is communicated with the inner cavity of the valve body of the pressure reducing valve;

[0031] a movable block, which is slidably mounted in the inner cavity of the pressure reducing valve body, and a tooth groove is provided on a side of the movable block facing the rotating cavity;

[0032] a fixing member, used for locking the movable block in a current position;

[0033] The rotating member is used to release the locking state of the movable block and to adjust the position of the movable block in the inner cavity of the valve body of the pressure reducing valve.

[0034] Fixing parts include:

[0035] A fixed block is slidably mounted in the rotating cavity, and a gear block is provided at one end of the fixed block facing the movable block;

[0036] a spring, one end of which is fixedly connected to the fixed block, and the other end of which is fixedly connected to the inner wall of the rotating chamber;

[0037] Wherein, the fixed block is engaged with the movable block.

[0038] Rotating parts include:

[0039] a rotating shaft, which is slidably mounted in the rotating chamber, with the top end of the rotating shaft extending out of the pressure reducing valve body;

[0040] a gear fixedly connected to the bottom end of the rotating shaft;

[0041] a rotating block fixedly connected to the top end of the rotating shaft;

[0042] The bottom surface of the gear is in contact with the top surface of the fixed block, and a pressable space is left between the rotating block and the valve body of the pressure reducing valve.

[0043] The rotating parts also include:

[0044] A sliding groove, which is provided in the valve body of the pressure reducing valve and is connected to the rotating chamber;

[0045] a sliding block, which is fixedly connected to the rotating shaft and can slide up and down in the sliding groove;

[0046] Wherein, the cross sections of the sliding groove and the sliding block are both circular.

[0047] Also includes:

[0048] an indicator mark, which is arranged on the outer side wall of the rotating block;

[0049] An indicating scale is arranged on the outer side wall of the pressure reducing valve body.

[0050] The beneficial effects of the utility model are as follows:

[0051] 1. The detachable mounting structure enables the filter to be quickly installed and disassembled, making it convenient for operators to clean or replace the filter, thus preventing impurities from entering the pressure reducing valve along with the fluid, causing the pressure reducing valve to malfunction.

[0052] 2. Through the setting of the rotating block and the rotating shaft, the operator can press the rotating block to separate the fixed block from the tooth groove and engage the gear with the tooth groove. Then, by rotating the rotating block, the position of the movable block can be easily adjusted, thereby controlling the flow gap between the moving body and the connecting hole of the pressure reducing valve to reduce the pressure of the high-pressure fluid. After the adjustment is completed, the fixed block will re-engage with the tooth groove under the influence of the spring to fix the movable block in the current position. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 This is a schematic structural diagram of a pressure reducing valve in an embodiment of the present application;

[0054] Figure 2 This is a schematic diagram of the internal structure of the pressure reducing valve in the embodiment of the present application;

[0055] Figure 3 for Figure 2 A magnified structural diagram at center A;

[0056] Figure 4 for Figure 2 Enlarged structure diagram at point B

[0057] Figure 5 for Figure 1 Schematic diagram of the cross-sectional structure in the CC direction;

[0058] Figure 6 for Figure 1 Enlarged structural diagram at point D in the middle.

[0059] Reference numerals

[0060] 1-pressure reducing valve seat, 2-pressure reducing valve body, 3-liquid inlet, 4-liquid outlet, 5-pressure reducing valve moving body, 6-pressure reducing valve return spring, 7-exhaust hole, 8-one-way sealing ring, 9-filter, 10-detachable mounting structure, 101 mounting cavity, 102-locking groove, 103-locking piece, 1031-locking block, 1032-reset spring, 104-unlocking piece, 105-push groove, 106-push block, 107-active cavity, 108-connecting piece, 109-connecting rod, 110-Connecting circular groove No. 1, 111-Connecting circular groove No. 2, 112-Connecting cylinder No. 1, 113-Connecting cylinder No. 2, 11-Annular filter, 121-Rotating chamber, 122-Moving block, 123-Tooth groove, 124-Fixed part, 1241-Fixed block, 1242-Spring, 125-Rotating part, 1251-Rotating shaft, 1252-Gear, 1253-Rotating block, 1254-Sliding groove, 1255-Sliding block, 126-Indicator mark, 127-Indicator scale. DETAILED DESCRIPTION

[0061] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0062] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0063] The pressure reducing valve provided in the embodiment of the present application is described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0064] Example 1:

[0065] like Figures 1 to 3 As shown, an embodiment of the present application provides a pressure reducing valve, including a pressure reducing valve seat 1, a pressure reducing valve body 2, a liquid inlet 3, a liquid outlet 4, a pressure reducing valve actuator 5, a pressure reducing valve return spring 6, an exhaust hole 7, and a one-way sealing ring 8; it also includes a filter screen 9, which is installed at the liquid inlet 3 through a detachable mounting structure 10; and a ring filter screen 11, which is fixedly installed at the liquid outlet 4.

