3F / 3FM Series 3/2 Way Foot Pedal Valve | Normally Closed Direct Acting Pneumatic Foot Valve

Brand: SOLH by Richge Technology | Full Compatible Replacement for AirTAC 3F / 3FM Foot Valve

1. Product Overview

     The SOLH 3F and 3FM series are 3/2 way direct-acting normally closed pneumatic foot pedal valves, fully compatible and interchangeable with original AirTAC 3F210 and 3FM210 models. The 3F210 adopts heavy-duty die-cast aluminum housing, while the 3FM210 features a lightweight mini plastic structure. Both series adopt built-in exhaust design with standard P/A/R air port logic. Serving as hands-free pneumatic switching devices, they are widely used for single-acting cylinder control, vacuum breaking, manual jog air circuit on-off, stamping and fixture clamping control.

  1.1 Core Air Port Logic & Working Principle

     • Air Port Definition: P (air inlet), A (working outlet), R (built-in exhaust port)

     • Normally Closed State (Pedal Released): P inlet closed, A port communicates with R exhaust port to release cylinder residual pressure instantly

     • Working State (Pedal Pressed): P-A circuit opens for air supply, R exhaust port closed to maintain pressure

     • Locking Function (L Suffix): Equipped with locking tab structure. Press once to lock the pedal for continuous air supply; press again to unlock and reset pressure relief

     • Standard Function: Non-L models are instant self-reset type, automatically cutting off air and releasing pressure after foot release

2. Model Coding Rules & Definition

     Coding Logic: 3(F/FM)210 - [Port Size] [L Locking] - [Thread Type]

  2.1 Series Housing Definition

     • 3F210: Standard heavy-duty aluminum alloy housing 3/2 way foot valve

     • 3FM210: Mini lightweight plastic foot valve, compact size for narrow space installation

  2.2 Port Size Specification

     • M5: M5×0.8 fine thread (exclusive for 3FM mini model, micro pilot air control)

     • 06: G1/8 (PT1/8) standard thread

     • 08: G1/4 (PT1/4) mainstream universal specification for industrial tooling

  2.3 Function & Thread Suffix

     • L Suffix: With self-locking structure for long-time pressure holding

     • No L: Instant self-reset type, automatic pressure relief after pedal release

     • Thread Type: Blank=PT taper thread; G=British standard parallel thread; T=NPT American taper thread

     Model Example: 3F210-08L | G1/4 port aluminum alloy foot valve with self-locking function; 3FM210-M5 | M5 thread mini plastic micro foot valve

  2.4 Full Series Specification Comparison Table

3. Core Technical Parameters

4. Selection Distinction: 3F Aluminum Series vs 3FM Mini Plastic Series

5. Functional Distinction: Self-Reset vs Self-Locking

     • Non-L Instant Self-Reset Type: The pedal rebounds automatically after foot release, cutting off air supply and releasing pressure from port A. It is the most common type for jogging and intermittent control scenarios.

     • L Suffix Self-Locking Type: Press once to lock the pedal for continuous air supply and pressure holding; press again to unlock and release residual pressure. Specially designed for long-time pressure maintaining pneumatic circuits.

6. Replacement & Typical Applications

  6.1 Compatible Replacement

     SOLH 3F/3FM series fully replaces original AirTAC 3F210/3FM210 series and domestic Xinchang/SOLIH equivalent models, and can directly upgrade and replace old FV320 foot pedal valves with perfect dimensional and functional compatibility.

  6.2 Typical Application Scenarios

     • Single-Acting Cylinder Foot Control: Air source → 3F foot valve → single-acting cylinder; the cylinder automatically returns and releases pressure when the pedal is released, realizing safe intermittent operation.

     • Vacuum Suction Cup Pressure Relief: Step to supply air to cut off vacuum; release the pedal to exhaust air and eliminate suction cup holding force for quick workpiece release.

     • Industrial Processing Control: Manual foot switching for small stamping machines, grinders and pneumatic fixture clamping systems, freeing hands for efficient operation.

One Sentence Summary

     SOLH 3F/3FM series 3/2 way normally closed foot pedal valves include heavy-duty aluminum self-reset/self-locking models and mini lightweight plastic models. Featuring IP54 dustproof & splash-proof performance, lube-free operation and full AirTAC compatibility, they are the standard hands-free pneumatic switching valves for cylinder control, vacuum breaking and industrial tooling operation.