Si-108 EN
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Datasheet Ball segment valve - Low noise design (LN) Si-108 EN Edition: 2010-04 Type KVTW LN / KVXW LN Wafer design Type KVTF LN / KVXF LN Flanged design Nominal pressure PN 20 - 50 Nominal size DN 50 - 250 (W) DN 50 - 400 (F) Material Stainless steel • Low noise level • Control and shut-off valve • One-piece shaft gives a torque transmission free of backlash • Excellent tightness irrespective of differential pressure • Easy maintenance The SOMAS ball segment valve types KVTW LN and KVTF LN, with centrically mounted shaft and KVXW LN and KVXF LN with eccentrically mounted shaft, are designed to reduce noise. KVTW LN and KVXW LN are of wafer design while KVTF LN and KVXF LN are flanged valves. The valve body is of one-piece design. The shaft device is also in one piece for torque transmission free of backlash. The spring-loaded seat is available in three alternative materials (PTFE, PTFE 53 and HiCo). Noise reduction is achieved through a low noise trim. This trim is mounted directly to the segment and consists of a number of bars located in a specific pattern that are used to split up the pressure drop across the valve. This results in less pressure recovery, thereby reducing the noise and potential damage due to cavitation. In addition the “LN” trim can tolerate media containing a small amount of fibers or particles. The SOMAS valves are delivered ready for installation and operation. The valve assemblies are delivered factory tested as complete units with actuators, positioners and accessories.

Edition: 2010-04 Si-108 EN PVC PVC Background Within the process industry and the energy sector there are a number of applications where process data in combination with standard control valves will result in problems such as erosion and high noise level. These problems are usually related to high flow velocities and/or pressure drops within the valve caused by the severe nature of a given process’s requirement. P1 P1 By using a standard ball segment valve and adding the SOMAS noise reduction device to its segment, many severe noise-producing applications can be solved. P2 P2 Pressure...

Si-108 EN Edition: 2010-04 Pressure Velocity Fig. 2 Liquid Vapour Pressure Pressure and velocity variations with noise reduction trim. Compare with Fig. 1. Principal sketch Valve description SOMAS ball segment valves type KVTW LN and KVXW LN are derivatives of the SOMAS standard models KVTW and KVXW. The designation “LN” indicates that the ball segment is equipped with a low noise trim, which is used to split up the pressure drop across the valve. This results in less pressure recovery, thereby reducing the noise and potential cavitation damage normally generated in standard ball segment...

Edition: 2010-03 Si-108 EN Further technical information Actuators and accessories See the data sheets Si-101, Si-108 and Si-111 for flange standard, technical information and dimensional drawings. See the selection tables in the data sheets Si-101, Si-108 and Si-111. Manually operated actuators are NOT available for LN-valves. Valve sizing Use SOMAS valve sizing program SOMSIZE to find the correct valve size. All sizing factors are included in the program. Ordering State desired valve according to the valve specification system below as well as type of actuator, positioner and accessories....