ZQDF Series Steam Solenoid Valve – High-Temperature Piston Type (Normally Closed), 180°C

The ZQDF Series is a heavy-duty, two-position two-way solenoid valve specifically engineered for thermal energy systems and high-temperature fluid control. Utilizing a step-by-step direct-acting piston structure, this valve excels where standard diaphragm valves fail. The “Zero Differential” design ensures the valve opens and closes reliably even at 0.0 MPa (0 PSI), making it the industry standard for steam lines, boiler systems, and gravity-fed hot water applications.

Built with a robust forged brass or optional SS304 body and a high-grade Class H (180°C) insulated coil, the ZQDF series provides superior thermal resistance and long-cycle life in demanding industrial environments.

Technical Data

• Connection Size: G (NPT) 3/8″, 1/2″, 3/4″, 1″, 1-1/4″, 1-1/2″, 2″ (DN10 to DN50)

• Operation Model: Step-by-Step Direct-Acting (Piston Type)

• Initial State: Normally Closed (NC)

• Body Material: Forged Brass / Stainless Steel 304

• Working Pressure: 0 – 8 bar / 0 – 116 PSI (0.0MPa – 0.8MPa)

• Voltage Options: AC 220V, 110V, 24V (50/60Hz) / DC 24V, 12V

• Power Consumption: AC: 50VA / DC: 30W-42W (depending on size)

• Sealing Material: PTFE (Standard for high temperature)

• Insulation Class: Class H (Up to 180°C)

• Protection Level: IP54 (Standard) / IP65 (Optional)

• Certification: CE

“Custom specifications including explosion-proof coils (Ex mb IIC T4 Gb), flanged connections, and specific voltage requirements are available upon request.”

If your system requires higher safety margins or faces pressure spikes up to 1.5 MPa, our 2L(US) Series offers double the durability of standard ZQDF valves.