Shijiazhuang Laiye Import& Export Trading Co., Ltd. is one of the leading manufacturers and suppliers of wmm6 manual hydraulic directional control valve in China, also supports customized service. If you're going to wholesale high quality wmm6 manual hydraulic directional control valve made in China, welcome to get pricelist from our factory.
Products Description
The Basic Information
The WMM6 manual hydraulic directional control valve is a direct-operated, manually actuated directional valve designed for subplate mounting, featuring an NG6 interface. It supports a maximum operating pressure of 315 bar (160 bar at port T) and a maximum flow rate of 60 L/min. Spool configurations include various functions such as 2-position/3-way, 2-position/4-way, and 3-position/4-way, with neutral position options including spring return or detent positioning. It is compatible with hydraulic fluids having a viscosity range of 2.8 to 500 mm²/s. The valve assembly comprises a housing, operating lever, control spool, return springs, and push rod; models equipped with a detent mechanism allow all switching positions to be locked in place, and an optional cartridge-style orifice can be installed in the P-port to dampen switching shocks.
Application Scenarios
Industrial Machinery
Machine tool hydraulic systems: Used for manually and reliably switching operations such as worktable reversal, tool feed, and clamping/unclamping.
Injection molding machines: Used for manual switching of auxiliary functions such as mold locking, ejection, and injection.
Presses: Used for manual directional control of actions such as slide movement (lifting/lowering) and ejection.
Construction Equipment
Mini-excavators: Manual directional control for auxiliary circuits or pilot control circuits.
Loaders: Directional switching for attachments (e.g., buckets, forks).
Forklifts: Backup control for auxiliary functions such as fork lifting/lowering and tilting.
Other Equipment
Test rig hydraulic systems: Used for manually simulating directional switching under various operating conditions.
Maintenance and commissioning: Used for on-site manual commissioning and emergency operation of hydraulic systems.
Hydraulic circuits requiring manual intervention: Such as auxiliary controls for agricultural machinery and mining equipment.
The product advantages
1. Intuitive operation, no electricity required
Purely mechanical manual control; the spool is shifted directly via the handle, eliminating the need for electricity or pilot oil sources. It is ideal for applications where power is unavailable or electrical equipment is prohibited (e.g., explosion-proof environments), offering great convenience for on-site commissioning and emergency operation.
2. Simple structure, high reliability
Features a direct-acting spool design composed of a valve body, handle, spool, and spring, resulting in fewer potential failure points. Unlike solenoid or electro-hydraulic valves, it is free from issues such as coil burnout, loose connectors, or insufficient pilot pressure, ensuring high reliability during long-term use.
3. Various spool configurations available
Offers a range of spool functions-such as 2-position/3-way, 2-position/4-way, and 3-position/4-way-to suit diverse circuit control requirements. Various neutral position functions (e.g., O, Y, E, and W types) meet specific operational needs such as pressure holding, unloading, and floating.
4. Flexible neutral position retention
Options include spring return (WMM6.../ type) or detent positioning (WMM6.../F type). Spring return is suitable for applications requiring automatic centering, while detent positioning is ideal for operations requiring a specific shifted position to be maintained for extended periods (e.g., continuous oil supply circuits).
5. Easy installation and excellent compatibility
Designed for subplate mounting with a mounting interface compliant with DIN 24340 (Type A) and ISO 4401 standards, allowing for direct interchangeability with valves of the same specification from mainstream brands. The compact NG6 size makes it suitable for space-constrained hydraulic systems.
6. High cost-effectiveness
With a purely mechanical structure and no electrical components, manufacturing costs are lower than those of solenoid or electro-hydraulic valves, resulting in an affordable purchase price. Low maintenance costs ensure excellent long-term economic value.
| Product Parametes | ||
| Specification | 6 / 10 / 16 / 25 / 32 | |
|
Max working pressure MPa |
P/A/B (Oil ports) | 31.5 |
| T (Oil ports) | 16 / 21 / 25 | |
| Max flow (L/min) | 60 / 100 / 300 / 450 | |
| Design number | 50 | |
| Model number | C D J E for choice | |
| Brand |
Onederful® Hydraulic or OEM/ODM |
|
Production line
Casting: The valve body is precision-cast from high-strength ductile iron; temperature and solidification pressure are strictly controlled to ensure a dense, defect-free microstructure.
Machining: Rough castings are processed on high-precision machining centers, with critical dimensions controlled to within ±0.005 mm to ensure a precise fit between the valve spool and the valve bore.
Heat Treatment: The valve spool undergoes carburizing and quenching, achieving a surface hardness of HRC 58–62 and increasing wear resistance by more than threefold.
Surface Treatment: The valve body undergoes phosphating and a 48-hour neutral salt spray test, ensuring reliable corrosion resistance.
Component Inspection: All machined parts undergo dimensional, cleanliness, and visual inspections; only qualified parts proceed to assembly.
Assembly: Assembly takes place in a clean environment; selective assembly is used to optimize clearances, and imported seals ensure reliable sealing performance.
Final Inspection: Every product undergoes 100% inspection, including tests for pressure resistance, internal leakage, switching response, and flow performance.
Packaging and Shipping: After passing inspection, ports are sealed and the product is standard-packaged; the unit is then shipped to global customers accompanied by an inspection report.
FAQ
Q: What advantages does the WMM6 have over solenoid valves?
A: It features purely mechanical manual control, requires no electricity, and has a simple structure with fewer potential points of failure. It is free from issues such as burnt-out coils, loose connectors, or insufficient pilot pressure.
Q: Do manual directional control valves require regular maintenance?
A: Not much is needed. Periodically check the ease of operating the handle and change the oil promptly if it becomes dirty. If the handle becomes stiff to operate, it indicates that the fluid is starting to get contaminated or the valve spool is showing signs of wear; changing the oil and inspecting the valve at this stage is far less costly than waiting until it seizes up completely.
Q: Can the handle be removed and its orientation changed?
A: Yes. The handle is typically detachable, allowing the angle or position to be adjusted according to operating preferences. During on-site installation, the handle's orientation can be rotated; however, before mounting it, verify whether pushing the handle upward corresponds to forward or backward movement-installing it the wrong way around will reverse the operating direction.
Q: What causes the control handle to be stiff or difficult to move?
A: The primary cause is valve spool sticking due to fluid contamination, followed by mechanical interference with the handle. Check the condition of the hydraulic fluid; changing the fluid and cleaning the valve spool often resolves the issue. Seal aging and swelling can also increase resistance; prolonged exposure to mineral oil causes seals to swell and harden, thereby increasing resistance to spool movement, which necessitates seal replacement.
Q: Can the WMM6 be repaired on-site?
A: Yes. The WMM6 features a simple design, allowing key components-such as the handle, seals, springs, and detent assembly-to be replaced on-site. By keeping a supply of seals and springs on hand, most malfunctions can be resolved directly at the site. Replacing the spool assembly is necessary if the spool is worn; however, if high precision is required, returning the unit to the factory is recommended. Before disassembly, clean the surrounding area to prevent contaminants from entering the valve body.
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