Shijiazhuang Laiye Import& Export Trading Co., Ltd. is one of the leading manufacturers and suppliers of direct relief valve in China, also supports customized service. If you're going to wholesale high quality direct relief valve made in China, welcome to get pricelist from our factory.
DBDH Direct Relief Valve - NG6 to NG30, 50-350 L/min
Some relief valves use pilot stages. The DBDH doesn't. Spring and spool. That's all.
Spring holds the spool shut. System pressure pushes against it. When pressure wins, the spool lifts. Oil goes to tank. Pressure drops, spring shoves it shut again.
Simplest relief valve you can get. No pilot delay, no complex guts - just fast, direct response. Comes in NG6 to NG30, 50 to 350 L/min at 31.5 MPa. Pressure settings: 2.5, 5, 10, 20, or 31.5 MPa.
Product introduction
Fast response, reliable protection
Direct-acting means fast. The valve reacts to pressure changes in milliseconds. Pressure spikes get caught before they become a problem. Equipment stays safe, even under varying loads.
Simple design, consistent performance
Just three main parts: body, spool, spring. No pilot stages, no complicated internal channels. Fewer parts means fewer things to fail. Easier to maintain, longer service life.
Compact, easy to fit
Small footprint, light weight. Fits into tight spaces where other valves won't. Multiple port sizes and mounting options - works in power units, pneumatic systems, mobile machinery.
Cost-effective, versatile
Good protection without the high cost. Works well in low-to-medium pressure systems with modest flow. Use it as a main safety valve, an auxiliary circuit limiter, or a pilot pressure control.
Owing to their quick response, robust construction, and user-friendly design, direct-acting relief valves have become vital pressure protection components across industrial machinery, construction equipment, and automated systems. Whether serving as the main safeguard for an entire system or managing localized circuit pressure, they offer a reliable and economical solution for overpressure control.
For detailed specifications or assistance with model selection, please do not hesitate to contact us.
Transaction
- Minimum order quantity: 10 pieces
- Payment method: T/T, Paypal, Western Union
- Supply Ability: Annual output of 1,000,000
- Delivery time: 10-15 days
- Conventional packing: Wooden case
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PRODUCT PARAMETERS |
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Specification |
6 |
10 |
20 |
30 |
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Max working pressure Mpa |
31.5 |
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Max.Flow (L/min) |
50 |
120 |
250 |
350 |
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Pressure adjustment Mpa |
2.5 / 5 / 10 / 20 / 31.5 |
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Product detail
Production process
Manufacturing focuses on stable, reliable overpressure protection. Standardized processes and strict QC ensure dependable long-term performance in hydraulic and pneumatic systems.
1. Precision Manufacturing
Valve core, seat, and body are CNC-machined for high accuracy and smooth surfaces. Springs are pressure-rated and tested for precise control. All auxiliary parts are produced and inspected to standard.
2. Cleaning and Surface Treatment
All metal parts undergo ultrasonic cleaning to remove contaminants. Anti-corrosion or protective surface treatments are applied as required to enhance durability.
3. Assembly and Calibration
Components are assembled in a clean environment. Opening pressure is accurately set and locked using a calibrated test bench, and sealing elements are installed to prevent leakage.
4. Testing and Inspection
Each valve is tested for opening pressure, sealing performance, and repeatability. Final inspections cover appearance, dimensions, and labeling, followed by protective packaging with documentation.
Through continuous process optimization, every direct-acting relief valve delivers fast response, reliable sealing, and long service life, ensuring effective pressure protection for fluid power systems.
Where it belongs
The DBDH Direct Relief Valve is for systems where fast response and simple construction matter more than ultra-precise pressure control.
Hydraulic power units - primary or auxiliary relief
Pilot circuits - pressure limitation
Safety circuits - overpressure protection
Low-to-medium pressure systems - general pressure control
If you don't need the complexity of a pilot-operated valve, the DBDH gets the job done with less cost and fewer things to go wrong.
About the company
Shijiazhuang Laiye Import & Export Trading Co., Ltd., part of Hebei Onederful® Hydraulic Technology Co., Ltd., has been making hydraulic components since 1988. Directional valves, pressure valves, flow valves - and accessories.
Products go to Russia, Europe, the Middle East, South America, and Asia. ISO 9001 certified. Each valve is tested individually, with data linked to its serial number.
Packaging and transportation
Factory
Company exhibition
FAQ
Q: What is a direct-operated relief valve?
A: A relief valve that uses a spring directly to hold the spool closed. No pilot stage - faster response, simpler construction.
Q: When should I choose a direct-operated valve over a pilot-operated valve?
A: When you need fast response, simple construction, and lower cost - and your system operates at low-to-medium pressure and flow. If you need ultra-precise pressure control at high flow, a pilot-operated valve is a better choice.
Q: What's the difference between "direct-operated" and "pilot-operated"?
A: Direct-operated uses a spring directly. Fast response, simpler, lower cost. Pilot-operated uses a two-stage design - a pilot valve controls the main spool. Flatter pressure-flow curve, better for high flow and precision.
Q: Can I adjust the pressure while the system is running?
A: Yes. Loosen the lock nut, turn the adjustment slowly, watch the gauge. Tighten the lock nut when you're done. Just don't exceed the valve's rating.
Q: What if the valve doesn't close properly?
A: Check for contamination. Dirt on the spool or seat can prevent the valve from sealing. Clean the valve and check your oil cleanliness. If the seat is damaged, the valve may need repair.
Q: What if the valve leaks externally?
A: Check the mounting bolts first - they may have loosened. Tighten to the specified torque. If the bolts are tight, the seal ring may be worn - replace it.
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