Case
Case
The bottom valve is installed at the lowest end of the pump suction pipe to prevent the water in the suction pipe from being drained after shutdown.
After the bottom valve is connected to the pipeline, the liquid medium enters the valve body from the direction of the valve cover. The pressure of the liquid acts on the valve disc, causing the valve disc to open and allow the medium to flow through. When the medium pressure in the valve body changes or disappears, the valve disc Close to prevent media backflow.
The bottom valve is an energy-saving valve. It is generally installed at the bottom of the underwater suction pipe of the water pump. It restricts the return of liquid in the water pump pipe to the water source, and has the function of only entering but not exiting. There are many water inlets and reinforcing ribs on the valve cover, which play a role in supporting the waterway. There are single-lobed, double-lobed and multi-lobed types, with flange connection and threaded connection.
The bottom valve is welded to the bottom of the container to achieve the best emptying, cleaning and disinfection effects. In addition, the working medium can be well mixed according to various process requirements during the operation. The tank bottom valve is as close as possible to the tank bottom wall to achieve the effect of no dead ends.
Most foot valves are fitted with inlet strainer, and they filter the incoming water and prevents the valve damage. Electric pumps are used to pump water from a lower level to higher level and this would require a lot of energy, the could flow back to the source from the higher level to the lower level if the pump is turned off the suction is gone and the water will flow in the reverse direction due to the gravity, it can be prevented by using foot valves.
Foot valves are used to prevent the backward flow of water through the pipe when the water pump is turned off, thus the column of the water in the pipe is maintained and all the issues are resolved. A foot valve is a kind of check valve, and they only open in one direction so the foot valves would only allow a unidirectional flow and it will close off when the direction of flow is reversed.
Foot valves are placed in the pick-up end of the pipe so they are located at the very bottom. In order to pick the water from a lower level pump is used and the pump will create suction and the water is pulled from the lower level, due to the upward pressure the foot valves open. When the pump is turned off the pulling force is removed and water will flow downwards due to the gravitational pull and foot valves blocks the downward flow of water. So the foot valve is a necessary part of the pumping system.
The bottom valve is equipped with multiple water inlets on the valve cover and is equipped with a screen to reduce the inflow of debris and reduce the chance of clogging of the bottom valve. Although the bottom valve is equipped with an anti-clogging screen, the bottom valve is generally suitable for clean media. It is not suitable to use the bottom valve for media with excessive viscosity and particle size. The bottom valve is welded to the bottom of the container to achieve the best emptying, cleaning and disinfection effects.
① The structure is ideal in terms of flow rate and process requirements. In addition, there will be no turbulence during emptying.
② The bottom valve has reasonable design, advanced manufacturing technology, and is convenient for installation, use and maintenance. It has low friction resistance and long service life.
③ The bottom valve can also mix the working medium well according to various process requirements during operation.
④ The tank bottom valve should be as close to the tank bottom wall as possible to achieve the effect of no dead ends.
⑤ According to the material, the bottom valve can be divided into plastic bottom valve and metal bottom valve. It can also be divided into ordinary bottom valve and bottom valve with backwash water flow.
⑥ The surface of the valve body can be mechanically polished or electropolished according to customer requirements, and the accuracy can reach 0.25um.
⑦ Each water pump must be equipped with a bottom valve. The bottom valve is usually installed below the water surface, while the above-water bottom valve is installed above the water surface. It is an updated product of the old-fashioned bottom valve. It is an ideal water diversion equipment and can also replace the vacuum pump. and vacuum device.
The bottom valve has reasonable design, advanced manufacturing technology, and is convenient for installation, use and maintenance. It has the advantages of small friction resistance, long service life, energy saving, etc., and is widely used in water pump supporting facilities in petrochemical, chemical, textile, printing and dyeing, metallurgy, mining, drainage and irrigation and other industries.
Before starting a non-self-priming centrifugal pump with a bottom valve, the pump must be filled with water before it can be started. The bottom valve is mainly used in non-self-priming centrifugal pump water pumping situations. It is installed at the bottom of the suction pipe and is completely submerged in the water.
The bottom valve has a check function. The water in the suction pipe can only flow toward the pump inlet and cannot return to the suction pool. Water needs to be filled when the pump is started for the first time, but it will not need to be filled in the future (in fact, due to the sealing and processing quality of the bottom valve problem, a certain amount of water needs to be added when starting again).
Check valves usually cannot withstand high pressure, but the water backflow on the outlet side after the pump is shut down will generate a lot of pressure. To prevent the bottom valve from being damaged, some bottom valves are equipped with a pressure relief pipe.
① First, remove the wooden support in the valve core before installation, otherwise it cannot be used.
② Installed at the bottom of the water pump suction pipe, the vertical position should be ensured during installation.
③ Start-up: When the forward water diversion pipe is filled with water for the first time, it starts immediately, causing a semi-vacuum state in the water suction pipe, and sucking water into the vertical pipe to complete the water pumping process.
④ Maintenance: Under normal circumstances, maintenance is not required for use. When maintenance is required, just open the middle opening of the bottom valve and replace the rubber gasket of the valve core. After maintenance, the pump will still be started according to the first startup method.
⑤ If used in fluids with high acid-base concentration, you may choose a stainless steel water-type bottom valve.
Normally utilized on Water supply systems within a water tank or a Water Pump system. (Project Reference : Water Tank for Fire Pump Room in Bangladesh)
① The water pump cannot discharge water. Check whether the bottom valve core support has been removed (remove the valve core support);
② Check whether there is air leakage at the water diversion pipe interface (seal the pipe interface);
③ Whether the water diversion pipe is filled with water before starting the pump (fill the pipe with water before starting the pump);
④ Check whether the water pump is reversed (correct wiring);
⑤ Check whether the water pump is leaking or whether the water pump is damaged (repair or replace the water pump).
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