VELOCITY CHECK VALVE

VELOCITY CHECK VALVE

VELOCITY CHECK VALVES REF 3000 SERIES
The REF 3000 Series velocity check valve is used to automatically block the flow of the line on which it is installed in
the case of an increase in speed due to the opening of the circuit downstream because of the maneuver, the
collapse of a plug fuse, the breakdown of a seal of any other motive which causes the downstream fluid to escape.
The commonest installation is on service lines equipped with plug fuses.
At the outbreak of a fire or as a result of a strong increase in the temperature in the installation protected, one or
more plug fuses collapse and let the fluid escape causing the REF 3000 to come into action
OPERATIONAL PRINCIPLE
Under normal working conditions the ball-shatter is kept away from its seat by a spring and allows the fluid for
replacing small losses, expansion, etc..to pass.
When, for any reason, between the valve upstream and downstream, there is a difference of pressure, the speed of
the fluid around the ball increases because the narrowing.
The ball is dragged into it’s seating and interrupts the passage of the fluid.
The reactivation ( or putting into operation ) is obtained by manual resetting which by-passes the flow and cancels
the pressure differential and permits the spring to move the ball away from it’s seating.
The by-pass closure is automatic.
The reduced section of passage around the ball gives the valve a high sensitivity, closing it at a very slight drop in
pressure.
CHARACTERISTICS
Connections : 1/2” NPT female
Maximum line pressure : 100 bar
Differential break pressure : 0.035 bar, minimum
Reset : manual, with spring reset