EASTERN Centrichem pumps utilize mechanical seals exclusively on all models. Mechanical seals are the preferred sealing method in most applications, and offer many advantages over conventional packed stuffing boxes:
A wide variety of seal configurations provide the best selection of elastomers and mating faces in order to handle a wide range of corrosive liquids.
Type 21 and Type 9 seals cover the widest range of services. These seals are dimensionally interchangeable. They operate in the same manner, using spring tension to keep their stationary and rotating faces in contact.
Primary sealing is accomplished by interaction of the lapped stationary and rotating faces. Secondary sealing occurs at the shaft by means of a tight fitting bellows in the Type 21 design, or a PTFE wedge in the Type 9 arrangement. The final sealing point occurs at the static seat by means of either an elastomeric O-ring or a PTFE ring.
EASTERN Centrichem pumps are available in 316 stainless steel and Alloy C. These materials are suitable for a wide variety of acid and alkali solutions.
The EASTERN Centrichem 5H Model is rated to 94 GPM with a shut off head of 365 ft., for continuous heavy-duty chemical transfer or process service.
EASTERN Centrichem Series ECH5 designed with high efficiency, low-NPSHR end suction with a closed impeller close-coupled to mount to any standard 143/5TC or 182/4C motor. Pump is also available power frame mounted. PTFE O-rings seals. These heavy-duty units handle high volumes at high pressures under severe operating conditions. Impellers and stages are precision cast for high strength and chemical resistance. Maximum standardization of parts minimizes and simplifies maintenance. Consult factory for metric motor adapters.
Type 21 mechanical rotary seals with carbon, Viton, and ceramic are standard on all 316 stainless steel pump models. Type 9 seals with chemical-grade carbon, PTFE and silicon carbide are optional on 316 stainless steel models and standard on Alloy C models. Double Type 9 seals are available in the same materials.
Eastern Centrichem Brochure