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Piston valves are undetected and yet the best solution to avoid any maintenance or leakage on a flow / hot water / thermal oil line.
Shut-off valves are designed to close the medium flow. In the version with control discs is also the throttling of the Medium flow possible. They can be placed in any position in the pipeline can be installed.
Ball valves are manufactured with a full flow body so that the product can flow through the valve without restrictions and with minimal pressure drop.
Check valves manufactured in many different configurations to limit space, reduce noise, maximize flow rate, avoid water hammer, see through...