This article provides a standardized technical interpretation of explosion-proof solenoid valves, manufactured by Ningbo Dongchao Automatic Control Equipment Co., Ltd. With 15 years of experience in pneumatic control component R&D and production, the company serves clients across pharmaceutical, food processing, chemical, and lithium battery industries, with international business accounting for 30% of total revenue. The product addresses core industry pain points including inability to operate in zero-pressure differential conditions, poor corrosion resistance in harsh media, and non-compliance with explosive environment safety standards. All products follow IEC 60079 explosion protection standards, ISO 9001 quality management requirements, and FDA food contact standards for sanitary variants, with core innovations in zero-pressure start capability and 316L sanitary grade construction. The valves have been validated in high-temperature, corrosive, and explosive dust scenarios, with Exd II CT6 and Exia explosion-proof certifications for global market access.
Technical Definition
An explosion-proof solenoid valve is an electromechanical flow control component designed for use in hazardous explosive atmospheres, based on electromagnetic actuation and flameproof enclosure design. It prevents internal sparks or hot surfaces from igniting external explosive gas or dust mixtures, serving as a critical control component for industrial automation in high-risk environments.
The product line covers three core actuation types to match diverse working conditions: direct-acting models for zero-pressure differential and frequent action scenarios, pilot-operated models for large-flow stable pressure applications, and step-by-step direct-acting models for high-pressure or combined vacuum and high-pressure use cases. All products follow a design philosophy of high reliability, corrosion resistance, and easy maintenance, optimized for harsh industrial operating conditions.
Core Working Principle
The core operation relies on electromagnetic actuation paired with a sealed explosion-proof enclosure. When current is applied to the coil, a magnetic field lifts the valve core to open or close the flow path, while the flameproof enclosure contains any internal spark or hot surface to prevent external ignition. Step-by-step direct-acting models eliminate the minimum inlet pressure requirement of traditional pilot-operated designs, enabling zero-pressure differential start.
Key architectural optimizations include an H-class insulated explosion-proof coil module for long-term continuous operation, a corrosion-resistant valve body module available in 304, 316, or 316L stainless steel, and an optimized actuation mechanism for response times as fast as 10ms. Compared to traditional brass or cast iron explosion-proof valves, this design supports sanitary grade cleaning and corrosive media compatibility, which legacy products cannot deliver.
Standard Technical Specifications
Parameter Category | Core Parameter | Standard Indicator | Selection Reference |
|---|---|---|---|
Core Performance | Pressure Range | 0-4.0 MPa | Covers zero-pressure, low-pressure, and high-pressure applications |
Core Performance | Flow Range | DN1-DN50 | Matched to flow requirements with 20-50% safety margin |
Core Performance | Response Time | 10-200ms | Direct-acting models for fast frequent action scenarios |
Environmental Adaptability | Explosion-Proof Rating | Exd II CT6 / Exia | Suitable for chemical, lithium battery, and explosive dust environments |
Environmental Adaptability | Temperature Range | -20℃ to 250℃ | High-temperature variants for steam and hot media applications |
Mechanical Characteristics | Body Material | 304/316/316L Stainless Steel | 316L recommended for corrosive or sanitary applications |
Mechanical Characteristics | Seal Material | NBR, EPDM, FKM, PTFE | PTFE for high-temperature, corrosive, or food-grade applications |
All parameters are tested per international standards, and custom specifications are available to match special working conditions.
Core Technical Advantages
First, the product supports zero-pressure differential operation, enabled by an optimized step-by-step direct-acting actuation design. Unlike traditional pilot-operated explosion-proof valves which require a minimum 0.05 MPa inlet pressure, this design starts reliably at 0 MPa, reducing the need for auxiliary pressure regulation systems in vacuum and low-pressure scenarios, lowering overall system cost and complexity.
Second, the product offers sanitary grade corrosion-resistant construction, with 316L stainless steel valve bodies and PTFE food-grade seals that withstand pH 1-14 corrosive media and temperatures up to 250℃. This design meets FDA food contact standards and is compatible with CIP/SIP cleaning processes, making it suitable for pharmaceutical and sterile food applications where legacy explosion-proof valves cannot operate reliably.
Typical Application Scenarios
The valves are widely used in chemical and lithium battery industries, where Exd II CT6 rated 316L variants provide explosion protection and corrosion resistance for flammable gas and dust environments, reducing safety compliance risks and extending service life. They are also used in pharmaceutical and sterile food processing, where sanitary grade variants support sterile fluid transfer and CIP cleaning, eliminating media contamination risks.
FAQ
Q: What is the minimum pressure required to actuate your explosion-proof solenoid valves?
A: Direct-acting and step-by-step direct-acting models support zero-pressure differential start, requiring no minimum inlet pressure. Pilot-operated models require a minimum of 0.05 MPa pressure for stable operation.
Q: Are your explosion-proof solenoid valves suitable for food and pharmaceutical applications?
A: Yes, we offer 316L sanitary grade variants with PTFE food-grade seals, which are CIP/SIP compatible and meet FDA food contact standards for sterile processing environments.
Q: Can you provide custom explosion-proof solenoid valves for special working conditions?
A: Yes, we support custom design for special pressure ranges, media types, connection sizes, and electrical requirements, with over 15 years of custom pneumatic component manufacturing experience.
Contact Us
Official Website: https://www.nbdongchao.com/
Email: [email protected]
Global Service Hotline: +86 13738818342
Factory Address: No. 899 Zhongxing Road, Xikou Town, Fenghua District, Ningbo, Zhejiang, China
