User Manual

41
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What is Water Hammer?
Water hammer is a phenomenon that can occur in uid
systems with long pipes. Water hammer is a rapid change
of pressure caused by a rapid change in velocity. If the ow
has been abruptly shut o downstream, the pressure in the
entire system is raised very quickly.
What Causes Water Hammer?
Any action that can cause a rapid change in the velocity
of the ow can set o a water hammer, such as closing a
downstream valve, pump stoppage, etc. Typically, for short
lengths of pipe (below 500 feet) downstream valves that
are closed within 1/10 of a second can generate
water hammer.
What Can Water Hammer Do?
Pressure spikes from water hammer can raise uid pressures
to dangerously high values. These pressure spikes can cause
serious damage to valves, pipes, strainers, joints, etc. The
CS strainer is rated to an absolute maximum pressure of 150
psi for bolted lid models, and 125 psi for clamped lid models.
A water hammer pressure spike that raises the pressure
higher than the maximum rated pressure may result in
strainer damage, voiding the manufacturer’s warranty.
What Can I Do to Prevent Water Hammer?
There are certain precautions that can be taken to prevent
or decrease the eect of water hammer. The addition of a
surge tank or accumulator tted with a suitable pressure
relief valve strategically located within the water system
may provide adequate protection against the eects from
water hammer. Careful attention should be given to the
design and control strategy for valves and pumps so their
actions do not invite a water hammer.
Stainless Steel Strainer Options
Automatic Timer Flush (AFT) Package Option
The ATF-EA-1.5 ush valve package provides an automatic
method for ushing away the debris collected in the
strainer’s reservoir. The power supply and timer controls for
the valve package are housed inside the ATF control box.
The ATF controls can be pre-programmed to set the ushing
duration and the time interval between ushes.
System Components
1. Timer based valve controller: (see Figure 18) sets the
ush duration (length of the ush) and the ush interval
(time between ushes).
2. Electric Ball Valve: designed for dirty water use (see
Figures 18 and 19).
Figure 18
A
GREEN POINTER
INNER RING
(LENGTH OF FLUSH)
(FACTORY SET AT
8-SECONDS)
RED POINTER
OUTER RING
(TIME BETWEEN
FLUSHES)
(FACTORY SET AT
24-HOURS)
Figure 19
B
12VDC@2.5A POWER
FROM PDA OR 120V PLUG
IN TRANSFORMER
OPEN/CLOSE
INDICATOR
COVER-PLATE SCREWS
(4) IN CORNERS OF BOX
(TIMER BASED VALVE
CONTROLLER)
CONTROL SWITCH
Figure 20
Valve Specications (See Figure 20)
A. Water-resistant polypropylene motor case
B. High torque motors with perma-lube gears
C. Open and close indicator
D. Stainless steel ball valve and hardware
E. Auto reset circuit breaker
F. 90° bi-directional rotation
G. Controller case