Description

Send Inquiry

Shijiazhuang Laiye Import& Export Trading Co., Ltd. is one of the leading manufacturers and suppliers of sd25 hydraulic sectional directional valve in China, also supports customized service. If you're going to wholesale high quality sd25 hydraulic sectional directional valve made in China, welcome to get pricelist from our factory.

SD25 Hydraulic Sectional Directional Valve Product Overview

The SD25 hydraulic sectional directional valve is a high-flow, lever-operated multi-way valve that controls the direction and speed of large hydraulic cylinders and motors. It has a rated flow of 240 L/min and a maximum pressure of 315 bar, and it is built from sections, one for each function you need to control.

Key Technical Parameters

Parameter	Value
Rated flow	240 L/min (≈ 63.4 US gpm)
Maximum pressure	315 bar (≈ 4,600 psi)
Sections	1 to 10 sections
Control	Manual lever
Viscosity range	12–400 cSt (mm²/s)
Ambient temperature	−40 °C to +80 °C

How the SD25 Hydraulic Valve Works

The SD25 functions as a stack of individual working sections clamped between an inlet cover (P) and an outlet cover (T). Each section contains a precision-ground spool mapped to an independent hydraulic circuit:

Neutral Position: Hydraulic oil enters port P, where a primary pilot-operated relief valve limits peak system pressure. When levers are in neutral, the spool blocks work ports A and B, maintaining load position while oil returns freely to the reservoir via outlet port T.
Proportional Metering: Actuating the lever slides the internal spool, directing high-pressure fluid to work port A (or B) while venting port B (or A) back to the tank. The spool stroke responds proportionally to lever displacement, allowing operators to fine-tune actuator speed smoothly.
Automatic Reset: Integrated heavy-duty return springs instantly return the spool to the neutral holding position upon lever release.

Where the SD25 valve Is Used

With 240 L/min, the SD25 hydraulic valve fits larger mobile machinery:

Wheel loaders and large tractor loaders: boom and bucket at fast cycle times.

Forestry cranes and timber trailers: boom, slew and grapple.

Truck-mounted cranes and tippers: boom, outriggers and body lift.

Large refuse and sanitation vehicles: lift, compaction and tipping.

At 240 L/min, a 125 mm bore cylinder (122.7 cm²) extends at about 19.6 m/min, and at 315 bar it can theoretically push about 387 kN.

How to Choose the SD25 valves

Sections: count your independent movements, one section each, and add a spare if you plan to fit an attachment. Tell us if any function needs a special spool, such as a float position.

Flow: cylinder flow (L/min) = piston area (cm²) × speed (m/min) ÷ 10. Add the flows of functions used together. Example: a 125 mm cylinder at 10 m/min needs about 123 L/min, and an 80 L/min function alongside brings the total to about 203 L/min, within the 240 L/min rating.

Pressure: pressure (bar) = 100 × force (kN) ÷ piston area (cm²). A 125 mm cylinder pushing 250 kN needs about 204 bar. Keep your relief setting below your lowest-rated component and below 315 bar, with a margin for shock loads.

Our B2B Manufacturing & Supply Guarantees

At Shijiazhuang Laiye Import & Export Trading Co., Ltd., we provide complete engineering support for global OEMs and distributors:

24/7 Engineering Support:** Rapid technical consultation and circuit advice.
15-Day Fast Lead Time:** Efficient manufacturing turnaround for standard and custom orders (MOQ: 100 pcs).
Custom OEM Services:** Laser nameplate etching, custom port threads (G / SAE / NPT), special spool positioning, and export packaging.
1-Year Warranty Coverage:** Comprehensive product testing with technical schematic verification.

Frequently Asked Questions (FAQ)

1. How many sections can the SD25 have?

The SD25 can be built with 1 to 10 sections.

2. What is the difference between the SD25 and the SD11?

Both are sectional valves with manual control. The SD25 is rated for 240 L/min and the SD11 for 75 L/min, so choose by the flow your pump delivers.

3. Can I order OEM versions?

Yes, we can discuss OEM requirements.

4. Can I get a datasheet or a quotation?

Yes. Send us your requirements and our sales team will confirm whether the SD25 hydraulic sectional directional valve fits your system and send drawings and a quotation.