Shijiazhuang Laiye Import& Export Trading Co., Ltd. is one of the leading manufacturers and suppliers of sd5 compact monoblock valve for 45 l/min systems in China, also supports customized service. If you're going to wholesale high quality sd5 compact monoblock valve for 45 l/min systems made in China, welcome to get pricelist from our factory.
What Makes This Valve Different
The SD5 is a monoblock valve. One solid piece of iron - not sections bolted together. No through-bolts to torque, no seals between sections. A single casting with all internal passages machined directly into it.
45 L/min at 250 bar. Up to 12 sections in one body.
With a monoblock, you trade flexibility for simplicity. You can't add sections later - the number is fixed at the factory. But you also get fewer seals, fewer leak points, and a more compact package. For equipment that doesn't change over time - and a lot of compact equipment fits that description - monoblock makes more sense than paying for sectional flexibility you won't use.
The SD5 Compact Monoblock Valve for 45 L/min Systems is built for equipment where simplicity matters more than expandability.
Practical Details
45 L/min - The Flow for Compact Equipment
45 L/min is what forklifts, small loaders, and light industrial equipment need. Not big excavator flow. Not 100 L/min. Just enough to get the work done without oversizing the valve.
250 bar max pressure is standard in this class - enough for the equipment that uses 45 L/min.
One Solid Block, No Joints
Because the SD5 Compact Monoblock Valve for 45 L/min Systems is a single casting, there's nothing to assemble. No stack. No through-bolts. No alignment issues between sections. The spool bores are machined into one block, so they stay aligned for the life of the valve. Bolt it down, connect the hoses, and go.
Surface Treatment
Phosphating. Passes 48-hour salt spray. Not paint - won't peel.
Internal Leakage
15 cc/min at 160 bar, 50°C.
Operating Principle
Push a lever. A spool slides. Oil changes direction. A cylinder moves. Let go, springs center the spool. Oil stops.
No sensors. No circuit boards. No software. A lever, a spool, and an iron block with precision passages.
Up to 12 sections in one monoblock body. Each section controls one function - lift, tilt, steering, or auxiliary. They share the same P port; each has its own A and B ports. The number of sections is fixed at the factory - you can't add sections later, but you also don't have to assemble a stack.
Specifications
| Parameter | Value |
|---|---|
| Control method | Manual |
| Pressure medium | Mineral oil based hydraulic oil |
| Nominal flow | 45 L/min |
| Viscosity range | 12–400 CST |
| Operating pressure | 250 bar (25 MPa) |
| Internal leakage | 15 cc/min @160 bar, 50°C |
| Ambient temperature | -40°C to +80°C |
| Valve structure | Monoblock |
| Surface treatment | Phosphating |
| Valve sections | 1 to 12 |
| 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.
Company Introduction
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.
Production Process
Raw Material Inspection
Iron castings and steel arrive with mill certificates. We verify each batch through spectral analysis for material composition and inspect for internal defects. Any material that doesn't meet spec gets rejected at the door - we don't compromise on raw materials.
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Precision Machining
Each valve body goes to the CNC machining center. Because the SD5 is a monoblock valve, the entire body is machined from a single casting - all internal passages, spool bores, and mounting surfaces in one setup. Tolerances are held to microns.
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Heat Treatment
Once machined, the bodies go through heat treatment. This relieves internal stress from the cutting process, improves wear resistance, and locks in dimensional stability so the valve holds its geometry over years of use.
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Spool Lapping
Each spool is precision-ground, then measured against its matching bore. Based on the actual clearance, we lap it to final spec. This step determines internal leakage performance - it's what keeps leakage at 15 cc/min instead of 50.
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Surface Treatment
The valve bodies are phosphated. This isn't paint - it's a chemical conversion coating that bonds at the molecular level. If the valve gets knocked, the coating stays. No peeling. We salt-spray random samples to confirm they pass 48 hours.
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Assembly
Working sections, inlet, and outlet are part of the same casting - there's no stack to assemble. Seals are installed, and the valve is prepared for testing. Each assembler stamps their work for traceability.
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Pressure Testing
Every valve gets tested. Not every tenth one - every single one. We check neutral leakage, pressure drop across each section, lever effort, and external leaks under pressure. Test data is filed against the serial number.
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Final Inspection
One last check - appearance, marking, packaging. If it passes, it goes to inventory. If it doesn't, it goes back.
FAQ
Q: How do I know if the SD5 is the right size for my machine?
A: We need your pump displacement, cylinder sizes, and number of functions. Send those to Cathy and we can confirm the sizing. We've done this for hundreds of customers - usually we can give you an answer within a few hours.
Q: Does the SD5 support electro-hydraulic control?
A: Yes. Swap the control cover for an electro-hydraulic pilot cover. Solenoid valves control pilot oil that shifts the spool. Same valve body.
Q: Are you a trading company or manufacturer?
A: Manufacturer. Everything in-house - machining, assembly, testing. This gives us control over quality and delivery that trading companies can't match.
Q: What applications is the SD5 suitable for?
A: Compact equipment needing 45 L/min at 250 bar - forklifts, small loaders, agricultural implements, light industrial machinery. It's built for machines where the configuration doesn't change. We've seen it used on small forklifts for mast tilt and side-shift, and on compact tractors for implement control.
Q: What is the recommended filtration accuracy?
A: Not specified in the datasheet. From our experience, we recommend ≤10 μm filtration to protect spool and bore surfaces. Clean oil is the single most important factor for valve life - we've seen valves last 10+ years with good filtration, and fail in under 2 years with dirty oil.
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