Shijiazhuang Laiye Import& Export Trading Co., Ltd. is one of the leading manufacturers and suppliers of solenoid pilot relief valve in China, also supports customized service. If you're going to wholesale high quality solenoid pilot relief valve made in China, welcome to get pricelist from our factory.
DBW Series Solenoid Pilot Relief Valve - NG10 to NG30, 35 MPa
A pump running against full pressure all the time is wasting energy. It heats the oil, wears the pump, and costs money.
The DBW series solenoid pilot relief valve does two jobs in one valve: it limits system pressure, and it lets you dump that pressure on command. Limit and unload - two functions, one component.
When system pressure reaches the set point, the relief stage opens. When you energize the solenoid, the valve opens fully and drops pressure to near zero. The pump keeps running, but it's not working against full pressure. Less heat, less wear, less energy.
Available in NG10 to NG30 sizes, flows from 250 to 650 L/min at 35 MPa. Pressure settings: 5, 10, 20, 31.5, or 35 MPa.
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PRODUCT PARAMETERS |
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Specification |
10 |
20 |
30 |
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Max working pressure Mpa |
35 |
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Max.Flow (L/min) |
250 |
500 |
650 |
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Working voltage |
DC |
12/24 |
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AC |
110/220 |
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Pressure adjustment Mpa |
5 / 10 / 20 /31.5 / 35 |
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Design Number |
50 |
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Product description
Which size fits your system?
| Size | Flow | Best for |
|---|---|---|
| NG10 | 250 L/min | Small-to-medium systems |
| NG20 | 500 L/min | Mid-range systems |
| NG30 | 650 L/min | Large systems |
All rated at 35 MPa. Voltage options: DC 12/24V or AC 110/220V. Pick whichever matches your control system.
How it works - the simple version
The valve keeps an eye on system pressure. Pass the set point, the pilot stage opens, the main spool lifts, and excess oil goes back to tank. Pressure drops, the valve shuts again.
With the DBW type: hit the solenoid, the valve opens all the way-pressure drops to near zero. The pump runs light until you kill the solenoid signal.
Pilot-operated means smoother control, steadier under load, even at higher flows. No chatter, no hunting-just consistent response.
Company profile
Shijiazhuang Laiye Import & Export Trading Co., Ltd. has been in the hydraulic business since 1988. We're part of Hebei Onederful Hydraulic Technology Co., Ltd., and we've grown by making use of the group's resources and technical know-how.
We've got a skilled team and years of experience behind us. Our products sell well at home and abroad-Russia, Europe, the Middle East, South America, Asia. We stay focused on what customers actually need, and we put quality and service first. That approach has earned us trust and good feedback from partners around the world.
Going forward, we'll keep improving our products and services, driven by technology and what the market asks for. We aim to build strong, long-term partnerships that create real value for everyone involved.
Operating range
Temperature: -30°C to +80°C. Cold starts, hot engine bays, it handles both.
Viscosity: 10 to 800 mm²/s. Covers most hydraulic fluids.
Fluids: Mineral oil or phosphate ester.
Filtration: NAS1638 Level 9.
Subplate mounting - standard porting pattern to DIN 24340 form E, ISO 6264, CETOP-RP 121H. If your manifold follows these, the valve bolts straight on. No adapter plates, no custom machining.
Production Process
Raw Material Inspection
High-strength cast iron and alloy steel are checked for composition and mechanical properties before anything else happens.
Precision Machining
CNC equipment handles milling, drilling, grinding, and honing to hold tight tolerances on bodies, spools, and end covers. After machining, all parts go through deburring, cleaning, and dimensional verification.
Heat Treatment
Key components such as spools and valve seats undergo hardening to improve wear resistance and extend service life.
Surface Treatment
Phosphating or other rust-proof coatings are applied to protect against corrosion and improve surface durability.
Assembly
Skilled workers install spools, springs, seals, and control parts in sequence, with torque control on each connection.
Pressure Testing
Every assembled valve goes through hydraulic testing-pressure resistance, leakage detection, and functional debugging under rated working pressure.
Final Inspection
Visual inspection, dimensional confirmation, and test data review. Each valve is individually tested, not spot-checked, with test data filed against its serial number for full traceability.
FAQs
Q: Manufacturer or trader?
A: Manufacturer. We run our own production.
Q: What is the difference between DB and DBW?
A: DB is a pilot-operated relief valve - pressure control only. DBW adds a solenoid directional valve on top - pressure control plus solenoid unloading. The DBW gives you the option to drop system pressure on command.
Q: Can I adjust the pressure while the system is running?
A: Yes. Turn the adjustment element slowly and watch the gauge - the set pressure changes immediately. Don't exceed the valve's maximum rating.
Q: What happens if the solenoid fails?
A: The relief function still works - the valve will still limit pressure. You just lose the ability to unload. The solenoid is replaceable; keep a spare coil on hand if unloading is critical to your process.
Q: Can the valve be used with fluids other than mineral oil?
A: Standard seals are NBR for mineral oil. For other fluids - water-glycol, phosphate ester, or high-temperature applications - we can fit alternative seals. Specify your fluid type when ordering.
Packaging and transportation
Factory workshop
Company exhibition
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