VNB201 Series Air Pilot Operated 2-Way Fluid Control Valve

Brand: SOLH by Richge Technology

Product Positioning

     VNB201 series is an external air pilot actuated 2-way fluid control valve developed by SOLH under Richge Technology. It is designed for on-off control of multiple industrial media including air, water, oil, vacuum and inert gas. Its core strengths include reliable zero-differential-pressure startup, high flow capacity and bidirectional fluid passage.

Core Key Features

     1. External Air Pilot Drive, Zero Differential Pressure Startup

     -- Fully driven by external pilot air pressure ranging from 0.25–0.7 MPa, independent of main circuit medium pressure.

     -- Stable opening and closing under harsh conditions such as vacuum, zero pressure difference and low pressure, solving the common defect of ordinary valves failing to open under low pressure.

    2. Balanced Poppet Structure, High Flow & Bidirectional Flow

     -- Balanced poppet design delivers low flow resistance, high Cv coefficient and minimal pressure loss.

     -- Supports bidirectional fluid flow, bringing greater flexibility for pipeline layout and field installation.

   3. Multiple Material Combinations for Wide Media Compatibility

     -- Valve body options: Standard brass alloy (A), corrosion-resistant stainless steel (S), lightweight aluminum alloy (L).

     -- Seal material options: Standard NBR for water & air; FKM fluoro rubber for oil resistance & high temperature resistance; EPR ethylene propylene rubber for hot water & weak acid media.

     -- Compatible media: Compressed air, water, hydraulic oil, vacuum, inert gas (N₂/CO₂), weak acid and weak alkaline liquids.

    4. Robust Structure for Severe Working Conditions

     -- Solid metal valve body with excellent anti-fouling performance, suitable for long-term continuous operation and frequent switching cycles.

     -- No internal electrical components, eliminating electric spark risks; applicable to hazardous zones with explosion-proof requirements.

    5. Flexible Installation

      Compact standalone body with standard Rc (PT) thread ports, allowing installation at any angle without directional restrictions.

Full Technical Specifications

     -- Valve Configuration: 2/2 Way, external air pilot actuated

     -- Standard Function: Normally Closed (NC); Normally Open (NO) optional

     -- Port Sizes: 10A (3/8"), 15A (1/2"), 20A (3/4"), 25A (1")

     -- Orifice Diameter: 15 mm / 20 mm

     -- Operating Pressure Range Main circuit: 0 ~ 1.0 MPa (vacuum to positive pressure) Pilot air supply: 0.25 ~ 0.7 MPa (clean dry compressed air)

     -- Proof Pressure: 1.5 MPa

     -- Temperature Range Medium temperature: -5℃ ~ +60℃ Ambient temperature: -5℃ ~ +60℃

     -- Protection Class: Standard indoor model (no IP rating, for clean indoor environments)Model Code Explanation· VNB201A-15A: Brass body + NBR seal + 1/2" port, NC air pilot valve

     -- VNB201AS-20A: Stainless steel corrosion-resistant body + NBR seal + 3/4" port

     -- VNB201AF-25A: Brass body + FKM fluoro rubber seal + 1" port (oil & high temperature resistant)

Typical Application Scenarios

     -- General industrial fluid systems: On-off control for cooling water, lubricating oil, cleaning liquid and main compressed air pipelines

     -- Vacuum & low-pressure circuits: Vacuum adsorption, negative pressure conveying and micro-pressure fluid control (zero differential pressure startup capability)

     -- Multi-media mixed pipelines: Single equipment requiring control over water, air, oil and multiple media

     -- Chemical, food & pharmaceutical industries: Stainless steel body with EPR seals for clean, mildly corrosive and sanitary-grade fluid circuits

     -- Explosion hazardous environments: Control of flammable liquids & solvents with zero electric spark risk

One Sentence Summary

     SOLH VNB201 air pilot operated valve adopts external pilot drive with zero differential pressure startup, high bidirectional flow and interchangeable body & seal materials; it is an all-purpose air actuated fluid shut-off valve optimized for industrial applications demanding high reliability including low pressure, vacuum, large flow, multi-media and explosion-proof working conditions.