German hilma-roemheld valves hilma-roemheld models hilma-roemheld prices

hilma-roemheld valve is a valve whose closing element (ball) is driven by the valve stem and rotates around the axis of the ball valve. It can also be used for fluid regulation and control. Among them, the hard-sealed V type ball valve has strong shear force between its V type ball core and the metal valve seat with hardfaced cemented carbide, making it particularly suitable for media containing fibers, fine 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 according to the driving method into: pneumatic ball valves, electric ball valves, manual ball valves.

hilma-roemheld valve industry applications

Ball valves are widely used in petroleum refining, long-distance pipelines, chemical industry, papermaking, pharmaceuticals, water conservancy, power generation, municipal engineering, steel industry, etc., playing a significant role in the national economy. They have a rotation 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 require only a 90 degree rotation operation and minimal torque to achieve tight shutoff. Ball valves are most suitable as on-off and cutoff valves, specifically V type ball valves. In addition to pipeline parameters, special attention should be paid to the environmental conditions when using electric valves, as the electric devices within them are electromechanical components whose operational status is greatly affected by their environment. Typically, electric ball valves and butterfly valves require particular attention under the following conditions. [1]

hilma-roemheld valve sealing requirements

The sealing performance of a valve refers to its ability to prevent leakage at various sealing points, which is the most critical technical performance indicator. There are three main sealing areas: the contact area between the closure member and the valve seat; the fit between the packing and the valve stem and stuffing box; and the connection between the valve body and bonnet. Leakage from the first area is called internal leakage, commonly referred to as incomplete closure, affecting the valve's ability to cut off the medium. For shut-off valves, internal leakage is unacceptable. Leakage from 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 lead to accidents in severe cases. For flammable, explosive, toxic, or radioactive media, external leakage is strictly prohibited, thus requiring reliable sealing performance from the valve.

hilma-roemheld valve structure

Good sealing performance, but all working medium load on the ball is transferred to the outlet seal ring, so consideration must be given to whether the seal ring material can withstand the working load of the ball medium. Under high-pressure impact, the ball might shift. This structure is typically used in medium and low-pressure ball valves. Fixed ball valve Fixed ball valve The ball in a fixed ball valve remains stationary under pressure. Fixed ball valves come with floating seats that move under medium pressure, pressing the seal 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, suitable for high-pressure and large-diameter valves. To reduce operating torque and enhance sealing reliability, oil-sealed ball valves have been developed. Special lubricating oil is injected between the sealing surfaces to form an oil film, enhancing sealing and reducing operating torque, making them more suitable for high-pressure, large-diameter ball valves.

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