Hydraulic control valve for irrigation

Abstract

This utility model discloses a hydraulic control valve for irrigation, belonging to the technical field of irrigation equipment. It includes a valve body, valve cover, valve seat, valve disc, guide rod, valve stem, spring, diaphragm, and sealing gasket. The valve body is fixedly connected to the valve cover. The valve seat is located inside the valve body at the water inlet end. The valve disc is connected to the diaphragm via the valve stem. The guide rod guides the movement of the valve stem. The spring is sleeved on the outside of the valve stem, with its two ends abutting against the valve cover and valve disc respectively. The synergistic action of the spring and diaphragm achieves a sensitive response for hydraulic control. The spring, sleeved on the outside of the valve stem, forms a stable reset mechanism through pre-tightening force. When the irrigation system pressure changes, the diaphragm can quickly sense the pressure difference and drive the valve stem to move the valve disc, promptly adjusting the valve opening to ensure that the irrigation pressure is maintained within a suitable range. This avoids pipe rupture due to sudden pressure increases or uneven irrigation due to insufficient pressure, thus ensuring irrigation quality.

Description

Technical Field

[0001] This utility model relates to the field of irrigation equipment technology, specifically to an irrigation hydraulic control valve. Background Technology

[0002] Hydraulic control valves are core control devices in irrigation systems. They achieve automatic control through water pressure differences. Using internal pressure sensing elements and control mechanisms, they adjust the valve core opening when the water pressure in the pipeline changes, thereby controlling the flow rate, pressure, or direction of the water. Depending on the external pipeline configuration, hydraulic control valves can be extended to include pressure regulating valves, flow regulating valves, check valves, and electrically controlled valves, and are widely used in agricultural irrigation (farmland, orchards, tea gardens, etc.), urban landscaping irrigation (parks, squares, roadside green belts, etc.), and large-scale commercial landscape irrigation projects.

[0003] Existing hydraulic control valves have certain shortcomings in practical applications: some valves have poor sealing performance, which can easily lead to leakage after long-term use, affecting irrigation efficiency; the accuracy of pressure and flow regulation is limited, making it difficult to meet the personalized needs of different crops, different growth stages, and different irrigation methods (drip irrigation, sprinkler irrigation, etc.), and the protection effect on the irrigation system needs to be improved, as it cannot effectively avoid damage to pipelines and equipment caused by water hammer, backflow, and other problems. Therefore, those skilled in the art have provided an irrigation hydraulic control valve to solve the problems mentioned in the background art. Utility Model Content

[0004] The purpose of this invention is to provide an irrigation hydraulic control valve to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: An irrigation hydraulic control valve includes a valve body, a valve cover, a valve seat, a valve disc, a guide rod, a valve stem, a spring, a diaphragm, and a sealing gasket. The valve body is fixedly connected to the valve cover, the valve seat is located inside the valve body at the water inlet end, the valve disc is connected to the diaphragm via the valve stem, the guide rod guides the movement of the valve stem, the spring is sleeved on the outside of the valve stem and its two ends abut against the valve cover and the valve disc respectively, and the sealing gasket is located at the connection between the valve body and the valve cover.

[0006] As a further improvement of this utility model: both the valve body and the valve cover are made of ductile iron, and the outer surfaces of the valve body and the valve cover are treated with electrostatic spraying.

[0007] As a further improvement of this utility model, the valve seat, valve disc and valve stem are all made of 316 stainless steel.

[0008] As a further improvement of this utility model: both the inlet end and the outlet end of the valve body are connected to a splicing plate, and a set of splicing holes are opened inside the two splicing plates.

[0009] As a further improvement of this utility model: the diaphragm is made of a composite material of nitrile rubber and polyester fiber, and the edge of the diaphragm is pressed and fixed to the valve body and valve cover by a pressure ring.

[0010] As a further improvement of this utility model: the spring is made of piano wire, and the surface of the spring is subjected to zinc plating passivation treatment.

