KOSO is a company specializing in the research, development, production, and sales of industrial automation instruments and related products. Its product range includes, but is not limited to, valve positioners and electro-pneumatic transducers, which are widely used in industries such as oil, chemical, power, and metallurgy.
A valve positioner is a key accessory for control valves, typically used in conjunction with pneumatic control valves. It ensures that the valve accurately positions in response to signals from the controller, thereby precisely controlling process parameters such as pressure, flow rate, and temperature of fluids. KOSO valve positioners are known for their high precision, stability, and reliability.
| Product Name |
valve positioner |
| Brand |
KOSO |
| Model |
PPA801-L2 |
KOSO offers a variety of valve positioner models. Below are some commonly used ones, along with their key features
-
EPA801 / EPA804
- These are electro-pneumatic valve positioners typically used to convert electrical signals into pneumatic signals to control valve positioning.
- Features: High precision, fast response time, support for HART communication protocol, easy installation, and compatibility with various types of actuators.
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EPB801 / EPB811
- Also, electro-pneumatic positioners may offer different mounting options or functional characteristics to suit various actuator types.
- Features: Explosion-proof design (suitable for hazardous environments), smart programmability, built-in feedback system, and robust construction.
-
EPC811 / EPC821
- Designed specifically for quarter-turn valves such as butterfly valves and ball valves.
- Features: Compact and lightweight design, high durability, optimized for angular motion applications, and excellent corrosion resistance.
-
CL-420 / CL-523
- Part of the locking valve series, these are not typical valve positioners but are used to lock instruments or shut off air lines in on/off or safety applications.
- Features: Wide pressure setting range, maximum operating pressure up to 800 kPa, suitable for a variety of industrial safety and isolation applications
The Role of Valve Positioners in Industrial Applications
Valve positioners play a crucial role in industrial automation systems, especially in applications that require precise control of fluid flow. Below are the main functions and benefits of valve positioners in industrial settings:
1. Precise Control
Valve positioners ensure that control valves adjust their opening accurately according to signals from the controller. This enables precise regulation of process parameters such as flow rate, pressure, and temperature. Accurate control is essential for maintaining product quality and the stability of production processes.
2. Improved Response Speed and Accuracy
By converting electrical signals into motion in pneumatic or electric actuators, valve positioners significantly enhance the response speed of valves and reduce errors caused by environmental changes or variations in media properties.
3. Overcoming Friction and Unbalanced Forces
During operation, valves may encounter various resistances, such as packing friction or unbalanced pressure differentials. Valve positioners provide additional force to overcome these obstacles, ensuring that the valve operates as intended.
4. Support for Remote Control and Monitoring
Many modern valve positioners are equipped with digital communication interfaces (e.g., HART, PROFIBUS, or FOUNDATION Fieldbus), allowing integration with Distributed Control Systems (DCS). This enables remote configuration, diagnostics, and real-time monitoring.
5. Adaptability to Complex Operating Conditions
For special applications involving high temperatures, high pressures, or corrosive media, specially designed valve positioners can deliver reliable performance, meeting the demands of diverse industrial environments.
6. Fault Detection and Self-Diagnosis
Intelligent valve positioners often include fault detection and self-diagnostic capabilities. They can issue alerts when abnormalities occur, helping maintenance personnel quickly identify issues and take corrective actions.
In summary, valve positioners not only improve the precision and efficiency of industrial process control but also enhance system reliability and safety. They are an indispensable component in achieving efficient and stable production.
KeRui (Weifang) Automation Equipment Co., Ltd. specializes in industrial automation instrument development, production and sales, technical services, and supporting equipment supply to specialized companies. The main products are flow meters, level meters, temperature meters, pressure meters, electrical meters, thermal intelligent meters, programmable controllers (PLC), DCS distributed control systems, and eight series of more than 1,000 specifications. Its products and technologies are widely used in electric power, metallurgy, petrochemicals, environmental protection, plastics, food, printing, tobacco, textile, dyeing, and other fields.
