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Expertise in Control Valve Engineering

Expertise in Control Valve Engineering
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Expertise in Control Valve Engineering - 1

Expertise in Control Valve Engineering SMART IN FLOW CONTROL.

Expertise in Control Valve Engineering - 2

Global presence with a local touch - SAMSON has enjoyed a history of growth for over a century. Shortly after the company was founded in 1907, SAMSON established partnerships with renowned trading houses in several European countries to efficiently market our products abroad. The formation of the Technical Sales Department in 1949 laid the foundations for the expansion of SAMSON's international sales and service network recognized for its expertise and efficiency. A strong partner - Today, SAMSON is a worldwide leader in the manufacture of expertly engineered control valves and accessories...

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Expertise in Control Valve Engineering - 4

CONTROL VALVES IN MODULAR DESIGN In any case Efficient solutions – SAMSON's expertise in control valve engineering covers all processes in industrial plants. Our extensive experience gained over the years from the design, development and manufacture of optimally engineered solutions serves as the basis for mastering new challenges. The wide range of products proven in practice can be customized in close cooperation with our customers to provide a commercially acceptable solution that meets the requirements of even the most complex applications. Modular design – With their flexible, modular...

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Expertise in Control Valve Engineering - 5

The right actuator – Pneumatic actuators with a rolling diaphragm and springs evenly arranged in the actuator case are made to precisely fit on valves over robust yokes, completing the compact design of our SAMSON control valves. The fail-safe action of SAMSON actuators can be reversed in the field, requiring no additional parts. The connector mechanism that fastens the actuator to the valve stem allows the travel and thrusts to be varied. Actuators with manual overrides ensure that the process can keep running in emergency mode, even in the event of a control signal or power supply...

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Efficient solutions Optimized to the max – Thanks to the modular design of our SAMSON control valves, their purchase price as well as the costs for energy, maintenance and repair incurred during the valve's entire service life are comparatively low. Especially when it comes to valves designed for critical media that consume a lot of energy, the purchase price accounts for only a fraction of the total cost of ownership. The modular valve design allows us to provide a large number of valve versions configured from a small number of components. The plugs designed for the smaller valve sizes of...

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Expertise in Control Valve Engineering - 7

The dimensions of the bellows and packings are identical up to DN 80. As a result, fewer spare parts have to be kept in stock despite the wide variety of KVS coefficients. True, a metal bellows costs more than a packing. But when the packing needs to be replaced for the first time, these extra costs will soon be forgotten in view of the considerable plant downtime caused. Often, an actuator with a greater actuating force is more expensive than a pressurebalanced solution. However, the more powerful actuator provides a lower hysteresis and leakage rate, and it may not be necessary to...

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PRESSURE LETDOWN IN GASES Low-noise operation Theoretical insights – When reducing the pressure in gases and vapors, the medium expands as it passes through the valve and reaches high flow velocities even at small pressure drops. As a result, a turbulent mixing zone is created downstream of the vena contracta where the pressure and density fluctuate considerably. As the differential pressure increases, the flow velocity may exceed the speed of sound at certain locations. This causes the turbulent mixing zone to be overlapped by shocks. This phenomenon exposes the valve components to extreme...

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Accurate noise calculations – SAMSON bases noise emission calculations on the internal sound power, which can be calculated using a theoretical formula and acoustical efficiency factors determined empirically. This method is used to precisely calculate noise transmission loss, the effect of insulation, noise emission at a remote location or when venting to the atmosphere. With the objective of improving existing standards and meeting customer requirements, we at SAMSON are constantly investing in our high-performance test rigs. Effective solutions – A control valve can be adapted to an...

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THROTTLING SERVICE WITH LIQUIDS Mastering cavitation Perfect solution – The cavitation factor xFz introduced by SAMSON in 1973 is the basis for international noise prediction standards and specifies at which pressure ratio cavitation starts. As a result of elaborate tests and calculations performed at SAMSON, the standard valves have been optimized to prevent cavitation by developing special plug designs and anti-cavitation trims with high xFz coefficients to keep the valves free of vibration and cavitation over the entire load range. Input pressure Multi-stage pressure letdown Pressure...

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For example, a seat-guided and shape-optimized parabolic plug with special flow contours and a raised seat yields the lowest possible pressure recovery. At high valve loads, the xFz coefficient can be further increased by using upstream attenuation plates to prevent cavitation. in any case, thanks to our modular valve design with flow coefficients determined over the entire travel range on in-house test benches as well as the SAMSON Valve Sizing software that takes into account the control loop behavior under all operating conditions. 15 Multi-stage plugs with double guiding sized to...

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Expertise in Control Valve Engineering - 12

MULTI-PHASE FLOWS Rugged and reliable Flow know-how – As there is no binding calculation standard, a high level of expertise is required when sizing valves intended to control multi-phase flows, e.g. a gas-liquid mixture. Special consideration must be given to the increase in volume and velocity that occurs during the expansion of the mixture as well as to the fact that the mixture has a lower sound velocity than its individual components. Thanks to our expertise, our SAMSON valves are ideally sized and produce non-choked flows, which prevent excessive mechanical stress on the valves....

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