La T.I.S. Service S.P.A. products

Water supply and distribution, waste water treatment and sewerage.

Pumping stations, treatment plants, reservoirs, desalination plants, industrial applications.

The needle-valve is mainly designed for the water flow regulation in a pipeline. The flow regulation happens through the axial movement of a piston, operated by a rod and crank mechanism.The piston is positioned in the center of the body valve and steers in a chamber properly shaped in order to avoid noises and cavitations damages. This characteristic confers to the valve regular operation free from vibrations.The water flow is guided in a annular chamber around the streamlined central body. The cross section of this chamber is continuously reducing from inlet to the throttle. This causes continuous rises of flow speed and fall of the pressure. The geometrically ideal design, confines the cavitations bubbles in the center of the outlet mouth, avoiding damages to the valve.The regulation happens with high head loss, when the valve is open less than 40%, and very low head loss, when the valve is open more than 50%.

3 - phase squirrel cage electric motor 380V, 50 Hz (short time duty S2-15 min), insulation class F, with 3 thermo-switches placed in the windings and internal plug and socket connection between motor and actuator housing. Enclosure of actuators IP 67 according to ISO 40050 / IEC 529-EN 60529-dust and water tight. Actuators are suitable for service at ambient temperature from -25°C to +80°C. Easily adjustablecounter gear limit switching for end position CLOSE/OPEN. Mechanical position indicator. Limit switching with 2 switches (each direction 1 NC + 1 NO contacts), switch enclosure IP 66. Infinitely adjustable torque switching for closing and opening direction at calibrated torque dial, adjusted torque value indicated in da Nm. Torque switching with 2 switches (each direction 1 NC + 1 NO contacts), switch enclosure IP 66. Output speeds from 4...90 1/min. Paint standard “KN” Auma Ral 9007.