204 Series
Category:Reactor Seal Series
1. Balanced,
2. Single-face mechanical seal
3. Multi-spring
Detailed introduction
Key selling points: Multiple models available + Easy installation + Wide applicability + Reliable sealing + Long service life
The 204 series mechanical seals are a commonly used sealing solution for agitator shafts in reaction vessels! Available in multiple models, they precisely match various operating conditions, are easy to install and highly reliable in use. They can handle a wide range of media—including acids, alkalis, and oils—and are suitable for both low- and high-speed applications!
✅ Core Structure and Model Differences
▶ Model 204: Single-face multi-spring balanced design, with fixed-ring positioning and screw-adjustable spring compression; sealing pressure exceeds the medium pressure inside the vessel, preventing external leakage and suitable for both low- and high-speed operating conditions.
▶ Model 204B: Single-face, multi-spring, external-flow, unbalanced type; fixed-ring positioning + screw-adjustable compression, ensuring reliable installation.
▶ Model 204E/204F/204H: Single-seal + flange structure, highly versatile and long service life.
✅ High-quality material selection
▶ Rotating rings: stainless steel, alumina ceramic, graphite-impregnated phenolic/furan;
▶ Stationary ring: Resin-, glass fiber- and graphite-reinforced polytetrafluoroethylene;
▶ Auxiliary sealing rings: nitrile rubber, fluoroelastomer, silicone rubber;
▶ Elastic element: 1Cr18Ni9Ti.
✅ Key points for installation and adjustment
▶ Model 204: Axial runout ≤ 0.5 mm; perpendicularity between the mounting flange and the shaft axis ≤ 0.05 mm; shaft tolerance h8, surface finish 1.6; suitable for both positive and negative pressures—when under positive pressure, the high-level tank is connected to the air source at a pressure slightly higher than that inside the reactor by 0.05–0.1 MPa.
▶ Model 204B: Uses a fixed ring for positioning; simply adjust the spring compression with screws. Installation is straightforward and reliable.
🔥 204 Series: A Choice for Quality
Made from high-quality materials and available in multiple models to suit various operating conditions, this seal offers reliable sealing performance, hassle-free installation, and a long service life—making it the ideal solution for agitator shaft seals in reaction vessels!
Applicable host
Product Features
Use parameters
1. Media: Oil, water, weak alkali, weak acid, and flammable/explosive media
2. Temperature: -40℃ to 180℃
3. Pressure: 0–0.8 MPa
4. Linear velocity: ≤20 m/s
Keywords：204 Series
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Plan 23
Core positioning: A single-face seal self-flushing solution specifically designed for hot-water pumps. The medium is guided out of the self-sealing cavity, cooled, and then returned to the sealing face, achieving integrated self-circulation for flushing and cooling without the need for additional medium replenishment.
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Plan 53A
Reason for adoption: Isolate the process fluid. Zero discharge of the process fluid.
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Plan 53B
Reason for adoption: Isolation of process liquids; zero discharge of process fluids; pressure exceeding the 53A scheme.
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Plan 53C
Reason for adoption: Isolate the process fluid. Achieve zero discharge of the process fluid. Pressure exceeds the 53A design specification. Dynamically monitor system pressure.
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