Piston type pressure reducing valve

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a piston type pressure reducing valve which comprises a valve body, a valve cover and a spring cover which are sequentially connected from bottom to top, the valve body comprises a flow inlet cavity, a flow outlet cavity and a piston cylinder sleeve located above the flow outlet cavity, and a mounting groove is formed in the position, at an inlet of a lower cavity, in the valve cover. A filter is installed in the installation groove, a medium flow channel communicated with the flow inlet cavity and the flow outlet cavity is arranged in the valve body, a main valve seat is arranged in the medium flow channel, a valve rod is arranged in the main valve seat in a penetrating mode, and the bottom end of the valve rod is connected with a main valve clack which achieves plane sealing with the main valve seat. The filter is installed in the installation groove of the valve cover, the filter protection function is achieved, impurities can be prevented from entering the piston cavity to clamp the piston and cause failure of the pressure reducing valve, the installation position of the filter is reasonable, and the disassembly, assembly and replacement efficiency can be improved. A conventional chamfer sealing structure of the main valve clack is changed into a plane sealing structure, plane sealing of the main valve clack and the main valve seat is achieved, and the abrasion resistance of the main valve clack is improved.

Description

Technical Field

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

[0002] The pilot-operated piston-type gas pressure reducing valve consists of a main valve and a pilot valve. The main valve is primarily composed of the valve seat, main valve disc, piston, cylinder sleeve, and spring. The pilot valve is primarily composed of the valve seat, valve disc, diaphragm, spring, and adjustment spring. The outlet pressure is set by adjusting the adjustment spring pressure, and the diaphragm senses outlet pressure changes. The pilot valve opens and closes, driving the piston to adjust the flow area of ​​the main valve's throttling section, achieving pressure reduction and stabilization.

[0003] In the prior art, Chinese patent publication number CN207989841U discloses a pilot piston pressure reducing valve, which includes a valve body and a piston disposed in the valve body. Due to impurities in the medium, the impurities will accumulate on the piston during long-term use of the pressure reducing valve, causing the piston to be stuck and causing the pressure reducing valve to malfunction.

[0004] In addition, since the main valve disc adopts a chamfered structure, a chamfered seal is achieved between the main valve seat and the valve when the valve stem is driven; during long-term use, the wear between the main valve disc and the main valve seat of the chamfered structure can easily cause the sealing effect between the main valve disc and the main valve seat to decrease, and lose the sealing function. Summary of the Invention

[0005] To solve the problems raised in the above background technology. The utility model provides a piston-type pressure reducing valve, in which a filter is installed in the installation groove at the entrance of the lower chamber inside the valve cover, which has a filtering protection function and can prevent impurities from entering the piston chamber and jamming the piston, causing the pressure reducing valve to malfunction. The filter is installed in a reasonable position, which can improve the efficiency of disassembly and replacement. The filter can be disassembled, replaced and cleaned by opening the plug without disassembling the pressure reducing valve. The main valve disc changes the conventional chamfered sealing structure to a flat sealing structure design, realizing a flat seal with the main valve seat, and increasing the flat wear resistance of the main valve disc.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a piston-type pressure reducing valve, comprising a valve body, a valve cover and a spring cover connected in sequence from bottom to top, the valve body comprising an inlet chamber, an outlet chamber and a piston cylinder sleeve located above the outlet chamber, a pilot valve chamber is provided in the valve cover and the spring cover, a pilot valve is provided in the pilot valve chamber, the pilot valve comprises a pilot valve seat and a pilot valve disc, the pilot valve chamber is divided into an upper chamber and a lower chamber by the pilot valve seat, an installation groove is provided at the entrance of the lower chamber inside the valve cover, a filter is installed in the installation groove, a medium flow channel connecting the inlet chamber and the outlet chamber is provided inside the valve body, a main valve seat is provided in the medium flow channel, a valve stem is passed through the main valve seat, the bottom end of the valve stem is connected to a main valve disc that realizes a planar seal with the main valve seat, and the top surface of the main valve disc adopts a planar sealing layer structure design.

[0007] As a preferred solution, the planar sealing layer structure on the top of the main valve disc is sealed against the bottom of the main valve seat, a main valve disc spring is provided between the bottom of the main valve disc and the bottom cover provided under the valve body, an elastic protective pad is provided between the inner wall of the valve body and the main valve seat at the medium flow channel; a sealing gasket is provided between the valve body and the bottom cover.

