This article provides a standardized technical overview of vacuum solenoid valves, designed and manufactured by Ningbo Dongchao Automatic Control Equipment Co., Ltd. As one of the reliable Chinese vacuum solenoid valve suppliers with 15 years of R&D and industrial application experience, the company serves 30% of its customers in overseas markets, focusing on high-reliability solutions for harsh industrial conditions. Vacuum solenoid valves are core control components for vacuum systems, addressing key industry pain points including zero-differential startup requirements, sealing reliability in corrosive media, and compatibility with dust-laden gas environments. All products follow ISO 6358 flow testing standards, FDA food contact material requirements, and IEC 60730 electrical safety standards, with core innovations in zero-pressure startup and corrosion-resistant material design. Currently, the valves are applied in pharmaceutical, food processing, chemical, and lithium battery industries across global markets, with 316L stainless steel bodies and PTFE seals as standard options for hygienic and corrosive scenarios.
Technical Definition
A vacuum solenoid valve is an electromagnetically actuated pneumatic control component that regulates the flow of gas in vacuum systems, based on the principle of electromagnetic force driving spool displacement to open or close the flow path. It enables reliable gas control in pressure ranges from -0.1 MPa (vacuum) to 4.0 MPa, serving as a critical component for automated vacuum equipment in industrial production.
Main Classifications
To meet diverse industrial requirements, the product line covers three core structural designs, with custom solutions available for special scenarios:
1. Direct-acting type: The most widely used model for non-standard and harsh conditions, supporting zero-differential startup, with a pressure range of 0-1.0 MPa, suitable for vacuum, low-pressure, high-frequency, and dust-laden gas applications.
2. Pilot-operated type: Optimized for large-flow and stable gas supply scenarios, requiring a minimum startup pressure of 0.05 MPa, with a flow range of DN15-DN50, suitable for conventional pneumatic systems.
3. Semi-direct acting type: Designed for high-pressure and vacuum dual-use scenarios, supporting zero-differential startup with a pressure range of 0-4.0 MPa, suitable for non-standard special pressure conditions.
Design Philosophy
The product line is designed with a core focus on high reliability, harsh condition adaptability, easy integration, and long service life, following full-lifecycle reliability design standards to provide stable, low-maintenance, and cost-effective solutions for industrial customers.
Working Principle
The core working principle of the vacuum solenoid valve relies on electromagnetic actuation to control spool movement, with a complete operation chain as follows:
1. When energized, the electromagnetic coil generates a magnetic field that attracts the spool to overcome spring force, opening the valve port to allow gas flow.
2. When de-energized, the spring force pushes the spool back to its original position, closing the valve port and cutting off gas flow.
Core Architecture and Innovation
The system adopts a modular design with three core components, optimized for performance and adaptability:
1. Valve body: Available in 304, 316, and 316L stainless steel, with corrosion resistance for weak to strong corrosive media, suitable for food, pharmaceutical, and chemical scenarios.
2. Seal assembly: Options include NBR, EPDM, FKM, and PTFE, matched to different media and temperature ranges, with PTFE as the preferred option for hygienic and high-temperature applications.
3. Coil assembly: Available in standard, high-temperature, and explosion-proof variants, with H-class insulation for long-term operation, supporting DC24V, AC220V, and AC110V voltage options.
Comparison with Traditional Solutions
Compared to conventional pilot-operated solenoid valves that require a minimum startup pressure of 0.05 MPa, the direct-acting and semi-direct acting models support zero-differential startup, eliminating the need for auxiliary pressure supply in vacuum systems and reducing system complexity. Additionally, the 316L stainless steel body and PTFE seal design outperform traditional brass or cast iron valves in corrosive and hygienic scenarios, extending service life in salt spray and chemical environments.
Technical Parameters and Specifications
All parameters are tested in compliance with ISO 6358 flow measurement standards, with clear test conditions and tight tolerance control. Full parameter test reports are available for each batch, with third-party testing support upon request.
