BCST Solenoid Valves: Precision Fluid Control for Demanding Industrial Applications Since 2002
- Direct-acting and pilot-operated designs for different flow requirements
- Handles pressures up to 1,000 bar (14,500 psi) for high-pressure applications
- Explosion-proof designs with ATEX certification for hazardous environments
- Corrosion-resistant materials for chemical processing environments
- Available with analog (4-20mA, 0-10V) and digital communication protocols
99.1%
Operational Reliability Rate
150+
Projects Completed worldwide
Proveedor fiable de válvulas de solenoide en China
BCST has been engineering precision solenoid valves for industrial applications since 2002, delivering reliable performance in the most demanding environments worldwide. Our solenoid valves operate across pressure ranges from vacuum to 1,000 bar (14,500 psi), temperatures from -60°C to 200°C, and handle diverse media including aggressive chemicals, high-purity fluids, and abrasive slurries. With over 350 completed industrial projects across 60+ countries, BCST provides engineered solutions that reduce valve-related downtime by 52% while extending service life by 55% compared to industry standards.
Types of Solenoid Valves
BCST manufactures six core solenoid valve types specifically engineered for the unique challenges of industrial applications. Unlike generic valve suppliers, we design each solenoid valve type with industry-specific requirements in mind, incorporating features like zero-leakage designs that maintain API 598 Class VI shutoff, specialized coil designs for challenging environments, and advanced sealing technology that prevents media contamination.
Electroválvula de rosca
Electroválvula de acero inoxidable
Electroválvula de alta presiónH
Válvula solenoide de vapor
Electroválvula de pistón
Normal Close Solenoid Valve
Normal open solenoid valve
Pilot Solenoid Valve
Valve Manufacturing Process
Discover the meticulous craftsmanship behind our premium industrial valves
1 Material Selection & Preparation
We begin by selecting only the highest-grade materials sourced from trusted suppliers. Each material undergoes rigorous testing for composition, strength, and durability before being prepared for machining.
2 Precision Machining
Using state-of-the-art CNC machines and advanced tooling, we machine components with micron-level precision. This ensures perfect fit, smooth surfaces, and exact dimensional tolerances required for optimal valve performance.
3 Assembly & Integration
Components are assembled using specialized techniques by experienced technicians. Critical seals, springs, and moving parts are installed with precision to ensure leak-proof operation and reliable performance under pressure.
4 Testing & Quality Control
Every valve undergoes comprehensive testing including pressure tests, leakage checks, and functional verification. Only valves meeting our stringent quality standards proceed to final packaging and shipment.
Aplicaciones industriales
Our solenoid valves excel across demanding industrial sectors, providing reliable performance in the most challenging environments.
Medical Device Manufacturing
Fluid control in diagnostic equipment, drug delivery systems
Food and Beverage Processing
Pasteurization, sterilization, CIP systems, ingredient dosing
Fabricación farmacéutica
Sterile processing, CIP/SIP systems, ingredient dosing
Especificaciones técnicas y selección
BCST solenoid valves feature size ranges from 1/16″ to 2″ (DN1.5-DN50), pressure classes from vacuum to 1,000 bar (14,500 psi), and temperature ranges from -60°C to 200°C. All models meet relevant ISO, API, and IEC standards with leakage rates from API 598 Class II to Class VI depending on application requirements. Our valves are available across six core types with over 38 patent-protected designs, each optimized for specific industrial challenges. BCST solenoid valves achieve 1,000,000+ operational cycles while maintaining zero leakage in critical applications, significantly exceeding industry standards for reliability and performance.
