Pressure reducing valve

Abstract

The pressure reducing valve comprises a valve body, a valve hole is formed in the valve body, a shell is arranged at the upper end of the valve body, a valve rod is arranged in the shell, the lower end of the valve rod is arranged at the valve hole, a communicating hole, a temporary storage cavity and an internal thread cavity are sequentially formed in the valve rod from bottom to top, the inner diameter of the communicating hole is smaller than that of the temporary storage cavity and that of the internal thread cavity, and a piston is arranged at the upper end of the valve rod. A hollow screw penetrates through the piston to be connected with the internal thread cavity, a vertical limiting rod is arranged at the threaded connection position of the screw and the internal thread cavity, a pressure reduction cavity is formed in the upper side of the piston, a reset spring is arranged on the lower side of the piston, a gap and an annular groove are formed in the outer side wall of the piston, the gap is located in the upper side of the annular groove, and the annular groove is communicated with the pressure reduction cavity through the gap. And a V-shaped sealing ring with an upward opening is arranged in the annular groove. According to the utility model, the clearance is matched with the V-shaped sealing ring, so that the sealing performance of the pressure-reducing cavity is ensured; and through arrangement of a limiting rod and a temporary storage cavity, the screws are prevented from loosening.

Description

Technical Field

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

[0002] The pressure reducing valve is mainly used to adjust the outlet pressure so that the outlet pressure can be automatically kept stable. Existing pressure reducing valves such as patent document CN 117628235 A disclose a piston direct-acting high-temperature and high-pressure pressure reducing valve, which adjusts the opening size between the valve core and the valve seat by the piston to achieve dynamic regulation of the pressure of the inlet and outlet channels. During use, the following problems are prone to occur: 1. The piston and the housing are sealed by an O-ring. As the piston moves up and down, the O-ring is prone to wear, resulting in poor sealing; 2. The high-pressure medium impacts the pressure screw, which is easy to cause the pressure screw to loosen, affecting the opening distance between the valve core and the valve seat, and thus affecting the regulation of the outlet pressure. Utility Model Content

[0003] The utility model provides a pressure reducing valve, which ensures the sealing of a pressure reducing chamber by cooperating with a gap and a V-shaped sealing ring, and prevents screws from loosening by arranging a limiting rod and a temporary storage chamber.

[0004] The technical solution of the utility model is achieved as follows: a pressure reducing valve comprises a valve body, a valve hole is arranged in the valve body, a shell is arranged at the upper end of the valve body, a valve stem is arranged in the shell, the lower end of the valve stem is placed at the valve hole, a connecting hole, a temporary storage cavity and an internal thread cavity are arranged in the valve stem from bottom to top, the inner diameter of the connecting hole is smaller than the temporary storage cavity and the internal thread cavity, a piston is arranged at the upper end of the valve stem, a hollow screw passes through the piston and is connected to the internal thread cavity, a vertical limiting rod is arranged at the thread connection between the screw and the internal thread cavity, a pressure reducing cavity is arranged on the upper side of the piston, a reset spring is arranged on the lower side of the piston, a gap and an annular groove are arranged on the outer side wall of the piston, the gap is located on the upper side of the annular groove, the annular groove is communicated with the pressure reducing cavity through the gap, and a V-shaped sealing ring with an opening facing upward is arranged in the annular groove.

[0005] Furthermore, a spacer block is fixed at the lower end of the plug, the lower end of the spacer block abuts against the piston, and the upper end of the screw is spaced from the plug.

[0006] Furthermore, an inlet is provided at one end of the valve body and an outlet is provided at the other end. The outlet is located at the lower side of the inlet, the valve hole is located between the inlet and the outlet, the lower end of the valve stem is placed in the inlet, and a hollow connecting rod is also provided at the lower end of the valve stem. The connecting rod passes through the valve hole and is placed in the outlet.

[0007] Furthermore, a plurality of vertical strip-shaped through holes are provided on the housing below the piston. The strip-shaped through holes can be used for heat dissipation and can also be used for exhausting the lower side of the piston to reduce the resistance of the piston moving downward.

[0008] Furthermore, the outer diameter of the connecting rod is smaller than the valve stem and the valve hole, and the lower end of the connecting rod is spaced apart from the inner bottom wall of the outlet, and the spacing distance is greater than the downward movement distance of the valve stem. That is, when the valve stem moves downward to close the valve hole, there is still a gap between the connecting rod and the inner bottom wall of the outlet.

