|
 The
Model 740-Q Pump Control Valve, Booster Type is an automatic
control valve designed to be installed on the discharge of a
booster pump to prevent pressure surges caused by the starting
and stopping of the pump.
It is a pilot controlled, hydraulically operated, diaphragm
actuated globe valve in either the oblique (Y) or angle pattern
design.
The Model 740-Q Pump Control Valve operates independently
of valve differential pressure. The double chambered diaphragm
actuator always has full differential pressure to develop maximum
power and immediate reaction. A 3-way solenoid pilot valve either
applies upstream pressure to the upper control chamber to close
the main valve or vents the upper control chamber to atmosphere
allowing the main valve to open.
The solenoid and a limit switch assembly on the main valve are
electrically synchronized with the pump controls to allow the
pump to start and stop while the valve is closed thus eliminating
any pressure surges. The pump starts against a closed valve
which begins to open slowly as the solenoid is energized with
the pump.
The 740-Q opens to allow maximum flow with minimal head loss.
When the pump is signaled to stop, the solenoid is de-energized
causing the main valve to close against the running pump. As
the valve is about to close the limit switch is activated which
causes the pump to stop.
 In
the event of a power failure the Model
740-Q Pump Control Valve will close immediately, regardless
of the operational mode of the valve at the time of the power
failure. A unique system of hydraulic check valves provides
this quick closure to prevent pump damage.
The solenoid pilot valve can be supplied in various voltages
and NEMA ratings.
Back to 700 Series Control
Valve Line Up
|
