Industrial Gas Burners & Solenoid Valves for Manufacturing Plants [Stiefel]

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Normally open solenoid valve from Stiefel - Simple Flow Solutions for Low Pressure Systems

Aimed for uninterrupted flow in burners, kilns and boilers, Stiefel’s Normally Open (NO) solenoid valves remain open when de-energized. Offer low pressure drop (≤0.3 bar) and high flow capacity (Cv=20).
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Advantages of Stiefel’s Solenoid Valves

Reliable Fluid Control Using Precision Engineering

Stiefel's solenoid valves are of the utmost accuracy, including a leakage rate of ≤0.001 cc/min and a lifespan of over 10 million cycles. Our valves are made of 316 stainless steel and PTFE with a salt water (up to 100 bar) high pressure and extreme temperature durability (-40°C to 300°C). This makes them useful for industrial fuel systems, steam lines, and chemical processing. For instance, a German pharmaceutical plant's sterilization system over 5 years used our double-block valves without any leakage. Our valves use dual-seal design which incorporates a secondary safety mechanism. The tungsten carbide seats maintain tight seals even in high viscosity fuel applications, like waste oil burners, due to their resistance to coking and abrasion.

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Stiefel, a trusted supplier of combustion equipment since 2013 with headquarters in Guangzhou, China, offers high-quality normally open solenoid valves, specialized flow control components that remain open to allow media flow when de-energized and close when energized, providing a fail-safe mechanism for applications where uninterrupted flow is critical unless a shutdown is required. A normally open solenoid valve is designed with a spring-loaded mechanism that keeps the valve open without power, ensuring media (such as air, water, or gas) flows freely under normal conditions, and only closes when an electrical signal activates the solenoid coil, making it ideal for safety systems, ventilation, and backup fluid supply lines. Stiefel's normally open solenoid valve is engineered with durable materials, including brass or stainless steel bodies, high-temperature seals, and robust solenoid coils, ensuring resistance to corrosion, pressure (up to 300 psi), and temperatures (up to 180°C), which is vital for reliable operation in industrial, commercial, and residential settings. The normally open solenoid valve features fast response times (typically 30-100 milliseconds) to energization, ensuring quick closure when needed, while its spring design guarantees consistent opening force when de-energized, maintaining stable flow rates and preventing pressure drops in critical systems. What sets this normally open solenoid valve apart is its versatility, compatible with various media types, including clean fluids, gases, and light oils, making it suitable for applications such as burner air supply control, irrigation systems, and industrial process lines where fail-open functionality is required. Normally open solenoid valves from Stiefel are available in multiple sizes (from 1/4 inch to 2 inches) and connection types (NPT, BSP), offering flexibility for integration into new or existing systems, with options for manual override to ensure operability during power outages or maintenance. Rigorously tested for leak tightness in both open and closed positions, durability, and coil performance, these normally open solenoid valves meet international standards such as ISO and CE, ensuring compliance with safety regulations and reliable operation. Backed by Stiefel's research and development expertise, the normally open solenoid valve incorporates innovations such as low-power coils and enhanced spring designs, improving energy efficiency and extending service life, which aligns with the company's commitment to energy-saving solutions. With Stiefel's comprehensive service network, customers receive expert support for selecting, installing, and maintaining normally open solenoid valves, including guidance on voltage requirements and media compatibility to ensure optimal performance. For systems requiring fail-safe flow control with reliable operation, Stiefel's normally open solenoid valve is an essential component that delivers safety, flexibility, and durability.

Frequently Asked Questions

What are the maximum pressures, temperatures and ranges Stiefel valves support?

For our standard valves, we cope within the range of bar from 0.1 up to 100, and -40°C to 300°C in temperature. The high-pressure versions up to 300 bar with Inconel bodies are used in oilfield fracturing systems, while cryogenic (-196°C) variants serve liquid gas storage. Our valves with low thermal conductivity and leak proof performance are crucial for a swiss medical facilities liquid oxygen lines.

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Customer Feedback

Thomas B.
Steam Systems Require Reliable Valves

For three years now, Stiefel’s solenoid valves have been a critical component of our hospital’s steam sterilization cycle. Their 316SS bodies stand up to the aggressive cleaning damage associated with hospital grade sterilization while the steam flow control ensured by the fast actuation <80ms is unparalleled. Thanks to the easy-to-replace modular components and robust screw design, we have seen a reduction in maintenance calls by 70%.

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Advanced Material Sciences

Advanced Material Sciences

Stiefel’s commitment to material innovation is evident in components such as silicon carbide (1,400°C resistant) coils and ultra low friction DLC diamond-like carbon coatings. These materials provide 50% reduced wear in high-cycle applications for paint booth valves in German automotive plants which have performed for over 5million cycles.
Predictive Maintenance With IoT

Predictive Maintenance With IoT

Additional to our smart valves, sensors measure and monitor performance metrics such as temperature of coil, speed and leakage rate of actuation. A Dutch dairy plant used this information to accurately forecast seal replacements resulting in a 35% decrease in unplanned downtime and 20% optimization of maintenance expenditure.
Certification and Compliance on A Global Scale

Certification and Compliance on A Global Scale

Our valves soar many industry standards with CE, ATEX, UL, CSA and FDA certicates. Exemplified by our medical-grade valves in US hospitals oxygen systems and industrial valves complying with machine directive EU 2006/42/EC in manufacturing facilities worldwide.