[0009] Furthermore, an adjusting gasket is provided at the lower end of the return spring.

[0010] Beneficial effects of the utility model:

[0011] The pressure reducing valve of the utility model cooperates with the gap and the V-shaped sealing ring, and the medium in the pressure reducing chamber enters the V-shaped sealing ring through the gap and squeezes the V-shaped sealing ring to expand outward, so that the V-shaped sealing ring and the inner wall of the shell are sealed against each other. Even if the V-shaped sealing ring is worn during use, the sealing of the pressure reducing chamber can also be ensured due to the squeezing of the V-shaped sealing ring by the medium.

[0012] The pressure reducing valve of the utility model limits the circumferential rotation of the screw by setting the limit rod, thereby preventing the screw from loosening due to the impact of the medium. At the same time, the impact of the medium on the screw is also alleviated by setting the temporary storage cavity.

[0013] After the medium of the pressure reducing valve of the utility model enters the pressure reducing chamber, the piston drives the valve stem to move downward, thereby reducing the distance between the valve stem and the valve hole, reducing the gas entering the outlet, and keeping the pressure at the outlet stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the external structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0017] Figure 3 for Figure 2 A partial enlarged view of middle A.

[0018] Valve body 1, inlet 2, outlet 3, valve hole 4, shell 5, valve stem 6, connecting rod 7, connecting hole 8, temporary storage chamber 9, internal thread chamber 10, piston 11, screw 12, shaft hole 13, plug 14, decompression chamber 15, return spring 16, strip through hole 17, adjustment gasket 18, gap 19, annular groove 20, V-shaped sealing ring 21, limit rod 22, spacer block 23. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] like Figure 1 and 2 As shown, a pressure reducing valve comprises a valve body 1, one end of the valve body 1 is provided with an inlet 2, and the other end is provided with an outlet 3, the outlet 3 is located at the lower side of the inlet 2, a vertical valve hole 4 is provided between the inlet 2 and the outlet 3, and the inlet 2 and the outlet 3 are communicated through the valve hole 4.

[0021] A vertical shell 5 is screwed to the upper end of the valve body 1. A vertical sliding valve stem 6 is arranged in the shell 5. The lower end of the valve stem 6 is placed in the inlet 2. The lower end of the valve stem 6 matches the valve hole 4. As the valve stem 6 moves vertically, the valve hole 4 is opened and closed.

[0022] A hollow connecting rod 7 is also provided at the lower end of the valve stem 6. The valve stem 6 and the connecting rod 7 are coaxial integrated structures. The connecting rod 7 passes through the valve hole 4 and is placed in the outlet 3. The outer diameter of the connecting rod 7 is smaller than the valve stem 6 and the valve hole 4. The lower end of the connecting rod 7 is spaced apart from the inner bottom wall of the outlet 3, and the spacing distance is greater than the maximum downward movement distance of the valve stem 6, that is, after the valve stem 6 moves downward to close the valve hole 4, the lower end of the connecting rod 7 does not collide with the inner bottom wall of the outlet 3, and the connecting rod 7 does not affect the downward movement of the valve stem 6.

[0023] A connecting hole 8 is provided in the valve stem 6, and a temporary storage cavity 9 and an internal thread cavity 10 are provided at the upper end of the connecting hole 8 in sequence. The inner diameter of the connecting hole 8 is smaller than that of the temporary storage cavity 9 and the internal thread cavity 10. A piston 11 is mounted on the upper end of the valve stem 6. A hollow screw 12 passes through the piston 11 and is connected to the internal thread cavity 10. The piston 11 is fixed to the valve stem 6 by the screw 12. There is an axial hole 13 in the screw 12, and the temporary storage cavity 9 is connected to the axial hole 13. A vertical limiting rod 22 is embedded in the threaded joint of the screw 12 and the internal thread cavity 10. The upper end of the limiting rod 22 passes through the pressure head of the screw 12, and the lower end extends into the threaded joint of the screw 12 and the internal thread cavity 10. The circumferential rotation of the screw 12 is limited by the setting of the vertical limiting rod 12.

