Page 12 - Fluid & Air Buyers Guide 2023

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Drallim Rotary Selector Valve (RSV) is a Flexible Solution for Process Control
The Rotary Selector Valve or RSV is a multiport, sprung loaded poppet valve, driven by a stainless steel profiled internal cam (spindle), with each port configurable in multiple banks. It stacks allowing different fluids to pass through each bank, in a variety of sequences, with indexing, key locks, actuation, switch outputs and a host of other options.
Used in small bore piping systems in the range -1bar to 10bar it is a simple and extremely reliable unit, of modular design, configurable for a multitude of applications. Available in both brass and stainless steel, with stem and seal materials chosen to suit the process media.
In complex pneumatic control systems for high integrity applications, it eliminates the cross-port leakage issues found with multiport ball valves. Also used in hydraulic applications such as drain and purge, or hydraulic actuation and many other control applications, where process sequences and interlocking
can be easily configured in one device, providing a highly adaptable solution to a wide range of fluid control applications.
When being used in processing plants, where the flow is controlled by in-line valves, pneumatic control of the actuators that open or close is achieved using electrical solenoid valves, that, in turn, pressurise or vent the actuators. As an emergency safety feature or to carry out planned maintenance, it is necessary to by- pass those solenoids and using an RSV enables a manual override.
Single acting actuators (spring return) are controlled by a single pneumatic signal and are bypassed using a single bank RSV, having one airpath.
Double acting valves require one side to be pressurised with the other vented, employ a two-bank.
Multiple actuators can be controlled by a single RSV, the series 40 having up to eight separate banks.
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FLUID&AIR DIRECTORY 2023
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