overview
Each water pump needs to be equipped with a bottom valve, which is usually installed below the water surface, while the above water bottom valve is installed above the water surface.
The water-based bottom valve was designed by a professional design institute of the Ministry of Railways. It passed the ministerial level appraisal in 1985 and won the Science and Technology Progress Award of the Ministry of Railways in 1986. It has been included in the ninth volume of the "Water Supply and Drainage Design Manual". In 1994, it was rated as an excellent energy-saving product by the Resource Conservation and Comprehensive Utilization Department of the National Economic and Trade Commission, the Transportation and Energy Department of the National Planning Commission, and the Industrial Science and Technology Department of the National Science and Technology Commission. The bottom valve has a reasonable design, advanced manufacturing technology, simple installation, convenient use and maintenance, and has the advantages of low friction resistance, long service life, and energy saving of 5-7%. It is an upgraded product of underwater bottom valve. Widely used as a supporting water pump in industries such as petroleum, OEM, textile, printing and dyeing, metallurgy, mining, and irrigation.
characteristic
When used as a bottom valve, it can replace an underwater bottom valve and be installed 90 degrees above the water surface in horizontal pipes and inlet risers^oJust turn around.

When used as a check valve, it can be installed at 90^oChanging the head can replace the elbow and take up less space. It also serves as a check function, with unique sealing performance and a check effect that can prevent water leakage. There is no damping device, which has a certain mitigating effect on water hammer hazards.
3. The energy-saving effect is significant, which can save about 5-7% of energy during normal operation and use (according to the power consumption of thousands of tons/meter), reducing the cost of water supply operation. After six months of use, the saved electricity cost can recover the investment cost of the valve you purchased, and its energy-saving effect cannot be achieved by the bottom valve.
4. The connection method of this product complies with international regulations and has good ventilation performance.
instructions
1. Specifications DN50、DN65、DN80、DN100、DN150、DN200、DN250、DN300、DN350、DN400、DN500、Dg600、Dg700、Dg800 Waiting for 14 varieties.
2. Nominal pressure: 6Kgf/cm
3. Installation requirements: Install at the 90o bend between the vertical pipe and the horizontal pipe of the water pump suction pipe, and ensure its condition during installation.

4. Start: Before the first start, fill the horizontal pipe of the suction pipe with water on the water pump to measure the water capacity of the horizontal pipe section. Then start immediately to create a semi vacuum state in the vertical pipe of the suction pipe, and suck water into the solid pipe to complete the pumping process. If the suction stroke is too large, repeat the water filling process several times. After stopping the pump, there is no need to fill water when starting it.

5. Maintenance: In general, maintenance is not necessary for use. When maintenance is needed, simply open the valve cover on the water type bottom valve and replace the rubber gasket on top. After maintenance, start the pump according to the first start method.