2W Series 2/2 Way Fluid Solenoid Valve (Direct-Acting + Pilot-Operated)

Brand: SOLH by Richge Technology

Product Overview

     SOLH 2W series is universal industrial 2/2-way normally closed fluid shut-off solenoid valve, split into two structural lines: direct-acting 2W (030/050 small series) and pilot-operated 2W (150~500 large bore series). It performs automatic on/off control for clean water, compressed air, lubricating oil, cooling cutting fluid and weakly corrosive liquid pipelines.

       * Brass valve body with multi-layer anti-corrosion sealing; dual options of zero-pressure startup direct type and high-flow pilot type for full range selection

       * Standardized dimension & thread specs, compatible with PT/G/NPT multi-thread for global export

       * Low-temperature resistant coil supports stable long-term continuous energization

     Widely matched with water treatment equipment, machine tool cooling circuits, spray cleaning lines, air compressor pipelines and full-industry fluid automation systems.

Two Product Lines Full Classification: Direct-Acting NC VS Pilot-Operated NC

  1.  2W Direct-Acting Normally Closed (Model Example: 2W-L030-08)

     -- Working Principle:Electromagnetic coil directly drives internal armature stem to open/close the main valve seat, enabling full opening under 0MPa zero medium pressure.

        * Power OFF: Spring compresses sealing gasket to fully cut off pipeline fluid

        * Power ON: Electromagnetic force lifts spool to realize bidirectional fluid circulation

           No auxiliary pilot chamber, ultra-simple structure with millisecond fast response speed.

    -- Complete Model Coding Rule

     2W - Pressure/Flow Suffix - Size Series - Port Thread - Coil Voltage - Wiring Type - Thread Standard

        * 2W: Direct-acting 2/2-way normally closed solenoid valve

        *  Pressure & flow suffix: Blank=Standard / L=Large Flow / T=Extra Large Flow / H=High Pressure / X=Extra High Pressure

        *  Size series: 030 (miniature), 050 (medium small)

        *  Port code: 06=G1/8, 08=G1/4, 10=G3/8, 15=G1/2

        *  Voltage code: A=AC220V, B=DC24V, C=AC110V, E=AC24V, F=DC12V

        *  Wiring mode: Blank=DIN socket (standard for control cabinet), I=waterproof wire lead (outdoor humid equipment)

        *  Thread standard: Blank=PT British taper thread, G=G parallel thread, T=NPT American thread

   --  Core Advantages

       *  Zero differential pressure startup, no minimum operating pressure limit, stable opening under vacuum, micro-pressure and micro-flow water circuits

        *  Ultra-compact body, arbitrary mounting angle for cramped equipment cabinet layout

        *  Millisecond fast on-off response, suitable for high-frequency intermittent start-stop cycles

        *  Small valve body with low consumable cost, economical first choice for single-point branch control

     --  Application Scenarios

      Single-point cooling oil injection for small CNC machine tools, mini spray cleaning machines, micro air/water control for 3C automation equipment, small branch switches of air compressors, lab micro fluid on/off control.

  2. 2W Pilot-Operated Normally Closed (Model Example: 2W250-25)

     -- Working Principle: Built-in pilot bleed orifice, relying on pipeline medium pressure to lift large-bore main spool; coil only controls tiny pilot hole with low power consumption & low heat generation. Minimum startup differential pressure 0.05MPa, valve cannot fully open without medium pressure.

        * Power OFF: Pilot hole sealed, internal cavity pressure compresses seal to shut pipeline

        * Power ON: Pilot chamber pressure bleeds, medium pressure jacks open main valve for high-volume fluid flow, max orifice up to Φ50 (G2 inch)

     -- Complete Model Coding Rule

        2W - Orifice Size - Port Thread - Coil Voltage - Wiring Type - Thread Standard

        *  2W: Pilot-operated 2/2-way normally closed solenoid valve

        *  Standard orifice size: 150(Φ15), 200(Φ20), 250(Φ25), 320(Φ35), 400(Φ40), 500(Φ50)

        *  Port code: 15=G1/2, 20=G3/4, 25=G1, 32=G1¼, 40=G1½, 50=G2

        *  Voltage, wiring & thread codes fully interchangeable with direct-acting series, compatible coil spare parts

  3. Core Advantages

     -- Extra large straight-through bore for high medium flow, ultra-low pipeline pressure loss, ideal for whole-line centralized water/air supply mains

     -- Low-power coil drives large-bore valve body, low temperature rise under 24h continuous operation, anti-burn performance

     -- Wide flow channel not easy to clog, supports circulating industrial cooling water with tiny suspended impurities

     -- Single pilot valve can replace multiple small direct valves, simplify main pipeline layout & reduce procurement cost

  4. Application Scenarios

     Main water circuit control for large assembly line spray cleaning equipment, air compressor full machine drain & main air pipeline shut-off, circulating cooling system large-flow header pipes, water treatment equipment, general fluid master switch for food packaging & chemical equipment.

