ZENNER FHZD Fire Hydrant Backflow Meter with RPZ
ZENNER FHZD Fire Hydrant Backflow Meter with RPZ
ZENNER FHZD Fire Hydrant Backflow Meter with RPZ
INTRODUCTION: FHZD Fire Hydrant Backflow Meters
with built-in dual check valves and RPZ dump valve, are
designed to measure a wide variety of cold potable water
flows from fire hydrants where flows are in one direction.
These Meters are lightweight portable units designed for
temporary installations. The built-in dual check valves help
provide a practical solution to help prevent backflow into
the primary water source. The RPZ (Reduced Pressure
Zone) Dump Valve allows this assembly to dump to atmosphere
when the check valves are fouled.
OPERATION: Water flows through the turbine section,
causing the rotor to turn proportionately to the quantity of
water flowing through the meter. A drive magnet transmits
the motion of the rotor to a driven magnet located within
the hermetically sealed register. The magnet is connected
to a gear train which translates the rotations into volume
totalization displayed on the register dial face.
CONSTRUCTION: FHZD Fire Hydrant Meters consist of
several basic components: lightweight aluminum main
case, turbine type measuring element assembly, sealed
register, aluminum cover plate, stainless steel hardware,
brass lid assembly, aluminum or brass swivel and nipple,
stainless steel handles, front and rear 3” check valves, RPZ Dump Valve and adjustable support stand. The
measuring element assembly includes the rotor assembly, vertical shaft and a calibration vane which eliminates
the need for calibration change gears.
MAINTENANCE: FHZD Fire Hydrant Meters are engineered and manufactured to provide long-term service and
operate virtually maintenance-free. If maintenance is necessary, the measuring element can be removed from
the main case. The 3” Check Valves and RPZ can be easily serviced.
CONFORMANCE: FHZD Hydrant Meters are tested and comply with AWWA C701 Class II performance standards.
These Meters comply with the lead-free provisions of the Safe Drinking Water Act and are certified to
NSF/ANSI Standards 61 and 372.
STRAINERS: FHD Fire Hydrant Meters come with a built-in 54 square inch strainer after the first check valve
and in front of the Turbine Measuring Element.
CONNECTIONS: FHD Fire Hydrant Meters are typically configured with bronze fire hose connections, although
aluminum connections are available.
OPTIONS: Locking devices, special order connections, gate valves, meter stands, “add-on” restrictor plates, etc.
