After Huade was established, it cooperated with Rexroth twice. Huade® check valve SV are affordable substitutes for Rexroth's same series of products. It is competitive with well-know products with good quality and lower price. The factory has passed ISO9001, ISO14001, and OH SAS18001. It is a well-know national brand in China. Within the guarantee period, it is free to repair. All check valves undergo rigorous testing before leaving the factory to ensure superior and stable performance. Huade® hydraulic valves are widely used in the military industry and other fields due to the superior performance.
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Technical data |
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Style |
10 |
16 |
20 |
25 |
30 |
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Weight |
subplate mounting (kg) |
1.8 |
- |
4.7 |
- |
7.8 |
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threaded connection (kg) |
2.1 |
5.4 |
5.4 |
10 |
10 |
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Installation position (MPa) |
Optional |
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Direction of flow (MPa) |
From A to B free, from B to A through opening |
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Operating pressure, max.(MPa) |
0.5~315 |
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Control pressure, max (MPa) |
0.5~315 |
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Control volume -port X (cm3) |
2.5 |
10.8 |
10.8 |
19.27 |
19.27 |
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Control areas -area A1 (cm3) |
1.3 |
3.46 |
3.46 |
5.72 |
5.72 |
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-area A2 (cm3) |
0.33 |
0.7 |
0.7 |
1.33 |
1.33 |
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-area A3 (cm3) |
3.8 |
10.17 |
10.17 |
16.61 |
16.61 |
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-area A4 (cm3) |
0.79 |
1.13 |
1.54 |
1.54 |
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Pressure fluid |
Mineral oils(for NBR seal) or phosphate ester(for FPM seal) |
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Pressure fluid temperature range（℃） |
-30～+80 |
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Viscosity range (mm2/s) |
2.8 to 500 |
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Features:
▶ check valve controlled by fluid
▶ For subplate mounting,Mounting pattern to DIN 24 340
▶ Subplate or screw threaded connection
▶ With or without leakage port
▶ With or without pre-opening
▶ Type with pre-opening,dampened decompression
▶ 4 opening pressures
▶ Porting pattem to Din 24 340 fom A, 1SO 4401 and CETOP- RP 121H
Application:
Pilot operated check valves SV are used for the isolation of operating circuits under pressure, as safeguard against the lowering of a load when a line break occurs or against creeping movements of hydraulically locked-in actuators.
Check valves SV are hydraulic pilot operated check valves in poppet type design which may be opened to allow low in either direction.
Basically these valves consist of housing (1), poppet (2),compression spring (3), control spool (4) as well as a pre-opening,as ball poppet valve(5), optionally.
The valve enables free flow from A to B, in the counter direction the poppet (2) is held on its seat by the system pressure, additionally to the spring force.
Through the pressure connection at control port X the control piston (4) is moved to the right. This pushes the poppet(2) from the seat. Now the valve may also have a flow from B to A.
In order to ensure the proper opening of the valve via the control piston (4) a certain minimum control pressure is necessary.
This valve has a additional pre-opening. Through pressure connection at control port X the control piston (4) is pushed to the right.
This first pushes the ball (5) and then the poppet (2) from the seat. Now the valve may also have a flow from B to A. Because of the pre-opening there is a dampened decompression of the fluid under pressure. Through this possible pressure shocks are avoided
Cutaway view of check valve type SV. .PA
(without leakage port, with pre-opening)
Address
No. 27, Yangsha Road, Huilong Town, Nantong City, Jiangsu Province, China
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