Singer Valve 106-2SC-PCO Installation, Operating And Maintenance Instructions

DESCRIPTION:

Model 106/206-2SC-PCO is a valve positioned by
intermittent operation of Solenoid Valves (5) and (6).
It is normally operated by a programmable process
controller. The process controller is not included with
the standard valve.

DESCRIPTION OF OPERATION

Main Valve (1) closes when the inlet pressure is
directed to the bonnet (above the diaphragm) and
opens when the bonnet is vented to the downstream.
Refer to 106/206 PG "Description of Operation".
Solenoid Valves (5) and (6) are normally closed.
When both solenoids are de-energized, Main Valve
(1) remains in position. Energizing Solenoid Valve (5)
closes the valve. Energizing Solenoid Valve (6) opens
the valve.
Solenoids Valves (5) and (6) are normally equipped
with 120 VAC coils. 12 or 24 Volt DC coils that can be
driven by DC logic (SSR DRIVE) outputs from a
process controller are available.

MANUAL-BY-PASS

The pilot system is equipped with By-pass Valves (7)
and (8) so that the Main Valve can be opened or
closed without electricity. To close the Main Valve
manually, By-pass Valve (7) should be opened while
By-pass Valve (8) is closed. Reversing this operation
will open the Main Valve.

INSTALLATION:

1. Refer to 106/206-PG "Installation".
2. Check Solenoid Valves (5) and (6) for correct
voltage and operation.
3. Wire Solenoid Valves (5) and (6) to the controller
as required.
4. Pressurize the valve slowly and bleed air from the
bonnet of the Main Valve. See 106/206-PG
Instructions.
SINGER MODEL 106/206-2SC-PCO
Dual Solenoid Control Valve
Schematic A-7637A
IOM A-7637A Page 1 of 1

ADJUSTING PROCEDURE:

This valve is normally operated by pulsing Solenoid
Valve (5) or (6) to position the Main Valve as
required. This means that the Main Valve moves in a
step fashion. Size of these steps is determined by the
length of the pulse (time of of energization) and the
setting of Speed Controls (4) and (9).
Adjust pulse width and Speed Control settings to get
required control.

SERVICE SUGGESTIONS:

1. See service suggestions for
Valve and Solenoid Valve.
2. Never energize the solenoid coil when the coil
is removed from the Solenoid Valve.
3. If the Main Valve fails to close, the inlet pressure
is not connected to the bonnet because:
- Isolating Valve (2A) or (2B) is closed.
- Strainer (3) is plugged.
- Closing Speed Control (4) is closed.
- Solenoid Valve (5) is de-energized or faulty.
- By-pass Valve (8) is open.
- Main Valve diaphragm is ruptured.
- An obstruction in the Main Valve seat is
preventing closure.
If the Main Valve does not open, pressure is not
being relieved from the bonnet because:
- Solenoid Valve (6) is not energized or is
faulty.
- Opening Speed Control (9) is closed.
- Isolating Valve (2B) or (2C) is closed.
- There is not sufficient pressure drop available
to open the Main Valve.
July 2005
th
12850-87 Avenue
Surrey, BC. Canada. V3W 3H9
Ph: 604-594-5404
Fx: 604-594-8845
www.singervalve.com
106/206-PG Main