Huade is a well-known brand in China. After it was established, it had two long-term cooperation experiences with Rexroth. It can completely replace the SL series offered by Rexroth. The price is more reasonable. Huade® check valves SL series are competitive with good quality and lower price. Huade puts great stress on the quality. The factory has passed ISO9001, ISO14001, and OH SAS18001. Huade's hydraulic valves are widely used in the military industry and other fields due to the superior performance. All Huade® check valves will be packed in standard cartons plus waterproof plastic packaging.
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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 (㎫) |
Optional |
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Direction of flow (㎫) |
From A to B free, from B to A through opening |
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Operating pressure, max.(㎫) |
0.5~315 |
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Control pressure, max (㎫) |
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 volume -port Y (cm3) |
2 |
9.6 |
9.6 |
17.5 |
17.5 |
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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
Check valves SL are hydraulic pilot operated check valves in poppet type design which may be opened to allow low in either direction.
These valves 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.
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
The function of this valve is principally the same as the valve SV. The difference is the additional leakage port Y. With this the annulus area of the control piston (4) is separated from port A.
The pressure present at port A only effects area A4, of the control piston (4).
Cutaway view of check valve type SL. .PB
(with leakage port, without pre-opening)
Address
No. 27, Yangsha Road, Huilong Town, Nantong City, Jiangsu Province, China
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