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DFD Threaded 2-Way 2-Position (Normally Open) Solenoid Valve

DFD Threaded 2-Way 2-Position (Normally Open) Solenoid Valve

  • Model:DFD-15K/DFD-20K/DFD-25K/DFD-32K/DFD-40K/DFD-50K/DFD-80K
  • Specification:DN15-DN80
  • Temperature:-20~65 ℃
  • Medium:Water, Liquid, Gas, Light Oil(≤20cst)
  • Pressure:0.3~16bar
  • Connection method:Threaded
  • Driving method:Pilot-Operated
  • Material:Water, Liquid, Gas, Light Oil(≤20cst)
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DFD Threaded 2-Way 2-Position (Normally Open) Solenoid ValveOverview

The DFD series thread connection 2/2-way solenoid valve is a high-performance, widely applicable pilot-operated automated control valve. Depending on system control configurations, it is available in normally closed (opens when energized, closes when de-energized) and normally open (closes when energized, opens when de-energized, designated with a "K" suffix) types. Featuring a standard pipe thread connection structure, it greatly simplifies the installation process in industrial and civil piping systems. Its core design focuses on high flow rates, low pressure drops, and bubble-tight shut-off performance, enabling rapid and reliable on-off control for various media including water, liquids, gases, and light oils (≤ 20 cSt). The valve body options include premium brass, SS304, and SS316 stainless steel. Coupled with a highly efficient electromagnetic coil actuator, it ensures absolute safety and an extended service life for piping systems under high-frequency switching and thermal shocks alternating from -20°C to 65°C.

Product Image:DFD Threaded 2-Way 2-Position (Normally Open) Solenoid Valve

DFD Threaded 2-Way 2-Position (Normally Open) Solenoid ValveCharacteristic

Rapid Threaded Integration: Uses international standard pipe thread interfaces (such as G or NPT) to allow quick and convenient installation and disassembly within confined spaces without complex welding or flanging processes, significantly improving modular maintenance efficiency.

Efficient Pilot-Operated Drive: Employs a pilot-operated diaphragm structure that utilizes the medium's own differential pressure to effortlessly open and close large-orifice valves. The coil has low power consumption, rapid action, and high responsiveness. The normally open and normally closed models perfectly match different fail-safe modes.

Excellent Media Compatibility: Offers multiple valve body materials including brass, 304 stainless steel, and 316 stainless steel. The sealing pair utilizes high-performance elastomers or modified FKM, ensuring no impurity precipitation during long-term contact with water, gas, or light oil, thus maintaining high media purity.

Precision Leak Prevention & Longevity: The valve body flow channels are optimized via computational fluid dynamics (CFD) to provide ultra-high flow capacity and minimal pressure drop. Combined with precisely machined pilot holes and balance holes, it supports nominal pressures from 0.3 to 16 bar, guaranteeing tight, zero-leakage closure.

Lightweight & Compact Footprint: Specifically developed for modern, high-density fluid piping and equipment integration, it dramatically eliminates the redundant volume and weight of traditional automated valves, offering extreme flexibility for complex spatial layouts.

DFD Threaded 2-Way 2-Position (Normally Open) Solenoid Valvestructure principle

Structure Diagram:DFD Threaded 2-Way 2-Position (Normally Open) Solenoid Valve

Material List


No.Part Name
1Valve Body
2Valve Body O-ring
3Diaphragm Assembly
4Diaphragm Spring
5Valve Cover (Bonnet)
6Screw, Spring Washer
7Spacer O-ring
8Plunger Assembly (Movable Core Assembly)
9Plunger Spring (Core Spring)
10Armature Tube Assembly
11Solenoid Coil (Plastic Encapsulated)
12Internal Tooth Lock Washer
13Hexagon Fine Thread Nut
14Terminal Box Seal Gasket
15DIN43650A Terminal Box
16Terminal Box Fixing Screw


DFD Threaded 2-Way 2-Position (Normally Open) Solenoid Valvetechnology parameter

Flow Curve Chart

Specification Sheet

Thread GOrifice mmCv ValueMin. Operating Pressure (bar)Max. Operating Pressure (bar) ACMax. Operating Pressure (bar) DCMax. Fluid Temp. ℃Sealing MaterialCoil Insulation ClassCoil Power Regular VA (AC 220V)Coil Power Regular W (DC 24V)Coil Power ES Coil VA (AC 220V)Coil Power ES Coil W (DC 24V)Standard Model (Brass Body)Standard Model (Stainless Steel Body)
1/2"134.50.38880NBRH18206DFD-15K-AC220VDFD-15JK-AC220V
134.50.388130EPDMH1820DFD-15K-E-AC220VDFD-15JK-E-AC220V
134.50.388120VITONH1820DFD-15K-V-AC220VDFD-15JK-V-AC220V
3/4"187.20.38880NBRH18206DFD-20K-AC220VDFD-20JK-AC220V
187.20.388130EPDMH1820DFD-20K-E-AC220VDFD-20JK-E-AC220V
187.20.388120VITONH1820DFD-20K-V-AC220VDFD-20JK-V-AC220V
1"23120.38880NBRH18206DFD-25K-AC220VDFD-25JK-AC220V
23120.388130EPDMH1820DFD-25K-E-AC220VDFD-25JK-E-AC220V
23120.388120VITONH1820DFD-25K-V-AC220VDFD-25JK-V-AC220V
1'1/4"32240.38880NBRH18206DFD-32K-AC220VDFD-32JK-AC220V
32240.388130EPDMH1820DFD-32K-E-AC220VDFD-32JK-E-AC220V
32240.388120VITONH1820DFD-32K-V-AC220VDFD-32JK-V-AC220V
1'1/2"40300.38880NBRH18206DFD-40K-AC220VDFD-40JK-AC220V
40300.388130EPDMH1820DFD-40K-E-AC220VDFD-40JK-E-AC220V
40300.388120VITONH1820DFD-40K-V-AC220VDFD-40JK-V-AC220V
2"50480.38880NBRH18206DFD-50K-AC220VDFD-50JK-AC220V
50480.388130EPDMH1820DFD-50K-E-AC220VDFD-50JK-E-AC220V
50480.388120VITONH1820DFD-50K-V-AC220VDFD-50JK-V-AC220V
3"80820.38880NBRH18206DFD-80K-AC220V
80820.388130EPDMH1820DFD-80K-E-AC220V
80820.388120VITONH1820DFD-80K-V-AC220V

1. Max. Operating Pressure applies to: Air, Gas, Water, Hot Water, Liquid, Light Oil.

2. The table shows standard plastic encapsulated coil AC220V with G thread interface. Sealing material: Blank for NBR, E for EPDM, V for VITON.

3. Note: Solenoid valves with ES coils can use EPDM or VITON seals, but fluid temperature must be ≤ 80°C.

Note: Fluid temperature for ES coils ≤ 80°C; fluid temperature for Ex-proof encapsulated coils is -10 to 60°C


DFD Threaded 2-Way 2-Position (Normally Open) Solenoid Valvestandard size

Outline Diagram:DFD Threaded 2-Way 2-Position (Normally Open) Solenoid Valve

Outline Dimension Table   (Unit:mm)


Product ModelABCDWeight (Kg) - CopperWeight (Kg) - Stainless Steel
DFD-15K80451201060.70.7
DFD-20K87521301130.90.8
DFD-25K107671401191.31.1
DFD-32K130841481231.91.7
DFD-40K145951661372.52.3
DFD-50K1771281831464.34
DFD-80K25019524018011.5