This article provides a standardized technical interpretation of explosion-proof solenoid valves, developed and manufactured by Ningbo Dongchao Automatic Control Equipment Co., Ltd. As a professional supplier of pneumatic control components with 15 years of industrial R&D and application experience since its founding in 2011, the company serves global clients across automation, rail transit, environmental protection and engineering machinery sectors.
Explosion-proof solenoid valves are designed for hazardous industrial environments, solving core pain points including ignition risks in flammable gas atmospheres, material corrosion in high-humidity coastal areas, and inconsistent flow control under variable pressure conditions. All products are built to align with IEC 60079 explosion protection standards, FDA food contact material requirements and ISO 9001 quality management norms. The product line currently supports 30% of the company’s overseas business, serving industrial clients across Southeast Asia, Europe and North America, with verified performance in chemical processing, lithium battery manufacturing, food and pharmaceutical production, and dust collection systems.
Technical Definition
An explosion-proof solenoid valve is an electromechanically controlled fluid regulation component designed to prevent internal spark or arc ignition of surrounding explosive gas or dust mixtures, built on pressure-resistant enclosure and arc isolation principles. It delivers reliable on-off or flow control for hazardous industrial environments, and has become a critical supporting component for safe operation in explosive atmosphere scenarios.
Three mainstream series are available to match diverse working conditions, with customization support for special application requirements:
1. Direct-acting explosion-proof valve: zero pressure differential start capability, suitable for vacuum, low pressure and frequent action scenarios, with response time of 10-30ms.
2. Pilot-operated explosion-proof valve: large flow capacity, low power consumption, suitable for stable compressed air systems with minimum 0.05 MPa inlet pressure.
3. Step-by-step direct-acting explosion-proof valve: supports 0-4.0 MPa pressure range, suitable for high pressure and dual vacuum-high pressure application scenarios.
The product line is designed with core principles of high reliability, corrosion resistance, easy integration and long service life, built to withstand harsh industrial operating conditions across full lifecycle use.
Working Principle
The core operation of the valve relies on two key design mechanisms: a pressure-resistant enclosure that contains internal sparks or arcs without transmitting heat or flame externally, and an isolated coil design that eliminates exposed conductive parts. The full operation chain follows a clear, repeatable logic:
1. When rated electrical current is applied to the coil, the generated magnetic field drives the valve core to shift, opening or closing the fluid flow path.
2. The precision-machined flame path gaps cool any escaping hot gas below the ignition temperature of surrounding explosive mixtures, eliminating external ignition risks.
Compared with general-purpose solenoid valves, this design eliminates ignition risks in explosive atmospheres, while the direct-acting and step-by-step direct-acting models remove the minimum inlet pressure requirement that limits traditional pilot-type explosion-proof valve applications.
Technical Parameters and Specifications
All product parameters are tested per international industry standards, with clear tolerance control. Full test reports are provided for each batch, with support for third-party verification.
Parameter Category | Core Parameter | Standard Indicator | Test Condition | Selection Reference |
|---|---|---|---|---|
Core Performance | Pressure range | 0-4.0 MPa | 25°C ambient | Supports zero differential start for direct-acting models |
Core Performance | Flow coefficient Cv | 0.1-8.0 | 0.5 MPa inlet pressure | Covers DN1-DN50 port sizes |
Electrical Characteristics | Rated voltage | DC24V, AC220V, AC110V | ±10% voltage fluctuation | Supports continuous coil operation with Class H insulation |
Environmental Adaptability | Explosion proof rating | Exd II CT6 / Exia | IEC 60079 test protocol | Suitable for chemical, lithium battery and dust-laden environments |
Material Compatibility | Body material | 304/316/316L stainless steel | Salt spray corrosion test | Matched to media corrosiveness and hygiene requirements |
Note: All standard parameters can be customized to match specific customer working conditions.
Core Technical Advantages
Compared with conventional explosion-proof solenoid valves available in the global market, the product line delivers two verified, customer-focused performance advantages:
1. Corrosion-resistant 316L stainless steel construction with food-grade PTFE seals. The design passes 1000-hour salt spray resistance testing, with corrosion performance 3 times higher than standard brass body valves. This reduces customer maintenance frequency by 60%, and eliminates media contamination risks for food and pharmaceutical production lines.
2. Flexible zero-pressure start capability across wide pressure ranges. The product line supports operation from full vacuum (-0.1 MPa) to 4.0 MPa high pressure, with no minimum inlet pressure requirement for selected models. This expands application coverage to vacuum systems, low-pressure pneumatic lines and high-pressure process systems, reducing customer spare part inventory for multi-scenario operations.
Typical Application Scenarios
The product line is deployed across multiple industrial sectors, with tailored solutions for core customer needs:
1. Chemical and lithium battery manufacturing: The Exd II CT6 rated valves with 316L body are used for solvent delivery and pneumatic control in coating and electrolyte filling lines, eliminating ignition risks and ensuring safe continuous production.
2. Food and pharmaceutical production: 316L sanitary valves with PTFE seals are used for sterile media delivery and vacuum packaging lines, meeting hygienic design requirements for CIP/SIP cleaning processes.
3. Dust collection and environmental protection: IP67 rated direct-acting valves are used for pulse jet dust collector control, reducing maintenance downtime in high-dust operating conditions.
FAQ
Q: Can your explosion-proof solenoid valve operate with zero inlet pressure?
A: Yes, our direct-acting and step-by-step direct-acting models support zero differential start, with no minimum inlet pressure requirement for operation.
Q: What material options are available for corrosive media applications?
A: We offer 304, 316 and 316L stainless steel body options, paired with NBR, EPDM, FKM or PTFE seals matched to specific media chemical composition and temperature.
Q: Do you provide customized valve solutions for non-standard working conditions?
A: Yes, we support full customization of pressure range, port size, seal material, explosion proof rating and electrical specifications to match unique customer application requirements.
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
