DB/DBW
Green Hydraulic
DB/DBW
Yes
ISO9001,CE
1 set
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Product Description
DB / DBW pressure valves are pilot‑operated relief valves. DB performs system pressure limitation and safety overload protection. DBW integrates solenoid valve to realize electric remote unloading besides pressure‑limiting function. Adopting ISO 6264 standard sub‑plate mounting, they feature stable pressure control and low noise performance. Multiple pressure ranges and adjustment types are available. Widely used as main pressure control element for hydraulic power units and various industrial hydraulic systems
Pilot‑operated two‑stage structure delivers stable pressure regulation, low pressure hysteresis and low noise, ensuring consistent system performance under varying load conditions.
DB version provides reliable overload pressure‑limiting protection; DBW adds solenoid remote electric unloading, helping reduce power consumption and system heat for energy‑saving operation.
ISO standard sub‑plate mounting offers high interchangeability, convenient installation and direct replacement for mainstream brand valves.
Multiple adjustment types including rotary handwheel, hex screw with protective cap and lockable handle meet different on‑site operation requirements.
Wide optional pressure setting ranges cover diverse industrial hydraulic working conditions.
DBW solenoid can be equipped with manual override for emergency operation; multiple coil voltage options fit global power supply standards.
Compatible with standard mineral hydraulic oil. Optional FKM seals support special hydraulic media to expand application scope.
Available in NG10, NG20, NG30 sizes with maximum working pressure up to 31.5 MPa, covering flow demands of most hydraulic power units.
Specifications
Valve Type: Pilot‑operated two‑stage relief valve
(DB: pressure‑limiting relief valve;DBW: relief valve with solenoid remote unloading function)
Mounting: ISO 6264 standard sub‑plate mounting
Nominal Sizes: NG10, NG20, NG30 Max.
Operating Pressure (Port P/A): 31.5 MPa (315 bar)
Max. Pressure (Port T): 10 MPa (100 bar)
Pressure Setting Ranges: 50 bar, 100 bar, 200 bar, 315 bar
Max. Flow Rate: NG10‑100 L/min; NG20‑200 L/min; NG30‑400 L/min
Adjustment Options: rotary handwheel, hex screw with protective cap, lockable handle
Solenoid Voltage for DBW: DC24V, AC110V, AC220V; solenoid with manual override optional
Hydraulic Fluid: Standard mineral hydraulic oil (HL/HLP); FKM seals for special media optional
Viscosity Range: 10‑800 mm²/s
Fluid Temperature: ‑30 ~ +80 °C (NBR seals); ‑20 ~ +80 °C (FKM seals)
Filtration Requirement: ISO 4406 20/18/15 or better
Weight:‑ NG10: DB‑2.5 kg; DBW‑3.7 kg ‑ NG20: DB‑5.8 kg; DBW‑7.0 kg ‑ NG30: DB‑11.2 kg; DBW‑12.4 kg
Applications
DB/DBW pressure valves are widely used as main pressure control components for hydraulic power units. DB valve serves for system pressure setting and overload safety protection. DBW relief valve can realize electric remote unloading besides pressure‑limiting function, effectively reducing power consumption and heat generation.
They are suitable for machine tools, injection molding machines, metallurgical presses, die‑casting machines, hydraulic test benches and general industrial hydraulic equipment. DBW version is ideal for systems requiring periodic unloading operation.

Factory&FAQ
DB/DBW pressure valve are typically packaged securely to prevent damage during transit. The packaging includes:
Protective Wrapping: To safeguard the pump from environmental damage.
Custom Crates: For larger, heavier pumps, ensuring safe handling.
Documentation: Includes installation, maintenance instructions, and warranty details.
Delivery time depends on the model, customizations, and location but typically ranges from 2 to 6 weeks from the order date.
1. What is the DB/DBW pressure valve ?
DB/DBW pressure valves are pilot‑operated two‑stage relief valves. DB is used for system pressure limitation and overload safety protection. DBW integrates solenoid valve to achieve electric remote unloading on the basis of pressure‑limiting function. With ISO 6264 standard sub‑plate mounting, they are core pressure control parts for hydraulic power units and industrial hydraulic systems.
