Manufacturer
Bosch Rexroth
Part number
R900407394
Country
Germany
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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
Notice:
In valves without pre-opening, sudden unloading of pent-up pressure volume may occur. Resulting switching shocks may lead to premature wear on installed components, as well as noise formation.
Notice:
Deviating from ISO 4401, port T is in this data sheet called TA, port T1 is called TB.
- 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 | Ball, area A3 |
| 4 | Poppet, area A1 |
| 5 | Stop |
| 6 | Control spool, area A4 |
| ① | component side |
| ② | plate side |
