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    • 2-Way Solenoid Valves

    Source 2-way solenoid valves from India's verified manufacturers and exporters on Himalay. Browse the full range for industrial and export applications.

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    1 items
    operation type
    Solenoid Coil
    body material
    Brass
    SS304
    SS316
    end connection
    Threaded
    seat material
    EPDM
    NBR
    PTFE
    trim material
    SS304
    2-Way Solenoid Valve
    2-Way Solenoid Valve$8 - $60
    2-Way Solenoid Valves sourcing

    About 2-Way Solenoid Valves

    2/2 normally closed and normally open solenoid valves for electrical shut-off of water, air, gas, steam and oils, in brass, stainless steel and plastic, DN6 to DN80.

    A 2-way solenoid valve is the basic electrically operated shut-off valve: one inlet, one outlet, and a coil that opens or closes the single flow path. Normally closed (2/2 NC) valves open when energised and close on power loss, making them the default for shut-off, dosing, drain and safety duties; normally open (2/2 NO) valves do the reverse and suit cooling or purge lines that must stay open if power fails. Small sizes are direct acting and work from zero pressure differential, while DN15 and above are usually servo-assisted diaphragm or piston designs that need a minimum differential to open. Indian manufacturers commonly supply forged brass bodies for water, air and neutral media, CF8M/SS316 for steam, aggressive media and hygienic service, and engineering plastics for irrigation and appliance duty, with NBR, EPDM, FKM or PTFE seals, coils from 12 V DC to 230 V AC in class F or H insulation, and IP65 DIN-plug or NEMA 4X terminations. When enquiring, state port size, orifice or Kv, NC or NO function, medium and temperature, maximum and minimum pressure differential, body and seal materials, coil voltage, duty cycle and quantity.

    Buyer guide

    Specifying 2-Way Solenoid Valves: Function, Operation, Seals and Coils

    01

    What the valve does

    A 2-way (2/2) solenoid valve has one inlet and one outlet and one job: to open or close a line electrically. The de-energised state defines the function. Normally closed (NC) valves open when the coil is powered and are the default for shut-off, dosing and safety duties, because loss of power closes the line. Normally open (NO) valves are specified where power failure must leave the line open, such as cooling water or quench circuits.

    02

    Direct acting or pilot operated

    Up to roughly DN10 and at modest pressures, direct acting valves lift the seat straight off the orifice with coil force and operate from zero pressure differential. Larger sizes use a servo-assisted diaphragm or piston, which needs a minimum differential, typically 0.2 to 0.5 bar, to open fully; assisted-lift designs bridge the gap where flow is large but a differential cannot be guaranteed. Confirming the true minimum operating differential is the single most common mis-specification in this category, so check it before anything else.

    03

    Body and seal materials

    Forged brass suits water, air and neutral media. CF8M/SS316 investment castings cover aggressive media, steam and hygienic duties. Glass-filled nylon and PVC bodies serve irrigation, appliance and low-cost water service. Seals set the media envelope: NBR for water, air and oils to about 80 degrees C; EPDM for hot water (never oils); FKM for fuels and solvents; PTFE for steam to about 180 degrees C and aggressive chemicals.

    04

    Coils and electrics

    Standard offers cover 12/24 V DC and 24/110/230 V AC, class F or H insulation, continuous ED 100% duty and DIN-type plug connection with IP65 protection; IP67 moulded-cable and NEMA 4X versions suit washdown and coastal sites. For hazardous areas specify flameproof Ex d or encapsulated Ex m coils certified to ATEX/IECEx, or IS/IEC 60079 for Indian installations. Appliance-grade water valves are built and tested to IEC 60730-2-8, and VDE 0580 governs the electromagnet assembly itself.

    05

    Sizes and connections

    DN6 to DN50 screwed BSP or NPT is the industry core; DN65 to DN80 and flanged ends are available from larger Indian works, with PN and ASME class ratings both common.

    What to state in your enquiry

    Port size and thread standard, orifice or Kv required, function NC or NO, medium and its temperature, maximum and minimum pressure differential, body and seal material, coil voltage and frequency, duty cycle, enclosure or hazardous-area rating, quantity and delivery schedule. Indian manufacturers routinely support third-party inspection, test certificates and export packing, so state inspection requirements up front.

    Submit an enquiry →
    Technical guide

    How 2-Way Solenoid Valves Work

    The core mechanism

    Every solenoid valve is an electromagnet wrapped around a sealed stainless core tube containing a spring-loaded plunger. In a normally closed valve the spring presses the plunger, tipped with an elastomer or PTFE insert, onto the orifice. Energising the coil creates magnetic flux that pulls the plunger up the core tube against the spring, lifting the seal off the orifice and opening the path. De-energise, and the spring plus line pressure reseats it. A normally open valve inverts the linkage so that coil force closes the seat instead. There is no gland or dynamic external seal; the media is contained by the core tube, which is why solenoid valves are inherently tight to atmosphere.

    Direct acting versus servo assisted

    In a direct acting valve, the coil alone must overcome spring force plus line pressure acting on the orifice area. Force scales with coil size, so orifices stay small. Servo-assisted diaphragm valves get around this: line pressure bleeds through a small hole in the diaphragm into the chamber above it, pressure-balancing the diaphragm shut. The plunger seals only a tiny pilot orifice in the diaphragm centre. Energising opens the pilot, the upper chamber vents downstream faster than the bleed refills it, and line pressure lifts the whole diaphragm. This is why such valves need a minimum differential: without it there is no pressure to do the lifting, and the valve cracks the pilot but never opens the main seat.

    AC and DC behaviour

    AC coils draw a high inrush current while the magnetic circuit is open, which gives them stronger pull and typically higher pressure ratings than the same frame on DC, but a plunger that fails to seat fully will hold the coil at inrush current and burn it out. Shading rings suppress 50 Hz hum. DC coils draw constant current, run cooler dynamics but with lower maximum differential pressure ratings.

    Failure modes worth designing against

    Coil burnout comes from overvoltage, ambient plus media heat exceeding the insulation class, or a jammed plunger on AC. Weeping across the seat is almost always debris; fit a strainer upstream, particularly on diaphragm valves whose pilot orifice can block with scale. Fast closure of a large valve on water produces hammer, so consider soft-closing or slower piston designs on long liquid lines. Elastomer swell from an incompatible medium seizes the plunger. Mounting matters too: most valves want the coil upright and horizontal flow, and derate or misbehave inverted.

    Why the ratings matter

    MOPD, the maximum operating pressure differential, is the highest differential at which the coil can still open the valve; exceed it and an energised valve simply stays shut. Kv describes flow, and the orifice diameter, not the pipe connection, sets it. Two valves with identical port sizes can differ threefold in flow, which is why an enquiry should state Kv or the duty flow and pressure drop rather than pipe size alone.

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    Frequently Asked Questions

    Normally closed or normally open — which 2-way solenoid valve should I specify?
    Do I need a direct acting valve or is a diaphragm type acceptable?
    Which seal material for hot water, steam or oils?
    What should my enquiry include for an export order from India?
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