[0066] Furthermore, the detachable mounting structure 10 includes a mounting cavity 101, which is arranged in the valve seat 1 of the pressure reducing valve; a locking groove 102, which is arranged on the outer side of the filter 9; a locking member 103, which is used to be inserted into the locking groove 102 to lock the filter 9 at the liquid inlet 3; and an unlocking member 104, which is used to disengage the locking member 103 from the locking groove 102 to release the locked state of the filter 9.

[0067] Furthermore, the locking member 103 includes a locking block 1031, which is slidably installed in the installation cavity 101 and inserted into the locking groove 103; a return spring 1032, one end of which is fixedly connected to the locking block 1031 and the other end is fixedly connected to the inner wall of the installation cavity 101.

[0068] Furthermore, the unlocking member 104 includes a pushing groove 105, which is arranged on the outer side of the pressure reducing valve seat 1; a pushing block 106, which is slidably installed in the pushing groove 105; a movable cavity 107, which is arranged in the pressure reducing valve seat 1 and is connected to the installation cavity 101 and the pushing groove 105; and a connecting member 108, which is used for the cooperative transmission between the locking block 1031 and the pushing block 106.

[0069] Furthermore, the connecting member 108 includes a connecting rod 109, which is movably installed in the movable cavity 107 through a rotating shaft, and one end of the connecting rod 109 is provided with a No. 1 connecting circular groove 110, and the other end is provided with a No. 2 connecting circular groove 111; a No. 1 connecting cylinder 112, which is provided on the locking block 1031 and is slidably installed in the No. 1 connecting circular groove 110; a No. 2 connecting cylinder 113, which is provided on the pushing block 106 and is slidably installed in the No. 2 connecting circular groove 111.

[0070] In this embodiment of the present application, due to the adoption of the above-mentioned structure, the pressure reducing valve seat 1 and the pressure reducing valve body 2 are tightly compressed by the willow pressing process, and an inner cavity is provided inside the pressure reducing valve seat 1 and the pressure reducing valve body 2. A connecting hole is provided on the pressure reducing valve seat 1, and the connecting hole is used to connect the inner cavity of the pressure reducing valve seat 1 with the inner cavity of the pressure reducing valve body 2. The pressure reducing valve actuator 5 is slidably installed in the inner cavity of the pressure reducing valve body 2, and one end of the pressure reducing valve return spring 6 is fixedly connected to the pressure reducing valve actuator 5, and the other end is fixed Connected to the movable block 122, a liquid inlet 3 is provided on the end of the pressure reducing valve seat 1 away from the pressure reducing valve body 2, and a liquid outlet 4 is provided on the pressure reducing valve body 2. External pipes are connected to the liquid inlet 3 and the liquid outlet 4 respectively. High-pressure fluid is injected into the inner cavity of the pressure reducing valve seat 1 from the liquid inlet 3, and then the distance between the pressure reducing valve actuator 5 and the connecting hole is adjusted. By controlling and adjusting the flow gap between the pressure reducing valve actuator 5 and the connecting hole, the high-pressure fluid is reduced in pressure, and finally the decompressed fluid is discharged from the liquid outlet 4;

[0071] The pressure reducing valve actuator 5 and the pressure reducing valve body 2 are made of iron-silicon alloy. Iron-silicon alloy has good plasticity and toughness, and is easy to be processed by plastic processing such as cold heading. At the same time, it can also obtain good processing surface quality during local precision processing, which is conducive to ensuring the processing accuracy and quality of the pressure reducing valve.

[0072] The valve seat 1 of the pressure reducing valve is made of PPS. PPS has the advantages of high mechanical strength and high temperature resistance. It can maintain good mechanical properties and stability even in some high temperature environments, and is not prone to deformation, softening or melting, thereby ensuring the normal operation of the pressure reducing valve.

[0073] A filter screen 9 is detachably mounted on the liquid inlet 3 to filter out impurities in the fluid and prevent the valve seat 1 from being blocked. A ring filter screen 11 is fixedly mounted on the liquid outlet 4 to block external impurities and prevent them from blocking the liquid outlet 4. The ring filter screen 11 only blocks external impurities in the event of backflow caused by an external system failure, so it generally does not need to be replaced.

[0074] When removing the filter 9, push the pushing block 106 to the left. Since the middle position of the connecting rod 109 is movably mounted in the movable cavity 107 via a rotating shaft, the connecting rod 109 can rotate around the rotating shaft. When the pushing block 106 slides to the left, the second connecting cylinder 113 thereon slides to the left and drives the connecting rod 109 to rotate. The rotation of the connecting rod 109 drives the locking block 1031 to slide in the direction of the return spring 1032, so that the locking block 1031 is disengaged from the locking groove 102, thereby completing the removal of the filter 9.

