Ultra-low pressure safety valve

Abstract

An ultra-low pressure safety valve comprises a valve body, a valve seat, a valve cover, a valve clack assembly and an elastic assembly, a feeding port is formed in the lower portion of the valve body, a discharging port is formed in the side portion of the valve body, and the valve seat is arranged at the feeding port and connected with the valve body; the valve clack assembly comprises a valve clack and a guide sleeve arranged on the periphery of the valve clack in a sleeving mode, the guide sleeve is fixed between the valve body and the valve deck, and the valve clack can slide relative to the guide sleeve. The upper end of the valve clack extends into the guide sleeve, a cavity is formed in the upper end of the valve clack, the elastic assembly comprises an elastic piece and an elastic piece fixing seat, the lower end of the elastic piece extends into the cavity and is limited between the elastic piece fixing seat and the valve clack, the elastic piece fixing seat is equivalent to positioning of the valve cover, and under the action of fluid, the elastic piece acts on the valve clack to enable the valve clack to be away from or abut against the valve seat. According to the ultra-low pressure safety valve, under the condition that the pressure is lower than a safety threshold value, the ultra-low working condition requirement is met only through the weight of the valve clack and the effect of the light-weight spring, the number of parts is reduced, and the failure rate is reduced.

Description

Technical Field

[0001] The utility model relates to the field of safety valves, in particular to an ultra-low pressure safety valve. Background Art

[0002] An ultra-low-pressure safety valve is a type of safety valve specifically designed for low-pressure systems. It is characterized by its ability to operate at very low pressures while maintaining accurate response and stable discharge pressure. Typically, an ultra-low-pressure safety valve consists of a diaphragm and a spring. When pressure exceeds a set point, the diaphragm is deformed by the pressure, opening the valve and releasing the pressure. Therefore, an ultra-low-pressure safety valve can better meet the requirements of ultra-low operating conditions. It can promptly operate when pressure falls below the safety threshold, ensuring the safety of equipment and production processes.

[0003] Ultra-low-pressure safety valves are widely used in gas transportation, vacuum equipment, and scientific research. Conventional ultra-low-pressure safety valves have a slow response speed and numerous opening and closing components on the valve stem, making them unable to open promptly if a component fails. Therefore, the present utility model proposes an ultra-low-pressure safety valve that, under low pressure conditions, relies solely on the weight of the valve disc and the action of a lightweight spring to meet ultra-low-pressure operating requirements, thereby reducing the number of components and the likelihood of failure. Utility Model Content

[0004] The purpose of the present utility model is to overcome the shortcomings and deficiencies of the prior art and to provide an ultra-low pressure safety valve that meets the ultra-low pressure working requirements by relying solely on the weight of the valve disc itself and the action of a lightweight spring when the pressure is below the safety threshold, thereby solving the problems in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: an ultra-low pressure safety valve, comprising a valve body, a valve seat, a valve cover, a valve disc assembly and an elastic assembly, wherein the valve body is provided with a feed port at the bottom and a discharge port at the side, and the valve seat is arranged at the feed port and connected to the valve body; the valve disc assembly comprises a valve disc and a guide sleeve sleeve arranged on the outer periphery of the valve disc, the guide sleeve is fixed between the valve body and the valve cover, and the valve disc is slidable relative to the guide sleeve; the upper end of the valve disc extends into the interior of the guide sleeve, and a chamber is provided at the upper end of the valve disc, the elastic assembly comprises an elastic member and an elastic member fixing seat, the lower end of the elastic member extends into the chamber and is limited between the fixing seat and the valve disc, the fixing seat is positioned relative to the valve cover, and under the action of the fluid, the elastic member acts on the valve disc to make the valve disc move away from or abut against the valve seat.

[0006] By adopting the above technical solution, the internal structure of the ultra-low pressure safety valve is simple and clear, and on the basis of the conventional spring-type safety valve, the influence of the valve stem, spring seat and the weight of the spring itself on the valve disc sealing surface is eliminated, and the set pressure of the safety valve is adjusted only by the weight of the valve disc itself and the lightweight spring.

[0007] The present invention is further configured such that a limiting groove is provided in the chamber, the elastic component comprises an elastic member and an elastic member fixing seat, and the lower end of the elastic member and the valve flap are limited and matched by the limiting groove.

[0008] By adopting the above technical solution, the lower end of the elastic member is restricted on the valve disc, which is conducive to connecting and cooperating the valve disc and the elastic member. During the valve closing process, the elastic force generated by the elastic member can effectively act on the valve disc.

[0009] The utility model is further configured to include a short rod, a protrusion is provided at the lower end of the short rod, an indented groove is provided at the upper end of the elastic member fixing seat, and the protrusion is fixedly connected in the indented groove.

[0010] By adopting the above technical solution, the elastic member fixing seat and the short rod are fixedly connected by relying on the protrusion and the sunken groove, eliminating the influence of the gravity of the elastic member fixing seat, and relying only on the valve disc's own gravity to meet the ultra-low pressure working condition.

[0011] The utility model is further configured such that the upper end of the short rod is fixedly connected to the valve cap.