2. What makes the DB/DBW pressure valve ?
It adopts pilot‑operated two‑stage structure with low pressure hysteresis and low‑noise performance. DB provides reliable pressure‑limiting and overload protection; DBW adds solenoid for remote electric unloading to save energy. ISO 6264 standard sub‑plate mounting ensures good interchangeability. Various pressure ranges and adjustment types are available. DBW supports multiple coil voltages and optional manual override. Compatible with diverse hydraulic media, covering NG10, NG20, NG30 sizes for wide‑range industrial applications.
3. What is the working pressure range of DB/DBW pressure valve ?
The maximum working pressure of main oil ports P/A is up to 31.5 MPa (315 bar). The return‑oil port T maximum allowable pressure is 10 MPa (100 bar). Multiple pressure setting ranges are optional: 50 bar, 100 bar, 200 bar and 315 bar to satisfy different system requirements.
4. Can DB/DBW pressure valve replace other brands?
Yes, it can replace valves of mainstream brands. Its mounting dimensions comply with ISO 6264 standard. Please check key parameters including nominal size, pressure setting range and rated flow before replacement. For DBW model, solenoid voltage also needs confirmation. Customized options are available for special working conditions.
5. What is the Response / Switching frequency of DB/DBW pressure valve ?
DB type response depends on system pressure variation, generally 30‑70 ms. For DBW solenoid‑operated version, solenoid response time is around 40‑90 ms. It is designed for pressure limiting, overload protection and periodic unloading, not intended for high‑frequency switching cycles. Actual performance is influenced by oil viscosity, filtration quality and system flow rate.
6. Do you provide OEM or customized services?
Yes, OEM and customized services are offered. We support custom pressure ranges, adjustment forms, seal materials, solenoid voltages for DBW version, logo and packaging. Please provide technical specifications or drawings for accurate quotation.
7. How can I get a quotation quickly
Please provide the following details:
Model or displacement
Working pressure
Speed
Quantity
We will reply within 12 hours with a competitive quotation.
DB/DBW pressure valve are manufactured in compliance with international standards, ensuring high performance and reliability:
ISO 9001: Certified for quality management systems.
CE Certification: Ensures compliance with European safety, health, and environmental protection standards.
RoHS Compliance: Ensures the pump does not contain hazardous materials.
Factory Testing: Every pump is rigorously tested for performance, pressure, and leak integrity before shipping.
1.What's our advantages?
Factory established in 2005;
With a great deal of production experience;
80+ employees become the professional team;
Constant updated ERP system ensure efficiency of work;
Sophisticated equipment ehanced the accuracy of products;
Professional salesmen provide the greast service;
With a large number of famous customers all over the world;
Great after-sales service;
With the long term cooperation with famous logistics and express company in China,provide the better goods service.
Small order/sample order,full payment in advance; Big orders send the first payment 30% before the production,and the balance before shippment.We'll show the photos of the products and packages before delivery.
Of course we can. Just send me your logo we can make it for you.
America(40.5%):USA, Canada, Argentina, Brazil
Europe(30.8%):Italy,Germany,England,Holland,Spain,Swiss,Finland,Russia,Poland.
Asia(23.5%):Korea,singapore,India,Turkey,Vietnam,Saudi Arabia,Syria, Israel,Lebanon.
Others(5.8%).
The Green hydraulic pump manufacturing facility is a specialized industrial plant that focuses on producing hydraulic pumps and related components. These factories are equipped with advanced machinery and technology to fabricate high-quality pumps designed for a wide range of applications, from heavy equipment and machinery to automotive and industrial systems.
The production process typically involves precision engineering, where raw materials like metals and alloys are processed into pump components such as gears, pistons, cylinders, and seals. These parts are then assembled into fully functional hydraulic pumps, which are tested for performance and quality control to ensure reliability, efficiency, and durability under various working conditions.