[0075] When installing the filter screen 9, push the push block 106 to the left. Since the middle position of the connecting rod 109 is movably installed in the movable chamber 107 through the rotating shaft, the connecting rod 109 can rotate around the rotating shaft. When the push block 106 slides to the left, the second connecting cylinder 113 on it slides to the left and drives the connecting rod 109 to rotate. The rotation of the connecting rod 109 drives the locking block 1031 to slide in the direction of the return spring 1032 and compress the return spring 1032. At this time, the locking block 1031 does not extend into the inner part of the pressure reducing valve seat 1 The filter screen 9 can be inserted into the inner cavity of the pressure reducing valve seat 1. When the outer edge of the filter screen 9 fits against the end face of the pressure reducing valve seat 1 away from the pressure reducing valve body 2, the push block 106 is released. Under the action of the reset spring 1032, the locking block 1031 is re-inserted into the locking groove 102 to achieve installation, thereby realizing rapid installation and disassembly of the filter screen 9, making it convenient for operators to clean or replace the filter screen 9, and avoiding impurities from following the fluid into the pressure reducing valve, causing the pressure reducing valve to malfunction.

[0076] Example 2:

[0077] like Figures 4 to 6 As shown, in this embodiment, in addition to the structural features of the aforementioned embodiments, it also includes a rotating chamber 121, which is arranged in the pressure-reducing valve body 2 and is communicated with the inner chamber of the pressure-reducing valve body 2; a movable block 122, which is slidably installed in the inner chamber of the pressure-reducing valve body 2, and a tooth groove 123 is provided on the side of the movable block 122 facing the rotating chamber 121; a fixing member 124, which is used to lock the movable block 122 in the current position; and a rotating member 125, which is used to release the locking state of the movable block 122 and can adjust the position of the movable block 122 in the inner chamber of the pressure-reducing valve body 2.

[0078] Furthermore, the fixing member 124 includes a fixed block 1241, which is slidably installed in the rotating cavity 121, and a tooth block is provided at one end of the fixed block 1241 facing the movable block 122; a spring 1242, one end of which is fixedly connected to the fixed block 1241, and the other end is fixedly connected to the inner wall of the rotating cavity 121; wherein, the fixed block 1241 is meshedly connected with the movable block 122.

[0079] Furthermore, the rotating member 125 includes a rotating shaft 1251, which is slidably installed in the rotating chamber 121, and the top end of the rotating shaft 1251 extends out of the pressure reducing valve body 2; a gear 1252, which is fixedly connected to the bottom end of the rotating shaft 1251; and a rotating block 1253, which is fixedly connected to the top end of the rotating shaft 1251; wherein, the bottom surface of the gear 1252 is in contact with the top surface of the fixed block 1241, and a pressable space is left between the rotating block 1253 and the pressure reducing valve body 2.

[0080] Furthermore, the rotating member 1255 also includes a sliding groove 1254, which is arranged in the pressure reducing valve body 2 and is connected to the rotating chamber 121; a sliding block 1255, which is fixedly connected to the rotating shaft 1251 and can slide up and down in the sliding groove 125; wherein the cross-sections of the sliding groove 125 and the sliding block 126 are both circular.

[0081] Furthermore, it also includes an indicator mark 126, which is set on the outer side wall of the rotating block 1253; and an indicator scale 127, which is set on the outer side wall of the pressure reducing valve body 2.

[0082] In this embodiment of the present application, due to the adoption of the above-mentioned structure, in a normal state, the fixed block 1241 is meshedly connected with the tooth groove 123. Since the cross-section of the rotating cavity 121 is a square with a side length greater than the diameter of the gear 1252, the fixed block 1241 is slidably installed in the rotating cavity 121. The fixed block 1241 can only slide up and down in the rotating cavity 121, thereby fixing the position of the movable block 122.

[0083] The cross-sections of the sliding groove 1254 and the sliding block 1255 are both circular, which will not affect the subsequent rotation;

[0084] When the position of the movable block 122 needs to be adjusted, the rotating block 1253 is pressed, so that the rotating shaft 1251, the gear 1252, the sliding block 1255 and the fixed block 1241 slide downward, and the spring 1242 is compressed until the bottom surface of the sliding block 1255 abuts against the sliding groove 1254. At this time, the fixed block 1241 is separated from the tooth groove 123, and the gear 1252 is meshed with the tooth groove 123. By rotating the rotating block 1253, the rotating block 1253 rotates with the rotating shaft 1251, the sliding block 1255 and the gear 1252. The rotation of the gear 1252 drives the movable block 122 to move in the pressure reducing valve. The movable block 122 is fixed to the workpiece 126 by means of the spring 1242. The movable block 122 is engaged with the tooth groove 123 and the gear 1252 is separated from the tooth groove 123, thereby achieving the purpose of fixing the position of the movable block 122.