[0008] As a preferred solution, the valve cover is provided with a plug for sealing the installation groove, and the lower chamber is connected to the inlet chamber through a filter via a first flow channel on the valve body.

[0009] As a preferred embodiment, a pilot valve flow channel is provided in the pilot valve seat, and the pilot valve flap includes a first sealing portion located in the pilot valve flow channel and a second sealing portion located below the pilot valve flow channel. A sealing filter ring is provided on the outer periphery of the second sealing portion and abuts against the inner wall of the lower chamber.

[0010] As a preferred solution, a piston is provided in the piston cavity of the piston cylinder sleeve, and the upper end of the valve stem penetrates into the piston cylinder sleeve and is connected to the piston; an annular groove is provided on the circumferential outer wall of the piston, and a piston sealing ring is provided in the annular groove to abut against the piston cylinder sleeve.

[0011] As a preferred solution, the interior of the upper chamber is divided into an upper installation chamber and a lower balance chamber by a diaphragm. The installation chamber is provided with a spring upper pad and a spring lower pad connected to each other by an adjusting spring. The top of the spring upper pad is connected with an adjusting screw extending to the top of the spring cover.

[0012] As a preferred solution, a second flow channel is provided between the lower chamber and the piston chamber, and a third flow channel is provided between the outlet chamber and the upper chamber.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The utility model discloses a valve cover is provided with an installation groove at the entrance of the lower chamber, and a filter is installed in the installation groove, which has a filtering protection function and can prevent impurities from entering the piston cavity of the piston cylinder sleeve and getting the piston stuck, causing the pressure reducing valve to malfunction. Moreover, the filter is reasonably installed in the position of the valve cover, which can improve the efficiency of disassembly and replacement. The filter can be disassembled, replaced and cleaned by opening the plug without disassembling the pressure reducing valve, and can also be installed last after the pressure reducing valve is assembled.

[0015] The main valve disc changes the conventional chamfered sealing structure to a flat sealing structure design. The flat sealing layer structure on the top of the main valve disc fits and seals with the bottom of the main valve seat; thereby achieving a flat seal between the main valve disc and the main valve seat, increasing the flat wear resistance of the main valve disc; and avoiding the problem of reduced sealing effect between the main valve disc and the main valve seat caused by wear between the main valve disc and the main valve seat due to the chamfered structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the connection between the main valve disc, the main valve seat and the bottom cover in the utility model;

[0018] Figure 3 For this utility model Figure 1 Schematic diagram of the structure enlarged at point A in the middle.

[0019] Description of Figure Numbers:

[0020] 1. Valve body; 1a. Inlet chamber; 1b. Outlet chamber; 11. Piston and cylinder sleeve; 12. First flow channel; 13. Piston chamber; 14. Piston; 15. Piston sealing ring;

[0021] 2. Main valve seat; 21. Medium flow channel;

[0022] 3. Main valve disc; 4. Valve stem;

[0023] 5. Bottom cover; 51. Main valve disc spring; 52. Sealing gasket;

[0024] 6. Valve cover; 61. Plug; 62. Filter; 63. Lower chamber; 64. Third flow channel; 65. Pilot valve chamber; 66. Second flow channel; 67. Diaphragm;

[0025] 7. Spring cover; 71. Adjusting screw; 72. Spring upper pad; 73. Adjusting spring; 74. Upper chamber; 75. Spring lower pad;

[0026] 8. Pilot valve; 81. Pilot valve seat; 82. Pilot valve disc; 83. Sealing filter ring; 84. First sealing part; 85. Pilot valve flow channel; 86. Balance chamber; 87. Second sealing part. DETAILED DESCRIPTION