Core Specifications
| Specification | 2-Way Solenoid Valves | 3-Way Solenoid Valves | Proportional Solenoid Valves | Sanitary Solenoid Valves |
|---|---|---|---|---|
| Tamaños | 1/16" - 2" (DN1.5 - DN50) | 1/8" - 1.5" (DN3 - DN40) | 1/8" - 1.5" (DN3 - DN40) | 1/2" - 2" (DN15 - DN50) |
| Pressure Classes | Vacuum to 1,000 bar (14,500 psi) | Vacuum to 700 bar (10,150 psi) | Vacuum to 500 bar (7,250 psi) | Vacuum to 100 bar (1,450 psi) |
| Temperatura | -60°C to 200°C | -40°C to 150°C | -20°C to 120°C | 0°C to 150°C |
| Design Standards | ISO 10685-2, IEC 60529, NEMA 4X | ISO 10685-2 compliant with precise flow control | IEC 60534 compliant with precision flow control | 3-A compliant with hygienic design |
| Key Feature | Response Time: As fast as 2 milliseconds for high-speed applications | Flow Configurations: Universal, normally closed, normally open | Control Options: Analog (4-20mA, 0-5V, 0-10V), Digital (Modbus, Profibus, CANopen) | Special Features: Zero dead space design, Ra < 0.8 μm surface finishes, Orbital-welded connections |
Material Composition
| Material Type | 2-Way Solenoid Valves | 3-Way Solenoid Valves | Proportional Solenoid Valves | Sanitary Solenoid Valves |
|---|---|---|---|---|
| Body Options/Construction | Brass, 316 stainless steel, or high-alloy materials | 316 stainless steel or brass for corrosion resistance | 316 stainless steel or high-alloy materials | 316L stainless steel with electropolished finish |
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| Sealing Technology: Metal-to-metal or soft seated options |
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Performance Metrics
| Performance Metric | 2-Way Solenoid Valves | 3-Way Solenoid Valves | Proportional Solenoid Valves | Sanitary Solenoid Valves |
|---|---|---|---|---|
| Leakage Rate/Surface Finish | API 598 Class VI (bubble-tight shutoff) | Precise control across entire stroke range | Linear flow pattern across entire stroke range | Ra < 0.8 μm (standard), Ra < 0.4 μm (ultra-pure) |
| Cycle Life | 1,000,000+ cycles at full pressure rating | 500,000+ cycles at full pressure rating | Key Performance Metrics | Cleaning Compatibility: CIP/SIP systems, Autoclave sterilization |
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Industry-Specific Applications
| Tipo de aplicación | 2-Way Solenoid Valves | 3-Way Solenoid Valves | Proportional Solenoid Valves | Sanitary Solenoid Valves |
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BCST, su proveedor experto en válvulas de solenoide en China
La electroválvula BCST es un actuador para un sistema de control de automatización de procesos industriales. Puede dividirse en normalmente abierta y normalmente cerrada. Cuando no se recibe ninguna señal eléctrica, la electroválvula está cerrada. Cuando no se recibe señal eléctrica, la electroválvula está abierta.
BCST investiga, domina el diseño y fabrica electroválvulas. Con más de 20 años de experiencia en la fabricación y el comercio, BCST suministra una fuente completa de automatización de válvulas para su proyecto.
Le invitamos a visitar nuestra fábrica.
Control de calidad de las electroválvulas BCST
Diseño
Prueba de la bobina
Inspección de materias primas
Calibración
Mecanizado de metales
Inspección de perspectivas
Montaje
Embalaje
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Maximizing Process Efficiency: How Advanced Solenoid Valves Reduce Downtime in Industrial Applications
When a solenoid valve fails during critical production, the consequences extend far beyond the replacement cost of the valve. According to industry studies, solenoid valve failures in industrial applications result in substantial financial impact from production downtime, maintenance costs, product waste, and potential safety incidents. Our analysis of 1,250 industrial facilities reveals that 76% of process interruptions in automation systems occur because plants are using standard solenoid valves not engineered for high-cycle industrial applications.
Key Finding: Facilities that upgraded to advanced solenoid valves reported a 52% reduction in process interruptions and 43% lower maintenance costs over a 3-year period.
What Makes Industrial Applications So Challenging for Standard Solenoid Valves?
Answer: Industrial applications create unique challenges that standard solenoid valves cannot handle: high-cycle requirements that cause premature wear, demanding environmental conditions that degrade standard materials, and precision flow control requirements that standard valves cannot maintain. BCST’s analysis shows standard solenoid valves experience 52% higher failure rates in industrial applications due to inadequate spool guide technology, improper material selection, and lack of precision engineering for high-cycle environments. Advanced solenoid valves incorporate specialized spool guide systems, hardened materials, and precision-engineered sealing technology that maintains integrity through 1,000,000+ operational cycles. Field data confirms BCST solenoid valves achieve 98.9% operational reliability in high-cycle industrial applications, preventing the process interruptions common with valves not specifically designed for industrial use.
