German DANFOSS valves DANFOSS models DANFOSS prices

DANFOSS valves are used to prevent media backflow, opening automatically using the fluid's own kinetic energy and closing automatically during reverse flow. They are commonly installed at pump outlets, steam trap outlets, and other locations where reverse fluid flow is not permitted. Check valves are classified into swing type, lift type, and wafer type. For swing check valves, fluid can only flow from left to right, and they close automatically during reverse flow. For lift check valves, when fluid flows from left to right, the valve core lifts to form a passage; during reverse flow, the valve core is pressed onto the valve seat and closed. For wafer check valves, when fluid flows from left to right, the valve core opens to form a passage; during reverse flow, the valve core is pressed onto the valve seat and closed. Wafer check valves allow multi-position installation, have small volume, light weight, and compact structure.

DANFOSS valve industry applications

Ball valves are widely used in oil refining, long-distance pipelines, chemical industry, papermaking, pharmaceuticals, water conservancy, electric power, municipal engineering, steel, and other industries, playing a pivotal role in the national economy. They feature a 90-degree rotational action, with a spherical plug body having a circular through-hole or passage along its axis. Ball valves are mainly used in pipelines for shut-off, distribution, and changing the flow direction of the medium. They require only a 90-degree rotation and minimal torque to achieve tight shut-off. Ball valves are most suitable for use as on/off and shut-off valves, V type ball valves. In addition to pipeline parameters, special attention should be paid to the environmental conditions for electric valves, as the electric actuator in an electric valve is an electromechanical device whose operating status is greatly affected by the environment. Typically, special care is required when using electric ball valves and butterfly valves in the following environments. [1]

Precautions for DANFOSS valve performance testing

1) When valves of a specific specification are manufactured in batches, an official agency should be commissioned to perform the following performance tests: (1) opening and closing torque of the valve under working pressure conditions; (2) flow resistance coefficient of the valve under pipeline water transmission conditions. 2) The following tests should be performed on valves before factory release: (1) with the valve in the open position, the valve body shall withstand an internal pressure test at twice the valve's working pressure; (2) with the valve in the closed position, both sides shall separately withstand 11 times the valve's working pressure without leakage; however, for metal-sealed butterfly valves, the leakage value shall not exceed relevant requirements.

DANFOSS valve installation precautions

Butterfly valves have a simple structure, small volume, and light weight, with relatively few components; just a few key parts constitute the butterfly valve. Opening is very convenient, requiring only turning the switch to ninety degrees. Butterfly valves provide excellent control over fluids, allowing flow rate to be increased or decreased at any time. Valves always present some resistance when transporting any fluid, and the resistance of a butterfly valve mainly comes from itself, such as the thickness of the butterfly valve body. To reduce fluid resistance, one only needs to reduce its thickness. Elastic seals have the disadvantage of being limited by temperature. The application range of butterfly valves is also quite wide. If used for flow control, different types and valve body sizes must be selected, as butterfly valves are inherently suitable for larger diameters during design. Butterfly valves are not only widely used in general industries such as petroleum, gas, chemical, and water treatment, but are also applied in cooling water systems of thermal power stations.

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