Overview

The LKV T(A/B) F46-10/16 series Teflon-lined pneumatic diaphragm weir-type control valve is a specialized process control terminal engineered for highly corrosive, high-viscosity, and particulate-bearing fluid services. Covering nominal diameters from DN15 to DN200 and pressure ratings from 0.6 to 2.5 MPa, this product line accommodates everything from fine chemical branch lines to large main pipelines. With flanged end connections, it ensures a robust and leak-tight interface with the piping system. Its core innovation lies in the packless weir-type diaphragm sealing structure, with all wetted internal surfaces fully lined with high-performance F46 (perfluoroethylene-propylene). Combined with a precision pneumatic diaphragm actuator, this design enables accurate linear flow regulation of strong acids, alkalis, organic solvents, and even slurry-type fluids across a wide temperature range of -20 °C to 180 °C, making it an ideal component for automatic control systems in the chemical, petrochemical, metallurgical, pharmaceutical, and environmental protection industries where corrosive and challenging media are present.

Product Image: Teflon-Lined Pneumatic Diaphragm Weir-Type Control Valve LKV T(A/B) F46-10/16

Feature

Full F46 Lining with Diaphragm-Type Corrosion Resistance: All surfaces of the body, bonnet, and diaphragm that contact the process fluid are fully encapsulated with a high-quality F46 lining, while the diaphragm provides complete isolation. Utilizing its outstanding chemical inertness, this structure completely isolates the metal substrate from aggressive media, withstanding prolonged exposure to virtually all strong acids, alkalis, and organic solvents. The diaphragm design also effectively prevents clogging of the stuffing-box area by high-viscosity media.
Wide Size Range and Pressure Ratings: The series offers a full spectrum of diameters from DN15 to DN200 and pressure classes PN10/PN16 (0.6-2.5 MPa), providing flexible selection to match various pipe sizes and system pressure requirements. It is particularly effective in high-differential-pressure, high-flow, or fiber-laden corrosive applications.
Precise Pneumatic Diaphragm Control: Equipped with a high-performance multi-spring pneumatic diaphragm actuator featuring high sensitivity, fast response, and stable output force. When paired with a smart positioner, it enables proportional control via standard 4-20 mA signals with excellent accuracy. The flow characteristic is approximately linear, precisely matching complex process control strategies.
Stable Operation Across a Wide Temperature Range: Through the synergistic thermodynamic design of the F46 lining and reinforced diaphragm structure, the valve maintains dimensional stability and superior sealing performance at media temperatures ranging from -20 °C to 180 °C. The lining and diaphragm remain free from softening or cracking, ensuring reliable continuous regulation of hot corrosive fluids.
Optional Body Materials for Versatility: Available in two base materials—cast steel and stainless steel. The cast steel body offers high strength and cost-effectiveness for standard corrosive services. The stainless steel body provides enhanced resistance to atmospheric and intergranular corrosion, specifically engineered for extreme environments such as marine climates or applications with high chloride concentrations.