German Rotelmann valves Rotelmann models Rotelmann prices

Rotelmann valves are valves in which the closing element (ball) is driven by the valve stem and rotates around the ball valve axis. They can also be used for fluid regulation and control. Among them, hard-sealed V type ball valves have strong shear force between the V type ball core and the metal valve seat surfacing with hard alloy, making them particularly suitable for media containing fibers, small solid particles, etc. Multi-port ball valves on pipelines can not only flexibly control the confluence, diversion, and switching of flow direction of the medium, but also close any channel to connect the other two channels. This type of valve should generally be installed horizontally in pipelines. Ball valves are classified by actuation method into: pneumatic ball valves, electric ball valves, and manual ball valves.

Rotelmann 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 significant role in the national economy. They have a rotating action of 90 degrees, with the plug being a sphere that has a circular through-hole or passage along its axis. Ball valves are mainly used in pipelines for cutting off, distributing, and changing the flow direction of the medium. They only require a rotation of 90 degrees and very small torque to achieve tight closure. Ball valves are most suitable for use as on-off and cut-off valves, specifically V type ball valves. In addition to paying attention to pipeline parameters, special attention should be paid to the environmental conditions for electric valves, since the electric device in an electric valve is an electromechanical component whose operating status is greatly affected by the environment. Under normal conditions, special care must be taken when using electric ball valves and butterfly valves in the following environments. [1]

Rotelmann valve sealing requirements

The sealing performance of a valve refers to the ability of its various sealing parts to prevent medium leakage, which is the most important technical performance indicator of a valve. There are three sealing locations in a valve: the contact area between the two sealing surfaces of the closing element and the valve seat; the mating area between the packing, the valve stem, and the stuffing box; and the connection area between the valve body and the bonnet. Leakage at the first location is called internal leakage, commonly known as incomplete closure, which affects the valve's ability to cut off the medium. For shut-off valves, internal leakage is not allowed. Leakage at the latter two locations is called external leakage, i.e., medium leaking from inside the valve to the outside. External leakage causes material loss, pollutes the environment, and may even cause accidents in severe cases. For flammable, explosive, toxic, or radioactive media, external leakage is strictly prohibited; therefore, valves must have reliable sealing performance.

Rotelmann valve structure

Good sealing performance, but the load of the working medium on the ball is entirely transmitted to the outlet sealing ring. Therefore, it is necessary to consider whether the sealing ring material can withstand the working load of the ball medium. Under high pressure impact, the ball may shift. This structure is generally used for medium and low-pressure ball valves. Valve fixed ball valve Valve fixed ball valve The ball of the fixed ball valve is fixed and does not move under pressure. Fixed ball valves are equipped with floating valve seats. Under medium pressure, the valve seat moves, pressing the sealing ring tightly against the ball to ensure sealing. Bearings are usually installed on the upper and lower shafts of the ball, resulting in low operating torque, making them suitable for high-pressure and large-diameter valves. To reduce the operating torque of ball valves and increase sealing reliability, oil-sealed ball valves have been developed. Special lubricating oil is injected between the sealing surfaces to form an oil film, which enhances sealing and reduces operating torque, making them more suitable for high-pressure, large-diameter ball valves.

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