Cover type valve cover for protecting pilot valve rubber diaphragm

Abstract

The utility model discloses a cover type valve cover for protecting a guide valve rubber diaphragm, which comprises a valve cover (1), a rubber diaphragm (4) and a flange (2) positioned at the bottom of the valve cover, and an annular boss (3) surrounding the edge of the rubber diaphragm is arranged on the lower surface of the flange. The utility model has the beneficial effects that when the valve cover and the valve body are fastened through the bolt, the annular boss extends downwards and completely covers the outer edge of the rubber diaphragm to form a physical isolation barrier. By means of the design, corrosion of acid rain, salt mist, ultraviolet rays and dust to the edge of the diaphragm is effectively blocked, rubber aging is delayed, the problem of early failure caused by environmental exposure of a traditional pilot valve diaphragm is solved, and the service life of the diaphragm is prolonged by more than two times.

Description

A cover-type valve cover for protecting the rubber diaphragm of the pilot valve Technical Field

[0001] This utility model relates to the field of industrial valve sealing and protection technology, and in particular to a cover-type valve cover for protecting the rubber diaphragm of a pilot valve. Background Technology

[0002] Traditional pilot valve structure: The rubber diaphragm is directly clamped between the valve cover flange and the valve body flange, with the outer edge of the diaphragm completely exposed. The exposed area is susceptible to environmental erosion, leading to acid rain / salt spray corrosion that accelerates the hardening of the rubber; ultraviolet radiation causes cracking of the rubber layer; and dust embeds itself at the interface between the diaphragm and the flange, compromising the seal.

[0003] For example, Chinese invention patent publication number CN117189924A discloses a pressure reducing valve, which includes a basic valve consisting of a valve body, a lower valve stem, a valve seat, a lower pressure plate, a sealing ring, a bracket 1, a diaphragm, an upper pressure plate, a hexagonal nut 1, a spring, a valve cover, a bushing, a bracket 2, an external hexagonal bolt 2, a hexagonal nut 2, a scale plate, an indicator sleeve, an upper valve stem, a handwheel, a nameplate, and a hexagonal nut 3, as well as a control assembly consisting of a small ball valve, a pressure gauge, a pressure reducing pilot valve, a needle valve, a bend, and a connector. The diaphragm (9) is sealed to the bracket 1 (7) and the upper pressure plate (10) by an O-ring 2 (8). The outer edge of the diaphragm in this patent is completely exposed, making it susceptible to environmental erosion that could damage its sealing performance. Summary of the Invention

[0004] The technical problem to be solved by this invention is that the outer edge of the rubber diaphragm of the existing pilot valve is exposed. To this end, a cover-type valve cover is provided to protect the rubber diaphragm of the pilot valve.

[0005] The technical solution of this utility model is: a cover-type valve cover for protecting the rubber diaphragm of the pilot valve, comprising: a valve cover, a rubber diaphragm and a flange located at the bottom of the valve cover, wherein the lower surface of the flange is provided with an annular boss that surrounds the edge of the rubber diaphragm.

[0006] In the above scheme, the gap between the annular boss and the edge of the valve body is 0.3mm.

[0007] The annular boss described in the above scheme has a wall thickness of 0.6 mm and a height of 2.0 mm.

[0008] In the above scheme, the outer diameter of the flange is 80mm, and the inner diameter of the annular boss is 85.3mm.

[0009] The outer surface of the annular boss in the above scheme is an 88° conical surface.

[0010] In the above scheme, the annular boss and the flange are transitioned by a rounded corner.

[0011] The radius of the rounded corners described in the above scheme is 2mm.