[0011] Compared with the prior art, the beneficial effects of this utility model are: This irrigation hydraulic control valve achieves sensitive hydraulic control response through the synergistic action of a spring and a diaphragm. The spring, sleeved on the outside of the valve stem, forms a stable reset mechanism through pre-tightening force. When the irrigation system pressure changes, the diaphragm quickly senses the pressure difference and drives the valve stem to move the valve disc, promptly adjusting the valve opening to ensure the irrigation pressure remains within a suitable range. This avoids pipe rupture due to sudden pressure increases or uneven irrigation due to insufficient pressure, ensuring irrigation quality. Simultaneously, the sealing gasket design at the connection between the valve body and valve cover further enhances the overall sealing performance, effectively preventing sediment and impurities in the irrigation water from entering the valve's internal gaps. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of an irrigation hydraulic control valve; Figure 2 A top view of an irrigation hydraulic control valve; Figure 3 This is a schematic diagram of the planar structure of an irrigation hydraulic control valve.

[0013] In the diagram: 1. Valve body; 2. Valve seat; 3. Valve disc; 4. Valve cover; 5. Guide rod; 6. Valve stem; 7. Spring; 8. Diaphragm; 9. Sealing gasket; 10. Splicing plate; 11. Splicing hole. Detailed Implementation

[0014] Please see Figures 1-3In this embodiment of the utility model, an irrigation hydraulic control valve includes a valve body 1, a valve cover 4, a valve seat 2, a valve disc 3, a guide rod 5, a valve stem 6, a spring 7, a diaphragm 8, and a sealing gasket 9. The valve body 1 is fixedly connected to the valve cover 4. The valve seat 2 is located inside the valve body 1 at the water inlet end. The valve disc 3 is connected to the diaphragm 8 through the valve stem 6. The guide rod 5 is used to guide the movement of the valve stem 6. The spring 7 is sleeved on the outside of the valve stem 6 and its two ends abut against the valve cover 4 and the valve disc 3, respectively. The sealing gasket 9 is located at the connection between the valve body 1 and the valve cover 4. By adopting the linkage structure of the valve disc 3, the valve stem 6, and the diaphragm 8, and with the precise guidance of the guide rod 5, the movement trajectory of the valve stem 6 is stable and controllable, effectively avoiding misalignment and wear between the valve disc 3 and the valve seat 2, ensuring the fitting accuracy of the sealing pair during valve opening and closing, reducing ineffective leakage of irrigation water, and improving water resource utilization. The guide rod 5 solves the problem of easy displacement of the valve stem 6 in traditional control valves, which leads to sealing failure, and enables the valve to maintain stable performance under high-frequency opening and closing conditions.

[0015] Both the valve body 1 and valve cover 4 are made of ductile iron. The outer surfaces of both the valve body 1 and valve cover 4 are treated with electrostatic spraying. The valve seat 2, valve disc 3, and valve stem 6 are all made of 316 stainless steel. Both the inlet and outlet ends of the valve body 1 are connected to splicing plates 10. Each splicing plate 10 has a set of splicing holes 11. The valve body 1 and valve cover 4 are made of ductile iron, which, compared to ordinary cast iron, has higher strength, toughness, and impact resistance. It can withstand pressure fluctuations in irrigation systems and mechanical impacts during outdoor operations, and is less prone to cracking, deformation, and other damage. The valve seat 2... The valve disc 3 and valve stem 6 are made of 316 stainless steel, which has excellent corrosion resistance, wear resistance and high temperature resistance. It can withstand the erosion of corrosive media such as fertilizer residues and minerals that may be contained in irrigation water. At the same time, the contact surface between the valve disc 3 and the valve seat 2 can maintain good sealing during long-term friction, reducing the risk of valve failure caused by component wear. Through the design of the splicing plate 10 and splicing hole 11 at the water inlet and outlet of the valve body 1, the valve can be quickly spliced ​​and fixed to the irrigation pipeline with bolts. The installation process is simple and convenient, without the need for complicated special tools, which reduces the installation difficulty and construction cost.

[0016] The diaphragm 8 is made of a composite material of nitrile rubber and polyester fiber. The edge of the diaphragm 8 is pressed and fixed to the valve body 1 and valve cover 4 by a pressure ring. The spring 7 is made of piano wire, and the surface of the spring 7 is galvanized and passivated. The use of a composite material of nitrile rubber and polyester fiber for the diaphragm 8 provides excellent oil resistance, water resistance, and elasticity, allowing it to fit tightly into the inner cavity of the valve body 1 and ensure accurate pressure sensing. The reinforcing effect of the polyester fiber improves the tensile strength and tear resistance of the diaphragm 8, preventing aging and damage under long-term pressure and extending the service life of the diaphragm 8. The use of piano wire for the spring 7, combined with the galvanized and passivated surface treatment, not only provides excellent elastic recovery performance, ensuring that the preload remains stable after long-term use, but its galvanized and passivated coating also effectively isolates moisture and air, preventing the spring 7 from rusting and jamming, and ensuring the reliable operation of the valve reset mechanism.

