May 2026 — Prom-nasos.com.ua

Cartridge seals are recommended for installation in pumps and mixers operating with such media as non-lubricating liquids, gases, liquids with a high concentration of solids, or those prone to crystallization, as well as adhesives, pastes, paints, and hazardous liquids. Installation of cartridge mechanical seals: Lubricate the shaft with a 2–3% aqueous solution of neutral liquid soap. Slide the cartridge along the shaft until the flange contacts the housing. Check the alignment of the seal on the shaft. Rotate the shaft by hand to detect any potential metal-to-metal noise. If the noise persists, check the shaft alignment. Connect the appropriate lines for flushing, circulation, and barrier fluid. This assembly requires a continuous supply of liquid, known as buffer or barrier fluid, into the chamber where the seal is installed. The pressure of the barrier fluid must be 0.5–2 bar higher than the pressure of the pumped (sealed) liquid. In case of seal failure, the barrier fluid will mix with the process liquid. This feature is especially important when the process liquid is hazardous or contaminating. In a double cartridge seal, connect an external fluid for cooling the secondary seal. In all cases, it is important to ensure that the process fluid contacts the seal before startup, as dry running can severely damage the sealing surfaces, even if it lasts only a short time. Although in some cases dry running cannot be avoided, special material combinations can be recommended to reduce its negative impact. If the seal is located in the oil chamber of a pump filled with biodegradable petroleum jelly oil, this oil (lubricant) remains in the chamber continuously until the next service replacement. There is no pressure in the chamber itself. In case of seal failure, the pumped liquid enters this chamber and mixes with the oil, which is detected by a water presence sensor (if installed). An additional leakage chamber (motor chamber) on the motor winding side is usually empty. If pumped liquid enters this chamber, it may damage the electric motor.