Shijiazhuang Laiye Import& Export Trading Co., Ltd. is one of the leading manufacturers and suppliers of dbd6p series direct-operated relief valve in China, also supports customized service. If you're going to wholesale high quality dbd6p series direct-operated relief valve made in China, welcome to get pricelist from our factory.
Product Information
The DBD6P is a direct-operated relief valve. It does one job: limits system pressure.
Inside the valve, a spring holds a spool closed. Oil pressure pushes against the spool from the other side. When the pressure gets high enough to overcome the spring, the spool moves. Oil flows through the valve and back to the tank. Pressure stops climbing. When pressure drops, the spring pushes the spool back closed.
That is the whole cycle. It happens fast. Hundreds of times a minute if it needs to.
No pilot stage. No external control. Just spring force and oil pressure. This makes the DBD6P simple and reliable. Fewer parts means fewer things to break.
The valve comes in one size - size 6. Maximum flow is 50 L/min. Maximum pressure is 31.5 MPa.
Five pressure adjustment ranges are available: 2.5, 5, 10, 20, and 31.5 MPa. You pick the range that covers your system operating pressure.
The adjustment is on top. Turn the handwheel or screw. Clockwise increases the pressure setting. Counterclockwise decreases it. A locknut holds the setting once you are done.
Mounting is standard. The valve bolts onto a subplate with an ISO 4401 interface. No special tooling required.
The DBD6P series direct-operated relief valve is used in hydraulic power units, small presses, clamping circuits, lubrication systems, and anywhere a system needs pressure protection. It sits on the pump outlet, ready to open whenever pressure goes too high. Simple. Reliable. Does the job.
Pressure Range Depends on Your System
The DBD6P series direct-operated relief valve comes in five pressure ranges. The number is the maximum limit:
2.5 MPa – Low-pressure circuits, lubrication systems
5 MPa – Low-to-medium pressure
10 MPa – Medium pressure
20 MPa – Medium-to-high pressure
31.5 MPa – High-pressure systems
Specifications
| Parameter | Value |
|---|---|
| Size | 6 |
| Max. working pressure | 31.5 MPa |
| Max. flow | 50 L/min |
| Pressure adjustment ranges (MPa) | 2.5 / 5 / 10 / 20 / 31.5 |
| Brand | Onederful® Hydraulic |
| Custom | OEM / ODM |
Production Process
Casting
Raw iron castings arrive from our foundry supplier. We inspect each one for porosity and dimensional accuracy. Any casting with defects is rejected at this stage.
Machining
We bore the body passages, drill the mounting holes, and machine the sealing surfaces. The spool is ground to final size. The seat is honed to finish. Clearances are measured in microns.
Cleaning
Every part goes through our wash station. Chips and cutting fluid are removed. The parts are dried and inspected for cleanliness. Any debris left at this stage will cause sticking or wear later.
Assembly
The spool goes into the body. The spring is installed. The adjustment screw is fitted. Every fastener is torqued to spec. Seals are replaced with new ones.
Pressure Testing
Each valve is tested before it leaves the bench. We check the cracking pressure. We adjust it to the set point. We check for leakage. The test data goes into the batch record.
Painting
The valve body gets a coat of industrial paint. The mounting surfaces stay bare.
Packing
Small orders go into cartons with foam inserts. Bulk orders go into plywood cases. Test reports are included if requested.
Delivery
We ship by sea, air, railway, truck, or express. Tracking is provided for every shipment.
We do not skip steps. We do not spot-check. Every valve goes through the full routine.
FAQ
Q: Do I need to relieve pressure before adjusting?
A: No. You can adjust while the system is running. Turn the handwheel and watch the gauge change.
Q: Does turning clockwise increase or decrease pressure?
A: Clockwise increases pressure. Counterclockwise decreases pressure. Tighten for higher pressure. Loosen for lower pressure.
Q: ow much pressure change per turn of the handwheel?
A: Depends on the spring range. Different ranges have different sensitivity. Smaller ranges are more precise. Larger ranges are less sensitive. Check the valve specifications.
Q: What if the valve is noisy when it opens?
A: First check for air in the system. If noise persists, the flow may be too high or the piping may be vibrating. Make sure flow is within the rated range and check pipe mounting.
Q: What causes unstable pressure with the gauge needle fluctuating?
A: The most common cause is system pressure fluctuation or slight spool sticking. First check oil cleanliness. Then check pump output stability. If both are fine, contact technical support.
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