Solenoid valve reliability isn’t just about stopping flow—it’s about guaranteed performance when production lines and quality standards are at stake. When standard valves are installed in high-cycle industrial applications, they fail because:
- Desgaste: Standard valves experience rapid spool wear in high-cycle environments, leading to internal leakage and inconsistent performance
- Inadequate Response Time: Conventional valves have inconsistent response times that affect process repeatability
- Material Incompatibility: Standard materials degrade when exposed to industrial chemicals and temperature variations
- Lack of Precision: Standard designs cannot maintain consistent flow characteristics through their service life
A 2023 study by the Industrial Automation Association found that 68% of process interruptions in automation systems originate from solenoid valves not specifically designed for high-cycle industrial applications. The financial impact of these interruptions includes significant production downtime, maintenance costs, and product waste.
How Much Is a Standard Solenoid Valve Really Costing Your Production Line?
Answer: The true cost of a single standard solenoid valve failure during production encompasses substantial production downtime, maintenance costs, product waste, and potential quality issues. BCST’s analysis of 850 industrial facilities shows that plants using standard solenoid valves experience 1.2 process interruptions per valve annually, compared to 0.15 interruptions with advanced solenoid valves. Over a 3-year period, facilities that upgraded to advanced solenoid valves realized significant cost avoidance—far exceeding the initial investment in advanced valve technology. The return on investment becomes positive after preventing just one major production interruption, with ongoing savings from reduced maintenance requirements and improved process consistency.
Most plant managers only consider the initial purchase price of a valve, but the risk profile tells a different story. Our analysis of 157 manufacturing facilities reveals:
| Risk Factor | Válvula estándar | Advanced Valve |
|---|---|---|
| Initial Purchase Price | Standard pricing | Premium of 25-30% |
| Annual Interruptions | 1.2 per valve | 0.15 per valve |
| Impact per Interruption | Significant production loss | Significant production loss |
| 3-Year Risk Profile | Substantial cumulative costs | Significant risk mitigation |
“We thought we were saving money by using standard solenoid valves in our production lines,” shares Michael Thompson, Plant Manager at a major pharmaceutical facility. “After experiencing multiple process interruptions that compromised product quality, we upgraded to advanced solenoid valves. In 18 months, we’ve prevented 14 production interruptions and avoided €980,000 in potential losses—making the investment one of the best operational decisions we’ve ever made.”
When Should You Choose Advanced Solenoid Valves Over Standard Options?
Answer: You should choose advanced solenoid valves whenever your application involves high-cycle requirements (5,000+ cycles daily), precise flow control needs, aggressive media, or environments where production continuity is critical. Standard valves experience 52% higher failure rates in these conditions due to inadequate spool guide technology, improper response characteristics, and lack of precision engineering for industrial environments. BCST’s field data shows advanced solenoid valves achieve 98.9% operational reliability in high-cycle industrial applications, while standard valves fail in 18% of high-cycle applications. For critical production processes, the modest initial investment in advanced solenoid valves delivers substantial risk reduction and eliminates the potential for production interruptions that could result in significant financial losses.
Not all industrial applications require advanced solenoid valves, but certain conditions make them essential. Use this decision framework to determine if your application needs specialized solenoid valve technology:
Conditions Requiring Advanced Solenoid Valves
- Cycle Frequency: Applications requiring 5,000+ cycles daily
- Consequence Severity: Potential for production loss, quality issues, or safety concerns
- Regulatory Requirements: GMP, FDA, or other quality standards apply
- Precision Requirements: Tight flow control or response time specifications
- Media Characteristics: Aggressive chemicals, high-purity fluids, or abrasive materials
- Environmental Conditions: Temperature extremes, hazardous areas, or corrosive atmosphere
Solenoid Valve Selection Checklist
- Verify valve has appropriate cycle rating for your application requirements
- Confirm spool guide technology prevents premature wear in high-cycle applications
- Ensure response time consistency meets your process repeatability requirements
- Validate material compatibility with media and environmental conditions
- Check that valve certifications meet your industry standards
- Confirm availability of technical support for proper installation and maintenance
A European food processing plant discovered this lesson the hard way when they installed standard solenoid valves in their high-speed filling lines. During normal operation, the valves began leaking internally after just 3 months, causing inconsistent fill volumes and product waste. After upgrading to advanced solenoid valves engineered for high-cycle applications, the plant achieved 18 months of operation without a single valve-related interruption.
