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Pressure Pre Stop Fluctuation Valve
Pressure fluctuation pre check valve is an automatic control valve designed to reduce pressure fluctuations in the pipeline system caused by pump shutdown or power outage, and can reliably protect the pump and pump station. This valve is a pilot valve controlled, hydraulically driven diaphragm control valve.
1、 Introduction to pressure fluctuation valve: Pressure fluctuation pre check valve is an automatic control valve designed to reduce pressure fluctuations in the pipeline system caused by pump shutdown or power outage, and can reliably protect the pump and pump station. This valve is a pilot valve controlled, hydraulically driven diaphragm control valve. Sudden pump shutdown usually results in significant pressure fluctuations. In water supply systems with long pipelines, this pressure fluctuation often exhibits a significant low-pressure section, followed by the occurrence of high-pressure section excitation. The low-pressure control pilot valve can sense this initial pressure drop and open itself, causing the main valve to open accordingly, thereby preventing high pressure fluctuations from returning from the system. The opened main valve will release the accompanying high-pressure wave into the atmosphere. The high-pressure control pilot valve will sense the same high-pressure force wave and open it, keeping the main valve open and discharging excess energy. A hydraulic or instrument flow controller can limit the opening of valves. This device can effectively control the release of pressure fluctuations and ensure timely closure of the main valve, avoiding additional loss of system pressure. When the system pressure returns to the set value of the high-pressure control pilot valve, the pilot valve itself will close, causing the main valve to close, stabilizing the pressure in the system between the predetermined values of high and low pressure. The S550X valve not only prevents pressure fluctuations, but also has the function of maintaining system pressure. It achieves this function by venting excessive pressure into the atmosphere. When the system pressure exceeds the set value of the high relief pilot valve, the pilot valve will open, causing the main valve to open and release the system pressure. If the system pressure recovers and falls below the set value of the pilot valve, the pilot valve will close, causing the main valve to slowly close.
2、 Specific working principle of pressure fluctuation valve: When the pipeline pressure is under normal conditions, the sampling tube of the fluctuation valve passes through the Y-shaped filter and reaches the upper part of the fluctuation valve diaphragm. Due to a buffering small hole at the lower part of the diaphragm valve that is connected to the valve body, there is no pressure difference between the upper and lower parts of the diaphragm valve. The fluctuation valve closes by the spring force of the lower part of the diaphragm. When the pressure in the pipeline suddenly increases, the pressure in the sampling tube also suddenly increases, and the pressure in the lower part of the high-pressure pilot valve diaphragm suddenly increases. When the pressure rises to greater than the spring pressure of the low-pressure pilot valve, the high-pressure pilot valve opens, and the water in the upper part of the fluctuation valve diaphragm is released. After the pressure in the upper part of the pressure fluctuation valve diaphragm is released, the diaphragm overcomes the spring force of the fluctuation valve, and the fluctuation valve opens. After the high-pressure pilot valve opens, the At this point, the low-pressure pilot valve is opened due to the spring force, Further release the water in the diaphragm chamber of the pressure fluctuation valve, so as to open the pressure fluctuation valve as soon as possible. When the water pressure in the pipeline drops, the water below the diaphragm of the high-pressure pilot valve is insufficient to overcome the spring force on the low-pressure pilot valve. The high-pressure pilot valve closes, and the low-pressure pilot valve also closes accordingly. At this time, the upper part of the diaphragm of the fluctuation valve is filled with water, and there is no pressure difference between the upper and lower parts of the diaphragm of the fluctuation valve. The fluctuation valve closes by the action of the spring force. Due to the lower chamber being connected to the pressure inside the valve body through a fixed small hole, the closing of the valve is buffered.
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