Explosion-Proof Solenoid Valves
The explosion‑proof solenoid valve encloses all components that may ignite flammable gas mixtures inside an enclosure. The enclosure can withstand internal explosion of flammable mixtures infiltrated through joints or structural gaps without being damaged. The flame‑proof enclosure isolates the internal space of equipment from the surrounding environment. Due to breathing effect and gas permeation of electrical equipment, flammable gas mixtures may exist inside through gaps of flame‑proof enclosure.
Structural Features
‑ Fast action response; large discharge capacity
‑ Valve body adopts hot forging forming process with nice appearance
‑ Original sealing material adopted, service life ten times longer than similar products
‑ CNC machining ensures high precision and reliability of solenoid valve
‑ Special‑made coil with heat dissipation structure, not easy to burn out
‑ Sensitive action even after long‑time idle state restart
Working Principle
Normally Closed (NC)
When the coil is energized, the pilot valve core is attracted, the pilot hole opens, and the upper chamber of the valve releases pressure. The piston is pushed by the medium pressure in the lower chamber, opening the solenoid valve. When the coil is de‑energized, the pilot valve core resets via the spring, the pilot hole closes, and the upper chamber of the valve is pressurized through the piston orifice. With the thrust of the return spring, the solenoid valve closes.
Normally Open (NO)
When the coil is energized, the pilot hole closes, the upper chamber of the valve is pressurized through the piston orifice, and with the thrust of the return spring, the solenoid valve closes. When the coil is de‑energized, the pilot valve core resets via the spring, the pilot hole opens, the upper chamber of the valve releases pressure, and the piston is pushed by the medium pressure in the lower chamber, opening the solenoid valve.
Product Parameters
| Product Specification | DN0.5~DN1000 |
| Applicable Media | Flammable and explosive liquid or gas |
| Control Mode | Normally closed, Normally open, Self‑holding |
| Valve Body Material | Cast iron, Cast steel, Stainless steel |
| Power Supply Voltage | DC12~127V, AC36~380V |
| Medium Temperature | -200~+200℃ |
| Connection Type | Internal thread, Flange (External thread and special ports can be customized or fitted with adapter) |
| Medium Viscosity | Less than 50Cst (Customized for higher viscosity) |
| Protection Performance | Waterproof, Explosion‑proof, Anti‑corrosion |
| Wiring Mode | Terminal block type; Lead wire type |
| Leakage | Zero |
Application Fields
The explosion‑proof solenoid valve is suitable for corrosive gas or liquid, especially for pipeline control systems of air, water, hot water, coal gas, natural gas, diesel oil, etc. It is widely used in mining equipment, cutting equipment, washing equipment, machinery manufacturing, energy & biology, medical treatment, environmental water treatment and other industries.