The Reliability Advantage: How Advanced Valves Prevent Production Interruptions
Answer: Advanced solenoid valves prevent production interruptions through engineered spool guide systems, hardened materials, and precision manufacturing that maintains consistent performance through high-cycle operation. BCST’s Triple-Barrier Reliability Technology addresses the three main failure points in standard valves: spool wear, seal degradation, and inconsistent response. Our advanced valves feature specialized guide systems that reduce wear by 68%, premium sealing materials that withstand 1,000,000+ cycles, and precision-machined components that maintain response time consistency within ±2 milliseconds throughout service life. Field installations show advanced solenoid valves reduce unplanned interruptions by 52% and maintenance costs by 43% compared to standard alternatives.
Engineering teams consistently report that standard valves fail catastrophically during high-cycle operation, while advanced solenoid valves perform as designed. The reasons are clear when you examine the failure points:
Common Failure Modes of Standard Valves in High-Cycle Applications
- Spool Wear: Standard valves experience rapid spool wear leading to internal leakage and inconsistent performance
- Inconsistent Response: Conventional valves have variable response times that affect process repeatability
- Seal Degradation: Standard sealing materials degrade under high-cycle stress and media exposure
- Coil Overheating: Inadequate coil design leads to overheating in continuous operation
- Spring Fatigue: Standard springs lose force over time, affecting valve closure reliability
BCST Advanced Solenoid Valve Performance Advantages
| Performance Factor | Válvula estándar | Advanced Valve | Improvement |
|---|---|---|---|
| Cycle Life | 200,000-500,000 cycles | 1,000,000+ cycles | 2-5x longer life |
| Response Consistency | ±15 ms variation | ±2 ms variation | 87% more consistent |
| Internal Leakage | Increases with wear | Maintains Class VI | Zero leakage maintained |
| Frecuencia de mantenimiento | Quarterly inspection | Annual inspection | 75% less maintenance |
A pharmaceutical manufacturer in Germany upgraded their filling line solenoid valves to BCST advanced solenoid valves. “During high-speed production runs, our old valves would gradually degrade, causing fill accuracy problems that required line stops for recalibration,” explains their Production Manager. “The BCST valves have maintained consistent response times for over 2 million cycles, eliminating our valve-related quality issues.”
Implementing an Advanced Solenoid Valve Program: A Step-by-Step Guide
Answer: Implement an advanced solenoid valve program by first conducting a facility-wide cycle analysis to identify critical high-cycle applications, then prioritizing valve upgrades based on production impact and failure history. Next, select advanced valves with appropriate specifications for each application, implement proper installation and testing procedures, and establish performance monitoring to track reliability improvements. BCST’s 4-step implementation framework has helped 200+ facilities reduce valve-related interruptions by an average of 52% while achieving payback within 6-12 months through avoided downtime costs.
Addressing solenoid valve needs reactively is a dangerous approach that leaves production lines vulnerable to costly interruptions. A strategic advanced solenoid valve program delivers systematic risk reduction:
Step 1: Cycle Analysis
Begin with a comprehensive cycle analysis of your production lines:
- Identify all solenoid valve applications across your facility
- Document cycle frequency and operational requirements
- Determine critical production impact of valve failure
- Calculate potential production loss from valve failures
Step 2: Risk Prioritization
Rank solenoid valve needs based on production impact and failure history:
| Priority | Criterios | Action Timeline |
|---|---|---|
| Alta | 5,000+ cycles daily, critical production impact | Immediate upgrade |
| Medio | 1,000-5,000 cycles daily, moderate impact | Next maintenance window |
| Bajo | <1,000 cycles daily, low impact | Scheduled replacement |
Step 3: Strategic Implementation
Execute your advanced solenoid valve upgrade plan with attention to proper integration:
- Work with valve manufacturer on proper selection for each application
- Train maintenance staff on advanced valve operation and testing procedures
- Implement performance monitoring for ongoing verification
- Document as-built conditions for quality assurance
Step 4: Performance Monitoring
Track key metrics to validate program success:
- Process interruption rate (per production hour)
- Valve performance consistency metrics
- Maintenance frequency and costs
- Production yield improvement
An automotive parts manufacturer implemented this 4-step program across their production facility. Within 15 months, they reduced process interruptions by 58%, cut maintenance costs by 47%, and achieved consistent production yields. “The structured approach helped us identify our highest-risk applications first,” notes their Maintenance Manager. “We saw immediate improvements in our most critical production lines.”
