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APPLICATIONS: For installation
in commercial fire lines, or any water supply
system to detect leakage or unauthorized
use. Designed for horizontal installation.
CONFORMANCE TO STANDARDS:
UL Listed; FM Approved.
DESCRIPTION: HERSEY
Model EDC III Detector Check Valves consist
of a main check valve with a rubber seal,
operated by a weighted lever (available
with optional trim kit and bypass meter).
The Model EDC III prevents water from re-entering
the potable water system, while detecting
leaks in the fire sprinkler system or unauthorized
use of sprinkler system water.
The optional bypass is comprised of a shutoff
valve, swing check, and a Hersey Model MVR
magnetic turbine meter, or a Hersey Model
400/500 IIS positive displacement meter.
Solid state remote reading systems are available
for all meters offered with the Model EDC
III (See Reading Systems Section).
OPERATION: With the
mainline valve held closed by the weighted
lever, any low flow will be directed through
the bypass and measured by the bypass meter.
When the pressure loss through the bypass
is approximately 1.5 psi, the mainline valve
opens automatically, allowing unrestricted
flow. The mainline valve and check on the
bypass prevent loss of water from the system.
Closing the inlet shutoff valve permits
in-line servicing of the bypass meter while
the mainline remains in service.
CONNECTIONS: Flange
x Flange
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Model Designation
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EDC III |
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Sizes |
4", 6", 8",
10" |
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Maximum Working Pressure |
175 PSI |
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Hydrostatic Test Pressure |
350 PSI |
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Temperature Range |
33F to 100F |
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Standards |
Underwriters Laboratories
(UL) Listed; Factory Mutual (FM) approved |
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Valve Body |
Standard - Fusion bonded
epoxy on cast iron; Option - Red Paint |
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Clapper Seat |
Rubber to Bronze |
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Optional Bypass Meter
Case |
Bronze |
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Optional Bypass Register |
Sealed Platic |
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Optional Bypass Interior |
Plastic |
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