VHK Series 2/2 & 3/2 Way Knob Manual Valve | Finger Rotary Valve Compatible with SMC VHK Series

Brand: SOLH by Richge Technology | Full Interchangeable Replacement for SMC VHK Original Series

1. Product Overview

     The SOLH VHK series is a mini knob-type manual cut-off valve divided into VHK2 2/2 way and VHK3 3/2 way types. It adopts 90° rotary knob design to realize pneumatic circuit on-off control. The 3/2 way model features built-in hidden exhaust structure that automatically releases residual pressure from port A when closed, with no external R exhaust port required. Designed for inline direct pipeline installation without extra base mounting, it serves as an ideal manual switch for pneumatic branch tubes, safety pressure relief valve in front of solenoid valves, and vacuum circuit on-off control. The full series is fully dimensionally and functionally compatible with original SMC VHK series for direct interchangeable replacement.

  1.1 Core Identification & Operation Logic

     • Knob Color Marking: Grey knob for VHK2 2-way type; Blue knob for VHK3 3-way type, achieving visual quick identification

     • Switch Logic: Counterclockwise 90° rotation for valve opening; Clockwise 90° rotation for valve closing, with clear knob pointer status indication

     • Sealing Structure: Poppet valve sealing design delivers excellent airtight performance with ultra-low micro leakage. Ultra-light operating torque (0.04~0.14N·m) allows easy finger rotation and switching

2. Model Coding Rules & Interface Specification

     Coding Logic: VHK[2/3][A]-[Front Port Spec]-[Rear Port Spec]

  2.1 Model Definition

     • VHK2: 2/2 way single cut-off type

     • VHK3: 3/2 way cut-off + residual pressure relief type

     • A Suffix: New upgraded anti-drop knob structure (improved version); No A for standard old version

     • R Suffix: Flame-retardant fireproof valve body

  2.2 Port Type Code Definition

     • F Code: Push-fit port for PU nylon hose connection

     • S Code: External thread port for threaded pipeline connection

  2.3 Model Application Examples:

     • VHK3A-08F-02S: 3/2 way upgraded anti-drop knob valve, P port φ8 push-fit, A port G1/4 external thread

     • VHK2-06F-06F: 2/2 way standard valve, dual-port φ6 push-fit straight through type

  2.4 Full Series Complete Interface Specification List

3. Core Technical Parameters

4. Core Functional Distinction (Key Selection Guide)

  4.1 VHK2 2/2 Way (Grey Knob)

     • Open State: P⇋A fully conducted for stable air supply

     • Closed State: P and A ports completely cut off with no exhaust function

     • Core Application: Pure pipeline on-off control, widely used for vacuum circuit holding and main air source switch

  4.2 VHK3 3/2 Way (Blue Knob)

     • Open State: P→A air intake conduction for normal equipment operation

     • Closed State: P port closed, A port automatically exhausts residual pressure through built-in hidden channel

     • Core Advantage: One-key residual gas emptying after shutdown, eliminating residual pressure hazards and ensuring safe valve disassembly and equipment maintenance

5. Structural Core Advantages

     • Four Universal Pipeline Combinations: Support F-F dual push-fit, S-S dual external thread, F-S P-push/A-thread, S-F P-thread/A-push connection modes, fully adaptable to various on-site pipeline layouts

     • Optional Fixed Bracket: Equipped with snap-on mounting bracket for optional panel and cabinet fixed installation, flexible installation methods

     • Upgraded VHK-A Anti-Drop Structure: Optimized knob anti-loosening design, effectively preventing knob falling off during high-frequency repeated operation, improving service stability

     • Mini Compact Size: Ultra-small body design, perfectly suitable for wire troughs, narrow equipment gaps and compact micro pneumatic circuits

     • Excellent Sealing Performance: Precision poppet sealing structure achieves ultra-low micro leakage, ensuring long-term stable airtight operation

6. Selection Distinction: VHK Knob Valve vs HSV Hand Slide Valve

7. Typical Application Scenarios

     • Solenoid Valve Front Safety Pressure Relief: Air source → VHK3 → solenoid valve. The 3-way valve automatically empties residual pressure behind the valve when closed, realizing safe disassembly and maintenance of pneumatic components without pressure risk.

     • Vacuum Circuit On-Off Control: VHK2 2-way valve installed on the suction cup vacuum pipeline, cutting off vacuum pressure stably after shutdown to maintain vacuum holding effect and avoid air leakage failure.

     • Tooling Micro Cylinder Branch Switch: Applied to local manual start-stop control of micro cylinder air source, convenient for single equipment debugging, maintenance and independent circuit switching.

One Sentence Summary

     The SOLH VHK series is a mini 90° rotary finger manual valve fully compatible with SMC original VHK series. With 2-way cut-off and 3-way residual pressure relief dual functions, diversified thread/push-fit interface combinations and ultra-light operation, it is the optimal mini manual switch valve for pneumatic branch circuits, pilot control and vacuum system safety protection.