[0012] The beneficial effect of this invention is that when the valve cover and valve body are fastened together with bolts, the annular protrusion extends downwards and completely covers the outer edge of the rubber diaphragm, forming a physical isolation barrier. This design effectively blocks acid rain, salt spray, ultraviolet rays, and dust from eroding the edge of the diaphragm, delays rubber aging, solves the problem of early failure of traditional pilot valve diaphragms due to environmental exposure, and extends the service life of the diaphragm by more than 2 times. Attached Figure Description

[0013] Figure 1 is a schematic diagram of this utility model;

[0014] Figure 2 is a partial enlarged view of this utility model;

[0015] In the diagram, 1 is the valve cover, 2 is the flange, 3 is the annular boss, and 4 is the rubber diaphragm. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] As shown in Figure 1-2, a cover-type valve cover for protecting the rubber diaphragm of a pilot valve includes: a valve cover 1, a rubber diaphragm 4, and a flange 2 located at the bottom of the valve cover. The lower surface of the flange is provided with an annular boss 3 that surrounds the edge of the rubber diaphragm. The inner diameter D1 of the annular boss satisfies: D1 = D2 + (0.2~0.5) mm, where D2 is the outer diameter of the valve body flange, ensuring assembly clearance; the wall thickness of the annular boss is 0.4 mm, 0, 6 mm, or 0.8 mm, and the height is 1.2 mm, 2 mm, 3 mm, or 3.5 mm, preferably 2 mm, completely covering the outer edge of the diaphragm.

[0018] The angle α between the outer side of the annular boss and the horizontal plane is 85° to 89° (preferably 88°), forming a micro-conical surface to help rainwater fall off. The annular boss and the flange (2) are integrally formed and the material is stainless steel or engineering plastic.

[0019] The annular boss and the flange are connected by a rounded corner with a radius of 2mm to avoid damage to the rubber diaphragm during assembly.

[0020] Beneficial effects:

[0021] 1. Physical isolation environmental factors:

[0022] Acid rain / salt spray contact area reduced by ≥90%;

[0023] 100% UV protection (edge ​​area);

[0024] 2. Increased lifespan:

[0025] Accelerated aging tests (85°C, 85%RH) showed that the membrane life was extended from 6 months to 18 months;

[0026] 3. Sealing guarantee:

[0027] Dust intrusion decreased by 95%, maintaining the stability of bolt preload;

[0028] 4. Cost advantage:

[0029] No additional protective components are required; the one-piece molding increases costs by less than 8%.

[0030] Example:

[0031] The valve cover is made of 304 stainless steel or copper alloy casting, and the flange outer diameter is 80mm.

[0032] Machining of the annular boss: inner diameter D1=85.3mm (corresponding to valve body flange D2=45mm), wall thickness 0.6mm, height 2.0mm, boss 3 is integrally formed with flange 2, and the material is stainless steel or copper alloy;

[0033] The outer side of the annular boss is machined with an 88° micro-conical surface, and the bottom corner is rounded with R=2mm.

[0034] As shown in Figure 2, during assembly, the boss completely covers the outer edge of the rubber diaphragm, with a gap of 0.3mm between it and the valve body. The distance between the diaphragm and the lower flange edge is 0.25mm.

[0035] 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 cover-type valve cover for protecting the rubber diaphragm of a pilot valve, comprising: The valve cover (1), the rubber diaphragm (4) and the flange (2) located at the bottom of the valve cover are characterized in that: the lower surface of the flange is provided with an annular boss (3) that surrounds the edge of the rubber diaphragm.

2. The cover-type valve cover for protecting the rubber diaphragm of the pilot valve as described in claim 1, characterized in that: The gap between the annular boss and the edge of the valve body is 0.3 mm.

3. The cover-type valve cover for protecting the rubber diaphragm of the pilot valve as described in claim 1, characterized in that: The annular boss has a wall thickness of 0.6 mm and a height of 2.0 mm.

4. A cover-type valve cover for protecting the rubber diaphragm of a pilot valve as described in claim 1, characterized in that: The flange has an outer diameter of 80 mm, and the annular boss has an inner diameter of 85.3 mm.

5. A cover-type valve cover for protecting the rubber diaphragm of a pilot valve as described in claim 1, characterized in that: The outer surface of the annular boss is an 88° conical surface.

6. A cover-type valve for protecting the rubber diaphragm of a pilot valve as described in claim 1, characterized in that: The annular boss and the flange are connected by a rounded corner.

7. A cover-type valve cover for protecting the rubber diaphragm of a pilot valve as described in claim 6, characterized in that: The radius of the rounded corner is 2mm.

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