Shijiazhuang Laiye Import& Export Trading Co., Ltd. is one of the leading manufacturers and suppliers of dr series — pilot-operated reducing valve in China, also supports customized service. If you're going to wholesale high quality dr series — pilot-operated reducing valve made in China, welcome to get pricelist from our factory.
One Pressure for the Main, Another for the Branch
Most hydraulic systems run at one pressure. The pump sets it. The relief valve limits it. Everything sees that pressure.
But not everything needs full pressure. Some circuits need less.
A clamp needs high pressure to hold. The feed cylinder after it needs less. A pilot control needs steady low pressure. A lubrication circuit needs just a few MPa.
The DR Series - Pilot-Operated Reducing Valve takes the main system pressure and drops it down for a branch circuit. The main stays at high pressure. The branch runs lower, controlled, stable.
The DR is pilot-operated. A small pilot valve senses the downstream pressure. It controls the main spool. The main spool opens and closes to keep the reduced pressure steady. When the branch circuit flow changes, the valve adjusts. The pressure stays where you set it.
Three sizes cover the flow range. Size 10 handles 150 L/min. Size 20 handles 300 L/min. Size 30 handles 400 L/min. Pick the size that matches your branch flow.
The pressure adjustment range is 5 to 30 MPa. The same for all sizes. Set it to whatever pressure your branch needs. Turn the screw on top. Clockwise for higher. Counterclockwise for lower. Watch the gauge on the branch circuit.
The valve mounts on a standard subplate. ISO 4401 interface. Design number is 50.
If you have a circuit that needs less pressure than the main system, this is the valve.
Specifications
| Parameter | Size 10 | Size 20 | Size 30 |
|---|---|---|---|
| Size | 10 | 20 | 30 |
| Max. working pressure | 31.5 MPa | 31.5 MPa | 31.5 MPa |
| Max. flow | 150 L/min | 300 L/min | 400 L/min |
| Pressure adjustment range (MPa) | 5 - 30 | 5 - 30 | 5 - 30 |
| Design number | 50 | 50 | 50 |
| Brand | Onederful® Hydraulic | Onederful® Hydraulic | Onederful® Hydraulic |
| Custom | OEM / ODM | OEM / ODM |
OEM / ODM |
How to Choose
Pick the size by branch circuit flow. Size 10 handles 150 L/min. Size 20 handles 300 L/min. Size 30 handles 400 L/min. Leave some margin. If your branch flow runs at 250 L/min, size 20 works but you are near the limit. Size 30 gives you headroom.
The pressure range is the same for all sizes. Set it anywhere from 5 to 30 MPa. The screw is on top. Turn it to set the reduced pressure.
If you are not sure which size fits, send us your branch flow and required pressure. We will recommend one.
Installation
The DR mounts on a subplate. Standard ISO 4401 pattern. Use the right bolts. Tighten them in sequence. Follow the torque spec.
The adjusting screw is on top. Make sure there is clearance to reach it.
The valve is directional. The ports are marked on the body. Install it with the correct orientation.
We preset the valve at the factory. Fine-tune it after installation. Watch the gauge on the branch circuit. Turn the screw until it reads what you need. Lock it in place.
How to Order
Ordering a DR valve is straightforward. You need to specify four things: size, pressure range, design number, and quantity.
Choose from size 10, 20, or 30. Match the size to your branch circuit flow. Size 10 handles 150 L/min. Size 20 handles 300 L/min. Size 30 handles 400 L/min. The pressure range is 5 to 30 MPa across all sizes. Design number is 50 - the current production version.
Standard valves have no minimum order quantity. You can order one piece. Custom valves - non-standard pressure ranges or special seals - have a minimum of 10 pieces.
An ordering example: DR-20-30-50. DR is the series. 20 is the size. 30 is the pressure range. 50 is the design number.
Contact Cathy by email or WhatsApp. Tell her the four items above. She will confirm availability, price, and delivery time. For standard valves, we usually ship within 2-3 business days if in stock, or 10-14 business days if not. For custom valves, lead time depends on the complexity.
Each valve comes with the standard packing list and inspection certificate. The inspection certificate confirms the valve passed our ten-step test. If you need additional documents - material certificates, detailed test data, or dimensional inspection reports - request them when you order. We will include them with the shipment.
Payment terms: T/T for larger orders. Paypal, Western Union, or MoneyGram for smaller amounts. Payment terms are negotiable for regular customers.
We ship by sea, air, railway, truck, or express. You choose the method. We provide tracking information for all shipments.
FAQ
Q: What does a reducing valve do?
A: It takes the main system pressure and drops it down for a branch circuit. The branch runs at a lower, controlled pressure. The main system stays at full pressure.
Q: What is the difference between the DR and the DA?
A: The DA unloads the pump. It opens when pressure is high enough and sends flow to tank. The DR reduces pressure for a branch circuit. It stays open and controls the lower pressure. Different applications.
Q: Can the DR maintain a steady reduced pressure when branch flow changes?
A: Yes. The pilot valve senses downstream pressure. When flow changes, the valve adjusts to hold the set pressure. This is what a pilot-operated reducing valve does.
Q: How do I set the reduced pressure?
A: Turn the adjustment screw on top. Clockwise increases the setting. Counterclockwise decreases it. Use a pressure gauge on the branch circuit to verify the setting.
Q: What if the reduced pressure drifts after setting?
A: Check the locknut. It must be tightened after adjustment. Check the oil temperature. As oil warms up, viscosity drops. The pressure may shift slightly. Set it at operating temperature.
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