Automatic reflux three-way valve

1、 Automatic reflux three-way valve product introduction:
Automatic reflux three-way valve, also known as pump protection valve, is used to protect centrifugal pumps from damage caused by residual overheating, severe noise, instability, and cavitation under low flow conditions.
It consists of a valve body, a main valve core, a return valve, etc. The valve body is equipped with an inlet, an outlet, and a return channel. Inside the valve body, there is a main valve core between the inlet and outlet, and an elastic reset device is installed between the main valve core and the valve body. The reset device keeps the main valve core blocking the valve body flow channel. The tempering channel is connected to the water inlet, and a return valve is installed in the return channel. The return valve is connected to the main valve core through a lever mechanism. The advantages of this utility model lie in its simple structure, reliable operation, and easy implementation.
2、 Structure:
1. The main valve is a spring-loaded lift check valve, and the bypass auxiliary valve is a pressure reducing mechanism with a throttle orifice plate. The opening and closing of its bypass and main flow are automatically completed, only related to the pump outlet flow rate;
2. Triple functionality integrated, with minimal traffic control; Bypass pressure reduction; Mainstream quantity check;
3. Compared with traditional automatic recirculation pump protection systems, this product is a simplified and intensive small flow control system, saving: one set of electric or pneumatic regulating valves, one set of flow measurement and control system, and one separately set check valve, reducing equipment investment costs;
4. Built in check valve, no energy loss; The parameters of the throttling component have been strictly calculated and tested, and there has been no occurrence of overheating flash evaporation;
5. Compact structure and automatic operation, no need for actuators, no need for additional power supply and control signals;
6. Simplified design, easy installation, convenient maintenance, online maintenance, no need for external power supply;
The self-propelled automatic recirculation pump protection valve (also known as air discharge check valve, minimum flow valve) has many characteristics in structure, materials, and process, which make it have excellent performance that other manufacturers find difficult to achieve. It is an ideal choice to replace imports to meet the needs of users.
Three characteristics:
1. The valve runs smoothly, noiseless, and has a long lifespan on the system, making installation and maintenance easy.
2. One valve dual-use, both check and recirculation function. It can automatically adjust the recirculation flow rate according to the size of the pump flow.
3. Causing high-pressure media to flow through multiple small paths consumes a large amount of energy and reduces pressure. This valve only has recirculation when the flow rate is very low, and during normal operation, there is no recirculation, saving the energy consumed by continuous recirculation.
4. This valve is an energy-saving and environmentally friendly product. The automatic recirculation control valve does not require electrical wiring, nor does it require a regulating valve for adjustment and cut-off. It can minimize the high-speed flow and erosion phenomena generated by the high-pressure system.
4、 Working principle:
According to the detected main flow, the check cone of the main valve disc of the automatic recirculation valve will actively move to a certain position. At the same time, the main valve disc drives the bypass valve stem, transmitting the action of the main valve disc to the bypass. By controlling the position of the bypass valve disc, the throttling area of the bypass is changed, thereby controlling the flow through the bypass. When the main valve disc rises to the top position, the bypass is closed, and the flow of all pumps flows to the process system. This valve has four functions in one.
1. Flow sensing: The main valve disc of the automatic recirculation valve can automatically sense the main flow in the process system, and determine the position of the main valve disc and bypass valve disc based on this flow.
2. Recirculation control: Mingke automatic recirculation valve can suck the small flow of zui required for normal operation of the pump into the storage device through the bypass, regulate the H-Q characteristics of the pump, and achieve recirculation.
3. Bypass multi-stage pressure reduction: The bypass control system can reduce the high pressure of the reflux medium from the pump outlet to a suitable low pressure in the reflux storage device with low noise and minimal wear.
4. Check valve: The automatic recirculation valve also serves as a check valve to prevent liquid from flowing back into the pump body. Bypass check can be an optional function
5. Other bypass sizes can be made according to requirements: the largest bypass flow depends on the largest Kv value
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