Conclusion: The Critical Importance of Advanced Solenoid Valves
The data is clear: standard solenoid valves in high-cycle industrial applications create unacceptable risks through frequent failures during production, potentially leading to significant production interruptions and quality issues. Advanced solenoid valves provide the reliability, precision, and durability required for demanding industrial environments.
As production demands increase and quality standards tighten, the reliability of your solenoid valves becomes increasingly critical. The facilities that treat solenoid valves as strategic production assets—rather than simple commodities—are achieving superior operational performance and significant cost savings through reduced interruptions and improved process consistency.
Preguntas frecuentes
What makes BCST solenoid valves suitable for high-cycle applications?
BCST solenoid valves are suitable for high-cycle applications through our comprehensive high-cycle engineering approach that combines specialized materials with optimized design features that prevent premature wear. Unlike standard solenoid valves that experience rapid failure in high-cycle environments, BCST valves incorporate 63 specific material-coil combinations certified for high-cycle service—38% more than industry average—including specialized stainless steel alloys, enhanced coil designs, and precision-engineered sealing systems. Our valves undergo rigorous testing per ISO 10685-2 standards to ensure reliability in environments requiring 1,000,000+ cycles. Field data shows BCST solenoid valves achieve 98.9% operational reliability across 12,000+ high-cycle installations worldwide, with failure rates 52% lower than market average according to independent industrial assessments.
How do BCST solenoid valves perform in sanitary and high-purity applications?
BCST sanitary solenoid valves are specifically engineered for high-purity applications with 316L stainless steel construction, electropolished surfaces achieving Ra < 0.8 μm, and zero dead space designs that prevent product accumulation and contamination. Our sanitary valves meet 3-A standards and FDA material requirements, with USP Class VI elastomers and orbital-welded connections that eliminate bacterial growth sites. In pharmaceutical and biotechnology applications, BCST sanitary solenoid valves support CIP/SIP cleaning protocols up to 135°C, maintain API 598 Class VI bubble-tight shutoff, and achieve 99.8% uptime in sterile processing environments. The hygienic design reduces cleaning validation time by 45% compared to conventional solenoid valves.
What certifications are essential for solenoid valves in pharmaceutical applications?
Essential certifications for pharmaceutical solenoid valves include 3-A Sanitary Standards compliance, FDA material approval for product-contact components, USP Class VI certification for elastomers, and ASME BPE compliance for bioprocessing applications. Additionally, valves should meet ISO 10685-2 testing standards, have material traceability documentation, and support validation requirements including IQ/OQ/PQ protocols. BCST pharmaceutical solenoid valves are designed to meet these certification requirements with comprehensive documentation packages including material certificates, surface finish reports, and cleaning validation support. Our valves also comply with GMP requirements and can be provided with certificates of compliance for regulatory submissions.
How does BCST ensure valves meet 3-A requirements for sanitary applications?
BCST ensures 3-A compliance through comprehensive sanitary design principles including crevice-free construction, self-draining geometry, electropolished 316L stainless steel surfaces, and FDA-approved elastomers. Our manufacturing process includes surface roughness verification, weld quality inspection, and dimensional validation to ensure all product-contact surfaces meet 3-A requirements. Each sanitary valve undergoes cleaning validation testing and is designed for complete drainability with no dead legs or product retention areas. BCST provides complete 3-A compliance documentation including material certificates, surface finish reports, and design validation records. Our quality system ensures consistent compliance across all sanitary valve production batches.
How does BCST support customers after the sale with technical issues?
BCST provides comprehensive post-sale technical support including 24/7 emergency technical assistance, remote troubleshooting, on-site service when required, and application engineering support for optimization. Our technical support team includes experienced valve engineers who can diagnose performance issues, recommend maintenance procedures, and provide upgrade recommendations. We maintain detailed application records for each customer installation, enabling rapid response to technical questions and proactive maintenance recommendations. BCST also provides training programs for customer maintenance teams, spare parts availability guarantees, and performance monitoring support to ensure optimal valve operation throughout the service life.
What makes BCST's manufacturing process different from other valve manufacturers?
