Rubber Bellows Mechanical Seal WM21

Rubber bellow mechanical seal WM21 developed with rubber bellow is mainly used for water, oils, and light duties applications. The rubber bellow seal is single-acting and independent of the direction of rotation. These rubber bellow mechanical seals WM21 have a unique rubber bellow as an inferior seal with the self-aligning features which help in compensating the abnormal shaft and run-out to provide long service life. The rubber bellows seal protects the shaft or sleeve from fretting.

Product Description

Wendong is China best rubber bellow seal suppliers. The offered products are widely acknowledged for their fine finish, accurate dimensions, durability, anti-corrosion, and capacity to bear high temperature. Our rubber bellow mechanical seal WM21 is highly durable and corrosion-resistant as well. Due to the compact design, our standard mechanical seals eliminate the requirement of extra radial and axial space in their installation. Furthermore, we also offer a customized range of these products in order to fulfill the specific demands of our clients.

The Advantages of Rubber bellow mechanical seal WM21

1. Low cost. 

It is probably the largest mass-produced seal in the world.

2. No sliding elastomer or O-ring. 

Nothing to “hang up” on the shaft.

3. Easy to install. 

There are seldom any measurements to make or set screws to tighten to the shaft. Most designs are positioned against a shaft shoulder, or attached to a shoulder cast into the back of the impeller. Push it on the shoulder, and that is all there is to it!

4. Availability. 

You can purchase these seals from a variety of manufacturers, distributors, and bearing houses. Most distributors have replacement charts that will reference your present seal and recommend an equivalent design.

5. No shaft or sleeve fretting. 

When installed properly, the seal cannot frett or damage a shaft or sleeve because there is no relative movement between the rubber boot and shaft or sleeve.

Performance Capabilities of Rubber bellow mechanical seal WM21

Pressure: ≤ 1MPa

Speed: ≤ 10m/s

Temperature: -20℃ ~+150℃

Combined Materials of Rubber bellow mechanical seal WM21

● Stationary Ring (Ceramic/Sic/tc)

● Rotary Ring ( Carbon/Sic/tc)

● Secondary Seal(nbr/Epdm/VITON)

● Spring and Punched Parts(Steel)



If you would like to have a question then get in touch today, we are ready to assist 24/7.
We welcome your cooperation and we will develop with you.

 Factory-direct Connectivity Solutions.
 High quality, Competitive Price.
 Custom-tailored solutions.
 Problem-solving approach.


WenDong specializes in produce mechanical seals and custom mechanical seals solutions. By utilizing our extensive expertise, we can provide a complete solution to your challenge.

Chehe Industrial Park Shiqi Town Ningbo Zhejiang, China


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