REXROTH Check Valve, Pilot Operated Type SV And SL Size 6 Component Series 6X Maximum Operating Pressure 315 Bar Maximum Flow 60 L/min

The isolator valve type SV/SL is a pilot operated check valve for subplate mounting. It is used for the leak-free blocking of one actuator port, also in case of longer standstill times. The valve basically consists of a housing (1), a seat poppet (2), a compression spring (3), a control spool (4) as well as of a pre-opening as ball seat valve (7), which is optional. The seat valve can be flown through from A to B without external pilot pressure. Condition: pA > pB + cracking pressure (compression spring). In the opposite direction, the seat valve closes hydraulically tight. A sufficiently high pilot pressure at port X moves the control spool (4) in the direction of the seat valve and pushes the seat poppet (2) out of its seat. This allows for a free flow in both directions (active keeping open). In order to ensure that the seat valve actively opens, the pressure conditions on both sides of the control spool (4) are just as important as the area ratio at the seat poppet (2) or (7). This results in the following available options for the types – SV (large spool face A2 (6) connected with pA) or – SL (small front face A4 (8) connected with pA) as well as for the versions with pre-opening "A" and without pre-opening "B". Features – For subplate mounting – Porting pattern according to ISO 4401-03-02-0-05 and ISO 5781-03-04-0-00 – For the leak-free blocking of one actuator port – With internal or external pilot oil return, optional – Various cracking pressures, optional – With or without pre-opening, optional – Check valve installation separately available – Corrosion-resistant design, optional Pilot oil return internal = V Pilot oil return external = L With pre-opening = A Without pre-opening = B