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

Brand: SOLH by Richge Technology 

Product Overview

  1. SOLH 2S series are 2/2-way normally closed fluid shut-off solenoid valves, split into two full product lines:

     -- Direct-Acting 2S (030 / 050 small orifice series)

     -- Pilot-Operated 2S (150~500 large orifice series)

  2. Designed for automatic on/off control of clean water, compressed air, lubricating oil, cooling cutting fluid and weakly corrosive liquid pipelines. Compact integrated structure with leak-proof sealing; coils support long-term continuous energization.

     -- Direct-acting type: Full opening under 0MPa zero differential pressure, ideal for low-pressure micro-fluid branches

     -- Pilot-operated type: Large bore & high flow capacity for main supply pipelines with large pipe sizes

  3. Widely matched with machine tool cooling circuits, cleaning spray lines, air compressor drain systems, water treatment equipment, food packaging fluid automation.

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

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

     -- Working Principle：No auxiliary pilot air chamber; electromagnetic coil directly pulls the armature stem to open/close the valve seat. Fully open even under 0MPa zero water/air pressure。

        * Power OFF: Spring presses seal to fully cut off pipeline fluid；

        * Power ON: Coil pulls armature upward to open valve port for fluid passage

     -- Complete Model Coding Rule：2S - Pressure Suffix - Size Series - Port Thread - Coil Voltage - Wiring Type - Thread Standard

        * 2S: Direct-acting 2/2 way NC solenoid valve

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

        * Size series: 030 (mini), 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: Blank=DIN plug socket, I=Cable wire lead type

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

     -- Core Advantages：

        *Zero differential pressure startup, no minimum operating pressure limit, stable operation for micro low-pressure fluid circuits

        * Ultra-compact body, arbitrary mounting angle without gravity restriction

        * Millisecond fast response for rapid on-off switching cycles

     -- Application Scenarios：

       Small CNC machine tool cooling oil spray, mini washing machine micro spray, 3C equipment micro air/water cut-off, vacuum auxiliary water supply, small branch pipelines (G1/8 ~ G1/2).

  2.  2S Pilot-Operated Normally Closed Series

     -- Working Principle：Built-in miniature pilot control orifice; relies on medium pipeline pressure to lift the main diaphragm/spool. Minimum 0.05MPa differential pressure required for full opening. Coil only controls small pilot bleed hole with low power consumption.

        * Power OFF: Pilot hole sealed, upstream pressure compresses main seal to shut pipeline

        * Power ON: Pilot chamber pressure bleeds, medium pressure lifts main spool for high-volume fluid flow; max orifice size up to Φ50 (G2 inch)

     -- Complete Model Coding Rule： 2S - Orifice Size - Port Thread - Coil Voltage - Wiring Type - Thread Standard

        * 2S: Pilot-operated 2/2 way NC solenoid valve

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

        * Port code: 15=G1/2, 20=G3/4, 25=G1, 32=G1-1/4, 40=G1-1/2, 50=G2

        * Voltage / wiring / thread codes fully consistent with direct-acting variants

     -- Core Advantages：

        * Large straight-through bore, ultra-high flow rate, minimal pipeline pressure drop for whole-line centralized water/air supply mains

        * Tiny low-wattage coil drives large bore valve body, low heat generation, suitable for 24h non-stop continuous operation

        * Wide flow channel not easy to clog, compatible with industrial circulating cooling water containing minor suspended impurities

     -- Application Scenarios：

        Air compressor main intake/drain pipelines, large assembly line spray cleaning main water circuits, bulk water treatment header pipes, stamping equipment cooling main oil lines, heavy-duty industrial water supply systems.

Universal Shared Product Features (Direct + Pilot Operated)

  1. Standard Normally Closed (NC) Function Factory Default

     Auto shut-off when power cut, prevents fluid overflow and leakage during equipment shutdown for higher system safety.

  2. Multiple Optional Seal Materials

     -- Standard NBR nitrile rubber: Universal for water, air, lubricating oil

     -- Optional EPDM ethylene propylene: Acid/alkali resistant, hot water & food-grade clean fluid dedicated

  3. Durable High-Temp Low-Power Coil

     Heat-resistant insulation coil for long continuous energization, anti-burn stable insulation; dual wiring options (DIN socket / wire lead) for flexible cabinet layout.

  4. Multi International Thread Standards for Export

     PT British taper, G BSP parallel, NPT American thread optional, compatible with domestic automation and overseas production lines.

  5. Full Pressure Graded Customization

     Direct-acting series supports standard / large flow / high / extra-high pressure customization; pilot series native rated for standard industrial fluid pressure 0.05~1.0MPa.

  6. Gravity-Free Universal Mounting

     Can be installed vertical, horizontal or inverted, fits cramped electrical cabinet internal layout.

Unified General Technical Specification Table

Direct VS Pilot Operated Full Selection Comparison Table

Segmented Typical Application Scenarios

  1. Direct-Acting NC Application Range

     -- Single-point cooling oil injection & micro spray for small CNC machine tools

     -- Vacuum auxiliary water supply & mini air circuit on/off for 3C automation equipment

     -- Small ultrasonic cleaning machines, lab micro fluid control loops

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

  2. Pilot-Operated NC Application Range

     -- Air compressor complete machine drain & main air pipeline shut-off

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

     -- Bulk water treatment equipment & high-flow circulating cooling header pipes

     -- Food packaging, chemical equipment large bore fluid main shut-off valve

Core Selection Judgment Rules

     -- Pipeline static pressure ＜0.05MPa, intermittent micro fluid supply → Must choose direct-acting 2S

     -- Pipe size ≥G1/2, high-flow main header, stable long-term water/air pressure → Select pilot-operated 2S

     -- Hot water, food-grade, weak acid/alkali medium: Specify EPDM seal when placing order

     -- Centralized wiring inside machine control cabinet: Prioritize DIN socket wiring type

     -- Outdoor humid equipment: Choose wire lead type with waterproof cable gland

Matched Complete Pneumatic & Fluid Circuit Solutions

  1. Small Cooling Branch Circuit

     -- AFC air service unit → 3V series 3/2 solenoid valve → PU tubing → 2S direct-acting valve (cooling water loop control)

  2. Complete Machine Main Water Header Circuit

     -- Water tank / air compressor main pipe → 2S pilot large bore valve → multi-station spray branch lines

  3. Explosion-Proof Fluid Workshop Circuit

     -- Explosion-proof air source treatment unit → 50-VPE explosion-proof 3-way valve + custom explosion-proof coil 2S pilot valve

One Sentence Summary

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