Shijiazhuang Laiye Import& Export Trading Co., Ltd. is one of the leading manufacturers and suppliers of pilot unloading valve in China, also supports customized service. If you're going to wholesale high quality pilot unloading valve made in China, welcome to get pricelist from our factory.
DAW10 Pilot Unloading Valve - 40-250 L/min, 31.5 MPa
A pump that runs against full pressure all the time is wasting energy. It heats the oil, wears the pump, and costs money. The DAW10 stops that.
When system pressure reaches the set point, the DAW10 redirects pump flow to tank at low pressure. The pump keeps running, but it doesn't work against full pressure. That's what "unloading" means - the pump is unloaded, not stopped.
Available in three sizes: NG10 (40 L/min), NG20 (100 L/min), and NG30 (250 L/min). All rated at 31.5 MPa. Pressure adjustment: 8, 16, or 31.5 MPa. Design number: 30.
Transaction information
- 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 |
10 |
20 |
30 |
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Max working pressure Mpa |
31.5 |
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Max.Flow (L/min) |
40 |
100 |
250 |
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Working voltage |
DC |
12/24 |
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AC |
110/220 |
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Pressure adjustment Mpa |
80 / 160 / 315 |
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Design Number |
30 |
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What is an unloading valve
Some people confuse unloading valves with relief valves. They're different.
A relief valve opens to tank when pressure gets too high. It limits pressure for safety. It doesn't save energy - it just prevents overpressure.
An unloading valve opens to tank when pressure reaches a preset level. It redirects pump flow to tank at low pressure. The pump keeps running but without the load. This saves energy, reduces heat, and extends pump life.
So: one limits pressure, the other saves energy. The DAW10 is in the second category.
Product description
Our mission is grounded in a fundamental belief: technology should serve humanity, and quality should always inspire trust. At Laiye, we are convinced that exceptional technology can simplify even the most demanding tasks, and superior quality fosters lasting and reliable partnerships.
Each day, our engineering team is focused on enhancing the reliability and efficiency of our products. From refining designs to optimizing processes, from selecting the finest raw materials to conducting rigorous factory tests, we meticulously monitor every step to ensure that every product we deliver is dependable and worthy of our customers' confidence.
We embrace change and innovation with a forward-thinking approach, constantly adopting cutting-edge technologies to fuel continuous improvement. We know that only by evolving can we make machinery smarter, easier to use, and more efficient in production-improving performance while also easing the burden on people and creating greater value.
This commitment defines Laiye's vision and guides our path forward: to empower your work with dependable technology and unwavering quality, infusing greater ease and confidence into everything you do.
How it works
The DAW10 is pilot-operated. Here's the simple version.
A pilot stage watches the system pressure at the inlet. When that pressure reaches the set point, the pilot spool shifts. This opens the main spool, connecting P to T. Pump flow goes to tank at low pressure - the pump is unloaded.
When system pressure drops below the set point, the valve closes again. Pressure builds back up. The cycle repeats.
The pilot-operated design gives you smooth, stable control, even at higher flow rates. The valve responds consistently, without chatter or hunting.
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 workshop
FAQ
Q: Can I use the DAW10 Pilot Unloading Valve with a fixed displacement pump?
A: Yes. That's actually where it works best. A fixed pump running continuously needs unloading more than a variable pump. The DAW10 unloads it when pressure reaches the set point, saving energy and reducing heat.
Q: Can I use the DAW10 with a variable displacement pump?
A: You can, but it may not be necessary. Variable pumps already reduce flow when pressure is high. The DAW10 could still be useful if you need precise unloading control, but it's more common with fixed pumps. Tell us your system type and we'll confirm.
Q: What is the difference between unloading pressure and system working pressure?
A: Unloading pressure is where the valve opens and sends flow to tank. System working pressure is the pressure used to do work - moving cylinders, running motors. Set the unloading pressure slightly above your working pressure range. That way the pump stays loaded when work is being done, and unloads when the system is idle.
Q: What if I need to unload at more than one pressure level?
A: The DAW10 is a single-setpoint valve - it unloads at one pressure only. If you need multiple pressure levels, you'd need additional valves or an electrical control setup. Most systems work fine with a single unloading pressure.
Q: What pressure setting should I choose - 8, 16, or 31.5 MPa?
A: Choose the setting that matches your system's maximum working pressure. If you run at 20 MPa, choose the 31.5 MPa version. If you run at 12 MPa, choose the 16 MPa version. Always choose the next highest standard setting above your working pressure.
Q: How do I know if the valve is unloading properly?
A: Watch the pressure gauge. When the valve opens, system pressure should drop to near zero (or close to it). If pressure stays high, the valve isn't unloading fully - check the pilot stage for contamination or the main spool for sticking.
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