When a significant flow of water occurs, such as from an
open sprinkler, the alarm valve’s clapper lifts and allows
water to enter the system. Simultaneously, water enters
an intermediate chamber, which allows the water to
activate an alarm either through a water motor alarm or
through a water pressure alarm. These alarms continue
to sound until the flow of water is stopped.
The Victaulic Series 751 alarm check valve is made
from high strength, low weight ductile iron, and offers
easy access to all internal parts. All internal parts are
replaceable without having to remove the valve from
the installed position. The rubber clapper seal is easily
replaced without removing the clapper from the valve.
The valve is painted inside and out to increase corrosion
resistance.
The cULus, FM approvedversion of the valve station
valve can be installed in vertical orientations, and it can
be used in both constant and variable pressure systems
when the optional retard chamber is included in the trim
piping. The VdS, CE, LPCB, GOSTtrim version can only
be installed vertically. All versions of the Series 751 are
available grooved x grooved only.
The Series 751 is available 1½ – 8″/40 – 200 mm.
Standard grooved dimensions conform to ANSI/
AWWA C606.
Available Sizes and Approved Pressures – cULus,
FM approvedversion:
The 1½ – 6″/40 – 165.1 mm valve is rated to 300 psi/
2065 kPa and is tested hydrostatically to 600 psi/
4135 kPa. The 8″/200 mm valve is rated to 225 psi/
1550 kPa and is tested hydrostatically to 450 psi/
3100 kPa.
Options
Available Sizes and Approved Pressures: VdS, CE,
LPCB, GOSTversion:
This configuration available in 3″, 4″, 6″, 165mm (not
VdS approved) and 8″ sizes. These sizes are rated to
232 psi/16 bar. Optional equipment includes pressure
switch, which allows the activation of an electric alarm
panel or remote alarm. The valve can be used in both
constant pressure and variable pressure installations
with the optional retard chamber. The body is tapped for
main drain and all available trim configurations. The trim
includes an alarm test valve, which allows testing of the
alarm system without reducing the system pressure. The
Series 751 Alarm Check Valve can be purchased with
separate trim kits, or it can be purchased pre-trimmed.