MODEL DC WEIGHTED LEVER DETECTOR VALVES

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, ULC listed; FM approved (2" and 3").

DESCRIPTION: HERSEY Model DC Detector Check Valves consist of a main check valve with a reinforced elastomeric seat, operated by a weighted lever (available with optional trim kit and bypass meter). The Model DC 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 DC (see electronics 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 4 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.

Model Designation
DC

Sizes
2", 3", 12"

Maximum Working Pressure
175 PSI

Hydrostatic Test Pressure
350 PSI

Temperature Range
33F to 100F

Standards
UL, ULC listed; FM approved (2" and 3")

Value Body
Bronze - 2"; Epoxy coated cast iron - 3" and 12"

Clapper Seat
Reinforced elastomer on a bronze seat

Optional Bypass Meter Case
Bronze

Optional Bypass Meter Interior
Plastic (400IIS)

Optional Bypass Meter Register
Sealed plastic.

Toomey Water Services 2007 created and maintained by jra design