For the majority of water supply enterprises, the accident occurred the most, has a direct impact on water supply, and the most affected site is the pressurized water pump plant, pump room accident means no water, a direct impact on the efficiency of enterprises, the water supply Enterprises have caused serious economic losses and social impacts, so water supply companies refer to pressurized pump houses as the heart of water supply enterprises.
How to ensure the normal operation of each system of pressurized pump room is a problem that water supply enterprises have always been anxious to solve. In order to solve this problem, all water supply enterprises and professionals have been trying their best to find the best solution.
The following analysis of pressure pump room accident frequency:
According to incomplete statistics, more than 90% of pressurized pump house accidents occurred in the water pump and its outlet pipe, the remaining 10% appeared in electric power and other aspects, while 90% of the 90% were found in the outlet of the water pump Configuration, the main performance: lax valve closed, burst and major water hammer accident.
Therefore, frequent pumping station pressure pump incident focused on the pump outlet configuration, which has a direct relationship with the traditional configuration, shown in Figure 1. This configuration has great drawbacks:
(1) When the pump is on, a light-load process must be required in order to prevent the back pressure in the pipe network from acting on the impeller of the pump under the condition that the check valve in front of the pump is opened at an excessive speed. So that when the pump load is too heavy, the current is too large, causing the motor burned, the pump shaft bending, so if you want to achieve this process, in the traditional operation process, you must first open the pump until the pump reaches a certain speed, outlet To overcome the back pressure to open the case, known as: first open the pump, open the valve. Control of this process can only be achieved by setting up an electric valve and a delay pump connection, which is done manually without the electric valve, but the electric valve often fails or is inaccurate due to the delay, and the manpower can not at all Accurate control of the slow release time, often make this light load failure, resulting in frequent motor and pump failure, and this way labor, laborious, unreliable, can not be achieved in the true light load.
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(2) In the pump to stop pumping, in order to prevent the impact of water hammer on the pump and outlet check valve, often first close the control valve, and then stop the pump, in this case, if a sudden power outage, the electric control valve can not be timely Close the manual valve can not rely on manual closure within a very short period of time, coupled with the check valve is not strict, it will reverse the pump non-stop, or water hammer accident.
(3) check valve outlet of the pump, under the impact of water hammer pressure, often appear closed and valve plate broken phenomenon. It is simply impossible to eliminate a water hammer by relying solely on a water hammer eliminator, so there is an urgent need for a device that eliminates water hammer completely. Tianjin Guowei Drainage Equipment Manufacturing Co., Ltd. production of booster pump control valve is developed for some of the shortcomings of the above production, can solve some of the above problems, and without human and electrical operation, is a new energy-saving products. Datong Water Works Second Water Works to be rebuilt by the end of 2001, in the design did not come into contact with the product, still choose the traditional process, the valve selection shown in Figure 2.
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Booster pump automatic control valve is divided into three parts: the main valve, the diaphragm control chamber and the bypass pipe to the membrane is bounded to the chamber above the diaphragm, the drain conduit communicates, the inferior vena diaphragm, And the valve inlet pipe connected to the small valve plate fixed to the valve stem, the large valve plate on the slide up and down.
When the motor is started, the pressure at the inlet of the valve gradually increases. Pressure water: 1) The force that pushes the large valve plate upward is generated, and the valve can not be opened immediately because the diaphragm controls the back pressure of the upper chamber. 2) pressure through the bypass pipe into the diaphragm control chamber lower chamber. As the water inflow into the lower chamber increases, when the pressure in the lower chamber is greater than the pressure in the upper chamber, the lower chamber pressure water urges the diaphragm to move upward, whereupon the small valve plate does not exert pressure on the large valve plate. 3) The large valve plate has a force to promote its upward movement, in the role of these two forces, the valve gradually open, so as to achieve the pump when light load, closing brake, slow open the purpose. When a sudden power outage or accident stop pump or normal stop pump, the water pressure at the inlet of the valve decreases, and the large valve plate also decreases. When the flow rate is zero (ie, the flow velocity at the water inlet is zero), the large valve plate Due to its own gravity and the rapid closure (time 3s ~ 5s), to prevent most of the water back, this time around the valve to form a water pressure, pressure water on the one hand through the small pressure relief valve at the bottom of the three pressure relief slots. 4) pressure water from the bypass pipe into the diaphragm control chamber on the chamber (this process for the suction chamber, can effectively absorb part of the water energy), when the cavity pressure water is greater than the lower chamber, the pressure of water to promote the diaphragm to move down, When all the pressure in the lower chamber is squeezed out, the small valve plate will slowly descend and resume to the standby state. During this process, the slow closing time can be adjusted (3s ~ 150s). At that time, the valve plate will be fully closed and the dripping water will not leak. It is precisely because of its shut down with a quick closure, linear pressure relief, pressure chamber and slow closed four kinds of water hammer to eliminate the function, so stop without noise, the effect is very good.
The new hydraulic valve features are:
(1) Without artificial, no power, completely automatic, rely on the pressure difference between the upper and lower chamber when the pump start and stop to achieve automatic operation and control, to provide favorable conditions for the realization of water supply automation.
(2) Both the control valve, check valve and water hammer eliminator three functions, but also has a linear pressure relief function, saving installation space, to some extent reduce the loss.
(3) wide body design. The minimum flow of the valve is 1.1 times the diameter of the valve, the maximum at more than 2 times the opening and closing pressure is low, so that in the work process, the head loss is small, the pressure loss is small.
Comparison with alternative products in Table 1.
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Can be seen from Table 1, booster pump in the use of pressurized pump room can completely eliminate the water hammer.
In summary, the application of booster pump in pressurized pump room can save installation space, reduce losses and effectively and completely eliminate water hammer, reduce the accident rate, and economically feasible, so that the heart of water supply enterprises safe and reliable beating Datong tap water company to use the valve more than a year, well, it is worth in the majority of water supply industry to promote the use of.
