4A Series 5/2 & 5/3 Way Pneumatic Control Valve | Pure Air Operated Directional Valve

Brand: SOLH by Richge Technology 

1. Product Overview & Core Structure

     The SOLH 4A series is an AirTAC standard 5/2 way & 5/3 way external pneumatic directional control valve, regarded as the pure pneumatic version of the 4V series solenoid valves. Fully driven by air signals without any electrical components or electromagnetic coils, it delivers intrinsically safe pneumatic switching performance. Designed for explosion-proof, non-power and safety interlock pneumatic circuits, it features spool-type structure, reliable sealing and high-strength aluminum alloy body, achieving perfect compatibility and interchangeability with mainstream 4V series valves.

  1.1 Standard 5-Port Interface Definition

     • P Port: Main compressed air inlet port

     • A/B Working Ports: Output ports for connecting double-acting cylinders to control extension and retraction

     • R/S Exhaust Ports: Pressure relief exhaust ports, compatible with standard muffler installation

     • Drive Mode: External pneumatic control, air signals input from bilateral control ports

     • Structure Feature: Precision slide spool design, durable aluminum alloy body, stable and long-life sealing performance

2. 5/2 Way Pneumatic Control Valve (Basic Reversing)

  2.1 Single Pneumatic Control (4A110/210/310/410)

     • Working Principle: Air pressure applied on one side control port for valve reversing; automatic spring reset after pressure release.

     • Core Characteristics: Fail-safe reset design with air cut-off, simple structure and high operational stability.

     • Typical Model: 4A210-08 (G1/8 port, single air control, 5/2 way)

  2.2 Double Pneumatic Control (4A120/220/320/420)

     • Working Principle: Alternate pressurization of bilateral air control ports; no reset spring, maintains current valve position after air cut-off with memory latching function.

     • Core Characteristics: High positioning accuracy, energy-saving operation (no continuous air supply required), stable air-off position holding.

     • Typical Model: 4A220-08 (G1/8 port, double air control, 5/2 way)

3. 5/3 Way Double Pneumatic Control Valve (Precision Intermediate Control)

  All 5/3 way 4A series models (4A130/230/330/430) adopt double pneumatic control, equipped with three professional middle position functions to meet advanced pneumatic control requirements.

     • Closed Center (C Type): All ports fully closed at middle position. Realizes cylinder locking, pressure holding and anti-falling protection for vertical and suspended stations.

     • Exhaust Center (E Type): A/B working ports communicate with exhaust ports at middle position. The system releases pressure completely, enabling free cylinder floating, manual debugging and equipment safety protection.

     • Pressure Center (P Type): P air inlet communicates with both A/B ports at middle position. Converts double-acting cylinder to single-acting output, suitable for synchronous clamping and force balance control.

4. Standard Model Coding Rules & Common Models

  1. Coding Logic: 4A [Size Code] [Control / Middle Function Code] - [Port Size]

  2.Mainstream Common Models

     • 4A210-08: Single pneumatic control, 5/2 way, G1/4 port

     • 4A220-08: Double pneumatic control, 5/2 way, G1/4 port

     • 4A230C-08: Double pneumatic control, 5/3 way closed center, G1/4 port

     • 4A310-10: Single pneumatic control, 5/2 way, G3/8 large flow port

5. Universal Core Technical Parameters (AirTAC Standard)

6. Core Product Advantages

     • Intrinsic Explosion-Proof & Safe: Pure pneumatic structure without electrical components and sparks. Fully adaptable to dusty, humid, flammable and explosive working environments, realizing zero-risk safe operation.

     • Dual Control Memory Function: Double pneumatic control models maintain valve position after air cut-off, supporting long-time positioning and pressure holding without continuous air supply, energy-saving and stable.

     • Versatile Three-Position Middle Functions: Equipped with C/E/P three middle modes to cover cylinder locking, pressure relief free floating and synchronous clamping pressure stabilization demands.

     • 100% Universal Interchangeability: Consistent installation dimensions and flow parameters with 4V series solenoid valves, enabling direct replacement and upgrade of electric control systems to pure pneumatic systems.

     • Stable & Durable Performance: Precision spool structure with low friction resistance, low startup pressure, excellent air tightness and long service life with lube-free operation.

7. Typical Application Scenarios

     • Double-acting cylinder pneumatic reversing control and equipment safety interlock systems

     • Explosion-proof zone, non-power equipment, mining, chemical and coating industry pneumatic control circuits

     • Safety pneumatic circuits requiring air cut-off reset or long-term position holding

     • Pure pneumatic logic systems composed with hand valves, mechanical control valves and pneumatic travel valves

One Sentence Summary

  The SOLH 4A series is a universal 5/2 & 5/3 way pure pneumatic directional control valve with single/double air control and three C/E/P middle functions. Featuring intrinsic safety and 4V series interchangeable dimensions, it is the preferred core component for explosion-proof, non-electric and high-safety pneumatic control circuits.