Manufacturer
Bosch Rexroth
Part number
R900347495
Country
Germany
Type
Check valve
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The isolator valve type Z2S is a releasable check valve in sandwich plate design.
It is used for the leakage-free blocking of one or two actuator ports, also in case of longer standstill times.
In direction A① to A② or B① to B②, there is a free flow; in the opposite direction, the flow is blocked.
If, for example, there is a flow through the valve in direction A① to A②, the control spool (1) is moved in the direction of the B side, opens the ball seat valve (2) and then pushes the poppet (3) off its seat. Hydraulic fluid can now flow from B➁ to B➀.
In order to allow the ball seat valve (2) to be safely closed, the control spool (1) must be hydraulically unloaded (see circuit example).
Pre-opening
Type Z2S 6 A…SO40
Type Z2S 6 A…SO60
Type Z2S 6 -…SO55 (with pre-opening)
- Due to the pre-opening, there is a damped decompression of the pressurized liquid. Thus, possible switching shocks are avoided.
- The two-stage set-up with an increased control open ratio means even low pilot pressure can be unloaded securely.
1 | Control spool, area A2 |
2 | Poppet, area A1 |
3 | Stop |
1 | Control spool, area A2 |
2 | Poppet, area A1 |
3 | Stop |
4 | Control spool, area A4 |
5 | Pre-opening, area A3 |