[0012] By adopting the above technical solution, the short rod is fixedly connected to the valve cap, which is conducive to the purpose of the utility model of opening the valve at an ultra-low pressure by relying solely on the weight of the valve disc itself.

[0013] The utility model is further configured such that the lower end of the valve seat is connected to the valve body, and the upper end extends into the valve cavity and contacts the valve disc assembly. The valve seat includes an adjustment ring, which is arranged at the upper end of the valve seat and abuts against the lower end of the valve disc.

[0014] By adopting the above technical solution, the adjusting ring can adjust the opening pressure and discharge capacity of the safety valve. By adjusting the position of the adjusting ring, the area and shape of the fluid channel inside the safety valve can be changed, thereby precisely controlling the pressure point at which the safety valve opens under ultra-low pressure conditions.

[0015] The utility model is further configured such that the valve flap is made of a material with relatively low surface roughness.

[0016] By adopting the above technical solutions, good sealing and sensitive opening can be achieved under ultra-low pressure. Lower surface roughness can reduce the risk of medium leakage, improve the sealing effect, and reduce the friction between the valve disc and the valve seat, thereby extending the service life.

[0017] The utility model is further configured such that the lower end surface of the valve disc is provided with an annular groove and a circular groove, the diameter of the circular groove is larger than the diameter of the upper end opening of the valve seat, and the annular groove is provided on the outer ring of the circular groove.

[0018] By adopting the above technical solution, when the valve is closed, the diameter of the circular groove is larger than the diameter of the opening at the upper end of the valve seat, which effectively blocks the medium at the valve seat to prevent leakage; the annular groove is arranged on the outer ring of the circular groove to prevent wear when the adjusting ring contacts the valve disc.

[0019] The utility model is further configured such that the short rod includes an adjusting screw sleeve, the adjusting screw sleeve is arranged on the outer periphery of the short rod and connected to the short rod, and the adjusting screw sleeve is provided with threads and can be threadedly connected to the upper end of the valve cover.

[0020] By adopting the above technical solution, the degree of spring compression can be changed by rotating the adjusting screw. When the adjusting screw is rotated clockwise, the spring is further compressed, thereby increasing the opening pressure of the safety valve; conversely, when the screw is rotated counterclockwise, the degree of spring compression is reduced, thereby reducing the opening pressure of the safety valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still fall within the scope of the present invention.

[0022] Figure 1 This is a structural diagram of an ultra-low pressure safety valve of the utility model;

[0023] Figure 2 for Figure 1 An enlarged schematic diagram of point A in the structure;

[0024] In the figure: 1-valve body;

[0025] 2-valve seat; 20-adjusting ring;

[0026] 3-valve cover;

[0027] 4-valve bonnet;

[0028] 5-valve disc assembly; 50-valve disc; 501-annular groove; 502-circular groove; 51-chamber; 52-limiting groove; 53-guide sleeve;

[0029] 6-elastic component; 60-elastic member; 61-elastic member fixing seat; 610-recessed groove;

[0030] 7-short rod; 70-bump; 71-adjusting screw sleeve. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0032] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two non-identical entities or non-identical parameters with the same name. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. Subsequent embodiments will not explain this one by one.

[0033] The directional and positional terms used in this invention, such as up, down, front, back, left, right, inside, outside, top, bottom, and side, are merely references to the directions or positions in the accompanying drawings. Therefore, the directional and positional terms used are intended to illustrate and facilitate understanding of this invention and are not intended to limit the scope of protection of this invention.

[0034] Example:

[0035] The utility model proposes an ultra-low pressure safety valve, which is widely used in gas transportation, vacuum equipment and scientific research fields. It is mainly used to meet ultra-low working conditions when the pressure is lower than the safety threshold, relying only on the weight of the valve disc itself and the action of a lightweight spring.

[0036] See also Figure 1 and Figure 2 In the embodiment of the present utility model, a feed port is provided below the valve body 1, and a valve seat 2 is provided at the feed port. The lower end of the valve seat 2 is connected to the lower end of the valve body 1, and the upper end extends into the valve cavity and is connected to the valve flap assembly 5. The valve flap assembly 5 includes a valve flap 50 and a guide sleeve 53. The lower end of the valve flap 50 abuts against the upper end of the valve seat 2, and the upper end extends into the guide sleeve 53 and is connected to the elastic component 6. The elastic component 6 includes an elastic member 60 and an elastic member fixing seat 61. As for the type of the elastic member, there is no specific limitation here. Specifically in this embodiment, a lightweight spring is used; The lower end of the elastic member fixing seat 61 is connected and fixed to the upper end of the elastic member 60. The upper end is provided with an inward groove 610, which is connected to the lower end of the short rod 7. The lower end of the short rod 7 is provided with a protrusion 70. The elastic component 6 is restricted to the lower end of the short rod 7 through the tight connection between the protrusion 70 and the inward groove 610. As for the connection method between the protrusion and the inward groove, there is no specific restriction here. It can be a threaded connection or a pin connection, etc. Specifically in this embodiment, a threaded connection is adopted; the upper end of the short rod 7 is fixed to the valve cap 4 by a threaded connection.