[0027] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0028] Example 1

[0029] See also Figure 1-3 The utility model provides the following technical solutions: a piston-type pressure reducing valve, comprising a valve body 1, a valve cover 6 and a spring cover 7 connected in sequence from bottom to top, the valve body 1 comprising an inlet chamber 1a, an outlet chamber 1b and a piston cylinder sleeve 11 located above the outlet chamber 1b, a pilot valve chamber 65 is provided in the valve cover 6 and the spring cover 7, a pilot valve 8 is provided in the pilot valve chamber 65, the pilot valve 8 comprises a pilot valve seat 81 and a pilot valve flap 82, the pilot valve chamber 65 is divided into an upper chamber 74 and a lower chamber 63 by the pilot valve seat 81, an installation groove is provided at the entrance of the lower chamber 63 inside the valve cover 6, a filter 62 is installed in the installation groove, which has a filtering protection function, can prevent impurities from entering the piston chamber 13 of the piston cylinder sleeve 11 and jamming the piston, causing the pressure reducing valve to malfunction, and the filter 62 is reasonably installed in the valve cover 6, which can improve disassembly and replacement The valve body 1 is provided with a medium flow channel 21 connecting the inlet chamber 1a and the outlet chamber 1b, and a main valve seat 2 is provided in the medium flow channel 21. A valve stem 4 is passed through the main valve seat 2, and the bottom end of the valve stem 4 is connected with a main valve disc 3 which realizes a planar seal with the main valve seat 2; the top surface of the main valve disc 3 adopts a planar sealing layer structure design, and the planar sealing layer structure on the top of the main valve disc 3 fits and seals with the bottom of the main valve seat 2; a main valve disc spring 51 is provided between the bottom of the main valve disc 3 and the bottom cover 5 provided under the valve body 1, and an elastic protection pad is provided between the inner wall of the valve body 1 and the main valve seat 2 at the medium flow channel 21; the elastic protection pad can reduce the damage to the valve body 1 caused by the shaking of the main valve disc 3 due to the impact of the medium, and at the same time form an elastic seal between the main valve disc 3 and the main valve seat 2 to improve the sealing effect; a sealing gasket 52 is provided between the valve body 1 and the bottom cover 5.

[0030] In this embodiment, the valve cover 6 is provided with a plug 61 for sealing the installation groove, and the lower chamber 63 is connected to the inlet chamber 1a through the first flow channel 12 on the valve body 1 through the filter 62; the installation groove is opened by the plug 61, and the filter 62 is disassembled and assembled, which can be installed last after the pressure reducing valve is assembled, and the pressure reducing valve does not need to be disassembled when replaced or cleaned.

[0031] In this embodiment, a pilot valve flow channel 85 is provided in the pilot valve seat 81, and the pilot valve flap 82 includes a first sealing portion 84 located in the pilot valve flow channel 85 and a second sealing portion 87 located below the pilot valve flow channel 85. A sealing filter ring 83 is provided on the outer periphery of the second sealing portion 87, which abuts against the inner wall of the lower chamber 63; the interior of the upper chamber 74 is divided into an upper installation chamber and a lower balance chamber 86 by a diaphragm 67, and a spring upper pad 72 and a spring lower pad 75 connected to each other by an adjusting spring 73 are provided in the installation chamber, and an adjusting screw 71 extending to the top of the spring cover 7 is connected to the top of the spring upper pad 72; the operating principle of the pilot piston type pressure reducing valve is well known to those skilled in the art and will not be described in detail here.

[0032] In this embodiment, a piston 14 is provided in the piston cavity 13 of the piston cylinder sleeve 11, and the upper end of the valve stem 4 penetrates into the interior of the piston cylinder sleeve 11 and is connected to the piston 14; an annular groove is provided on the circumferential outer wall of the piston 14, and a piston sealing ring 15 is provided in the annular groove to abut against the piston cylinder sleeve 11; it is ensured that the piston cavity 13 inside the piston cylinder sleeve 11 will not be infiltrated, and the normal operation of the piston 14 is ensured; the piston cylinder sleeve 11 can reduce the wear on the piston cavity 13.

[0033] In this embodiment, a second flow channel 66 is provided between the lower chamber 63 and the piston chamber 13 , and a third flow channel 64 is provided between the outlet chamber 1 b and the upper chamber 74 .

[0034] The working principle and use process of the present invention: When the present invention is in use, the staff will open the installation slot through the plug 61 to disassemble and assemble the filter 62. It can also be installed last after the pressure reducing valve is assembled. Moreover, when replacing or cleaning, there is no need to disassemble the pressure reducing valve, and the operation can be carried out by just opening the plug 61. A mounting slot is provided at the entrance of the lower chamber inside the valve cover 6, and a filter 62 is installed in the mounting slot. The filter 62 has a filtering protection function, which can prevent impurities from entering the piston cavity 13 of the piston cylinder sleeve 11 and jamming the piston 14, causing the pressure reducing valve to malfunction. In addition, the filter 62 is installed in a reasonable position on the valve cover, which can improve the efficiency of disassembly and replacement.

