Germany velleman valve velleman model velleman price

velleman valves are used to prevent backflow of the medium, opening automatically using the kinetic energy of the fluid itself and closing automatically during reverse flow. They are commonly installed at the outlet of water pumps, the outlet of steam traps, and other locations where reverse fluid flow is not permitted. Check valves are classified into three types: swing check, lift check, and wafer check. For swing check valves, the fluid can only flow from left to right; they close automatically during reverse flow. For lift check valves, when the fluid flows from left to right, the valve core lifts to form a passage; during reverse flow, the valve core is pressed against the valve seat and closed. For wafer check valves, when the fluid flows from left to right, the valve core opens to form a passage; during reverse flow, the valve core is pressed against the valve seat and closed. Wafer check valves allow for multi-position installation, have a small volume, are lightweight, and feature a compact structure.

velleman valve industry applications

Ball valves are widely used in industries such as petroleum refining, long-distance pipelines, chemical engineering, papermaking, pharmaceuticals, water conservancy, electric power, municipal engineering, and steel, playing a pivotal role in the national economy. It features a rotation of 90 degrees, 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 can be tightly closed with only a 90-degree rotation operation and minimal torque. Ball valves are most suitable for use as on-off and shut-off valves, V type ball valve. In addition to paying attention 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 attention is required for the use of electric ball valves and butterfly valves in the following environments. [1]

velleman valve performance testing precautions

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) Detection of the flow resistance coefficient of the valve under pipeline water transmission conditions. 2) The following tests should be performed on valves before factory shipment: (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 the relevant requirements.

velleman valve installation instructions

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 fluid flow, 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 need to be selected, as butterfly valves are inherently more suitable for larger diameters during design. Butterfly valves are not only widely used in general industries such as petroleum, gas, chemical engineering, and water treatment, but are also applied in cooling water systems of thermal power stations.

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