[0017] The working principle of this utility model is as follows: When the valve is not connected to the irrigation system or the system is not started, the spring 7 is in a pre-compressed state. Its elastic force is transmitted to the valve stem 6 through the valve disc 3, causing the valve disc 3 to tightly fit the sealing surface of the valve seat 2. At this time, the valve is in a closed state, blocking the flow of water. The diaphragm 8, as a pressure sensing element, is connected to the internal cavity of the valve cover 4 and the water inlet cavity of the valve body 1 on its upper and lower sides, respectively. Initially, the pressure on both sides is balanced. When the irrigation system is started and the water pump starts supplying water, the pressure at the water inlet of the valve body 1 gradually increases. After the water flows into the water inlet cavity of the valve body 1, part of the pressure acts on the lower surface of the diaphragm 8. When this pressure is greater than the sum of the preload of the spring 7 and the pressure on the upper surface of the diaphragm 8, the pressure difference drives the diaphragm 8 to bulge upward and deform. The deformation of the diaphragm 8 is transmitted to the valve disc 3 through the valve stem 6, causing the valve disc 3 to move upward against the spring force 7. This creates a gap between the valve disc 3 and the valve seat 2, through which water flows into the irrigation pipe via the outlet of the valve body 1, completing the valve opening action. After the valve opens, the pressure of the irrigation system is in dynamic change. When the system pressure increases, the pressure acting on the lower surface of the diaphragm 8 increases accordingly, causing the diaphragm 8 to bulge further upward. The valve stem 6 drives the valve disc 3 to continue moving upward, increasing the valve opening and the water flow, thereby reducing the system pressure. When the system pressure decreases, the pressure on the lower surface of the diaphragm 8 decreases, and the elastic force of the spring 7 is greater than the pressure difference. The spring 7 pushes the valve disc 3 downward, decreasing the valve opening and the water flow, causing the system pressure to rise again. During this process, the guide rod 5 precisely constrains the movement direction of the valve stem 6, ensuring that the valve stem 6 moves only axially, avoiding sealing problems or jamming caused by valve disc 3 offset. Through a cycle of pressure sensing, opening adjustment, and pressure feedback, the valve automatically regulates the pressure and flow of the irrigation system, maintaining stable system pressure. The above is the complete operating procedure of this device.

[0018] The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and therefore all variations falling within the meaning and scope of equivalent elements of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A hydraulic control valve for irrigation, characterized in that, The valve body (1), valve cover (4), valve seat (2), valve disc (3), guide rod (5), valve stem (6), spring (7), diaphragm (8), and sealing gasket (9) are included. The valve body (1) is fixedly connected to the valve cover (4). The valve seat (2) is located at the water inlet end inside the valve body (1). The valve disc (3) is connected to the diaphragm (8) through the valve stem (6). The guide rod (5) is used to guide the movement of the valve stem (6). The spring (7) is sleeved on the outside of the valve stem (6) and its two ends abut against the valve cover (4) and the valve disc (3) respectively. The sealing gasket (9) is located at the connection between the valve body (1) and the valve cover (4).

2. The irrigation hydraulic control valve according to claim 1, characterized in that, The valve body (1) and valve cover (4) are both made of ductile iron, and the outer surfaces of the valve body (1) and valve cover (4) are both treated with electrostatic spraying.

3. The irrigation hydraulic control valve according to claim 1, characterized in that, The valve seat (2), valve disc (3) and valve stem (6) are all made of 316 stainless steel.

4. The irrigation hydraulic control valve according to claim 1, characterized in that, Both the inlet and outlet ends of the valve body (1) are connected to splicing plates (10), and a set of splicing holes (11) are opened inside the two splicing plates (10).

5. The irrigation hydraulic control valve according to claim 1, characterized in that, The diaphragm (8) is made of a composite material of nitrile rubber and polyester fiber. The edge of the diaphragm (8) is pressed and fixed to the valve body (1) and valve cover (4) by a pressure ring.

6. The irrigation hydraulic control valve according to claim 1, characterized in that, The spring (7) is made of piano wire, and the surface of the spring (7) is galvanized and passivated.

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