The Model FP 450-66 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.
The Model FP 450-66 is a float controlled valve equipped with a 4-way, “last position”, bi-level float pilot assembly.
The float  slides along the rod . When the float reaches either the adjustable high  or low  level stoppers, it either pulls the rod assembly down or pushes it up, switching the float pilot  position. When the float is between the adjustable stoppers, the main valve remains in its last position.
At high level, the float pilot applies pressure to the control chamber , powerfully shutting off the main valve. At low level, the float pilot vents the control chamber, powerfully opening the main valve. For 8” valves and larger, an accelerator  quickens valve response.
The Level Control Valve shall hydraulically open at a pre-set low level, and close at a pre-set high level. Main Valve: The main valve shall be an elastomeric type globe (or angle) valve with a rolling-diaphragm. The valve shall have an unobstructed flow path, with no stem guide or supporting ribs. The body and cover construction material shall be ductile iron. All external bolts and nuts shall be of stainless steel 316. All valve components shall be accessible and serviceable without removing the valve from the pipeline. Actuation: Valve actuation shall be accomplished by a fully peripherally supported, single piece, balanced rolling-diaphragm, vulcanized with a rugged radial seal disk. The diaphragm assembly shall be the only moving part.
The assembled valve shall be hydraulically tested. Quality Assurance: The valve manufacturer shall be certified according to the ISO 9000 and 9001 Quality Assurance Standard.
Rooftop reservoir level control is attained by electric control of the basement pumps according to reservoir level. As overflow of a rooftop reservoir can cause costly damage, hydraulic backup protection is recommended. The Model FP 450-66 is suited to this function. When open, it presents minimal interference, but when needed, it shuts off securely. To ensure supply pressure to upper floor consumers or the fire protection system, install the Model FP 420 or 42T Pressure Control Valve upstream from the Model FP 450-66.
Basement reservoir design requires consideration of specific issues:
The Model FP 450-66, as part of a Reservoir Fill-Up system, fulfills these requirements and more.