Shijiazhuang Laiye Import& Export Trading Co., Ltd. is one of the leading manufacturers and suppliers of sd25 monoblock valve — 240 l/min manual control for high-flow systems in China, also supports customized service. If you're going to wholesale high quality sd25 monoblock valve — 240 l/min manual control for high-flow systems made in China, welcome to get pricelist from our factory.
Why Monoblock?
The SD25 is a monoblock valve - one solid casting, not sections bolted together. Up to 10 sections, all in one piece.
240 L/min at 315 bar.
Here's the thing about high flow: you don't realize how much you need it until you don't have it. When you're running a machine that needs to move a lot of oil quickly - large cylinders, high-speed attachments, multiple functions at once - a smaller valve becomes the bottleneck. The SD25 removes that bottleneck.
Monoblock isn't the right choice for everyone. If your machine might change over time, a sectional valve makes more sense. But if your configuration is fixed, monoblock simplifies the system. Fewer seals, fewer leak points, a more compact package, and a lower cost than a sectional valve with the same number of sections.
What you order is what you get. No future add-ons. Just a solid block of iron that does its job.
The SD25 Monoblock Valve - 240 L/min Manual Control for High-Flow Systems is built for equipment where simplicity matters.
A Closer Look
240 L/min - Serious Flow
240 L/min moves a lot of oil. This isn't for compact equipment - it's for big machines with big pumps and big cylinders. The kind of equipment where waiting for a cycle to complete costs money.
315 bar max pressure gives you the capability you'd expect at this flow level. You're not giving up pressure to get the flow.
Monoblock Construction
One solid casting. No stack assembly. No section-to-section alignment issues. The spool bores are all machined into the same block, so they stay aligned for the life of the valve. No through-bolts to check. No section seals to leak.
Port Sizes - Big Ports for Big Flow
The SD25 uses G1 1/4 on the inlet and G1 on the work ports. These are large ports because they need to be - 240 L/min won't fit through small fittings. If your system already uses these sizes, the SD25 fits without adapters.
Surface Treatment
Phosphating. Passes 48-hour salt spray. Not paint - won't peel when bumped.
Where It's Typically Used
Based on its flow rating and monoblock construction, the SD25 Monoblock Valve - 240 L/min Manual Control for High-Flow Systems is suited for equipment requiring high flow in a fixed configuration.
Large wheel loaders
Heavy construction equipment
Marine winches and cranes
Extreme-duty industrial systems
Mining support equipment
Specifications
All technical data sourced from the SD25 product datasheet.
| Parameter | Value |
|---|---|
| Control method | Manual |
| Structure type | Monoblock |
| Rated flow | 240 L/min (63.4 US gpm) |
| Max pressure | 315 bar (4600 psi) |
| Operating viscosity | 12–400 CST |
| Ambient temperature | -40°C to +80°C |
| Valve sections | Up to 10 sections |
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.
The Company
Shijiazhuang Laiye Import & Export Trading Co., Ltd., part of Hebei Wendefu Hydraulic Technology Co., Ltd., has been manufacturing hydraulic components since 1988 - over 35 years of experience. We are a factory, not a trading company, with around 200 employees and a full in-house production process covering machining, assembly, testing, and phosphating. Every valve is individually tested, not spot-checked, with test data filed against its serial number for full traceability. We export to more than 20 countries, hold ISO 9001 certification, and offer OEM customization, technical support, and a 12-month warranty. Material certificates, test reports, and certificates of origin are available upon request.
Manufacturing 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 monoblock body is machined from a single casting on CNC centers - all internal passages, spool bores, and mounting surfaces in one setup. Tolerances are held to microns.
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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
Seals are installed, levers attached. Each assembler stamps their work for 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: Can I get a valve with a different inlet port location?
A: Port configuration is fixed as shown in the drawing. Contact us if you need a different layout - custom porting may be possible for OEM orders.
Q: Can the SD25 be used with a closed-center hydraulic system?
A: Different spool types (open center, closed center, tandem center) are available for different circuit requirements. Specify your system type when ordering.
Q: What is the stroke length of the lever?
A: Lever stroke is designed for full spool travel. Contact us for exact stroke dimensions if you need to design around lever clearance.
Q: Does the valve have detent positions?
A: Yes. Standard configuration includes detents at each spool position for positive lever feel. Some configurations may offer spring-return only - specify when ordering.
Q: How do I handle the valve if it's been in storage for a long time?
A: Check lever movement before installation. Inspect the phosphated surface for any rust. Apply a light coat of oil if the surface feels dry. Follow standard installation and first-start procedures.
Q: Is there a version with a different control type?
A: Yes. The SD25 is available with manual, pneumatic pilot, and electro-hydraulic pilot controls. The valve body is the same - only the cover changes.
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