SL-6
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, a seat pop-pet, a compression spring, a control spool as well as of a pre-opening as ball seat valve, which is optional.
Product Description
The seat valve can be flown through from A to B without ex-ternal pilot pressure. Condition: pA > pB + cracking pressure (compression spring). In the opposite direction, the seat valve closes hydraulical-lytight. A sufficiently high pilot pressure at port X moves the con-trol spool in the direction of the seat valve and pushes the seat poppet 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 pres-sure conditions on both sides of the control spool are just as important as the area ratio at the seat poppet or This results in the following available options for the types
–SV (large spool face A2 connected with pA) or
–SL (small front face A4 connected with pA)
as well as for the versions with pre-opening “A” and without pre-opening “B”.
Version “A” (with pre-opening)This valve is provided with an additional pre-opening. By pressurization at the X port, the control spool is moved to the right. As a result, the ball is pushed off the seat first and the seat poppet afterwards.
