Level Control Valve with Altitude Pilot PC10-FP-450-82
Features and Benefits
Line-pressure driven
❑ Independent operation
No Float
❑ Simple installation
❑ Easy accessibility
Rugged Reliability
❑ Single-piece fully supported rolling diaphragm
❑ Obstacle-free unobstructed flow path
Hydraulically Restrained Actuation
❑ Non-slam closing
❑ Quiet and smooth operation
High Performance
❑ High flow capacity
❑ low pressure operation
External Installation
❑ Easy access to valve
❑ Simple level setting
❑ Less wear and tear
In-Line Serviceable
❑ Quick and easy maintenance
Flexible Design
❑ Simple addition of factory supplied features
■ “Always Full” Firewater Reservoir
■ Ideal for High level reservoirs & water towers
■ Safer firewater filling
■ Self operation with No Float
■ Suitable for horizontal or vertical installation
Major Additional Features
Standard: 2-14 meter Setting Altitude Pilot – PC10-FP-450-82-M6
5-22 meter Setting Altitude Pilot – PC10-FP-450-82-M5
15-35 meter Setting Altitude Pilot – PC10-FP-450-82-M4
25-70 meter Setting Altitude Pilot – PC10-FP-450-82-M8
Pressure sustaining (for 450-82) – 453-82
The BERMAD PC10-FP-450-82 Level Control Valve is a hydraulically controlled, diaphragm actuated automatic control valve that shuts at pre-set high reservoir level and opens in response to level drop, keeping the reservoir full. The water level is maintained by the use of a highly accurate pilot valve. The pilot valve senses the water level head from a sensing point at the bottom of the reservoir and controls the main filling valve accordingly. This eliminates the need for the installation of a float mechanism, making it ideal for high level reservoirs.
Operation
The Model PC10-FP-450-82 is a pilot controlled valve equipped with an adjustable, #82 altitude pilot valve. The pilot valve senses the static head of the reservoir level via a sensing tube [1] connected to a “still point” at the bottom of the reservoir. Should the water level head rise to that equaling the setting of the pilot valve [2] the pilot valve will close, thereby allowing valve inlet water pressure to accumulate in the main valve control chamber [3] via the adjustable needle valve [5], causing the main valve to close drip tight. Should the Water Level head fall below the pilot valve setting, the pilot valve will open releasing pressure from the main valve control chamber, causing it to open and to fill the reservoir. As the water level in the reservoir approaches the pre-set full level the pilot starts to modulate causing the main valve to throttle in a controlled manner and close drip tight. The adjustable pilot needle valve [5] ensures a smooth operation of the main valve by regulating the closing speed. The test valve [6] enables manual opening of the main valve.
Engineer Specifications
The Level Control Valve shall shut at pre-set high reservoir level and open in response to a level drop, as sensed by the #82 high sensitivity altitude pilot valve mounted on the main valve. Main Valve: The main valve shall be an elastomeric globe type 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.
Control System: The control system shall consist of a #82, altitude pilot valve with a covered, centered spring and 8” (200 mm) sensing diaphragm, an isolating ball valve, Y control filter and adjustable closing speed control needle valve. All fittings shall be of stainless steel 316. 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.
Typical Applications
The Model PC10-FP-450-82 senses the static head of the water level in the tank by means of a high sensitivity altitude pilot valve. To do so accurately, the sensing tube end must be connected to a “still point” at the bottom of the tank. The drainage pipe provides this “still point”, a location not influenced by flow velocity from the filling and outflow pipes.
In firewater reservoirs, the water level should be kept as constant as possible, with a highly accurate altitude pilot valve the Model PC10-FP-450-82 is well suited to fulfill this requirement. The altitude pilot is highly sensitive to changes and accurately maintains the reservoir water level at no more than approximately 30cm or 1ft below the set level.
