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  • DFD Threaded 2-Way 2-Position (Normally Closed) Solenoid Valve

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

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

  • Model:DFD-15/DFD-20/DFD-25/DFD-32/DFD-40/DFD-50/DFD-80
  • 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:Brass, 304 Stainless Steel, 316 Stainless Steel
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DFD Threaded 2-Way 2-Position (Normally Closed) 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 Closed) Solenoid Valve

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

Structure Diagram:DFD Threaded 2-Way 2-Position (Normally Closed) 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

Flow Curve Chart

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

Specification Sheet

Min. 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)
0.3121280NBRH161444DFD-15-AC220V
0.31212130EPDMH1614——DFD-15-E-AC220V
0.31212120VITONH1614——DFD-15-V-AC220V
0.3121280NBRH161444DFD-20-AC220V
0.31212130EPDMH1614——DFD-20-E-AC220V
0.31212120VITONH1614——DFD-20-V-AC220V
0.3121280NBRH161444DFD-25-AC220V
0.31212130EPDMH1614——DFD-25-E-AC220V
0.31212120VITONH1614——DFD-25-V-AC220V
0.3121280NBRH161444DFD-32-AC220V
0.31212130EPDMH1614——DFD-32-E-AC220V
0.31212120VITONH1614——DFD-32-V-AC220V
0.3121280NBRH161444DFD-40-AC220V
0.31212130EPDMH1614——DFD-40-E-AC220V
0.31212120VITONH1614——DFD-40-V-AC220V
0.3121280NBRH161444DFD-50-AC220V
0.31212130EPDMH1614——DFD-50-E-AC220V
0.31212120VITONH1614——DFD-50-V-AC220V
0.3121280NBRH161444DFD-80-AC220V
0.31212130EPDMH1614——DFD-80-E-AC220V
0.31212120VITONH1614——DFD-80-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.

4. 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 Closed) Solenoid Valvestandard size

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

Outline Dimension Table   (Unit:mm)

Product ModelABCDWeight (Kg) - CopperWeight (Kg) - Stainless Steel
DFD-158045105910.70.65
DFD-208752115980.90.8
DFD-25107671251041.31.2
DFD-32130841331081.91.7
DFD-40145951511222.52.3
DFD-501771281661314.34
DFD-8025019521516511.5—


Due to the rapid R&D iteration speed of valve products from China kaiweixi Valve Group Co., Ltd., the above technical parameters and specification documents, including product overview, features, parts materials, outline dimension charts, CAD drawings, and product instruction manuals, are for your reference only. For actual applications, please contact our valve sales engineers to obtain the support you need for free. Thank you!