The Level Control Valve with Bi-Level Vertical Float is a hydraulically controlled, diaphragm actuated control valve that controls reservoir filling in response to a hydraulic on/off float pressure command. The Valve opens at pre-set low level and closes at a pre-set high level
It is a float-controlled valve equipped with a “last position” two-way floating pilot assembly. The float  slides along the rod . When the float reaches the high adjustable level stops  or low , pull the bar assembly down or push it up, changing the position of the float pilot . When the float is between the adjustable stops, the main valve remains in its last position. At the high level, the float pilot applies pressure to the control chamber , powering off the main valve. At low level, the float pilot ventilates the control chamber, opening the main valve powerfully. For valves 8 “or larger, an accelerator  accelerates the response of the valve.
Typical Applications of Level Control Valve with Bi-Level Vertical Float
The control of the level of the deposit in the roof is achieved by means of the electrical control of the pumps of the basement according to the level of the deposit. As the overflow of a rooftop deposit can cause costly damage, hydraulic backup protection is recommended. The level control valve with two-level vertical float is suitable for this function. When open, it presents minimal interference, but when necessary, it shuts down safely
Basement reservoir design requires consideration of specific issues:
- Supply cut-off is unacceptable.
- Reservoir overflow might damage expensive equipment.
- Noise level and duration should be limited.
- Municipal supply pressure might be low.