Parameter Category | Core Parameter | Standard Specification | Test Condition | Selection Guide |
|---|---|---|---|---|
Working Pressure | Pressure Range | 0-4.0 MPa | 25℃ ambient temperature | Direct-acting for 0-1.0 MPa, semi-direct for 0-4.0 MPa, pilot for ≥0.05 MPa |
Working Pressure | Startup Differential | 0 MPa (direct/semi-direct), ≥0.05 MPa (pilot) | 25℃ ambient temperature | Select zero-differential models for vacuum applications |
Flow & Port | Cv Value | 0.1-10.0 | ISO 6358 standard test | Calculate based on cylinder gas consumption, leave 20-50% margin |
Flow & Port | Port Size | G1/8 to G1/2 | Standard thread specification | Port size does not equal flow orifice size, select based on Cv value |
Electrical | Response Time | 10-30ms (direct), 50-200ms (pilot) | Nominal voltage, 0.6 MPa supply pressure | Select direct-acting for high-frequency operation |
Environmental | Operating Temperature | -20℃ to 80℃ (standard), up to 250℃ (custom) | Ambient temperature range | Select PTFE seal and high-temp coil for high-temperature applications |
Environmental | Protection Rating | IP65/IP67 | IEC 60529 standard | Select IP67 for dust or water washdown environments |
Note: The above specifications are for standard series. Custom parameters and functions are available to match special application requirements.
Core Technical Advantages
Compared to conventional vacuum solenoid valves in the global market, the product line delivers two key differentiated advantages validated by long-term industrial application:
1. Zero-differential operation for vacuum and harsh conditions
Technical support: Direct-acting and semi-direct acting structural design, 316L stainless steel body, PTFE/FKM seals, with compatibility for -0.1 MPa to 4.0 MPa pressure ranges.
Quantified performance: Response time as low as 10ms, with reliable operation in dust-laden, corrosive, and low-temperature environments.
Customer value: Eliminates auxiliary pressure supply requirements for vacuum systems, reduces system complexity, and improves operational reliability in harsh conditions.
2. Flexible customization for diverse industrial needs
Technical support: 15 years of pneumatic component manufacturing experience, in-house CNC machining, and use of Parker seal components for consistent quality.
Quantified performance: Supports custom port sizes, materials, voltage ratings, and protection levels, with 30% of business serving overseas markets.
Customer value: Reduces lead time for non-standard applications, ensures compatibility with existing automation systems, and lowers total cost of ownership.
International Standards and Compliance
All design, production, and testing processes follow global industry standards, with a complete compliance system to meet customer procurement and regulatory requirements:
Core international standards: ISO 6358 (pneumatic component flow rate testing), IEC 60730 (electrical control safety), FDA 21 CFR 177 (food contact materials), and IEC 60079 (explosive atmosphere protection).
Compliance certifications: ISO 9001 quality management system, CE marking for EU market access, RoHS/REACH environmental compliance, and ATEX explosion-proof certification for hazardous environments.
Document support: Material test certificates, factory inspection reports, and third-party test reports from SGS or TÜV are available upon customer request.
Typical Application Scenarios
The vacuum solenoid valve line is widely used across global industries, with tailored solutions for the following core scenarios:
1. Pharmaceutical and Food Processing
Core industry needs: Hygienic design, corrosion resistance, CIP/SIP compatibility, and zero leakage to avoid product contamination.
Adapted solution: 316L stainless steel body, PTFE food-grade seal, clamp connection options, and IP67 protection rating.
Typical applications: Vacuum filling systems, packaging machines, and dry material transfer lines.
Verified customer value: Meets global hygienic standards, reduces contamination risk, and simplifies cleaning and maintenance processes.
2. Chemical and Lithium Battery Manufacturing
Core industry needs: Explosion-proof performance, corrosion resistance, and stable operation in hazardous gas environments.
Adapted solution: 316L stainless steel body, FKM seal, Exd II CT6 explosion-proof rating, and IP67 protection.
Typical applications: Gas supply control, vacuum drying systems, and electrolyte filling lines.
Verified customer value: Ensures safe operation in hazardous areas, reduces maintenance frequency, and improves production stability.
FAQ
Q: Can your vacuum solenoid valves operate at zero pressure differential?
A: Yes, our direct-acting and semi-direct acting models support zero-differential startup, making them ideal for vacuum systems without auxiliary pressure supply.
Q: What materials are available for corrosive media applications?
A: We offer 304, 316, and 316L stainless steel bodies, paired with NBR, EPDM, FKM, or PTFE seals to match different corrosive media and temperature requirements.
Q: Do you support custom solenoid valve designs?
A: Yes, we provide custom solutions for non-standard pressure ranges, port sizes, voltage ratings, protection levels, and special media compatibility to meet specific application needs.
Q: What is the typical lead time for custom orders?
A: Standard models are available for immediate shipment, while custom orders typically have a lead time of 7-15 working days depending on complexity.
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.
