7
ES-A-ACV-LF960GD-15-17 2115
© 2021 Watts
LEAD FREE
*
The Model 27 Altitude Pilot is a hydraulically operated, diaphragm
actuated, spring loaded 3-port pilot designed to open or close
based upon static tank head pressure versus an adjustable spring
setting. It directly monitors tank head pressure by a contractor
field installed Sensing Line. The large diaphragm area causes the
Model 27 to be sensitive to slight changes in tank head pressure.
The Model 27 Altitude Pilot works in conjunction with a 3-Way
Accelerator Pilot (Model 22 or Model 22-1) to open and close the
Main Valve.
As water level decreases, the sensed tank head pressure falls
below the control setpoint of the Model 27, causing it to pressur-
ize the cover of the 3-Way Accelerator, allowing the Main Valve to
open for filling operations. The valve will either open fully or regu-
late to fill the tank based upon the pilot control system installed on
the Main Valve.
As water level increases, the sensed tank head pressure increas-
es above the control setpoint of the Model 27, causing it to de-
pressurize the cover of the 3-Way Accelerator, closing the Main
Valve.
Turning the Adjusting Screw clockwise increases the control set-
ting, increasing tank level. Turning the Adjustment Screw counter-
clockwise lowers the control setting, decreasing tank level.
The Model 27 may be equipped with an optional Altitude Gauge
or Delayed Opening Pilot in the sensing line to allow for increased
tank turn-over. Consult your factory representative for details.
Model 27
Altitude Pilot
Size:
1/8
" NPT Actuation Ports (
1/4
" NPT Sense
Line Port)
* The wetted surface of this product contacted by consumable
water contains less than 0.25% of lead by weight.
Specifications
Body:
Brass Alloy C46500 (standard)
Stainless Steel (optional)
Adjustment Spring:
Steel
Adjustment Range:
5-20 feet (2 - 6 meters)
10-75 feet (3 - 23 meters)
50-225 feet (15- 69 meters)
Elastomers:
Buna-N
(standard)
EPDM
(optional)
3.5 in / 89.5 mm
13.5 in / 345 mm
7.68 in / 195.15 mm
2.88 in / 73.36 mm
2.5 in / 38.27 mm
Model LF27
