Four fluorine centrifugal pump installation check valve is in the export or import, after before the valve or valve

Four fluorine in centrifugal pump is the chemical industry for conveying acid alkali and corrosive liquid centrifugal pump, known as the centrifugal pump is usually not with self-priming function, need filling cavity when using, the commonly used method is to install the check valve, then four fluorine centrifugal pump in the use of check valve, is installed in what position, is the export or import centrifugal pump, some more than with a valve, may use multiple valve at the same time, so check valve is installed in the valve of the front or the back? Check valve and check valve, is a kind of automatic valve, it depends on the pressure of the pipe flow medium drive valve disc, valve to close and open, when the media stops flowing, close the valve flap of check valve, backflow medium, it can effectively prevent the pipe to protect the safety of pipeline and the centrifugal pump pump cavity fluid backflow has played a big role. Check valve according to its structure, can be divided into the lift check valve, swing check valve and butterfly valve. Lift check valve can be divided into vertical and straight-through type two kinds. Swing check valves can be divided into single type, more than double disc type and disc type 3 kinds. Butterfly check valve can be divided into butterfly valve, butterfly single, the above several kinds of check valve in the connection form can be divided into the thread connection, flange connection, welding and clamp connection of four. Install the check valve is to ensure that the centrifugal water pump inside the flow of water, so as to guarantee the normal work of the pump. So about the check valve installation position, what is installed in the pump before and after water pump, can be divided into two kinds of circumstances: one kind is installed in the pump shaft end of the straw before, also called bottom valve. The purpose is to don't have to take a water to a water pump filling, because the water pump and pump before when no water in the suction pumps can only can't idle sheung shui, so must be filled with water in the water pump to take out water. The installation of this water pump is higher than that of liquid level in a way, also called negative pressure method. The second kind is installed in the rear of the pump. This installation method is under the condition of liquid level is higher than the pump, convenient and when the pump is going to stop, don't have to close the water water pump discharge valve, especially for female controls water pump system, to prevent backflow. In general, as a result of the check valve opening and closing action is more frequently, internal connection parts and sealed parts are prone to damage, for ease of repair, prevent due to check the situation of the fault and shut down the whole system, from this point of view, the check valve will be packed in export before the gate valve or butterfly valve. Check valves must be installed in the pump before export, export control valve position, in order to repair the check valve. General pump export before tao is soft connection ( Shock absorber) , followed by the check valve, and then followed by the isolation valve ( Such as butterfly valve, gate valve, globe valve, etc. ) 1, first with the gate valve or butterfly valve check valve installed advantages: can protect butterfly valve or gate, the impact on the check valve. Faults: check who to protect, the check valve by differential pressure switch, pressure if the main work, the pressure of the pump work, if you use the traffic is not stable, then check valve will switch repeatedly, can affect the check valve life. And the check valve is broken, especially female control system, need to repair after service system. After 2, first install the check valve gate valve or butterfly valve advantages: can protect the check valve, especially in parallel pumps, when a pump is not started, the exit door closed, another pump started, the impact is a gate valve or butterfly valve. After check valve failure, import and export valve isolation system can shut down for repair. Faults: gate valve or butterfly valve who to protect? Ever seen a case, the butterfly valve disc is bad.
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