34SM-L20H-T/W Manual directional control valve
3 month ago
Product details
I. Product Overview
The34SM-L20H-T/Wis a3-position, 4-way manual directional control valve, designed as a配套 control component (or used independently in certain applications) for swashplate-type axial piston variable displacement pumps. It is primarily used to switch oil flow paths in hydraulic systems by manually operating a lever to reposition the valve spool. Suitable for construction machinery, machine tools, mining equipment, and other scenarios requiring manual hydraulic circuit control.
------
II. Key Specifications
1. Model Variants
• 34SM-L20H-T: Features a specific neutral position function (e.g., "T" may represent an O-type or H-type neutral function; confirm via product nameplate).
• 34SM-L20H-W: Features an alternative neutral position function (e.g., "W" may represent a Y-type or P-type function).
• Nominal Port Size: L20H indicates a nominal port diameter of20 mm, supporting a maximum flow rate of approximately200 L/min(dependent on system pressure).
2. Performance Parameters
• Rated Pressure: ≤31.5 MPa, suitable for medium- to high-pressure hydraulic systems.
• Working Fluid: Anti-wear hydraulic oil (viscosity range: 10–80 cSt); compatible with mineral oils, water-glycol, etc.
• Temperature Range: -20°C to +80°C, adaptable to extreme environments.
3. Construction & Materials
• Valve Body: High-strength cast iron or steel for pressure resistance and shock absorption.
• Valve Spool: Hardened alloy steel (HRC ≥ 55 after quenching) for wear resistance.
• Seals: Nitrile rubber (NBR) or fluororubber (FKM) for oil/corrosion resistance and longevity.
------
III. Functional Features
1. 3-Position, 4-Way Design
• Supports three operational positions (left, right, neutral) for oil flow switching via lever operation.
• Neutral function determines oil path state (e.g., O-type locks flow, H-type unloads pressure); select based on system requirements.
2. Manual Lever Control
• Lightweight, effortless operation without external power sources, ideal for environments without electricity or unstable power.
• Lever design reduces operating torque and fatigue.
3. High Reliability
• Hydraulically balanced spool structure for strong contamination resistance in harsh conditions.
• Excellent sealing performance with minimal internal leakage to ensure system efficiency.
4. Modular Design
• Easy maintenance and component replacement to minimize downtime.
• Compatible with installation dimensions of mainstream Yuci-series valves in China for equipment retrofitting.
------
IV. Applications
1. Construction Machinery: Hydraulic cylinder control in excavators and loaders for action switching (e.g., digging, lifting).
2. Industrial Equipment: Mold opening/closing and ejection mechanism control in hydraulic presses and injection molding machines.
3. Mining Equipment: Directional adjustment of hydraulic motors in drills and crushers.
4. Marine & Offshore Engineering: Hydraulic drive control for deck machinery and steering gear.
------
V. Installation & Operation Guidelines
1. Pre-Installation Checks
• Verify valve model and neutral function match system requirements to avoid misuse.
• Clean oil lines to prevent debris from entering the valve and causing wear or jamming.
2. Installation Steps
• Plate-Mounted: Ensure mounting surface flatness ≤0.05 mm; tighten bolts diagonally to specified torque.
• Pipe-Mounted: Use standard hydraulic fittings; wrap thread sealant tape or apply sealant for threaded connections.
• Port Identification: Correctly connect P (pressure), T (tank), A/B (working ports) to prevent short circuits.
3. Operation Protocols
• Move lever smoothly; avoid excessive force or impact to prevent spring overload or spool damage.
• For detent-type valves (e.g., 34SO), confirm steel ball engagement to prevent unintended shifting; unlock before operating lock-type valves (e.g., 34SY).
------
VI. Maintenance & Troubleshooting
1. Regular Inspections
• Replace seals if leakage occurs at the spool stem.
• Drain hydraulic oil from the valve during long-term equipment shutdown to prevent internal corrosion.
2. Common Faults & Solutions
• Stiff Operation: Check hydraulic oil viscosity, internal debris, or deformed return springs.
• Shift Failure: Inspect control mechanisms (springs, steel balls, hydraulic reset circuits) or spool wear.
• Excessive Internal Leakage: Disassemble to check spool-valve body clearance; replace if >0.03 mm.
------
VII. Selection Recommendations
1. Define System Requirements: Pressure, flow rate, fluid type, and required neutral function (e.g., O-type, H-type).
2. Refer to Product Nameplate: Confirm neutral function symbols and mounting dimensions via official specifications.
3. Consult Suppliers: For technical support or selection assistance, contact manufacturers likeShanghai ShuangxuorYuci Hydraulic.
Similar Video Recommendation
<
>
Bossgoovideo.com Contact Now
If you are interested in the product, contact Bossgoovideo.com for more information
- *To:
- Ningbo Hengnuo Hydraulic Drive Co.,Ltd
- *Message:
-
Submit
Disclaimer :
The information of Bossgoovideo.com limited shown above is provided by the user or collected on the network. Video 2B does not guarantee the authenticity,accuracy and legitimacy of Bossgoovideo.com limited information. Video 2B does not involve legal relationships and disputes between users arising from
transactions other than secured transactions on this website. Disputes shall be settled by you through negotiation.
If you are the person in charge or relevant employee of this enterprise, if you find that the enterprise information is incorrect or want to manage thiscompany, please contact us jacklee1558@gmail.com, after you claim the enterprise, you can obtain management permission, publish supplyand demand information, bring consulting orders, and remove page advertisements.
Suppliers
Ningbo Hengnuo Hydraulic Drive Co.,Ltd
Audited supplier
4 year
Main Product:
hydraulic motor,
gear box,
hydraulic pump,
hydraulic valve ,
hydraulic winch,
hydraulic system