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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 or vertical
installation.
CONFORMANCE TO STANDARDS: UL, ULC
listed; FM approved.
DESCRIPTION: HERSEY Model EDC IV
Check Valves consist of a spring loaded
main check valve (available with optional
trim kit and bypass meter). The Model EDC
IV prevents water from re-entering the potable
water system, while detecting leaks in the
fire sprinkler system or unauthorized use
of sprinkler system water. All operating
parts of the spring and clapper mechanism
are at-tached to the cover for easy removal
and maintenance. For safety, full spring
tension is not achieved until the cover
is bolted to the body. Spring mechanism
provides for low headloss during fire conditions.
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 IV (See Reading Systems Section).
OPERATION: With the mainline valve
held closed by the spring, any low flow
will be directed through the bypass and
measured by the bypass meter. When the pressure
loss through the bypass is approximately
2.0 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.
END CONNECTIONS: Flange x Flange
in all sizes.
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Model Designation
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EDC IV |
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Sizes |
3", 4", 6",
8" 10" |
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Maximun Working Pressure |
175 PSIG |
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Hydrostatic Test Presure |
350 PSIG |
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Temperature Range |
33F to 110F |
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Standards |
Underwriters Laboratories
(UL) Listed;
Underwriters Laboratories of Canada
(ULC) Listed;
Factory Mutual (FM) approved. |
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Valve Body |
Red enamel on cast iron
or optional fusion bonded epoxy coating
on cast iron. |
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Clapper Seat |
Rubber clapper on a bronze
seat |
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Bypass Tapping |
4"-8" .....3/4"
Tap
10" .....1-1/2" Tap |
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