Cla-Val Models 210-27 and 610-27 Altitude Valves control the high water level in reservoirs without the need for floats or other devices. They are non-throttling valves that remain fully open until the solenoid is activated or the shut-off point of the hydraulic pilot control is reached. The valves close at a high water level and open for return flow when the pressure at the valve inlet is less than reservoir pressure.

Used on reservoirs where water is withdrawn through the Altitude Valve. The valve closes at the high water level and opens for return flow when the pressure.