Hose burst insert type check valves With female threaded sleeve
This valve is composed by a sleeve with an inserted “Hose
Burst” steel made cartridge type VPN1 (refer to RE 18329-85).
Flow is always allowed to pass from A to B according to the
Δp curves included in the Performance diagrams. The reverse
flow “B” to “A”, or reaction flow, is unrestricted up to the pre-set
value, above which the pressure drop across the floating disc
will push the disc against the valve body, and will determine
immediate closing of the line in a checked, leak free mode. The
valve will remain closed (checked) from B to A until pressure
is removed from the B, or until the A port pressure equalizes
the B pressure. To help re-setting, or shorten the time for the
disc to go back to the open position, the inserted cartridge can
be supplied with the Extra Orifice “F” on request. The orifice
diameter has to be specified when ordering (refer to table “Z”).
Precision machining and hardening processes allow virtually
leak free performance in the checked condition.