German Danfoss Scola valves, Danfoss Scola models, Danfoss Scola prices

With a constant pressure differential across the Danfoss Scola valve, the flow rate of a standard valve changes little when the opening varies over a wide range. However, at a certain opening, the flow rate changes sharply, indicating poor regulation performance. A control valve adjusts the valve core stroke according to the direction and magnitude of the signal, thereby changing the valve's resistance coefficient to achieve flow regulation. Control valves are divided into manual and automatic types. Manual and automatic control valves come in many varieties with different regulation performances. Automatic control valves include self-acting flow control valves and self-acting differential pressure control valves.

Danfoss Scola valve connection method: threaded connection

This is a simple connection method, commonly used for small valves. It is divided into two cases: 1) Direct sealing: internal and external threads directly provide the sealing effect. To ensure no leakage at the connection, lead paste, hemp fiber, and PTFE raw tape are often used for filling; among these, PTFE raw tape is increasingly widely used. This material has excellent corrosion resistance and superior sealing performance, is easy to use and store, and can be removed intact during disassembly because it is a non-adhesive film, making it far superior to lead paste and hemp fiber. 2) Indirect sealing: the tightening force of the thread is transmitted to the gasket between the two planes, allowing the gasket to provide the sealing effect.

Danfoss Scola valve sealing requirements

Valve sealing performance refers to the ability of various sealing parts of the valve to prevent medium leakage. It is the most important technical performance indicator of a valve. There are three sealing locations in a valve: the contact area between the closing member and the two sealing surfaces of 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 valve cover. 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, where the medium leaks from inside the valve to the outside. External leakage causes material loss, environmental pollution, 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.

Danfoss Scola valve advantages

The electric ball valve structure consists of only a few components, saving material usage; it features small volume, light weight, and compact installation dimensions. As shown in the electric ball valve structure diagram, it requires low driving torque. As a pressure control valve, it is easy and agile to operate, requiring only a 90° rotation for quick opening and closing. It also offers good flow regulation efficiency and tight sealing characteristics. In applications involving large and medium diameters and medium to low pressures, the electric ball valve is the dominant valve type. When the electric ball valve is fully open, the disc thickness is the resistance to the medium flowing through the valve body, resulting in a very small pressure drop, thus providing good flow control characteristics. Electric ball valves have two sealing types: elastic sealing and metal sealing. For elastic sealing valves, the sealing ring can be embedded in the valve body or attached to the periphery of the disc. Valves with metal sealing generally have a longer service life than those with elastic sealing, but it is difficult to achieve complete sealing. Metal sealing can adapt to higher operating temperatures, while elastic sealing has the disadvantage of being limited by temperature. If an electric ball valve is required for flow control, it is important to accurately select the valve size and type. The structural principle of the electric ball valve is particularly suitable for manufacturing large-diameter valves. Electric ball valves are not only widely used in general industries such as petroleum, gas, chemical, and water treatment, but also in the cooling water systems of thermal power plants. Common electric ball valves include wafer-type and flanged-type electric ball valves. Wafer-type electric ball valves connect the valve between two pipe flanges using double-headed bolts. Flanged electric ball valves have flanges on the valve, connecting the flanges at both ends of the valve to the pipe flanges using bolts. Valve strength performance refers to the valve's ability to withstand medium pressure. As a mechanical product subjected to internal pressure, the valve must have sufficient strength and stiffness to ensure long-term use without rupture or deformation. A pneumatic ball valve consists of a ball valve equipped with a pneumatic actuator. Pneumatic actuators are divided into double-acting and single-acting types. Controlled by solenoid valves, they realize the switching action of the ball valve. Pneumatic ball valves enable intelligent control, quickly opening or closing pipelines, and effectively controlling and managing the pipeline network.

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