[0037] In an embodiment of the present utility model, the valve flap 50 also includes a chamber 51, a limiting groove 52 is provided in the chamber 51, and the lower end of the elastic member 60 is fixed in the limiting groove 52. During the valve opening process, the impact force of the medium on the valve flap 50 is greater than its own gravity, so that it is lifted upward, driving the elastic member 60 to compress; during the valve closing process, the impact force received by the valve flap 50 is less than its own gravity, and under the action of its own gravity and the elastic member, it drops to contact the valve seat, and the valve is closed; the valve flap is made of a material with a lower surface roughness, so that the valve flap and the valve seat can fit more closely and reduce the wear of the valve flap and the valve seat caused by friction between the two.

[0038] In an embodiment of the present utility model, an annular groove 501 and a circular groove 502 are further provided on the lower end surface of the valve disc 50. The annular groove 501 is arranged on the periphery of the circular groove. The diameter of the circular groove 502 is slightly larger than the diameter of the opening of the upper end of the valve seat 2, so that the medium can be completely blocked at the valve seat when the valve is closed to avoid leakage. The valve seat includes an adjusting ring 20, and the annular groove 501 leaves room for movement for the upper end 20 of the adjusting ring to avoid wear caused by contact between the adjusting ring 20 and the lower end of the valve disc 50 during adjustment.

[0039] In an embodiment of the present utility model, the short rod 7 also includes an adjusting screw sleeve 71, which is arranged on the outer periphery of the short rod 7 and is fixedly connected to the short rod 7. The adjusting screw sleeve 71 is provided with a thread and can be threadedly connected to the upper end of the valve cover 3. By rotating the adjusting screw sleeve 71, the positional relationship between the short rod 7 and the elastic component 6 and the valve disc 50 is controlled, thereby changing the preload force of the elastic member 60 and achieving the purpose of changing the opening pressure value of the safety valve.

[0040] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. An ultra-low pressure safety valve, comprising a valve body (1), a valve seat (2), a valve cover (3), a valve disc assembly (5) and an elastic assembly (6), wherein the valve body (1) is provided with a feed inlet at the bottom and a discharge outlet at the side, and the valve seat (2) is arranged at the feed inlet and connected to the valve body (1); the valve disc assembly (5) comprises a valve disc (50) and a guide sleeve (53) sleeved on the outer periphery of the valve disc (50), the guide sleeve (53) is fixed between the valve body (1) and the valve cover (3), and the valve disc (50) is slidable relative to the guide sleeve (53); the upper end of the valve disc (50) extends into the interior of the guide sleeve (53), and the upper end of the valve disc (50) is provided with a chamber (51), and the elastic assembly (6) comprises an elastic member (60) and an elastic member fixing seat (61), characterized in that: The lower end of the elastic member (60) extends into the chamber (51) and is confined between the elastic member fixing seat (61) and the valve flap (50). The elastic member fixing seat (61) is positioned relative to the valve cover (3). Under the action of the fluid, the elastic member (60) acts on the valve flap (50) to move the valve flap (50) away from or abut against the valve seat (2).

2. The ultra-low pressure safety valve according to claim 1, characterized in that: A limiting groove (52) is provided in the chamber (51), the elastic component (6) comprises an elastic member (60) and an elastic member fixing seat (61), and the lower end of the elastic member (60) and the valve flap (50) are limited and matched by the limiting groove (52).

3. The ultra-low pressure safety valve according to claim 1, characterized in that: It also includes a short rod (7), the lower end of the short rod (7) is provided with a protrusion (70), the upper end of the elastic member fixing seat (61) is provided with an indented groove (610), and the protrusion (70) is fixedly connected in the indented groove (610).

4. The ultra-low pressure safety valve according to claim 3, characterized in that: The upper end of the short rod (7) is fixedly connected to the valve cap (4).

5. The ultra-low pressure safety valve according to claim 1, characterized in that: The elastic member (60) is a lightweight spring.

6. The ultra-low pressure safety valve according to claim 1, characterized in that: The lower end of the valve seat (2) is connected to the valve body (1), and the upper end extends into the valve cavity and contacts the valve flap assembly (5). The valve seat (2) includes an adjustment ring (20), and the adjustment ring (20) is arranged at the upper end of the valve seat (2) and abuts against the lower end of the valve flap (50).

7. The ultra-low pressure safety valve according to claim 1, characterized in that: The lower end surface of the valve disc (50) is provided with an annular groove (501) and a circular groove (502); the diameter of the circular groove (502) is larger than the diameter of the upper opening of the valve seat (2); and the annular groove (501) is provided on the outer ring of the circular groove (502).

8. The ultra-low pressure safety valve according to claim 3, characterized in that: The short rod (7) includes an adjusting screw sleeve (71), which is arranged on the outer periphery of the short rod (7) and connected to the short rod (7). The adjusting screw sleeve (71) is provided with a thread and can be threadedly connected to the upper end of the valve cover (3).

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