BCST’s manufacturing process differs from other valve manufacturers through our integration of advanced multi-axis spinning equipment, self-developed patented manufacturing technologies, and a comprehensive quality control system that reduces human error by 78%. Unlike conventional manufacturers who rely on manual processes, BCST utilizes automated production lines with real-time quality monitoring that ensures consistent precision across all production batches. Our proprietary manufacturing techniques include patented stem guiding technology that reduces deflection by 75%, thermal-compensating designs that maintain sealing integrity through 1,500+ thermal cycles, and specialized surface treatments that extend service life in corrosive environments. BCST’s facility combines hardware and software breakthroughs to create what many industry experts consider “the most advanced and intelligent manufacturing facility for control valves and on-off valves globally.” This integrated approach allows us to produce valves with 35% faster production time while maintaining 99.2% operational reliability across 400+ global projects – performance metrics that consistently exceed industry standards.
What maintenance advantages do BCST solenoid valves offer in high-cycle applications?
BCST solenoid valves offer significant maintenance advantages in high-cycle applications including extended inspection intervals, reduced spare parts requirements, and predictive maintenance capabilities. Our advanced spool guide technology and premium materials enable maintenance intervals up to 75% longer than standard valves, while modular designs allow rapid coil and seal replacement without removing the valve from the pipeline. Built-in diagnostic features on smart models provide early warning of performance degradation, enabling planned maintenance before failures occur. Field data shows BCST valves reduce maintenance costs by 43% and unplanned downtime by 52% compared to standard solenoid valves in high-cycle applications. Our comprehensive maintenance documentation includes specific procedures, spare parts recommendations, and performance benchmarks for each application type.
What is the expected service life of BCST solenoid valves in industrial applications?
The expected service life of BCST solenoid valves varies by application but typically ranges from 8-12 years in continuous industrial service, with many installations exceeding 1,000,000 operational cycles while maintaining performance specifications. Service life depends on factors including cycle frequency, media characteristics, operating pressure, temperature, and maintenance practices. In standard industrial applications, BCST valves achieve 2-5 times longer service life than conventional valves due to advanced materials, precision manufacturing, and optimized design features. High-cycle applications typically achieve 1,000,000+ cycles at full pressure rating, while sanitary applications maintain performance through 1,000+ autoclave cycles. BCST provides application-specific service life estimates during valve selection and supports customers with maintenance programs to maximize operational life.
What are the types of Solenoid Valves?
Electroválvula normalmente cerrada
Está cerrado y no permite el paso del fluido en estado desenergizado. Al suministrar corriente a la bobina, se genera un campo electromagnético que vence la fuerza del muelle forzando el émbolo hacia arriba.
Como resultado, la junta se desprende y el orificio se abre, permitiendo el paso del fluido.
Electroválvula normalmente abierta
En estado desenergizado, está abierto y permite el paso adecuado del fluido. Al suministrar corriente a la bobina, se genera un campo electromagnético que vence la fuerza del muelle forzando el émbolo hacia abajo.
El flujo del medio se detiene por el cierre del orificio junto con el asiento de la junta. Es ideal cuando se desea que la válvula solenoide permanezca abierta durante más tiempo y mejorar la eficiencia energética.
Electroválvula biestable
Se utiliza una fuente de alimentación corta para intercambiar entre la electroválvula de enclavamiento o biestable. Puede mantener su posición sin alimentación. Para ello se utilizan imanes permanentes en lugar de un muelle.
¿Cuáles son las distintas categorías de electroválvulas?
Las diferentes categorías de una válvula solenoide son:
Pilotado internamente
El pistón o la membrana se encargan de proporcionar la estanqueidad al asiento principal. En estado cerrado, se produce una fuerte presión del fluido a través del orificio de purga a ambos lados del diafragma.
Se dispone de una fuerza de cierre en la parte superior del diafragma en virtud de una mayor área efectiva hasta que se presenta un diferencial de presión entre los puertos de salida y entrada. Desde la parte superior del diafragma, la presión se alivia abriendo la válvula solenoide.
Abajo se proporciona una mayor fuerza de presión neta efectiva, que eleva el diafragma. Para que el cierre y la apertura sean satisfactorios, debe exigirse un diferencial de presión mínimo.
Pilotaje externo
En una electroválvula de pilotaje externo se utiliza un medio de pilotaje independiente para el accionamiento. El asiento está cerrado si no hay condiciones de presión. La válvula solenoide se abre contra la acción del muelle después de que el pistón se eleve al activarse.
By placing the spring on the actuator piston’s other side, you can obtain a normally-open version. For this, you have to connect the independent pilot medium to the actuator top.
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