Comprehensive Technical Specifications
Component / Parameter | Standard Specification & Field Options |
Brand / Manufacturer | SDF |
Valve Type | Pneumatic Globe Control Valve (Straight-Through/Angle Pattern) |
Actuator Type | Pneumatic Diaphragm Actuator (Multi-Spring, Heavy-Duty) |
Action Type | Air-to-Open (Fail Close) / Air-to-Close (Fail Open) |
Nominal Diameter | DN15 to DN100 (1/2" to 4") – Specific model as shown: Small Bore |
Pressure Rating | PN16, PN40, PN63 / ASME Class 150, Class 300, Class 600 |
Valve Body Material | ASTM A351 CF8, CF8M, CF3M (Stainless Steel) / WCB (Carbon Steel) |
Trim Material | 304 / 316 Stainless Steel with Stellite Hard Facing (Optional) |
Seat / Plug Design | Parabolic Plug, V-Port Plug, Cage-Guided Trim |
Flow Characteristics | Equal Percentage, Linear, Quick Opening |
End Connections | NPT Threaded, Socket Weld (SW), Flanged (RF/RTJ) |
Positioner Type | Electro-Pneumatic Positioner (4-20mA Input, Smart/Intelligent Type) |
Supply Air Pressure | 0.14 to 0.40 MPa (1.4 to 4.0 bar) |
Accessory Package | Air Filter Regulator, Limit Switches, Junction Box, Solenoid Valve |
Key Features and Engineered Advantages
Superior Modular Integration (一体化高度集成): Unlike standard field-assembled valves, the SDF control valve loop arrives as a fully assembled, calibrated, and benchmark-tested system. The seamless piping between the air filter, positioner, and actuator chamber eliminates the risks of pneumatic leakage and on-site alignment errors, drastically reducing installation time and commissioning costs.
Highly Responsive Diaphragm Actuator (灵敏型气动薄膜执行机构): Crafted with high-grade elastomeric diaphragms and a multi-spring structure, the actuator provides smooth, linear stroke replication in response to subtle pressure fluctuations. The ruggedized gold-enameled casing offers superior corrosion resistance against harsh outdoor and marine atmospheric conditions.
Precise Flow Modulation & Cage-Guided Trim (精准流量控制): The globe body design minimizes dead zones and fluid turbulence, mitigating the risk of cavitation and flashing. The carefully calibrated internal plug provides precise flow clipping, ideal for severe-service applications requiring exact micro-flow adjustment.
Dual-Mode Control with Manual Override (手自一体辅助机构): Equipped with a robust, side-mounted or top-mounted handwheel manual operator. In the event of an unexpected plant air supply failure or power loss, plant operators can effortlessly override the pneumatic system to manually reposition the valve, maintaining process continuity and preventing plant downtime.
Smart Feedback & Fieldbus Compatibility (智能定位与反馈系统): The integrated electro-pneumatic positioner features a high-visibility mechanical pointer indicator alongside advanced diagnostic micro-circuits. It supports standard 4-20mA analog control loops and can be upgraded to support HART, Profibus, or Foundation Fieldbus protocols for real-time asset tracking and predictive maintenance.
Typical Industry Applications
Thanks to its robust construction and high control fidelity, this pneumatic control valve assembly is widely deployed in:
Chemical & Petrochemical Processing: Corrosive fluid dosing, reactor temperature control, and high-pressure gas venting.
Power Plants & Boiler Systems: Feedwater control loops, steam desuperheating, and condensate level management.
Refineries & Tank Terminals: Fuel oil blending, precise pressure regulation on separator vessels, and custody transfer skids.
Food, Beverage & HVAC Utilities: High-purity steam sterilization piping, chilled water loops, and clean utility distribution networks.
Quality Control and Compliance Standards
Every single SDF control valve system undergoes a rigorous multi-step inspection protocol prior to shipment. Our testing criteria strictly align with international industry benchmarks:
Pressure Testing: Hydrostatic and pneumatic shell/seat tests in compliance with API 598 and ASME B16.34.
Control Calibration: Stroke linearity, dead-band analysis, and hysteresis loop verification to satisfy IEC 60534 standards.
Leakage Classification: Standard soft-seated plugs achieve ANSI/FCI 70-2 Class VI (bubble-tight shutoff), while metal-to-metal configurations meet Class IV or Class V requirements.
FAQ
1.When can I get a quotation?
We typically provide a quotation within 4 hours of receiving your inquiry. Urgent requests are given priority.
2.Do you support customized valves?
Yes. We support OEM and customized valves according to drawings, specifications, and special working conditions.
3.What is the production lead time?
Normally, production can be completed within 15 working days after order confirmation, depending on product type and quantity.
4.What standards do your valves comply with?
Our products comply with GB, ANSI, API, JIS, DIN, BS, and other international standards.
5.What pressure, size, and temperature ranges can you supply?
Pressure: Class 150-3500 Size: DN10-DN3000 Temperature: -196ºC to 610ºC
6.What certifications do you have?
We are certified with ISO 9001, CE, and provide third-party inspection and test reports upon request.
7.What delivery and payment terms do you offer?
Delivery terms: EXW, FOB, CFR, CIF
Payment terms: T/T (30% deposit + 70% balance), L/C, and other terms by agreement.
8.Do you provide technical support and spare parts?
Yes. We offer 24/7 technical support and supply spare and consumable parts for long-term service.
