Singer 106-A-Type 3 Installation, Operating And Maintenance Instruction

Altitude Valve, Two-Way Flow with Differential Control Schematic A-0414D

DESCRIPTION:

Model 106/206-A Type 3 controls water level in elevated
tanks, stand pipes and storage reservoirs. The valve
senses the hydrostatic head of the reservoir to close on
high water level. When the supply pressure drops a
preset amount below the high water level, the valve
opens for return flow.

DESCRIPTION OF OPERATION:

When the bonnet (top of diaphragm) is vented to
atmosphere, Main Valve (1) opens fully. When the inlet
pressure is directed to the bonnet, the Main Valve
closes. Refer to 106/206-PG 'Description of Operation'.
When the reservoir head is high enough to overcome
the spring force of Altitude Pilot (12), Pilot (12) connects
port 'K' to port 'X'. This connects the inlet pressure of
Main Valve (1) to its bonnet and closes the Main Valve.
Closing speed is determined by the setting of Closing
Speed Control (5).
Differential Relief Pilot (6) senses the pressure (head)
difference between the reservoir and the supply. When
the supply pressure drops enough to open Differential
Relief Pilot (6), Pilot (6) opens and drops the sensing
pressure of Altitude Pilot (12). Pilot (12) opens port 'K'
to drain (port 'E') and opens Main Valve (1) to allow flow
from the reservoir to the system.

INSTALLATION:

1. Refer to 106/206-PG 'Installation'.
2. Note the arrow cast on the side of Main Valve (1).
Install the valve with the arrow pointing
.
THE RESERVOIR
3. Connect pilot sensing line to reservoir as shown on
schematic A-0414D. For best control, the sensing
line should be connected directly to the reservoir. If
this is inconvenient, it may be possible to connect to
the pipe between the valve and the reservoir.
4. Connect pilot exhaust to drain. It is recommended
that the pilot exhaust be connected in a manner that
makes the flow visible. This helps in adjusting the
pilot.
5.
PRESSURIZE THE VALVE SLOWLY
the bonnet of the Main Valve by using the valve on
top of the Position Indicator.
SINGER MODEL 106/206-A-Type 3
Installation, Operating and Maintenance Instructions
TOWARDS
and vent air from

ADJUSTING PROCEDURE:

1. Open sensing line Isolating Valve (8) and pilot
Isolating Valves (2) and (13).
2.
PRESSURIZE THE VALVE SLOWLY
the bonnet of the Main Valve by using the valve on
top of the position indicator. Open main line
isolating valves to let the valve fill the reservoir.
Observe the altitude gauge and note the level where
the valve closes.
3. To increase reservoir level, turn adjusting nut
clockwise. To decrease
adjusting nut counterclockwise.
4. To adjust Differential Relief Pilot (6), turn the
adjusting screw clockwise for increased differential.
This differential pressure setting determines how
much below the reservoir level the supply head
must drop before the Main Valve opens.
5. Adjust Closing Speed Control (5) to prevent closing
surges.

SERVICE SUGGESTIONS:

In addition to service suggestions listed under individual
components, the following points should be considered:
PROBLEM:
VALVE FAILS TO CLOSE ON HIGH WATER
LEVEL.
Possible Cause / Remedy
1. Altitude Pilot (12) set too high. / Lower setting.
See 'Adjusting Procedure' above and 301-4
instructions.
2. Pilot Isolating Valve (2) or (13) closed. / Open
Valve
3. Closing Speed Control (5) closed tight. / Open 1/2
turn or as required.
4. Pilot sensing (9) not connected. / Check
connection and make sure that sensing line Isolating
Valve (8) is open.
PROBLEM:
VALVE FAILS TO OPEN.
1. Altitude Pilot (12) set too low. / Increase set-point.
See 'Adjusting Procedure' above and
301-4 instructions.
2. Differential Relief Pilot (6) set too high. / Reduce
setting.
PROBLEM:
VALVE OPENS TOO EARLY (NO
DIFFERENTIAL CONTROL).
1. Differential Relief Pilot (6) set too low.
Differential Relief Pilot (6) or Check Valve (4) leaks.
2.
and vent air from
Reservoir level, turn