Shijiazhuang Laiye Import& Export Trading Co., Ltd. is one of the leading manufacturers and suppliers of sd8 series — durable high-flow monoblock valve in China, also supports customized service. If you're going to wholesale high quality sd8 series — durable high-flow monoblock valve made in China, welcome to get pricelist from our factory.
More Flow Changes the Machine
When you go from 45 L/min to 80 L/min, the machine feels different. The boom lifts faster. The bucket cycles quicker. The operator gets more done in a shift.
That is what the SD8 delivers. It is the same monoblock design as the SD5-one piece of iron, no sections to assemble, no seals to leak-but it moves 80 L/min instead of 45. Almost double the flow.
If you are building or upgrading larger equipment, the SD8 gives you the extra flow without introducing the complexity of sectional valves.
The SD8 Series - Durable High-Flow Monoblock Valve is designed for machines that need to move more oil.
The Advantage
The SD8 gives you 80 L/min in a monoblock package. That is the key. You get the flow you need without the complexity.
Monoblock construction. No seals between sections. No tie rods. No assembly. One piece, ready to bolt on.
80 L/min. Enough for larger cylinders and faster cycles. If you have been running 45 L/min and hitting the limit, this is the step up you need.
31.5 MPa pressure. More power for demanding applications.
Phosphated surface. Corrosion protection that lasts. Passes 48-hour salt spray.
1 to 12 sections. Order what you need. No assembly required.
Durable construction. Iron castings, precision machining, ground spools. Built to last.
The SD8 Series - Durable High-Flow Monoblock Valve is for machines that outgrew the SD5 but do not need the complexity of sectional valves.
Specifications
| Parameter | Value |
|---|---|
| Control method | Manual |
| Pressure medium | Mineral oil based hydraulic oil |
| Nominal flow | 80 L/min |
| Viscosity range | 12 - 400 CST |
| Operating pressure | 31.5 MPa |
| Internal leakage | 15 cc/min at 160 bar, 50°C |
| Ambient temperature | -40°C to +80°C |
| Valve structure | Monoblock valve |
| Valve surface | Phosphating treatment |
| Valve sections | 1 - 12 sections |
Where the SD8 Belongs
Upgraded equipment. Machines that started with smaller valves and need more flow. The SD8 gives you headroom. You are not running the valve at 100% capacity. Less stress. Less heat.
Larger loaders. Moving more material means moving more oil. The SD8 keeps the bucket moving.
Harvesters and agricultural machines. Big machines need big flow. The SD8 delivers. No lag. No waiting for the hydraulics to catch up.
Industrial presses. Faster cycles with higher flow. More parts per hour. Better throughput.
Material handlers. Lifting and lowering, faster and smoother. The operator feels the difference.
If your machine needs more flow than the SD5 can provide, the SD8 is the natural step up. Same monoblock simplicity. Just more flow.
Installation
Mounting. Bolt the monoblock valve directly to the manifold. One unit, no assembly. No tie rods to torque. No sections to align.
Ports. P for pressure, T for tank, A1/B1, A2/B2, A3/B3 for actuators. The markings are on the body. You cannot miss them.
Control. Manual lever on each section. Move the lever, the spool shifts. No wires. No solenoids. Just direct mechanical control.
Surface treatment. Phosphated. The coating is already applied. No additional painting or treatment needed. Just bolt it on and go.
How We Build These Valves
Casting
Iron castings arrive at our foundry. Each one is inspected for porosity and dimensional accuracy. Castings with defects are rejected before they reach the machining line. One casting makes one valve-no separate sections to machine later. The material is high-strength alloy iron, chosen for its durability and wear resistance in demanding hydraulic applications.
Machining
The monoblock body is machined as one piece. All bores, ports, and mounting faces are machined in a single setup. This keeps everything perfectly aligned. No misalignment between sections. No tolerance stack-up. The spool bores are straight and true from end to end. Port threads are cut to standard specifications. Mounting faces are machined flat to ensure leak-free sealing against the manifold.
Spool grinding
Spools are ground to final size. Surface finish and clearances are checked carefully. Internal leakage depends on getting this right. Too tight, the spool sticks. Too loose, leakage goes up. We hold the spec. Each spool is matched to its bore for optimal performance.
Assembly
Spools are inserted into the bores. End caps are fitted. Levers are attached. No tie rods to torque. No sections to stack. No alignment pins to line up. Assembly is quick and straightforward. Every fastener is torqued to specification.
Testing
Every valve goes on the test stand. Leakage is measured at rated pressure. Spool shift is checked for smooth operation. Pressure is tested to ensure the valve holds rated pressure without external leakage. If it does not pass, it does not ship.
Phosphating
The assembled valve body receives a phosphate coating. This surface treatment bonds with the metal and provides corrosion resistance. Samples from each batch are salt spray tested to 48 hours. The coating is not paint-it will not chip or scratch off.
Packing
Small orders go into cartons with foam inserts. Bulk orders go into plywood cases. Test reports are included when requested.
Shipping
Sea, air, rail, truck, or express. Worldwide delivery. Tracking numbers provided for every shipment.
FAQ
Q: Why would I choose the SD8 over the SD5?
A: Flow. SD5 gives you 45 L/min. SD8 gives you 80 L/min. If your machine runs larger cylinders, faster cycles, or heavier loads, you need the extra flow. The SD8 gives it to you without adding the complexity of sectional valves.
Q: What is a monoblock valve and why does it matter?
A: One piece of cast iron with all sections built in. No seals between sections. No assembly required. Fewer leak points. Simpler installation. Lower cost than sectional valves. That is why it matters.
Q: How does monoblock construction reduce leak points?
A: Sectional valves have seals between each section. The SD8 has no sections, so it has no seals between sections. Fewer seals means fewer places for oil to leak.
Q: What machines typically use the SD8?
A: Larger loaders, excavators, agricultural machinery, industrial presses, material handlers. Any machine that needs more than 45 L/min but still wants the simplicity of a monoblock valve.
Q: How do I know if the valve needs repair?
A: Increased leakage, slow or erratic operation, or external leakage are signs. If performance drops, the valve should be inspected. Contact us for evaluation.
Q: Can the valve be repaired in the field?
A: Minor repairs-seal replacement and port cleaning-can be done in the field. Major repairs require clean room conditions. Ship it back to us for major work.
Q: Can I get the valve with my own brand on it?
A: Yes. OEM branding is available. We put your logo on the valve body. Minimum order for custom branding is 10 pieces.
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