Shijiazhuang Laiye Import& Export Trading Co., Ltd. is one of the leading manufacturers and suppliers of sd25 flow control valves in China, also supports customized service. If you're going to wholesale high quality sd25 flow control valves made in China, welcome to get pricelist from our factory.
Products Description
The SD25 flow control valve is a high-flow, sectional directional control valve featuring a rated flow of 240 L/min, a maximum working pressure of 315 bar, and a configuration of 1 to 12 sections. Its sectional design consists of individually cast modules bolted together to form the valve assembly. This offers flexible configuration: users can install only the required number of sections initially and expand the system later by simply adding more sections, eliminating the need to replace the entire assembly. Maintenance is streamlined, as individual sections can be removed or serviced without disrupting the operation of the others. Control options include manual, hydraulic, and electro-hydraulic actuation; the valve operates within a temperature range of -40°C to 80°C and is compatible with hydraulic fluids having a viscosity of 15–75 mm²/s.The SD25 flow control valve is widely used in heavy-duty equipment-such as telehandlers, all-terrain cranes, excavators, loaders, dump trucks, drilling rigs, and concrete pump trucks-and is particularly well-suited for heavy-duty hydraulic systems requiring the simultaneous operation of multiple high-flow actuators.
why choose us
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why choose our products
Onederful® Hydraulic is a professional manufacturer of hydraulic valves integrating R&D, production, and sales; since its establishment in 1988, the company has remained dedicated to the field of hydraulic control. Its product portfolio includes directional valves, pressure valves, flow control valves, and both monoblock and sectional multi-way directional valves. The company also offers custom, non-standard solutions to meet the diverse needs of clients across various industries.
The company maintains a comprehensive production chain, with all manufacturing processes carried out in-house. Key production stages utilize CNC equipment to ensure machining precision and product consistency. Every unit undergoes rigorous testing-including pressure resistance, internal leakage, and flow performance checks-before leaving the factory to ensure it meets all design specifications.
Onederful® products are exported to over twenty countries and regions, including Russia, Europe, the Middle East, and Southeast Asia, with an annual export volume exceeding 10,000 containers. Flexible logistics options are available, including sea freight, air freight, and international express delivery.
The company holds ISO certification and provides professional services throughout the entire process-from model selection consultation, solution design, and sample testing to after-sales support-earning the long-term trust of customers through reliable products and solid service.
Instructions for Use
Unpacking and Inspection
Upon receipt, unpack the product and inspect the valve body exterior to ensure there is no shipping damage, dust plugs on all ports are intact, and all accompanying documentation is present. Please contact the sales department promptly if any issues arise.
Installation Guidelines
Thoroughly clean the piping before installation to prevent impurities such as metal filings or welding slag from entering the valve body. The flatness of the mounting surface must be maintained within 0.1 mm. When assembling sectional valves, ensure that the seals between sections are seated flat and are not twisted. Tighten mounting bolts in a diagonal pattern, applying torque in stages according to specifications.
Piping Connections
Connect the piping according to the markings on the valve body: connect Port P to the pump outlet, Port T to the tank return line, and Ports A/B to the actuators. Ensure proper alignment during threaded connections to avoid damaging the threads. The back pressure at Port T must not exceed the specified limit.
Initial Startup
Before initial use, operate the system at low pressure without load for several minutes to fill the valve body with oil and purge air from the system; check for any abnormal noise or leakage. Once proper operation is confirmed, gradually increase the pressure to the working level and test the functions of each valve section.
FAQ
Q: Can I purchase just the valve sections for the SD25 and assemble it myself?
A: Yes, you can buy the valve sections and accessories separately for self-assembly. However, there are a few points to keep in mind during assembly: ensure the bolt torque is correct, seat the seals flat, and keep the oil ports protected from dust. If you are not confident in doing this, it is recommended to purchase a fully assembled unit.
Q: Can the valve body of an SD25 be repaired if it has cracked?
A: Valve body cracks generally cannot be repaired; the unit must be replaced. Cracks are typically caused by overpressure, additional stress resulting from an uneven mounting surface, or casting defects. Avoiding overpressure and ensuring a flat mounting surface during routine use can reduce the risk of valve body cracking.
Q: Is it necessary to drain the oil from the entire system when replacing a valve section on the SD25?
A: No, it is not. To replace a single valve section, you only need to drain the oil from that specific section's valve chamber. Shut down the system, relieve the pressure, remove the valve section, replace it, and reinstall it. The rest of the system remains unaffected.
Q: How does the OEM customization process work?
A: You provide the technical specifications and installation dimensions; we then prepare drawings for your approval and create prototypes. Once testing is successfully completed, we proceed to mass production. Packaging and labeling can also be customized to meet your requirements.
Q: What are the control methods?
A: Options include manual, hydraulic, and electro-hydraulic control. Manual control is used for simple equipment, hydraulic control for cab-based operation, and electro-hydraulic control for remote or automated systems.
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