GD20(3/4")-N-3-AC220V / 2/2 way NC, NBR Seal

Details of GD20(3/4")-N-3-AC220V / Diaphragm 2/2 way NC, NBR Seal

The Diaphragm Solenoid Valve (Solenoid Valve Diaphragm Type) is a valve that controls the flow of liquids or gases using a diaphragm and solenoid to open and close the valve. It is commonly used in automatic systems such as water supply systems, irrigation systems, compressed air systems, and various industries.

Working Principle of Diaphragm Solenoid Valve

Main Components

• Solenoid Coil (Electromagnetic Wire Winding): Creates a magnetic field when electric current flows through it
• Plunger (Movable Iron Rod): Lifted or lowered by the magnetic field
• Diaphragm (Flexible Rubber/Silicone Sheet): Opens and closes fluid pathways
• Pilot Port (Pressure Control Port): A small port that helps control pressure on both sides of the diaphragm

Operation Mode

Normal Closed (NC) – Normally Closed

• No electricity → Plunger closes pilot port → Pressure on both sides of the diaphragm is equal → Diaphragm keeps valve closed
• Electricity applied → Plunger is lifted → Pilot port opens → Pressure above the diaphragm decreases → Fluid from below pushes up the diaphragm → Valve opens

Normal Open (NO) – Normally Open

• Similar principle but reversed pressure side → No electricity, valve is open; with electricity applied, valve closes

Advantages of Diaphragm Valve

• Rapid opening and closing
• No leakage (as the diaphragm does not wear out like other valves)
• Easy maintenance
• Suitable for clean liquids such as water, air

Usage Details

• Potable Water System – Controls water in filtration machines and cold water makers
• Irrigation System – Opens and closes water according to schedule
• Food/Pharmaceutical Industry – Used with clean liquids that require precise control
• Pneumatic Systems (Compressed Air) – Controls air supply in machinery
• Home Appliances – Such as washing machines, coffee makers

Tech Specifications GD20(3/4")-N-3-AC220V / Diaphragm 2/2 way NC, NBR Seal