Elastomer bellow mechanical seal AS-E21, can be replaced of Johncrane 21.

Suggested operating limits

Temperature: -20 - 120℃

Speed: ≤15m/s

Pressure≤1.0Mpa

Combined material

Rotary face: Carbon/Sic/TC

Stat Ring: Ceramic/Sic/TC

Seat Type: Standard AS-S11, Alternative AS-S20/S21.

Features

The drive band's "dent and groove" design eliminates overstressing of the elastomer bellows to prevent bellows slip and protect the shaft and sleeve from wear.

Non-clogging, single-coil spring provides greater dependability than multiple spring designs and will not foul due to fluid contact.

Flexible elastomer bellows automatically compensates for abnormal shaft-end play, run-out, primary ring wear and equipment tolerances.

The Type 21 is ideal for use in centrifugal, rotary and turbine pumps, compressors, chillers and other rotary shaft equipment. It is also commonly used by the waste water and water systems industries for applications such as waste treatment, potable water and HVAC.

Also we could manufacture seals according to your drawing, and design as your request.

Asinoseal’s products are mainly for the chemical industry, electric power, shipbuilding, oil exploration, refining, papermaking, printing and dyeing, pharmaceutical, sewage treatment. Perennial with a number of supporting the production of mechanical seal pump. 

The company tried to promote the investment of high-tech, high-tech product development, learn from the same industry and users with an open mind, absorb domestic and foreign advanced technology, perfect their own products, and constantly improve and strengthen the quality management system, laying a solid foundation for the stable quality of products. Company has always been to high-quality products, quality service, high-quality reputation into a competitive market.

Welcome to buy the quality johncrane type 21 water pump mechanical seal ,pump and seals made in china from mechanical seals manufacturer made in China in stock from us, which is competitive in its delicate equipment and good performance. We are one of the leading such manufacturers in China, offering you the customized service. We won't let you down.