Description
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.
The complete valve here shown is supplied with the Gap “R” Factory adjusted at 0.7 mm, corresponding to: Approx. (32–37) l/min, for size G 1/2, and Approx. (53–58) l/min, for size G 3/4, depending from oil viscosity. For special settings consult us.
