Three-way non-return valve

Abstract

This invention relates to a valve, and more particularly to a three-way check valve that allows a medium to flow only in one direction at a time, preventing simultaneous flow in both directions and preventing backflow. The technical problem this invention aims to solve is to enable the automatic outflow of water from a storage tank when the domestic drinking water supply system is interrupted. Storage tanks installed in domestic water supply systems are primarily used for water storage and natural water heating. When the water supply system is operating normally, the storage tank can automatically receive and release water. However, when the water supply is interrupted, the tank cannot release water normally, requiring manual opening of the drain valve to release the water. The technical solution to this problem is to install a three-way check valve at the inlet of the storage tank. This valve contains a valve plate that can rotate 90° internally. Under the force of the water flow, the valve plate can automatically rotate and change the direction of water flow, ensuring that water can only flow in one direction and not backwards. This invention allows water in the storage tank to automatically flow out when the system is interrupted, thus meeting normal usage requirements. The purpose of a three-way check valve is to be installed at the inlet of a water storage tank to regulate the water flow from the tank.

Description

Technical Field

[0001] This invention relates to a valve, and more particularly to a three-way check valve in which the medium can only flow from one direction to another in the indicated direction, and cannot flow to both directions simultaneously or back. Background Technology

[0002] Valve design and manufacturing technology. Summary of the Invention

[0003] This invention is a three-way check valve, such as... Figure 1 As shown. The three-way check valve is T-shaped and has a valve plate inside the valve body that can rotate 90° automatically. The valve plate can rotate automatically under the action of water flow force from different directions through the valve body. After rotation, it can change the direction of water flow and make the water flow only in one direction and not in reverse.

[0004] like Figure 2 As shown: When water comes from direction A, the valve plate closes direction C under the action of water flow force, and the water can only flow to direction B, and the water flow cannot flow back from direction B to direction A.

[0005] like Figure 3 As shown: When water comes from direction B, the valve plate is closed in direction A and opened in direction C under the action of water flow force. Water can only flow from direction B to direction C, but cannot flow to direction A.

[0006] The above is the core of the three-way check valve.

[0007] Applications of three-way check valves: In domestic drinking water supply systems, water storage tanks are typically installed indoors or at the highest point of a building (e.g., Figure 4 (As shown), the storage tank serves two purposes: first, it stores water to provide drinking water during water supply outages; second, it allows for natural heating of domestic water. Since the incoming water temperature in the supply network is low, the water entering the storage tank can naturally warm to room temperature, improving water comfort. Alternatively, the temperature difference required for water to reach the water heater after exiting the storage tank is smaller, saving energy. The process flow is as follows: Figure 4 As shown, the main domestic water supply originates from L1, flows into the storage tank in the direction indicated by arrow a, and then flows out of the storage tank in the direction indicated by arrow b, entering the water-using equipment. At this time, valve F2 is closed. In the diagram, F1 is the main inlet valve; F4 is the check valve; F3 is the automatic air vent valve; and F2 is the shut-off valve between the inlet and outlet water.

[0008] The current technology has the following problem: when the water supply system is interrupted, the water in the storage tank cannot flow out automatically. This is because the process flow of the storage tank is low inlet and high outlet, such as... Figure 4As shown, water enters the storage tank in the direction of arrow a and flows out of the storage tank in the direction of arrow b, flowing towards the water-using equipment. Only this process can ensure that the water flowing out of the storage tank is room temperature water. However, when the water supply system is interrupted, the water in the storage tank cannot flow out automatically. In this case, the water must be manually opened (e.g., valve F2). Figure 5 As shown in the diagram, water in the storage tank can flow out in the direction indicated by arrow C, flowing to the water-using equipment. However, if the system resumes normal water supply after this operation, valve F2 must be closed immediately; otherwise, the total system water supply will flow directly to the water-using equipment in the direction indicated by arrow f (e.g., ...). Figure 5 As shown in the image, the water storage tank is bypassed, which not only eliminates the function of the water storage tank but also prevents the water in the tank from being replenished, making it inconvenient to use.

[0009] The invention of the three-way check valve solved the problem that water in the storage tank could not flow out automatically after the water supply system was shut off.

[0010] The solution to this problem is to install a three-way check valve F5 (e.g., at the inlet pipe of the water storage tank) on the pipe. Figure 6 , Figure 7 As shown), the internal structure and working status of F5 are shown in (…). Figure 2 , Figure 3 (As shown).

[0011] The function of a three-way check valve is that, under the action of water flow through the valve body, the valve plate can rotate, and the direction of rotation is determined by the direction of incoming water, which in turn determines the direction of outgoing water (e.g., Figure 2 , Figure 3 As shown). When the system water supply is normal (e.g. Figure 6 As shown), water enters the storage tank from the main inlet L1 along the path indicated by arrow d through the three-way check valve F5. At this time, the working status of the three-way check valve plate is as follows (e.g., Figure 2 As shown in the diagram, water flows directly from side A to side B along the direction of arrow d into the water storage tank. The bypass side C is closed. After entering the water storage tank, the water flows out along the direction shown by arrow e, flowing to the water-using equipment. When the system is shut off (e.g., when...), Figure 7 (As shown) Water in the storage tank will flow out through the three-way check valve F5 in the direction indicated by arrow g, flowing towards the water-using equipment. At the same time, the automatic air inlet and outlet valve F3 will also open automatically. The working status of the three-way check valve F5 (as shown) Figure 3 As shown in the diagram, water flows from side B to side C in the direction indicated by arrow g, with side A closed. With side A closed, the three-way check valve functions as a check valve, preventing water in the storage tank from flowing back into the water supply system.

[0012] The above achieves the automatic control function of the three-way check valve. Attached Figure Description

[0013] (1) Figure 1 Vertical view of a three-way check valve.

[0014] (2) Figure 2 This is a vertical cross-sectional view of a three-way check valve. This view shows that water flows from side A to side B and is closed at side C. It is a cross-sectional view of the working state of the three-way check valve when the water supply system is normal.

[0015] (3) Figure 3 This is a vertical cross-sectional view of a three-way check valve, showing that water flows from side B to side C, while side A is closed. It represents the working state of the three-way check valve when the water supply system is interrupted.

[0016] (4) Figure 4 A process flow diagram of a water storage tank without a three-way check valve during normal water supply.

[0017] (5) Figure 5 The process flow diagram of a water storage tank without a three-way check valve when the water supply system is interrupted.

[0018] (6) Figure 6 The process flow diagram of a water storage tank equipped with a three-way check valve during normal water supply.

[0019] (7) Figure 7 The process flow diagram of a water storage tank equipped with a three-way check valve when the water supply system is interrupted. Detailed Implementation

[0020] (1) The manufacturing method of this three-way check valve is the same as that of ordinary check valves. It can be made of pure copper or stainless steel and follows valve manufacturing standards.

[0021] (2) The cross-section of the valve plate is dovetail-shaped, such as Figure 1 Figure 2 Figure 3 As shown.

[0022] The dovetail shape of the valve plate increases the impact resistance of the water flow when the valve plate rotates from side C to side A, thus ensuring smooth rotation and accurate and timely closure. Figure 3 (As shown).

Claims

1. The three-way check valve is shaped like a regular three-way valve. The valve body has a valve plate that can rotate 90° inside. The valve plate can rotate automatically under the action of the water flow force through the valve body. The direction of water inflow determines the direction of rotation and changes the direction of water outflow.

2. The valve plate has a dovetail-shaped cross-section, which helps to increase the impact resistance of the water flow when the valve plate rotates, making it rotate smoothly and close accurately and promptly.

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