980GD-16-19 (Globe) Pump Control Control Valve with Mechanical Check Feature
2 IOM-A-ACV-980-16-19_680-16-19 2115
EDP# 1917102
© 2021 Watts
Standard Components
X
X
X
X
Y/FC
Y/FC
4
2A
2B
5
7
7
1
6
3(L)
CLOSES VALVE
OPENS VALVE
FLOW
Installation
1. Prior to installation, flush line to remove debris.
2. Install valve so the flow arrow matches flow through the line, and gauges to monitor valve inlet and outlet pressures. Install isolation
valves upstream and downstream of the main valve.
3. Provide adequate clearance for valve servicing and maintenance. Refer to valve servicing dimensions on next page. Avoid installing
valves 6" and larger in the vertical position (main valve stem horizontal). Automatic Control Valves (ACVs) are designed for horizon-
tal in-line installation, with the cover facing up (main valve stem vertical). Slow operation or premature stem and guide wear may
occur if valve is not installed according to factory recommendations. Consult factory for detailed engineering review prior to order-
ing if valve is to be installed other than horizontally in-line.
4. If valve is equipped with a pilot control system, extra precautions should be made during installation to protect the piping circuit
from damage. Only remove the pilot control system from the valve if necessary. Tubing and fittings should be kept clean and
replaced exactly as removed. Consult appropriate hydraulic schematic to ensure proper re-assembly.
5. Connect solenoid wiring leads to desired switching device, using safe, standard electrical practices.
6. Wire the limit switch contacts to the proper relay connections, using safe, standard electrical practices. Adjust the limit switch collar
to the approximate make/break contact position.
7. After installation, vent entrapped air from valve cover and pilot system by following instructions on Technical Bulletin.
Start-up of an automatic control valve requires that proper procedures be followed. Time must be allowed for the valve to react to adjustments and the
system to stabilize. The objective is to bring the valve into service in a controlled manner to protect the system from damaging over-pressure.
Operation
The Pump Control Valve is designed to minimize the surges asso-
ciated with the starting and stopping of pumps. The valve slowly
opens and closes as required to control pumping related surges.
The pump starts and stops against a closed valve.
Pump start up:
When the pump is signaled to start, the 3-Way
Solenoid is energized and pressurizes the cover chambers of
each 3-Way Accelerator Pilot. Accelerator Pilot (2B) directs fluid
and pressure into the power chamber (below the diaphragm), and
Accelerator Pilot (2A) relieves fluid and pressure from the cover
chamber (above the diaphragm). The fluid and pressure relieved
from the cover chamber is vented to atmosphere or available floor
drain. The valve opens at an adjustable rate, gradually admit-
ting pumping pressure into the distribution system. Rate of valve
opening is controlled by the adjustable opening speed control,
which restricts the speed at which fluid and pressure evacuate the
cover chamber. The valve remains fully open during the pumping
cycle.
Pump shutdown:
When the pump is signaled to shut-off, the
3-Way Solenoid is de-energized, relieving pressure from the cover
chambers of each 3-Way Accelerator Pilot. Accelerator Pilot (2A)
directs fluid and pressure into the cover chamber (above the
diaphragm), and Accelerator Pilot (2B) relieves fluid and pressure
from the power chamber (below the diaphragm). The fluid and
pressure relieved from the power chamber is vented to atmo-
sphere or available floor drain. The valve closes at an adjustable
rate, gradually reducing pumping pressure. Rate of valve closure
is controlled by the adjustable closing speed control, which
restricts the speed at which fluid and pressure evacuate the
power chamber. When the valve reaches the closed position, the
limit switch is actuated, turning the pump off.
Emergency Closure:
The valve is equipped with a Mechanical
Check Feature, which acts independent of diaphragm position,
and provides immediate closure when flow ceases.
Manual Operation:
Engaging the Solenoid Manual operator simu-
lates power to the solenoid, manually opening the main valve.
Disengaging the Solenoid Manual operator returns the valve to the
closed position.
1 – Main Valve (900GD-16 – Dual Chamber with Lift-Check)
2A – Model 22-1 Accelerator Control
2B – Model 22 Accelerator Control
3 – Limit Switch
4 – 3-Way Solenoid
5 – Adjustable Opening Speed
6 – Adjustable Closing Speed
7 – Check Valve
Y – Y-Strainer
X – Isolation Cocks
