İĞNE (PLUNGER) ÇEK VANA

CELEKS The needle valve is able to modulate the flow-rate of water while providing gradual operation even when large reductions in flow and high headlosses are needed. The possibility of using actuators with a continuous regulation scale allows the use of control systems to provide multiple functions.

The needle valve controls the water flow through the axial movement of a shutter operated by connecting-rod and crank mechanism.

The shutter runs in a pressure-compensated chamber specially shaped to avoid vibrations and anomalous hydrodynamic loads.

Closure is in the flow direction, so as the speed of the fluid (or the pressure difference) increases, the system tends to become even more stable.

The internal profile of the valve is designed to minimize cavitation. The flow of water is channelled into round-section passage which gradually becomes narrower from the intake to the sealing seat.

The hydrodynamic profile of the passage is optimised throughout the part where the water speed gradually rises, and allows pressure drops to be kept low for opening above 40%.