This article provides a standardized technical interpretation of two-way solenoid valves, a core pneumatic control component developed and manufactured by Ningbo Dongchao Automatic Control Equipment Co., Ltd. Established in 2011, the company has 15 years of R&D and industrial application experience in pneumatic control components, serving domestic and overseas markets with 30% of revenue from international regions. Two-way solenoid valves are designed to address core industry pain points including unreliable zero-pressure startup, poor corrosion resistance in harsh media environments, and lack of customizable solutions for special working conditions. The product line strictly adheres to ISO 9001 quality management standards, FDA food contact material requirements, and ATEX explosion-proof specifications, with core innovations in direct-acting and step-by-step direct-acting structures that enable zero-pressure startup and high-pressure resistance up to 4.0 MPa. Currently, the valves are widely applied in pharmaceutical, food and beverage, chemical, lithium battery, and automation equipment industries, with verified performance in vacuum, high-temperature, and dust-laden environments.
Technical Definition
A two-way solenoid valve is an electromechanically controlled fluid control component that uses electromagnetic force to switch the on/off state of fluid flow, based on direct-acting, pilot-operated, or step-by-step direct-acting working principles. It can realize precise flow control for gases, liquids, and corrosive media, and is an indispensable core component in pneumatic automation systems, industrial equipment, and process control lines.
Main classifications of two-way solenoid valves include:
1. Direct-acting type: Most widely used for non-standard and harsh conditions, supports zero-pressure startup, pressure range 0 to 1.0 MPa, suitable for small to medium flow rates (DN1 to DN15), vacuum, low-pressure, frequent action, and dust-laden scenarios.
2. Pilot-operated type: Designed for standard high-flow applications, requires minimum 0.05 MPa startup pressure, flow range DN15 to DN50, suitable for conventional pneumatic systems and stable gas source scenarios.
3. Step-by-step direct-acting type: Optimized for high-pressure and zero-pressure dual-use scenarios, pressure range 0 to 4.0 MPa, suitable for high-pressure, vacuum plus high-pressure combined, and non-standard special pressure applications.
Our two-way solenoid valves are designed with core principles of high reliability, easy integration, long service life, and adaptability to harsh industrial conditions, with full lifecycle reliability design to provide stable, low-maintenance, and cost-effective solutions for global clients.
Technical Principle
The operation of two-way solenoid valves is based on electromagnetic force drive and fluid pressure differential coordination. The complete working logic chain is as follows:
1. Input: When the coil is energized, it generates electromagnetic force to drive the core assembly, opening or closing the valve port.
2. Processing: For direct-acting valves, the electromagnetic force directly acts on the valve core to seal or open the port; for pilot-operated valves, the electromagnetic force first opens the pilot hole, creating a pressure differential on both sides of the main valve core to drive the main valve opening.
3. Output: The fluid flow is switched on or off according to the valve port state, realizing the required control function.
Core modular design includes an optimized electromagnetic coil module with H-class insulation for long-term energization, optional explosion-proof designs (Exd II CT6 / Exia) for hazardous environments, and a valve body and sealing module available in 304, 316, and 316L stainless steel with NBR, EPDM, FKM, or PTFE seals to adapt to different media and temperature requirements.
Compared with traditional pilot-operated valves that require a minimum 0.05 MPa pressure differential, our direct-acting and step-by-step direct-acting valves support zero-pressure startup, solving unreliable startup issues in vacuum and low-pressure scenarios. Compared with traditional brass-body valves with NBR seals that fail in corrosive environments, our 316L stainless steel body with PTFE seals can withstand strong acids, alkalis, and temperatures up to 250°C for pharmaceutical and food-grade applications.
Technical Parameters & Specifications
All parameters of our two-way solenoid valves are tested in strict accordance with ISO international standards, with clear test conditions and tight tolerance control. We provide full parameter test reports for each batch and support third-party authoritative testing.
