Pusher Type Mechanical Seals

Compressors, Mixers and Rotating Equipment
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Pusher seals utilize a dynamic secondary seal which moves axially with the major seal face. Defined by the secondary seal type, either o-ring or polymer wedge.

Consult with one of our knowledgeable technical sales representative with your requirements to assure the best bellows seal to suit your pump unit and application.

NES 3b Mechanical Pump Seal Equivalent Burgmann H12N

NES 3B

NES 3U Mechanical Pump Seal Equal to Burgmann M3 M32 M37

NES 3U

NES 4 Mechanical Pump Seal Comparable to Flexibox RO

NES 4

NES 6b Mechanical Pump Seal Equivalent John Crane 8B 1

NES 6B

NES 6u Mechanical Pump Seal Equal to John Crane 8-1

NES 6U

NES 7b Mechanical Pump Seal Equivalent John Crane 9B

NES 7B

NES 7U Mechanical Pump Seal Comparable John Crane 9

NES 7u

NES 8 Mechanical Pump Seal Equal to AES T01 T02

NES 8

NES 8b2 Mechanical Pump Seal Equivalent John John Crane 8B2

NES 8B2

NES 9b Mechanical Pump Seal Similar to Burgmann H7N

NES 9B

NES 9U Mechanical Pump Seal Equals to Burgmann M7N

NES 9u

NES 10t Mechanical Pump Seal Equivalent John Crane 10T 10R

NES 10T

NES 11b Mechanical Pump Seal Comparable to Sealol 523 524

NES 11B

NES 11u Mechanical Pump Seal Equivalent Sealol 527 528

NES 11U

NES 12 Mechanical Pump Seal Equal to AES T03

NES 12

NES 13 Mechanical Pump Seal Equivalent AES T04

NES 13

NES 15 Mechanical Pump Seal Equivalent Durametallic RO

NES 15

NES 20u-d Mechanical Pump Seal Equal to Burgmann M74D

NES 20U-D

NES 21 Mechanical Pump Seal Comparable Burgmann HJ92

NES 21

NES 22 Mechanical Pump Seal Equivalent Eagle H1

NES 22

NES 23 Mechanical Pump Seal Equal to Eagle L1

NES 23

NES 24 Mechanical Pump Seal Comparable to John Crane R33

NES 24

NES 26 Mechanical Pump Seal Similar to Chesterton 891

NES 26

NES 28 Mechanical Pump Seal Equivalent John Crane 32 Flowserve VRC Burgmann Seccomix

NES 28

A pusher-type seal consists of a primary sealing ring assembled with an 'O' ring and springs which force the sealing liquid across the face and keep it from leaking to the ID side of the seal.

The dynamic O-ring is designed to be pushed axially along the shaft. The surface underneath the dynamic Oring must therefore be very smooth to allow for axial movement. If solids are abundant in the sealing fluid, they can build up on the o-ring and prevent this axial movement.

Pusher types seals are less expensive and are readily available in a wide range of sizes and designs. The only disadvantage being a tendency to hang up and fretting of the shaft.