SD25 Sectional Directional Valve for 240 L/min Systems
Laiye has released the SD25 Sectional Directional Valve, a 240 L/min valve for large equipment where more than one hydraulic function runs at the same time.
On a container forklift, the mast tilts while the load lifts. On an all-terrain crane, the boom extends while the winch works. The pump puts out a fixed flow. Every circuit that opens takes a share.
Where the heat comes from
At 240 L/min, there is plenty of oil - until two or three functions call for it at once. Then each circuit gets a smaller piece. If the valve passages are tight, oil has to force its way through. Pressure drop rises. That energy turns into heat.
Heat does not stay put. Oil thins out. Internal leakage goes up. Actuators respond slower. On a long shift, the machine may need a pause just to let the oil cool.
What the SD25 changes
The SD25 is rated at 240 L/min nominal flow and 315 bar maximum pressure. It comes in 1 to 10 sections, so the stack matches the number of circuits on the machine - no unused ports taking up space.
View SD25 Sectional Directional Valve Specifications
Key figures:
Sections: 1 to 10
Rated flow: 240 L/min (63.4 US gpm)
Max pressure: 315 bar (4600 psi)
Viscosity range: 12–400 mm²/s
Ambient temperature: -40°C to +80°C
Section spacing: 62 mm
Port threads: G1 1/4, 7-G1, 2-M12
Each section has its own spool, spring and load check valve. The load check keeps the actuator from creeping when the directional spool goes back to neutral. A relief valve is also in the circuit, set to protect against pressure spikes.
The solution: sectional architecture sized for the flow
One mounting note
The valve mounts on a subplate or manifold. Through-bolts should be tightened evenly, in a cross pattern. On a 10-section stack, uneven torque can distort the section bodies and cause spool binding. Easy to overlook. Worth checking.
About the manufacturer
Shijiazhuang Laiye Import & Export Trading Co., Ltd. is part of Hebei Onederful® Hydraulic Technology Co., Ltd., founded in 1988. OEM customization is available with drawings and specifications.
