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Section A–A · ISPL 2401 conical spring seal

Anatomy of a mechanical seal

One seal, cut open and taken apart. Step through the five views, or play them from the start.

Seal faces1Springs2Secondary seals3Gland plate4Drive collar5
Dwg
IS-2401-XS
Scale
NTS
Sheet
1 / 1
Rev
[placeholder]

01 / 05 · Section

Cut along the shaft

The ISPL 2401 conical spring seal, fitted on a pump shaft and sliced down the middle.

    • Hatched means cut.

      The top half is sliced down the middle so you see inside each part.The top half is sliced down the middle.

    • Dash-dot is your pump.

      The stuffing box belongs to the pump. The seal fits inside it.The seal fits inside its stuffing box.

    • Shaded is outside.

      The bottom half shows each part from outside, as you would see it fitted.The bottom half shows each part fitted.

    1. Seal faces

      One turns with the shaft, one is held still. They run against each other.

    2. Springs

      Pushes the turning face onto the still one, and keeps it there as they wear.

    3. Secondary seals

      O-rings seal the head to the shaft and the seat to the gland plate.

    4. Gland plate

      Bolts to the stuffing box and carries the still seat. A pin stops it turning.

    5. Drive collar

      Locks to the shaft and turns the spring with it.

    1. Fitted 1st

      Drive collar

      Locked to the shaft. Turns the spring.

    2. Fitted 2nd

      Spring

      Conical. Pushes the head towards the seat.

    3. Fitted 3rd

      Rotating head

      Carries the turning face and the shaft O-ring.

    4. Fitted 4th

      Stationary seat

      Sits in the gland plate on its own O-ring.

    5. Fitted 5th

      Gland plate

      Bolts to the stuffing box over the gasket.

  4. Face pair
    [placeholder]
    Face flatness
    [placeholder]
    Spring load, fitted
    [placeholder]

    1. Between the faces

      Closed by the seal faces

    2. Along the shaft, under the head

      Closed by the head O-ring

    3. Behind the stationary seat

      Closed by the seat O-ring

    4. Between gland plate and pump

      Closed by the gasket

    Find the seal for your pumpOr send a photo of the old seal on WhatsAppOr send a photo on WhatsApp

Part by part

What each part does

Every mechanical seal does the same five jobs. Here is each part on its own, in orange.

Fig. 1 · Seal faces in orange · ISPL 2401

Part 1 of 5

Seal faces

Two flat rings do the sealing. One turns with the shaft, the other is held still in the gland plate. They run against each other, and the thin band where they touch keeps the product in.

Rotating face
Turns with the shaft, carried by the rotating head
Stationary seat
Held still in the gland plate, located by a pin
Face materials
[placeholder]
Back to the drawing
Fig. 2 · Springs in orange · ISPL 2401

Part 2 of 5

Springs

The conical spring pushes the rotating face onto the stationary seat, and keeps it there as the faces wear.

Type
One conical spring
Driven by
The drive collar, so it turns with the shaft
Spring material
[placeholder]
Back to the drawing
Fig. 3 · Secondary seals in orange · ISPL 2401

Part 3 of 5

Secondary seals

O-rings close the gaps the faces cannot reach. One seals the rotating head to the shaft. One seals the stationary seat to the gland plate.

Head O-ring
Closes leak path 2, along the shaft
Seat O-ring
Closes leak path 3, behind the seat
Elastomer
[placeholder]
Back to the drawing
Fig. 4 · Gland plate in orange · ISPL 2401

Part 4 of 5

Gland plate

It bolts to the stuffing box of the pump and carries the stationary seat. A pin stops the seat turning. A gasket seals the plate to the pump.

Carries
The stationary seat and its O-ring
Seals to the pump with
A gasket, closing leak path 4
Material
[placeholder]
Back to the drawing
Fig. 5 · Drive collar in orange · ISPL 2401

Part 5 of 5

Drive collar

It locks to the shaft and turns the spring and the rotating head with it.

Fixed to the shaft by
[placeholder]
Turns
The spring and the rotating head
Material
[placeholder]
Back to the drawing

Your pump

Which seal is in your pump?

The drawing shows the ISPL 2401. Your pump may need a different seal. Tell us the pump and the product, or send a photo of the old seal.

Find the seal for your pump