[0024] A plug 14 is screwed to the upper end of the housing 5, and a spacer block 23 is provided between the plug 14 and the piston 11. The spacer block 23 is fixedly connected to the plug 14, and the upper end of the spacer block 23 is higher than the upper end of the screw 12, so that a decompression chamber 15 is formed between the piston 11 and the plug 14, and the decompression chamber 15 is communicated with the temporary storage chamber 9 through the axial hole 13.

[0025] A return spring 16 is provided in the housing 5 at the lower end of the piston 11 , and a plurality of vertical strip through holes 17 are provided on the housing 5 below the piston 11 . An adjusting gasket 18 is installed in the housing 5 at the lower end of the return spring 16 , and the force of the return spring 16 is adjusted by adjusting the gasket 18 .

[0026] like Figure 3 As shown, a gap 19 and an annular groove 20 are provided on the outer wall of the piston 11, the gap 19 is located on the upper side of the annular groove 20, the annular groove 20 is connected with the decompression chamber 15 through the gap 19, and a V-shaped sealing ring 21 with an upward opening is provided in the annular groove 20. The medium in the decompression chamber 15 enters the V-shaped sealing ring 21 through the gap 19, and squeezes the V-shaped sealing ring 21 to expand outward, so that the inner side thereof is sealed against the annular groove 20, and the outer side is sealed against the inner wall of the housing 5, thereby ensuring the sealing of the decompression chamber 15.

[0027] The method of using the pressure reducing valve is as follows: under the action of the reset spring 16, the valve hole 4 is in a normally open state. If the pressure at the outlet 3 is relatively high, the medium entering the outlet 3 enters the pressure reducing chamber 15 through the connecting rod 7, the connecting hole 8, the temporary storage chamber 9, and the shaft hole 13, and pushes the screw 12, the piston 11, and the valve stem 6 to move downward. The reset spring 16 is compressed, and the distance between the valve stem 6 and the valve hole 4 is reduced. When the medium passes through the valve stem 6, the heat is dissipated and the temperature is reduced through the strip through hole 17. The strip through hole 17 can also be used to exhaust the housing 5 on the lower side of the piston 11 to keep it consistent with the external pressure.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressure reducing valve, comprising a valve body, a valve hole is arranged in the valve body, a housing is arranged at the upper end of the valve body, a valve stem is arranged in the housing, and the lower end of the valve stem is placed at the valve hole, characterized in that: A connecting hole, a temporary storage cavity and an internal thread cavity are provided in the valve stem from bottom to top. The inner diameter of the connecting hole is smaller than that of the temporary storage cavity and the internal thread cavity. A piston is provided at the upper end of the valve stem. A hollow screw passes through the piston and is connected to the internal thread cavity. A vertical limit rod is provided at the connection between the screw and the thread of the internal thread cavity. A decompression cavity is provided on the upper side of the piston, and a return spring is provided on the lower side of the piston. A gap and an annular groove are provided on the outer side wall of the piston. The gap is located on the upper side of the annular groove, and the annular groove is connected with the decompression cavity through the gap. A V-shaped sealing ring with an opening facing upward is provided in the annular groove.

2. A pressure reducing valve according to claim 1, characterized in that: The upper end of the shell is screwed with a plug, the lower end of the plug is fixed with a spacer block, the lower end of the spacer block abuts against the piston, and the upper end of the screw is spaced from the plug.

3. A pressure reducing valve according to claim 1 or 2, characterized in that: One end of the valve body is provided with an inlet, and the other end is provided with an outlet, the outlet is located at the lower side of the inlet, the valve hole is located between the inlet and the outlet, the lower end of the valve stem is placed in the inlet, and the lower end of the valve stem is also provided with a hollow connecting rod, the connecting rod passes through the valve hole and is placed in the outlet.

4. A pressure reducing valve according to claim 1 or 2, characterized in that: A plurality of vertical strip-shaped through holes are arranged on the shell below the piston.

5. A pressure reducing valve according to claim 3, characterized in that: The outer diameter of the connecting rod is smaller than the valve stem and the valve hole, the lower end of the connecting rod is spaced from the inner bottom wall of the outlet, and the spacing distance is greater than the downward movement distance of the valve stem.

6. A pressure reducing valve according to claim 1, characterized in that: An adjusting gasket is arranged at the lower end of the return spring.

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