SV6PB2-6X/V
Manufacturer: Bosch Rexroth
Material #: R900516497
Model : SV6PB2-6X/V
***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Bosch Rexroth directly.***
The Bosch Rexroth SV6PB2-6X/V (R900516497) is a sophisticated isolator valve designed for subplate mounting and is specifically crafted to provide leak-free blocking of an actuator port, ensuring reliability even during extended periods of inactivity. This releasable check valve operates by allowing flow from direction A to B without the need for external pilot pressure, as long as the condition pA > pB is met, which refers to the cracking pressure of the compression spring. On the reverse flow, it seals hydraulically tight.
The valve's functionality is enhanced by its internal components, which include a housing, a seat poppet, a compression spring, and a control spool. Additionally, there's an optional preopening feature that functions as a ball seat valve. The presence of sufficiently high pilot pressure at port X can shift the control spool and lift the seat poppet from its seat—this action permits free flow in both directions when actively keeping open.
Two distinct versions cater to different operational needs: Version A comes with preopening and ensures secure unloading even at low pilot pressures while minimizing switching shocks due to dampened decompression. In contrast, Version B lacks preopening and may result in sudden unloading of pressure volume—potentially causing premature wear on components and noise.
Moreover, users have the flexibility to modify this type SV valve into type SL by exchanging plugs; one plug must always be installed for proper function. The SV6PB2-6X/V is compatible with ISO 6263/ISO 6264 porting patterns and offers customizable options such as various cracking pressures and corrosion-resistant designs. Its maximum operating pressure stands at 315 bar with a maximum flow capacity of up to 60 l/min. Individual check valve installation sets are also available for this model.
$672.00 USD
More are expected on March 17, 2025
Status: This product is temporarily out of stock.
Qty: Delivered as early as March 17, 2025 when ordered in
This product is eligible for factory repair.
The isolator valve type SV is a releasable check valve for subplate mounting. It is used for the leakage-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 direction 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 ratios on both sides of the control spool (4) are just as important as the area ratios at the seat poppet (2) or (7).
This results in the following available options for the types
SV (large spool face A2 (6) connected to pA ) oras 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 port X, the control spool (4) is moved to the right. As a result, the ball (7) is pushed off the seat first and the seat poppet (2) afterwards.
Notes!
Version "A":
The two-stage set-up with an increased control open ratio means even low pilot pressure can be unloaded securely. Avoidance of switching shocks due to dampened decompression of the pressure volume on the actuator side.Version "B":
In case of valves without pre-opening, the included pressure volume may be unloaded suddenly. Resulting switching shocks may lead to premature wear on installed components, as well as noise formation.
The modification of type SV to type SL is possible by exchange of plugs (9) and (10). One of the both plugs must always be installed!
Type SV 6 PB.‑6X/…
|
5 |
Area A1 (seat poppet) |
|
6 |
Area A2 (control spool) |
|
7 |
Area A3 (ball) |
|
8 |
Area A4 (control spool) |
|
Type |
Plug (9) |
Plug (10) |
|
SV |
M3 (open) |
M6 x 1 (closed) |
(measured with HLP46, ϑOil = 40 ±5 °C)
Δp-qV characteristic curves
Calculation of the pilot pressure pSt dependent on pA and pB
|
pA* |
Type-dependent (for type SL: pA* = 0) |
|
pSt |
Pilot pressure |
|
pA |
Working pressure in A |
|
pB |
Working pressure in B |
|
pF |
Cracking pressure (spring) |
|
A1 – A4 |
For areas, see sectional drawing and control area ratios |
Version "A" (with pre-opening)
Balance of forces:
Assumption: pA = 0
Version "B" (without pre-opening)
Balance of forces:
Assumption: pA = 0
Pilot oil return, internal
Dimensions in mm
|
L in mm |
||
|
Version |
without pre-opening "B" |
with pre-opening "A" |
|
„1“ , „2“ , „3“ |
11 |
21,5 |
|
„4“ |
14 |
– |
|
1 |
Port Y (M6 x 1; closed for type SV) |
|
2 |
Name plate |
|
3 |
Identical seal rings for ports A, B, P(X), (T)Y |
|
4 |
Plug screw SW24 (pilot spool), tightening torque MA = 80+5 Nm |
|
5 |
Plug screw SW22 (check valve uses), tightening torque MA = 25+5 Nm |
|
6 |
Through hole for valve mounting screws |
|
7 |
Porting pattern according to ISO 4401-03-02-0-05 and ISO 5781-03-04-0-00(with locating hole and locking pin ISO 8752-3x8-St) |
|
8 |
Locking pin ISO 8752-3x8-St |
Valve mounting screws (separate order)
4 hexagon socket head cap screws ISO 4762 - M5 x 50 - 10.9
(with friction coefficient μtotal = 0.14);
tightening torque MA = [si]8.9 Nm[/si][/imp]6.6 lb-ft[/imp] ± 10%
(please adjust in case of modified surfaces; use manual torque wrench!)