Universal Shared Core Features (Direct + Pilot Operated)

  1. Uniform NC Normally Closed Function (Factory Default)

     Auto shut-off when power cut, effectively prevent overflow, water/air leakage during equipment shutdown for higher system safety protection.

  2. Dual Optional Seal Materials

     -- Standard NBR nitrile rubber: Universal for clean water, compressed air & lubricating oil general working conditions

     -- Optional EPDM ethylene propylene: Heat-resistant, weak acid & alkali resistant, dedicated for hot water, food-grade clean fluid & pickling equipment

  3. Multi-spec Universal Compatible Coils

     Full AC & DC voltage coverage, low-power insulated coil supporting long-term continuous energization; dual wiring schemes (DIN socket / waterproof wire lead) adaptable to indoor cabinet & outdoor equipment wiring.

  4. Multi International Export Thread Standards

     Three thread options: PT British taper, G parallel BSPP, NPT American thread, matching domestic automation equipment and overseas production line export demands.

  5. Gravity-Free Universal Mounting

     Valve body can be installed vertically, horizontally or inverted without affecting opening/closing performance, perfect for compact cabinet layout.

  6. Full Pressure Grade Customization

     Direct series supports standard / high pressure / extra high pressure / large flow customized versions; pilot series natively adapts to conventional industrial fluid pressure range 0.05~1.0MPa.

Unified General Technical Specification Table

Direct VS Pilot Operated Full Selection Comparison Table

Segmented Typical Application Scenarios

  1. 2W Direct-Acting NC Applicable Fields

     -- Single-point cooling oil injection & micro spray for small CNC machine tools, simple station micro fluid control

     -- Vacuum auxiliary water supply & small pneumatic branch on/off for 3C automation equipment

     -- Small ultrasonic cleaning equipment, laboratory micro fluid control loops

     -- Equipment maintenance branch, single-point water/gas switch for small fixtures

  2. 2W Pilot-Operated NC Applicable Fields

     -- Air compressor full machine drain, workshop main air pipeline cut-off valve

     -- Master water circuit control for large assembly line spray cleaning equipment

     -- Water treatment circulation system, industrial cooling large-flow header pipes

     -- Large-bore fluid master switch for food packaging & complete chemical equipment

Core Selection Judgment Rules

     -- Pipeline water/air pressure below 0.05MPa, intermittent micro medium, vacuum circuit → Must select 2W direct-acting type

     -- Pipe size ≥G1/2, whole-line main pipe high-flow transmission, long-term stable pressure pipeline → Select 2W pilot-operated type

     -- Hot water, purified water, weak acid fluid working conditions: Specify EPDM food-grade seal when placing orders

     -- Centralized wiring inside machine control cabinet: Prioritize DIN socket wiring type; outdoor spray & humid equipment choose I waterproof wire lead type

     -- High-pressure water circuit & high-flow stations can select customized valve bodies with suffix H/L/T

Matched Complete Pneumatic & Fluid Circuit Solutions

  1. Small Cooling Branch Circuit

     AFC air service unit → 3V series 3/2 solenoid valve → PU plastic tubing → 2W direct-acting valve (cooling water circuit on/off control)

  2. Complete Machine Main Water Header Circuit

     Water tank / air compressor main pipe → 2W pilot large-bore valve → branch delivery to each station spray pipeline

  3. Explosion-Proof Fluid Workshop Circuit

     Explosion-proof air source treatment unit → 2W pilot valve with custom explosion-proof coil, matched with explosion-proof automatic control pipelines

One Sentence Summary

     SOLH 2W series brass 2/2-way normally closed fluid solenoid valve provides zero-pressure startup small direct-acting variant and low-power high-flow large pilot-operated variant, with optional NBR/EPDM food-grade seal, multi-thread & multi-voltage compatibility, widely used for automatic water, air, oil shut-off control on machine tools, spray washing lines, water treatment and food packaging fluid automation equipment.