KSC Stationary Single Seal: The Standard Cartridge Mechanical Seal for Higher-Efficiency OEM Customers

The KSC stationary single seal from FBU SEALS is the standard, higher-efficiency cartridge seal built for OEM customers who need one reliable, uniform sealing solution across their chemical and centrifugal pump lines. As a stationary-face (SN) single seal with a modular cartridge design, it delivers consistent performance, easy standardization, and a 3-year warranty — without the complexity of a double seal.

The KSC uses stationary face compensation technology: the seal face stays put while the rotating assembly turns, so the faces remain correctly loaded and never drop or shift even at speed. Its solid, robust structure resists deformation under both high- and low-temperature duty, and the standard design can be fitted with throttle bushings or oil seals to match the application. The result is a standardized single seal that OEMs can specify with confidence.

Covering shaft diameters from 24 mm to 100 mm (1.000" to 4.000"), the KSC is rated to 20 bar, temperatures from -20 °C to +150 °C, and sliding velocities up to 20 m/s. It is designed for ISO 2858 standard seal chambers and other compact chambers, and can be supplied as a containerized mechanical seal to replace traditional packing — a genuine drop-in upgrade for most general-duty centrifugal pumps.

Material selection follows real chemical-pump duty. The shaft sleeve, gland, clamp ring, drive screw and circlip are 316 stainless steel; the rotary face is silicon carbide (SSIC) or tungsten carbide (TC) and the stationary face is Carbon, SSIC or TC; O-rings are available in EPR, Viton, Aflas or Kalrez to suit the medium; and the spring is Alloy 276 for long service life.

Across industries, the KSC serves chemical and petrochemical plants, the oil, gas and energy sector, water treatment and environmental protection, pharmaceutical and food & beverage lines, hazardous-chemical and specialized processes, and marine and offshore engineering — wherever a standardized, maintenance-friendly single seal is the right call.

What makes the KSC the right choice for higher-efficiency OEM customers is standardization: a modular cartridge that drops into ISO 2858 chambers, replaces packing, and carries a 3-year warranty with a typical 4-week lead time. For pump builders who need uniform, dependable sealing across a product range, the KSC is the practical, warranty-backed standard.

Frequently Asked Questions (FAQ)

Q: What is a stationary single mechanical seal?

A: A stationary single mechanical seal, such as the FBU SEALS KSC, keeps the seal face stationary while the rotating parts turn, using stationary-face compensation to hold the faces in contact. It is a standard single-cartridge solution for chemical pumps and other general-duty centrifugal pumps.

Q: What shaft size does the KSC stationary single seal fit?

A: The KSC fits shaft diameters from 24 mm to 100 mm (1.000" to 4.000"). It is rated to 20 bar, temperatures from -20 °C to +150 °C, and sliding speeds up to 20 m/s.

Q: Is the KSC seal compatible with ISO 2858 pumps?

A: Yes. The KSC is designed for ISO 2858 standard seal chambers and other compact chambers, and can be supplied as a containerized seal to replace traditional packing — a true drop-in for most general centrifugal pumps.

Q: What materials are used in the FBU SEALS KSC seal?

A: The shaft sleeve, gland, clamp ring, drive screw and circlip are 316 stainless steel; the rotary face is SSIC or TC, the stationary face is Carbon, SSIC or TC; O-rings come in EPR, Viton, Aflas or Kalrez; and the spring is Alloy 276.

Q: Can the KSC single seal replace pump packing?

A: Yes. The KSC's modular containerized design lets it replace packed stuffing boxes on chemical pumps, cutting leakage and maintenance while keeping a standardized fit.

Q: What is stationary face compensation technology?

A: Stationary face compensation keeps the stationary seal face correctly loaded against the rotating face even as the shaft moves or wears, so the seal maintains contact and avoids face drop or displacement at speed — improving reliability.

Q: What is the lead time and warranty for the KSC seal from FBU SEALS?

A: Standard lead time is about 4 weeks— making it a dependable, standardized choice for OEM customers who need consistent, higher-efficiency sealing.