[0035] The main valve disc 3 changes the conventional chamfered sealing structure into a flat sealing structure design. The flat sealing layer structure on the top of the main valve disc 3 fits and seals with the bottom of the main valve seat 2; thereby achieving a flat seal between the main valve disc 3 and the main valve seat 2, and increasing the flat wear resistance of the main valve disc 3; avoiding the problem of reduced sealing effect between the main valve disc and the main valve seat caused by wear between the main valve disc and the main valve seat due to the chamfered structure.

[0036] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A piston-type pressure reducing valve, comprising a valve body (1), a valve cover (6) and a spring cover (7) connected in sequence from bottom to top, wherein the valve body (1) comprises an inlet chamber (1a), an outlet chamber (1b) and a piston cylinder sleeve (11) located above the outlet chamber (1b), a pilot valve chamber (65) is provided in the valve cover (6) and the spring cover (7), a pilot valve (8) is provided in the pilot valve chamber (65), the pilot valve (8) comprises a pilot valve seat (81) and a pilot valve flap (82), the pilot valve chamber (65) is divided into an upper chamber (74) and a lower chamber (63) by the pilot valve seat (81), and is characterized in that: The valve cover (6) is provided with an installation groove at the entrance of the lower chamber (63), and a filter (62) is installed in the installation groove. The valve body (1) is provided with a medium flow channel (21) connecting the inlet chamber (1a) and the outlet chamber (1b). A main valve seat (2) is provided in the medium flow channel (21). A valve stem (4) is provided in the main valve seat (2). The bottom end of the valve stem (4) is connected to a main valve flap (3) for realizing a planar seal with the main valve seat (2). The top surface of the main valve flap (3) adopts a planar sealing layer structure design.

2. The piston-type pressure reducing valve according to claim 1, characterized in that: The planar sealing layer structure on the top of the main valve disc (3) is sealed against the bottom of the main valve seat (2); a main valve disc spring (51) is provided between the bottom of the main valve disc (3) and a bottom cover (5) provided below the valve body (1); an elastic protective pad is provided between the inner wall of the valve body (1) and the main valve seat (2) at the medium flow channel (21); and a sealing gasket (52) is provided between the valve body (1) and the bottom cover (5).

3. The piston-type pressure reducing valve according to claim 1, characterized in that: The valve cover (6) is provided with a plug (61) for sealing the mounting groove, and the lower chamber (63) is connected to the inlet chamber (1a) through the filter (62) and the first flow channel (12) on the valve body (1).

4. The piston-type pressure reducing valve according to claim 1, characterized in that: A pilot valve flow channel (85) is provided in the pilot valve seat (81), and the pilot valve flap (82) includes a first sealing portion (84) located in the pilot valve flow channel (85) and a second sealing portion (87) located below the pilot valve flow channel (85). A sealing filter ring (83) is provided on the outer periphery of the second sealing portion (87) and is in contact with the inner wall of the lower chamber (63).

5. The piston-type pressure reducing valve according to claim 1, characterized in that: A piston (14) is provided in the piston cavity (13) of the piston cylinder sleeve (11), and the upper end of the valve stem (4) penetrates into the interior of the piston cylinder sleeve (11) and is connected to the piston (14); an annular groove is provided on the circumferential outer wall of the piston (14), and a piston sealing ring (15) is provided in the annular groove and abuts against the piston cylinder sleeve (11).

6. The piston-type pressure reducing valve according to claim 1, characterized in that: The interior of the upper chamber (74) is divided into an upper mounting chamber and a lower balancing chamber (86) by a diaphragm (67). A spring upper pad (72) and a spring lower pad (75) connected to each other by an adjusting spring (73) are provided in the mounting chamber. The top of the spring upper pad (72) is connected to an adjusting screw (71) extending to the top of the spring cover (7).

7. The piston-type pressure reducing valve according to claim 1, characterized in that: A second flow channel (66) is provided between the lower chamber (63) and the piston chamber (13), and a third flow channel (64) is provided between the outlet chamber (1b) and the upper chamber (74).

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