German PRATISSOLI valves PRATISSOLI models PRATISSOLI prices

PRATISSOLI valves are valves in which the closing element (ball) is driven by the valve stem and rotates around the axis of the ball valve. 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 overlaid with hard alloy, making them particularly suitable for media containing fibers, small solid particles, etc. Multi-port ball valves can not only flexibly control the confluence, diversion, and direction switching of the medium in pipelines, 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 drive method into: pneumatic ball valves, electric ball valves, and manual ball valves.

PRATISSOLI valve industry applications

Ball valves are widely used in industries such as oil refining, long-distance pipelines, chemical engineering, papermaking, pharmaceuticals, water conservancy, electric power, municipal administration, and steel, occupying a pivotal position in the national economy. They feature a 90-degree rotational action, with a spherical plug having 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 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 cut-off valves, specifically 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 significantly affected by the environment. Typically, special care is required when using electric ball valves and butterfly valves in the following environments. [1]

PRATISSOLI 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 areas in a valve: the contact area between the sealing surfaces of the closing element and the valve seat; the mating area between the packing, valve stem, and packing gland; and the connection area between the valve body and valve cover. Leakage in the first area is called internal leakage, commonly referred to as incomplete closure, which affects the valve's ability to cut off the medium. For cut-off valves, internal leakage is not allowed. Leakage in the latter two areas 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 lead to accidents in severe cases. For flammable, explosive, toxic, or radioactive media, external leakage is strictly prohibited; therefore, valves must have reliable sealing performance.

PRATISSOLI valve structure

Good sealing performance, but the load of the working medium on the ball is entirely transmitted to the outlet sealing ring. Therefore, consideration must be given to whether the sealing ring material can withstand the working load of the medium on the ball. 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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