Double-air-hole angled high-reliability pilot valve with dustproof boss

Abstract

The double-air-hole angled high-reliability pilot valve with the dustproof boss comprises a valve cover (1) and a cover column (2) integrally formed with the valve cover, two inclined air holes (3) inclining downwards are symmetrically formed in the side wall of the cover column, and the dustproof boss (4) expanding outwards is arranged at the outlet end of each inclined air hole. The utility model has the beneficial effects that: a redundant double-hole structure is adopted; symmetrical double holes ensure that the exhaust function is still maintained when a single hole is blocked, and the anti-blocking reliability is improved by more than 200%; by means of the gravity self-drainage principle, rainwater cannot flow back into a valve cavity along an inclined hole channel of the inclined air hole, the inclination angle is larger than the critical infiltration angle of liquid (usually lt: 30 degrees), and physical water prevention is achieved; the maintenance-free design is adopted, a traditional dustproof net is omitted, and the manufacturing cost is reduced by more than 20%; dust is difficult to deposit on an inclined hole wall due to the action of gravity, and the sensitivity of the diaphragm is kept at an initial value of 95% or above due to a dry and dust-free environment of a valve cavity.

Description

A high-reliability pilot valve with dual air holes and angled design featuring a dustproof boss. Technical Field

[0001] This utility model relates to the field of fluid transport technology, and in particular to a pilot valve. Background Technology

[0002] A pilot valve (also known as a pilot valve or pilot valve) is a core control component in industrial valve systems. It is mainly used to precisely control the opening or closing of the main valve by sensing changes in pressure, flow rate, or liquid level. Its working principle is to drive or control a large-diameter main valve through a small-diameter precision valve (pilot valve) to achieve system pressure stabilization, venting, or flow regulation.

[0003] For example, Chinese invention patent authorization announcement number CN111734860B discloses a pilot-operated safety valve with an isolation chamber, including a main valve, a pilot valve, a main valve inlet and a main valve outlet, and a main valve chamber inside the main valve. The pilot valve includes a pilot valve body and a pilot valve cover, and the pilot valve cover has an exhaust nozzle 53. The exhaust nozzle plays the role of balancing the air pressure inside the pilot valve cover. Having only a single vertical air hole (diameter 1.5-2.5mm) has two major drawbacks: easy clogging: dust and insects can easily enter the vertical channel, causing the valve chamber to fail to exhaust, and the diaphragm cannot respond to pressure changes; easy water ingress: rainwater flows directly into the valve chamber along the vertical hole, and accumulated water corrodes the diaphragm and reduces its sensitivity. Summary of the Invention

[0004] The technical problem to be solved by this utility model is that the existing valve cover vent design has two major defects. To address this, a high-reliability pressure reducing valve with angled dual vents is provided.

[0005] The technical solution of this utility model is: a high-reliability pilot valve with a double air hole and angle with a dustproof protrusion, comprising: a valve cover and a cover column integrally formed with the valve cover, wherein two downwardly inclined air holes are symmetrically opened on the side wall of the cover column, and the outlet end of the inclined air hole is provided with an outwardly expanding dustproof protrusion.

[0006] In the above scheme, the central axis of the two inclined air holes is at an angle of 30° to 45° with the axis of the cover column.

[0007] The diameter of the inclined air hole in the above scheme is 1.4mm to 2.6mm.

[0008] In the above scheme, the center distance between the two inclined air holes is 0.1 to 0.15 times the diameter of the cap column.

[0009] The surface roughness Ra of the inclined pore inner wall in the above scheme is ≤3.2μm.

[0010] The cone angle of the dustproof boss described in the above scheme is 5° to 20°.

