Shijiazhuang Laiye Import& Export Trading Co., Ltd. is one of the leading manufacturers and suppliers of sectional directional valve sd11 — 75 l/min in China, also supports customized service. If you're going to wholesale high quality sectional directional valve sd11 — 75 l/min made in China, welcome to get pricelist from our factory.
Introduction
The SD11 is a sectional valve - sections bolt together into a stack, each controlling one function.
75 L/min at 315 bar. Available with 1 to 7 sections.
Here's what we've noticed over the years: not everyone needs 80 L/min, and not everyone needs 12 sections. Some machines just need 75 L/min and a handful of functions - and that's exactly where the SD11 fits.
It's not trying to be the biggest or the most flexible. It's trying to be the right size for a specific range of equipment. And with G3/4 inlet ports and G1/2 work ports, it matches a common plumbing standard that saves you from hunting for adapters.
For applications where flexibility matters, the Sectional Directional Valve SD11 - 75 L/min delivers.
A Closer Look
75 L/min - A Practical Middle Ground
75 L/min sits between the SD5's 45 L/min and the SD8's 80 L/min. It's for equipment that needs more than 45 but doesn't need 80. The kind of machines where 75 L/min is the sweet spot - not too much, not too little.
315 bar max pressure gives you the same capability as the SD8. You're not giving up pressure by choosing this flow.
Sectional Design - Add as You Go
Each section has its own spool, springs, and detent. Need three functions? Use three sections. Need five? Add two more. The stack grows with your machine, not against it.
Port Sizes - What Sets This One Apart
The SD11 uses G3/4 on the inlet and return, G1/2 on the work ports. This is a common configuration on certain types of equipment. If your system is already plumbed with these fittings, the SD11 fits without adapters.
Surface Treatment
Phosphating. Passes 48-hour salt spray. Not paint - won't peel.
Internal Leakage
15 cc/min at 160 bar, 50°C. Same standard as the rest of the series.
Specifications
| Parameter | Value |
|---|---|
| Control method | Manual |
| Pressure medium | Mineral oil based hydraulic oil |
| Nominal flow | 75 L/min |
| Viscosity range | 12–400 CST |
| Operating pressure | 315 bar (35 MPa) |
| Internal leakage | 15 cc/min @160 bar, 50°C |
| Ambient temperature | -40°C to +80°C |
| Valve structure | Sectional |
| Surface treatment | Phosphating |
| Valve sections | 1 to 7 |
| Rustproof level | 48h neutral salt spray test |
Options
Control: manual / pneumatic pilot / electro-hydraulic pilot
Lever style: standard or custom
Customization
Valve marking, packaging, shipping marks, manual language - all customizable for OEM orders.
Where It's Typically Used
Based on its flow rating and port configuration, the SD11 typically ends up on:
Compact Loaders
Usually two to four sections - boom, bucket, steering, and maybe an auxiliary circuit. The 75 L/min flow matches the gear pumps you typically find on smaller loaders. Operators notice the difference when stacking material - the boom lifts without that hesitation they'd gotten used to.
Small Excavators
Arm, bucket, swing, travel, and attachments - four to six sections is common. On a machine like this, cycle time matters. The SD11 moves enough oil to keep the swing quick and the bucket responsive, even with multiple functions running simultaneously. The G3/4 ports are a common fit on this class of machine.
Agricultural Equipment
Small balers, hay tools, and compact tractor attachments. Farm work is seasonal - you run hard when the weather holds, and you don't stop for breakdowns. The SD11 handles long days without thermal drift or performance drop-off.
Light Industrial Machinery
Lift tables, small presses, material handling systems. These applications don't need complex controls. They need to start, stop, and keep running. The SD11 does exactly that.
Production Process
Raw Material Inspection
We verify each batch through spectral analysis - any material that doesn't meet spec gets rejected at the door.
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Precision Machining
Each section is machined individually on CNC centers, with tolerances held to microns for proper spool-to-bore fit.
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Heat Treatment
Machined bodies undergo heat treatment to relieve internal stress, improve wear resistance, and lock in dimensional stability.
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Spool Lapping
Each spool is precision-ground and lapped against its matching bore - this step keeps internal leakage at 15 cc/min instead of 50.
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Surface Treatment
Valve bodies are phosphated - a chemical conversion coating that bonds with the metal and won't peel when knocked.
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Assembly
Sections are stacked and pulled together with through-bolts, torqued to spec, and stamped for operator traceability.
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Pressure Testing
Every valve is individually tested for neutral leakage, pressure drop, lever effort, and external leaks - data is filed by serial number.
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Final Inspection
One last check - appearance, marking, packaging. If it passes, it ships. If it doesn't, it goes back.
FAQ
Q: Does the SD11 come with a built-in relief valve?
A: No. The SD11 is a directional valve - it controls flow direction. Pressure relief is handled by a separate relief valve in your hydraulic system.
Q: What is the recommended filtration accuracy?
A: Not specified in the datasheet. We recommend ≤10 μm filtration to protect spool and bore surfaces. Clean oil is the single most important factor for valve longevity.
Q: Can I use the SD11 with a pump that delivers more than 75 L/min?
A: Exceeding rated flow increases pressure drop and heat generation. Short spikes are OK, but continuous over-rating shortens seal life. Match the valve to your pump output.
Q: How do I check for internal leakage?
A: Watch the cylinder. If it drifts in neutral, internal leakage may have increased. We can test the valve at our facility to confirm the leakage level.
Q: Can the SD11 be used in explosive environments?
A: The manual version has no electrical components, so it's suitable for many hazardous environments. For pneumatic or electro-hydraulic versions, check component ratings.
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