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Shijiazhuang Laiye Import& Export Trading Co., Ltd. is one of the leading manufacturers and suppliers of sd11 hydraulic sectional directional valve in China, also supports customized service. If you're going to wholesale high quality sd11 hydraulic sectional directional valve made in China, welcome to get pricelist from our factory.

SD11 Hydraulic Sectional Directional Valve Overview

The SD11 hydraulic sectional directional valve is a manually operated multi-way valve that controls the direction and speed of hydraulic cylinders and motors on mobile and industrial machinery. It offers a nominal flow of 75 L/min and an operating pressure of 350 bar (35 MPa). Because it is assembled from individual sections, you can match the number of controlled functions to your machine, and each section is operated by its own hand lever.

Key Technical Parameters

Parameter	Value
Nominal flow	75 L/min
Operating pressure	350 bar (35 MPa)
Structure	Sectional
Number of sections	1 to 4
Control method	Manual
Pressure medium	Mineral oil-based hydraulic oil

How the SD11 Works

A sectional directional valve is built from a stack of working sections held between an inlet section and an end cover. Each working section contains one spool, and each spool controls one hydraulic function, such as a cylinder or a motor.

Oil from the pump enters at the inlet port. A relief valve in the inlet section limits the maximum system pressure. If the pressure rises above the setting, the excess oil returns to tank, which protects the pump, hoses and actuators.

With the lever in neutral, the spool isolates work ports A and B from the pump flow, so the actuator holds its position. The pump oil passes through the neutral passage and returns to tank, or continues to another valve through the outlet port.

When you move the lever, the spool slides and opens a path from the pump to one work port while connecting the other work port to tank. The cylinder extends, or the motor turns one way. Move the lever the other way and the connections reverse. The further the lever travels, the more the spool opens the passage, so the operator can control speed smoothly instead of only switching on and off.

When the lever is released, a return spring brings the spool back to neutral and the movement stops.

Key features

Sectional design: one section per function, so the valve is matched to the machine instead of the machine to the valve.

75 L/min nominal flow: suited to the pumps found on small and medium mobile machinery.

Manual lever control: direct, progressive feel for the operator and no electrical supply required.

350 bar operating pressure: high enough for compact cylinders to deliver large forces.

Corrosion protection: phosphated surface tested for 48 hours in a neutral salt spray test.

Wide temperature range: ambient temperature from −40 °C to +80 °C.

Easy service: the SD series is designed for simple installation, maintenance and repair.

Where the SD11 Is Used

The SD11 fits machines where an operator controls several hydraulic movements by hand and the pump delivers up to about 75 L/min.

1.Refuse and sanitation vehicles:Several movements at moderate flow from an engine-driven pump.

2.Compact and tractor loaders:Fast cycles at up to 75 L/min with simple manual control.

3.Backhoe-type construction machinery:Many functions on one valve block, often used together.

4.Small drilling rigs:Smooth speed control with the levers.

5.Tipping trailers and truck bodies:Simple circuits that need no electrical control.

How to Choose the SD11

1.How many sections do you need?

Count the independent hydraulic movements on your machine. Each one needs its own section. Add a spare section if you plan to fit an attachment later, and tell us if any function needs a special spool, such as a float position, because that changes what you order.

A loader with a boom and a bucket needs 2 sections, or 3 with an attachment circuit. The SD11 can be built with 1 to 4 sections. Avoid ordering more sections than you need, because every extra section adds length, weight and cost.

2.Is 75 L/min right for your system?

Work out the flow each actuator needs. For a cylinder: flow (L/min) = piston area (cm²) × speed (m/min) ÷ 10. For a hydraulic motor: flow (L/min) = displacement (cm³/rev) × speed (rpm) ÷ 1,000.

Add up the flows of the functions that run at the same time, because they share the pump flow.

Compare the total with your pump output: flow (L/min) = pump displacement (cm³/rev) × speed (rpm) ÷ 1,000.

Choose a valve whose nominal flow is equal to or higher than the highest flow that will pass through it. Running above nominal flow increases pressure drop and heat and makes the spool harder to control.

Example: a 100 mm bore cylinder extending at 6 m/min needs 78.5 × 6 ÷ 10 ≈ 47 L/min. A second function using 25 L/min at the same time brings the total to about 72 L/min, close to the SD11 limit. If your simultaneous demand is higher, choose a higher-flow valve from the SD series.

3.OEM and customization

We can discuss OEM requirements such as your own brand marking and packaging, port threads, relief valve setting and spool function. Tell us what you need and our team will confirm what is possible and the minimum order quantity.

4.Lead time

Typically 7–10 days.

Frequently Asked Questions (FAQ)

1. What are the main specifications of the SD11?

The SD11 is a sectional valve with a nominal flow of 75 L/min, an operating pressure of 350 bar and manual lever control. It works in ambient temperatures from −40 °C to +80 °C.

2. How many sections can the SD11 have?

The SD11 can be built with 1 to 4 sections.

3. Can you supply OEM versions and technical drawings?

We can send the dimensional drawing, hydraulic schematic and datasheet, and we can discuss OEM requirements.

4. Can I get a datasheet or a quotation?

Yes. Send us the number of sections, your required port threads, operating conditions and quantity, and our sales team will confirm whether the SD11 hydraulic sectional directional valve fits your system and send drawings and a quotation.