FAQ
Q: How long will you give me the reply?
A: We will reply to you as soon as we see the information
Q: What is the delivery time?
A: The products in stock will be shipped after receiving the payment, and the products that need to be ordered are subject to the factory's time.
Q: How about your package?
A: Do not worry about the package, we have rich experience in packing.
Q: How about the payment terms?
A: You can choose T/T.
Q: What is the MOQ?
A:1PC.
Q: Can I get a lower price if I order large quantities?
A: Yes, cheaper prices with more bigger size orders.
Q: After sales and warranty?
A: We provide a one-year warranty and lifetime technical support services.
Company Advantages of KeRui (WeiFang) Automation Equipment Co., Ltd.
KeRui (WeiFang) Automation Equipment Co., Ltd. is a leading manufacturer and innovator in industrial automation solutions, specializing in pressure transmitters, flowmeters, handheld communicators, valve positioners, and related instrumentation. With decades of expertise and a global reputation for quality, we are committed to delivering cutting-edge products tailored to meet diverse industrial demands. Below are our core competitive advantages:
1. Advanced Technology & Precision Engineering
High-Accuracy Pressure Transmitters: Our pressure transmitters achieve ±0.075% reference accuracy (digital) and ±0.1% (analog), ensuring reliable measurements even in extreme conditions (-40°C to 150°C). Leveraging 18-bit ADC technology, they minimize environmental temperature drift for long-term stability. Smart Flowmeters: Our variable area flowmeters (e.g., ZYZZ series) feature geomagnetic compensation, LCDs, and Exd II CT6 explosion-proof certification, suitable for hazardous environments like oil & gas and chemical plants.Valve Positioners with Auto-Calibration: Equipped with Foundation Fieldbus protocol compatibility, our valve positioners enable automatic zero/span adjustment and reduce commissioning time by 50%, ensuring optimal control loop performance
2. Robust Quality Control & Certifications
ISO 9001 & API Compliance: Adhering to ISO 9001:2015 and API standards, we implement rigorous quality checks from raw material selection to final testing. Durable Construction: Products feature 316L stainless steel, PTFE/PFA coatings, and IP67/IP68 protection, ensuring corrosion resistance and longevity in harsh environments. Global Certifications: Our devices meet ATEX/IECEx, SIL 2/3, and NAMUR NE 21/43 standards, making them compatible with international safety and regulatory requirements
3. Customization & Versatility
Tailored Solutions: We offer custom sensor matching (e.g., RTD, thermocouple) and output signal customization (4-20mA, HART, PROFIBUS) to align with specific application needs Wide Application Coverage: Products are designed for industries including oil & gas, water treatment, chemical processing, and HVAC systems, with flowmeters supporting flow rates from 20Nm³/h to 5000Nm³/h Multi-Function Handheld Communators: Our handheld devices provide intuitive configuration, real-time diagnostics, and PID control integration, streamlining field operations.
4. Innovation & R&D Excellence
In-House R&D Team: With 6+ dedicated engineers, we continuously innovate in materials (e.g., H-alloy sensors) and software (e.g., predictive maintenance algorithms).Smart Features: Products integrate self-diagnostic alerts (e.g., sensor drift detection) and IoT readiness, enabling seamless integration into Industry 4.0 systems.
5. Efficient Production & Global Service
Large-Scale Manufacturing: Operating 7 production bases with 5,000+ annual capacity, we ensure fast delivery and cost-effectiveness Comprehensive Support: Our 51% localized overseas teams provide 24/7 technical assistance, onsite training, and spare parts supply Warranty & Traceability: All products come with a 1-year warranty and full lifecycle traceability, backed by digital documentation for easy maintenance.
6. Sustainable & User-Centric Design
Energy Efficiency: Devices like low-power flowmeters (3.6V lithium battery option) reduce operational costs
Ergonomic Interfaces: Features like dual-indication displays (LCD + analog) and WAGO spring-clamp terminals simplify installation and reduce downtime.
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