Low Temperature Cryogenic Solenoid Valve for Liquid Nitrogen CO2
The ZALD cryogenic solenoid valve is designed for automated control of ultra-low temperature gases and liquids such as liquid nitrogen, liquid oxygen, liquid ammonia, CO₂, and refrigerants. Made of corrosion-resistant stainless steel and engineered for cryogenic durability down to -196°C, it ensures reliable performance with minimal wear. Its compact design combines direct-acting and pilot-operated advantages, enabling stable operation even under low or zero differential pressure. Widely used in industries such as aerospace, nuclear, marine, petrochemical, power, and food processing.
- Model: ZALD
- Nominal Diameter: DN3 ~ DN50
- Nominal Pressure: 1.0 MPa ~ 4.0 MPa
- Operating Temperature: -101°C ~ -196°C
- Valve Body Material: Stainless Steel 304, 316, 316L
- Applicable Media: Freon, Liquid Ammonia, Liquid Oxygen, Liquid Nitrogen, Liquid COâ‚‚, Refrigerants
- Structure Type: Pilot-operated, Direct-acting, Zero-pressure start
- Connection Type: Flange, Threaded, Welded
- Drive Mode: Electromagnetic
- Manufacturing Standards: GB (China), DIN (Germany), API & ANSI (USA)
Fluid Media: Liquid Nitrogen, CO2
| 1 | Valve Body |
|---|---|
| 2 | Seal Gasket |
| 3 | Piston |
| 4 | Upper Valve Cover |
| 5 | Thermostatic Rod |
| 6 | Isolation Flange |
| 7 | Moving Iron Core |
| 8 | Return Spring |
| 9 | Coil Assembly |
| 10 | Fixing Nut |
| Model | Orifice (mm) |
Material | CV | Consumption (W) |
Dimensions | Port Size | |
|---|---|---|---|---|---|---|---|
| Width(mm) | Height(mm) | ||||||
| ZALD-4B | 3 | SS | 0.2 | 19 | 50 | 80 | 1/8″ |
| ZALD-6B | 6 | SS | 0.75 | 19 | 50 | 210 | 1/4″ |
| ZALD-8B | 8 | SS | 1 | 19 | 50 | 210 | 1/4″ |
| ZALD-10B | 10 | SS | 2.1 | 70 | 70 | 240 | 3/8″ |
| ZALD-15B | 15 | SS | 5 | 70 | 70 | 260 | 1/2″ |
| ZALD-20B | 20 | SS | 11 | 70 | 73 | 260 | 3/4″ |
| ZALD-25B | 25 | SS | 13 | 70 | 100 | 280 | 1″ |
| ZALD-32B | 32 | SS | 28 | 70 | 112 | 310 | 1-1/4″ |
| ZALD-40B | 40 | SS | 30 | 70 | 123 | 330 | 1-1/2″ |
| ZALD-50B | 50 | SS | 46 | 70 | 168 | 360 | 2″ |
Working Principle
-
Normally Closed (NC):
When the coil is energized, the solenoid core is attracted, the pressure relief port opens, and the main piston is driven by the medium pressure to open the main valve port, allowing the medium to flow through.
When the coil is de-energized, the main valve port closes, and the medium flow is cut off. -
Normally Open (NO):
When the coil is energized, the solenoid core is attracted, the pressure relief port closes, and the main piston is driven by the medium pressure to close the main valve port, cutting off the medium flow.
When the coil is de-energized, the main valve port opens, and the medium flows through.
