3A Series 3/2 Way Pneumatic Control Valve | External Air Operated Directional Valve

Brand: SOLH by Richge Technology 

1. Product Overview & Core Interface Function

     The SOLH 3A series is a mainstream 3/2 way external air-operated directional control valve following Airtac standard specifications. Driven purely by air signal instead of electromagnetic coil, it specializes in telescopic movement and pressure holding control of single-acting cylinders. It realizes safe and stable pneumatic logic of air intake, position holding and exhaust, serving as the core safety control component for non-electric pneumatic systems, explosion-proof environments and fail-safe equipment.

  1.1 Standard 3-Port Interface Definition

     • P Port: Main air inlet port for compressed air supply

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

     • R Port: Exhaust port for pressure relief and quick reset

  1.2 Working Logic & Structural Features

     • Single Pneumatic Control (3A110/210/310/410): Air signal for reversing, automatic spring reset after signal cut-off, fail-safe reset design.

     • Double Pneumatic Control (3A120/220/320/420): Alternate dual air signal control, maintains current position after air cut-off with memory latching function.

     • Core Structure: High-precision spool type structure, external pneumatic drive, durable aluminum alloy body, standard lube-free operation (special lubrication available for extreme working conditions).

2. Standard Model Coding Rules & Common Models

  1. Coding Logic: 3A [Series Size] [Control Type] - [Port Size]

  2. Common Model Specification & Application Scenarios

3. Core Technical Parameters

4. Core Product Advantages

     • Pure Pneumatic Explosion-proof Design: No electrical components inside, fully adaptable to dusty, humid and flammable explosive environments. It ensures automatic reset and equipment safety when air source or power fails, with ultra-high operational reliability.

     • Dual Control Mode Adaptability: Single pneumatic control for safe reset and pressure holding; double pneumatic control for air cut-off position memory and long-time locking, covering all conventional single-acting cylinder control logic.

     • High-efficiency Sealing Performance: Precision spool structure with special surface treatment process, featuring low startup pressure, excellent air tightness, stable switching and long service life.

     • Flexible & Space-saving Installation: Supports multi-angle arbitrary installation. It can be used independently or integrated with manifold bases to form modular valve groups, effectively saving equipment installation space.

5. Typical Application Scenarios

     • Single-Acting Cylinder Control: Realizes telescopic actions such as jacking, clamping and flipping, with cylinder extending by air intake and retracting by spring reset.

     • Equipment Safety Interlock System: Automatically resets and releases pressure when air source fails or equipment shuts down, avoiding mechanical jamming and ensuring production safety.

     • Long-term Pressure Holding Working Stations: Double pneumatic control mode maintains fixed cylinder position without continuous air supply, suitable for long-time clamping and positioning processes.

One Sentence Summary

     The SOLH 3A series is a standard 3/2 way external pneumatic control valve with single/double air control modes, precision spool sealing and aluminum alloy body. It is the preferred core component for safe reversing and pressure holding control of single-acting pneumatic cylinders.