[0011] The beneficial effects of this invention are: a redundant dual-hole structure; symmetrical dual holes ensure that the venting function is maintained even when a single hole is blocked, improving anti-clogging reliability by more than 200%; utilizing the principle of gravity self-drainage, rainwater cannot flow back into the valve chamber along the inclined channels of the inclined air holes; dustproof protrusions are located on the upper part of the two inclined air holes, further preventing the direct entry of dust and other debris. The inclination angle of the inclined air holes is greater than the critical wetting angle of the liquid (usually <30°), achieving physical waterproofing; maintenance-free design: eliminating the traditional dustproof mesh, reducing manufacturing costs by more than 20%; extended diaphragm life: dust is difficult to deposit on the inclined hole walls due to gravity, and the dry and dust-free environment of the valve chamber allows the diaphragm sensitivity to remain above 95% of its initial value. Attached Figure Description

[0012] Figure 1 is a schematic diagram of this utility model;

[0013] Figure 2 is a schematic diagram of the inclined air hole in this utility model;

[0014] In the diagram, 1 is the valve cover, 2 is the cover post, 3 is the inclined air hole, and 4 is the dustproof protrusion. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] The "cap post" of a valve cover typically refers to a raised, cylindrical component in the valve cover structure used for positioning or fixing. Its core function is to ensure the precise alignment and stable assembly of internal valve cover components (such as valve plates, sealing rings, etc.). The cap post (or "protruding post" or "positioning post") is a cylindrical structure that protrudes from the valve cover body (especially the end cap section), usually located on the side of the end cap facing the cover plate.

[0017] As shown in Figures 1-2, a high-reliability pilot valve with dual air holes and angled design and dustproof protrusions includes: a valve cover 1 and a cover post 2 integrally formed with the valve cover. The side wall of the cover post has two downwardly inclined air holes 3 symmetrically opened, and the outlet end of the inclined air holes is provided with an outwardly expanding dustproof protrusion 4.

[0018] The valve cover 1 and the cover post 2 are integrally cast from stainless steel, with the cover post having a diameter of 30mm. Two inclined air holes 3 with diameters of 1.4mm, 1.8mm, or 2.6mm are symmetrically machined on the side wall of the cover post, with the central axis inclined downward at 30°, 40°, or 45° to the axis of the cover post. The center distance between the inclined air holes is 0.1 times or 0.15 times the diameter of the cover post. The surface roughness Ra of the inner wall of the inclined air holes is ≤3.2μm. Dustproof bosses 4 with angles of 5°, 8°, 10°, or 20° are machined at the outlet of the air holes, and the inner wall is polished to Ra=2.5μm.

[0019] Since the failure probability of dual holes is the square of that of single holes, the reliability of anti-clogging is improved by more than 200%.

[0020] Those skilled in the art should know that the protection scheme of this utility model is not limited to the above embodiments, and various arrangements, combinations and transformations can be made on the basis of the above embodiments. Without violating the spirit of this utility model, all transformations made to this utility model fall within the protection scope of this utility model.

Claims

1. A high-reliability pilot valve with dual vents and angled design featuring a dustproof boss, comprising: The valve cover (1) and the cover post (2) integrally formed with the valve cover are characterized in that: the side wall of the cover post is symmetrically provided with two downwardly inclined air holes (3), and the outlet end of the inclined air holes is provided with an outwardly expanding dustproof protrusion (4).

2. The high-reliability pilot valve with dual air holes and angled design and dustproof boss as described in claim 1, characterized in that: The central axis of the two inclined air holes is at an angle of 30° to 45° with the axis of the cap column.

3. The high-reliability pilot valve with dual air holes and angled design and dustproof boss as described in claim 1, characterized in that: The diameter of the inclined air hole is 1.4 mm to 2.6 mm.

4. A high-reliability pilot valve with dual air holes and angled design and dustproof boss as described in claim 1, characterized in that: The center distance between the two inclined air holes is 0.1 to 0.15 times the diameter of the cap column.

5. A high-reliability pilot valve with dual air holes and angled design and dustproof boss as described in claim 1, characterized in that: The surface roughness Ra of the inner wall of the inclined vent is ≤3.2μm.

6. A high-reliability pilot valve with dual vents and angled design and dustproof boss as described in claim 1, characterized in that: The cone angle of the dustproof boss is 5° to 20°.

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