[0085] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0086] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A pressure reducing valve, comprising a pressure reducing valve seat (1), a pressure reducing valve body (2), a liquid inlet (3), a liquid outlet (4), a pressure reducing valve actuator (5), a pressure reducing valve return spring (6), an exhaust hole (7), and a one-way sealing ring (8), characterized in that: Also includes: A filter screen (9) mounted at the liquid inlet (3) via a detachable mounting structure (10); A ring filter (11) is fixedly mounted at the liquid outlet (4).

2. The pressure reducing valve according to claim 1, characterized in that The detachable mounting structure (10) comprises: A mounting cavity (101) disposed within the pressure reducing valve seat (1); A locking groove (102) provided on the outer side of the filter screen (9); A locking member (103) is used to be inserted into the locking groove (102) to lock the filter screen (9) at the liquid inlet (3); An unlocking member (104) is used to disengage the locking member (103) from the locking groove (102) to release the locked state of the filter screen (9).

3. The pressure reducing valve according to claim 2, characterized in that The locking member (103) comprises: A locking block (1031) is slidably mounted in the mounting cavity (101) and inserted into the locking groove (102); A return spring (1032) has one end fixedly connected to the locking block (1031) and the other end fixedly connected to the inner wall of the installation cavity (101).

4. The pressure reducing valve according to claim 3, characterized in that The unlocking member (104) comprises: A pushing groove (105) is provided on the outer side surface of the pressure reducing valve seat (1); A pushing block (106) is slidably mounted in the pushing groove (105); A movable cavity (107) is provided in the pressure reducing valve seat (1) and is in communication with the mounting cavity (101) and the pushing groove (105); A connecting piece (108) is used for cooperative transmission between the locking block (1031) and the pushing block (106).

5. The pressure reducing valve according to claim 4, characterized in that The connecting member (108) includes: A connecting rod (109) is movably mounted in the movable cavity (107) via a rotating shaft, wherein one end of the connecting rod (109) is provided with a first connecting circular groove (110), and the other end is provided with a second connecting circular groove (111); A No. 1 connecting cylinder (112), which is arranged on the locking block (1031) and is slidably mounted in the No. 1 connecting circular groove (110); The second connecting cylinder (113) is arranged on the pushing block (106) and is slidably mounted in the second connecting circular groove (111).

6. The pressure reducing valve according to claim 1, characterized in that Also includes: a rotating chamber (121), which is arranged in the pressure reducing valve body (2) and communicates with the inner chamber of the pressure reducing valve body (2); a movable block (122) slidably mounted in the inner cavity of the pressure reducing valve body (2), wherein a tooth groove (123) is provided on a side of the movable block (122) facing the rotating cavity (121); a fixing member (124) for locking the movable block (122) in a current position; The rotating member (125) is used to release the locking state of the movable block (122) and to adjust the position of the movable block (122) in the inner cavity of the pressure reducing valve body (2).

7. The pressure reducing valve according to claim 6, characterized in that The fixing member (124) includes: A fixed block (1241) is slidably mounted in the rotating cavity (121), and a tooth block is provided at one end of the fixed block (1241) facing the movable block (122); a spring (1242), one end of which is fixedly connected to the fixed block (1241), and the other end of which is fixedly connected to the inner wall of the rotating chamber (121); The fixed block (1241) is meshedly connected with the movable block (122).

8. The pressure reducing valve according to claim 7, characterized in that The rotating member (125) comprises: a rotating shaft (1251) slidably mounted in the rotating chamber (121), wherein the top end of the rotating shaft (1251) extends out of the pressure reducing valve body (2); a gear (1252) fixedly connected to the bottom end of the rotating shaft (1251); A rotating block (1253) fixedly connected to the top end of the rotating shaft (1251); The bottom surface of the gear (1252) is in contact with the top surface of the fixed block (1241), and a pressable space is left between the rotating block (1253) and the pressure reducing valve body (2).

9. The pressure reducing valve according to claim 8, characterized in that The rotating member (125) further includes: a sliding groove (1254) disposed in the pressure reducing valve body (2) and communicating with the rotating chamber (121); a sliding block (1255) fixedly connected to the rotating shaft (1251) and capable of sliding up and down in the sliding groove (1254); Wherein, the cross sections of the sliding groove (1254) and the sliding block (1255) are both circular.

10. The pressure reducing valve according to claim 8, characterized in that Also includes: an indicator mark (126) disposed on the outer side wall of the rotating block (1253); An indicating scale (127) is provided on the outer side wall of the pressure reducing valve body (2).

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