3L Series 3/2 Way Hand Pull Valve | Manual Spring Return Pneumatic Valve

Brand: SOLH by Richge Technology

1. Product Overview & Core Structure

     The SOLH 3L series is an AirTAC standard 3/2 way manual push-pull directional control valve with normally closed (NC) design. It directly switches pneumatic circuits through axial handle push and pull action. As a purely manual pneumatic component without electric or pneumatic drive sources, it is specially applied to single-acting cylinder control, air circuit on-off, jog operation and equipment safety interlock systems, widely used in debugging, emergency stop and explosion-proof working scenarios.

  1.1 Standard 3-Port Interface Definition

     • P Port: Main compressed air inlet port

     • A Port: Working output port, connected to single-acting cylinders

     • R Port: Exhaust port, support muffler installation for noise reduction

     • Drive Mode: Axial straight manual push-pull operation

     • Structural Feature: Precision spool type structure, high-strength aluminum alloy body, built-in spring automatic reset mechanism

2. 3/2 Way Working Principle

     • Normal Reset State: Internal spring tightens the spool, P inlet closed, A working port communicates with R exhaust port for pressure relief.

     • Working Pull State: Manually pull the axial handle to reverse the valve core, P port communicates with A port for air supply, R exhaust port is closed to drive cylinder action.

     • Release Reset: Loosen the handle, the valve automatically resets by spring force, cuts off air intake and exhausts residual pressure.

     • Core Logic: Standard NC normally closed structure with manual reset function, effectively preventing misoperation and ensuring equipment safety.

3. Standard Model Coding Rules & Common Models

  1. Coding Logic: 3L [Size Code] 10 - [Port Size] [Thread Type]

  2. Mainstream Common Models

     • 3L110-06: G1/8 port, mini size hand pull valve for micro pneumatic systems

     • 3L210-08: G1/4 port, most universal model, perfectly matched with standard single-acting cylinders

     • 3L310-10: G3/8 port, large flow design for high-thrust cylinder equipment

     • 3L410-15: G1/2 large bore port, suitable for heavy-duty large flow pneumatic circuits

4. Universal Core Technical Parameters

5. Core Product Advantages

     • Pure Manual Explosion-Proof Safety Design: No electrical components and air control sources, zero spark risk. Suitable for emergency stop, equipment debugging and explosion-proof dust environments with ultra-high operational safety.

     • Labor-Saving Axial Push-Pull Operation: Straight linear handle action with clear feedback and crisp reversing, stable hand feel and not easy to jam.

     • Spring Automatic Reset & NC Safety: Default normally closed state, automatically resets and cuts off air supply after releasing the handle, effectively avoiding continuous action caused by misoperation.

     • Compact & Durable Structure: Integrated aluminum alloy body with low-friction spool design, reliable sealing, wear resistance and long service life.

     • Professional Single-Acting Cylinder Matching: 3/2 way dedicated air circuit logic, perfectly adapted to spring return single-acting cylinders such as clamping and ejection mechanisms.

     • High Compatibility & Interchangeability: Consistent installation size with 3A series pneumatic control valves, supporting direct replacement and switching of manual/pneumatic control modes.

6. Typical Application Scenarios

     • Manual control of single-acting cylinders for clamping, ejection and spring return motion systems

     • Pneumatic circuit on-off control, equipment jog debugging and maintenance safety switch

     • Manual pneumatic control for explosion-proof zones, non-power and dusty industrial environments

     • Pneumatic logic systems matched with 3A pneumatic valves for manual/pneumatic composite control

One Sentence Summary

     The SOLH 3L series is a classic 3/2 way NC normally closed manual push-pull valve with spring automatic reset. It is a compact, safe and durable standard manual control component specially designed for single-acting cylinder pneumatic systems.