Views: 0 Author: Site Editor Publish Time: 2026-09-07 Origin: Site
Chemical pumps keep throwing heat, pressure and corrosive fluid at the seal face, minute after minute. One face carries all of it. KSCN sits still while the shaft turns. Sized for ISO2858 and other compact chambers, rated 20 bar and 150 °C, shaft 24 to 100 mm. OEM lines use it as the single seal that stays put where a pusher would start to walk.
A pusher seal spins its whole face set with the shaft. At high speed that mass fights centrifugal load and the face can walk out of seat. The KSCN keeps the faces and spring stationary in the gland, shaft turning inside. Less load to fight, the face stays put. The solid one-piece structure resists the deformation heat and cold both bring, so the face does not drop or shift when the duty swings. On bigger shafts and higher speeds that is the difference between a seal that runs and one that becomes the next breakdown.
KSCN comes ready as a cartridge. Slide it on, set the clip, it is in. No faces and springs to stack on site, no stack length to guess. From 24 to 100 mm it lands in ISO2858 chambers and the smaller boxes. A packing gland turns into a cartridge seal without opening the stuffing box. The standard build carries an oil seal in the package, which keeps the bearing side clear of the product.
Metal is not the place to save. The wetted side is 316SS throughout. Sleeve, gland, clamp ring, drive screw, circlip, clip screw. Rotary face SSIC or tungsten carbide. Stationary face Carbon, SSIC or TC, picked per the fluid. Spring in Alloy 276, the one that will not pit in corrosive service. O-rings EPR, Viton, Aflas or Kalrez, gasket AF1. The setting clip is brass. On a mild line EPR is the usual call and it is left at that. At the edge of the range the elastomer choice is what keeps the seal alive.
Chemical and petrochem, oil and gas, water treatment, pharma and food, hazardous handling, marine. Any ISO2858 or compact chamber on a chemical pump that needs a single seal instead of packing. Built in China by FBU SEALS.
Configuration | Stationary single cartridge mechanical seal (Qn/Tn type) |
|---|---|
Shaft diameter | 24 to 100 mm (1.000" to 4.000") |
Pressure | ≤ 20 bar |
Temperature | -20 °C ~ +150 °C |
Sliding velocity | ≤ 20 m/s |
Seal chamber | ISO2858 standard chambers and other compact pump chambers; packing replacement |
Recommended piping plans | 52, 53A, 53B, 53C, 54 |
Rotary face | SSIC / TC |
Stationary face | Carbon / SSIC / TC (per fluid) |
Structural parts | 316SS throughout; spring Alloy 276 (Hastelloy C276); setting clip brass; oil seal NBR + 316SS |
O-rings / gasket | EPR / Viton / Aflas / Kalrez; gasket AF1 |
Warranty | 3 years |
Q: What is a stationary single mechanical seal and how is it different from a pusher seal?
A: A stationary single seal locks the faces and spring in the gland while the shaft turns inside. A pusher seal takes the whole set around with the shaft. Past a certain speed that mass fights centrifugal load and the face drifts off its seat. KSCN holds the faces still in the gland and is sized for ISO2858 and compact chemical-pump chambers.
Q: Can the KSCN replace a packing gland on a chemical pump?
A: Yes. As a cartridge it drops into ISO2858 and other compact chambers without touching the stuffing box, so a packing gland turns into a cartridge seal. Sizes span 24 to 100 mm, which is why OEM and retrofit lines reach for it when they want to drop packing.
Q: Which pumps and chambers does the KSCN stationary single seal fit?
A: ISO2858 seal chambers and other compact pump chambers, including OEM-built chemical pumps. Shaft range 24 to 100 mm (1.000 inch to 4.000 inch). The cartridge arrives with the setting clip fitted, so nothing gets stacked in the field. A standard centrifugal chamber takes it as is.
Q: What pressure and temperature can the KSCN stationary single seal handle?
A: Rated 20 bar, -20 to 150 °C, sliding speed to 20 m/s. The solid stationary body shrugs off the deformation heat and cold cause, so the face holds through duty swings. Most chemical-pump single-seal duties sit inside that band. Push beyond it and a double seal makes more sense.
Q: What piping plan does the KSCN stationary single seal use?
A: Plans 52, 53A, 53B, 53C or 54. Most plants already run one of them, so the piping stays as it is. On this duty 53A or 54 turns up most often.
Q: What are KSCN seal faces and springs made of?
A: Rotary face in SSIC or tungsten carbide. Stationary face in Carbon, SSIC or TC, picked per fluid. Wetted parts are 316SS throughout. Spring in Hastelloy C276, clip in brass, oil seal NBR with 316SS. O-rings in EPR, Viton, Aflas or Kalrez, gasket AF1. Pick the elastomer for the fluid and the seal lasts.
