Conventional Series Control Valve Fundamentals and Operation
2025-08-15
This comprehensive guide explores Conventional Series Control Valve technology from LOZOSE, covering operational principles, technical specifications, installation best practices, and maintenance protocols. We'll examine valve types, performance characteristics, and industry applications to help you select and maintain the optimal control solution for your system.
1. Conventional Series Control Valve Fundamentals
Conventional Series Control Valves regulate fluid flow by varying the size of the flow passage, responding to signals from control systems. LOZOSE valves feature:
Key Working Principles:
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Modulating action: Precise 4-20mA signal response
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Pressure balancing: Maintains stable flow characteristics
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Fail-safe positions: Spring return or pneumatic hold
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Linear/equal % flow: Selectable characteristics
Primary Components:
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Actuator: Pneumatic, electric, or hydraulic
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Valve body: Cast steel, stainless, or alloy
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Trim: Plug, seat, and stem assembly
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Positioner: Smart or conventional
2. LOZOSE Product Specifications
Technical Parameters
| Model | Size Range | Pressure Rating | Temperature | Flow Coefficient (Cv) | Body Material |
|---|---|---|---|---|---|
| LZ-CV100 | ½"-4" | ANSI 150-900 | -40°C~450°C | 5-200 | WCB/CF8M |
| LZ-CV200 | 2"-12" | ANSI 150-2500 | -196°C~650°C | 50-1000 | WC6/CF8 |
| LZ-CV300 | 3"-16" | ANSI 900-4500 | -29°C~550°C | 200-5000 | F91/F316 |
Performance Features
✔ Leakage Class: ANSI IV-VI (FCI 70-2)
✔ Stroking Speed: 1-60 sec (adjustable)
✔ Position Accuracy: ±0.5% full scale
✔ Certifications: API 609, ISO 15848
3. Installation and Commissioning
Pre-Installation Checks
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Verify piping cleanliness
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Confirm flow direction (arrow marking)
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Check actuator orientation
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Inspect gasket surfaces
Startup Procedures
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Pre-commissioning:
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Air supply verification
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Stroke testing
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Leak checks
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Calibration:
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Zero/span adjustment
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Characteristic verification
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Deadband optimization
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Maintenance Schedule
| Task | Interval | Tools Required |
|---|---|---|
| Packing Adjustment | Quarterly | Torque wrench |
| Stem Lubrication | Monthly | High-temp grease |
| Full Overhaul | 5 years | Valve repair kit |
| Positioner Calibration | Annually | Calibration set |
4. Industry Applications and Selection Guide
Application-Specific Solutions
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Oil & Gas: High-pressure trims (LZ-CV300)
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Power Generation: Steam-rated designs (450°C+)
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Chemical Processing: Alloy construction (Hastelloy)
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Water Treatment: Rubber-lined bodies
Selection Criteria
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Fluid Properties: Corrosivity, viscosity, solids
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Process Conditions: ΔP, temperature, flow rate
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Control Requirements: Precision, speed, fail-safe
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Environmental Factors: Area classification, weather
Why Choose LOZOSE Conventional Series Valves?
✔ Precision-machined components (≤3μm surface finish)
✔ Extended service life (10+ years typical)
✔ Custom trim configurations
✔ Global technical support network
✔ ISO 9001 certified manufacturing
Contact Our Valve Specialists:
📧 Email: [email protected]
With 25 years in control valve engineering, I personally guarantee LOZOSE Conventional Series Control Valves deliver reliable, precise flow control for your critical processes. Our application engineers are ready to assist with your specific requirements.