Parameter Category | Core Parameter | Standard Specification | Test Condition | Selection Reference & Technical Description |
|---|---|---|---|---|
Core Performance | Working Pressure Range | 0 to 4.0 MPa | 25°C room temperature, standard medium | Covers vacuum, low-pressure, and high-pressure scenarios, customizable for special pressure requirements |
Core Performance | Startup Pressure Differential | 0 MPa (zero pressure) or ≥0.05 MPa | 25°C room temperature | Zero-pressure startup models are suitable for vacuum and low-pressure applications |
Core Performance | Response Time | 10 to 200 ms | 25°C room temperature, rated voltage | Direct-acting models have faster response (10-30ms) for frequent action scenarios |
Electrical Characteristics | Rated Voltage | DC24V (priority), AC220V, AC110V | 25°C room temperature | DC24V is recommended for most industrial automation systems |
Environmental Adaptability | Working Temperature | -20°C to 80°C (standard), up to 250°C (high-temperature type) | Continuous operation test | High-temperature models are suitable for steam and high-temperature process applications |
Environmental Adaptability | Protection Rating | IP65 / IP67 | Dust and water spray test | Suitable for dust-laden and washdown environments |
Mechanical Characteristics | Nominal Diameter | DN1 to DN50 | Standard flow test | Select based on required flow rate, with 20-50% margin reserved |
The above parameters are standard specifications for conventional series. We can provide parameter customization and function adjustment according to special working conditions and application requirements.
Technical Advantages
Compared with conventional two-way solenoid valves in the global market, our products have formed core competitive advantages through independent R&D and technological innovation, verified by long-term industrial applications of global clients:
1. Harsh working condition adaptability: We offer 316L stainless steel valve bodies with PTFE or FKM seals, and optional explosion-proof designs (Exd II CT6 / Exia) for hazardous environments. The valves can withstand strong acids, alkalis, salt spray, and temperatures up to 250°C, reducing maintenance frequency and unplanned downtime for clients.
2. Flexible customization capability: We provide non-standard customization for pressure, flow, material, and interface requirements, with a dedicated R&D team to develop tailored solutions for special scenarios, solving the problem of standard products failing to match special working conditions.
International Standards & Compliance
All R&D, design, production, and testing processes of our two-way solenoid valves strictly follow the latest international standards and industry specifications, with a complete compliance and certification system to meet the stringent procurement and regulatory access requirements of clients in different regions. We adhere to ISO 9001 quality management system standards, FDA food contact material standards for 316L stainless steel and PTFE seal models, and ATEX explosion-proof standards for hazardous environment models. We can provide EN 10204 3.1 material test certificates, factory inspection reports, and conformity declarations according to client requirements.
Selection Guide & Application Scenarios
Selecting the appropriate two-way solenoid valve model is critical to ensuring application performance, stability, and service life. Based on 15 years of industry experience, we provide a step-by-step selection guide: first confirm core functional requirements, medium characteristics, working environment conditions, and compliance requirements; then select the appropriate series based on pressure, flow, and medium requirements; conduct sample testing for complex scenarios; confirm required compliance documents; and finalize customization requirements if standard products do not match needs.
Typical application scenarios include:
1. Pharmaceutical and Food & Beverage Industries: Use 316L stainless steel body with PTFE seals and sanitary clamp interfaces for sterile filling lines, pharmaceutical liquid control, and CIP/SIP cleaning processes, meeting high hygiene standards and reducing contamination risks.
2. Chemical and Lithium Battery Industries: Use explosion-proof designs (Exd II CT6 / Exia) with 316 stainless steel body and FKM seals for chemical medium transportation, lithium battery electrolyte filling, and hazardous gas control, ensuring safe operation in hazardous environments.
3. Industrial Automation Equipment: Use direct-acting valves with fast response time (10-30ms) and DC24V rated voltage for pneumatic cylinder control, automated production lines, and packaging machinery, improving automation system response speed and production efficiency.
FAQ
Q: What is the difference between direct-acting and pilot-operated two-way solenoid valves?
A: Direct-acting valves support zero-pressure startup with faster response (10-30ms) and are suitable for harsh conditions, while pilot-operated valves require a minimum 0.05 MPa pressure differential, offer larger flow rates, and are more energy-efficient for stable high-flow scenarios.
Q: Can your two-way solenoid valves be used for food and pharmaceutical applications?
A: Yes, we offer 316L stainless steel body valves with PTFE seals that meet FDA food contact standards, suitable for sterile and CIP/SIP cleaning processes in food and pharmaceutical industries.
Q: Do you provide non-standard customization for special working conditions?
A: Yes, we provide customization for pressure range, flow rate, material, interface, and electrical requirements, with a dedicated R&D team to develop tailored solutions for special scenarios.
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
