2N Single Spring Mechanical Seal

The 2N Single Spring Mechanical Seal is designed around a simple single-spring arrangement with O-ring secondary sealing. Its compact construction makes it suitable for pump applications where installation space, shaft size and seat dimensions need to be checked carefully during replacement.

Unlike multi-spring seals, the 2N uses one main spring to maintain face contact. For maintenance buyers, this gives the product a straightforward structure that is easy to identify from an existing seal sample. For OEM projects, the 2N can be selected by shaft diameter, stationary-seat arrangement, material combination and actual operating conditions.

The available working range covers clean water, sewage water, oil and other moderately corrosive fluids. Because these media can vary considerably in composition and temperature, Qixing recommends confirming the actual medium before the final material combination is selected.

Key Features

• Single-spring mechanical seal with O-ring secondary sealing.
• Compact construction for industrial pump and replacement applications.
• Available for shaft sizes from 10 mm to 38 mm.
• Operating temperature range from -20°C to +180°C.
• Maximum operating pressure up to 1 MPa.
• Maximum sliding speed up to 15 m/s.
• Standard stationary seat: G9.
• Alternative stationary seats: G6 and G4.
• Multiple material-code combinations for stationary ring, rotary ring, secondary seal and metal parts.
• Suitable for clean water, sewage water, oil and other moderately corrosive fluids.

Technical Specifications

Single-Spring Design and Seat Options

The 2N uses a single spring rather than a group of small springs. During operation, the spring provides the axial force needed to keep the sealing faces in contact while the O-ring arrangement provides secondary sealing. This structure is commonly selected when buyers need a compact seal with a clearly defined spring and stationary-seat arrangement.

G9 is the standard stationary seat for the 2N. G6 and G4 can be supplied as alternative seat options. The correct seat should be selected according to the pump installation and existing dimensions rather than by model name alone. For replacement projects, sending a photo of the old stationary seat together with its main dimensions can significantly reduce matching errors.

Material Selection

Material selection should be based on the actual medium, temperature and operating conditions. The 2N is available with several material-code combinations:

• Stationary ring: V1 / Q2 / Q1 / B
• Rotary ring: B / Q1 / Q2
• Secondary seal: P / E / V
• Spring and metal parts: F / G

If the existing seal already has a confirmed material code, provide that code with the inquiry. If the material is unknown, provide the fluid name, concentration where relevant, operating temperature and pressure so Qixing can review the requested configuration.

Applications

The 2N Single Spring Mechanical Seal can be used in equipment handling clean water, sewage water, oil and other moderately corrosive fluids. Typical selection situations include industrial pump maintenance, replacement of worn mechanical seals and new pump assembly projects.

Application suitability should be checked against the real duty conditions. Sewage may contain particles, oils may contain additives, and moderately corrosive fluids can vary in concentration. These differences can affect the choice of sealing faces and secondary seal material.

How to Select the Correct 2N Seal

• Confirm the shaft diameter first. The 2N size range is 10-38 mm.
• Check the stationary-seat style and determine whether G9, G6 or G4 is required.
• Measure the old seal and available installation space when the product is used as a replacement.
• Provide the working medium and any relevant concentration or contamination information.
• Provide normal and maximum operating temperature.
• Provide operating pressure and shaft speed.
• Confirm the required material codes when they are already known.
• For replacement orders, send clear photos, drawings or an old sample where possible.

Replacement Matching

A replacement 2N should not be selected from the model name alone. Two seals can look similar but use different seat dimensions, axial lengths or material combinations. Before production, compare the shaft diameter, stationary-seat arrangement and main installation dimensions with the existing seal.

If the old model marking is incomplete, Qixing can review the available dimensions, photos or sample together with the operating conditions. This is often more reliable than trying to identify a replacement from appearance alone.

Why Choose Qixing

Qixing is the mechanical seal brand of Ningbo Yade Fluid Connector Co., Ltd. As a mechanical seal manufacturer, we support industrial buyers with standard 2N sizes as well as OEM and replacement matching based on samples, drawings, dimensions and actual working conditions.

For procurement teams, the focus is not simply on supplying a model number. The shaft size, stationary seat, material combination and operating duty should be confirmed together so the supplied seal matches the real installation requirements.

Frequently Asked Questions

What is an 2N Single Spring Mechanical Seal?

The 2N is an O-ring mechanical seal using a single-spring arrangement. It is designed for pump and replacement applications requiring a compact sealing structure.

What shaft sizes are available for the 2N?

The available shaft size range is 10 mm to 38 mm.

What are the operating limits of the 2N?

The operating temperature range is -20°C to +180°C, with pressure up to 1 MPa and sliding speed up to 15 m/s.

Which stationary seat is standard for the 2N?

G9 is the standard stationary seat. G6 and G4 are available as alternatives.

What fluids can the 2N be used with?

It is suitable for clean water, sewage water, oil and other moderately corrosive fluids, subject to correct material selection.

How should I choose between G9, G6 and G4?

The seat option should be matched to the pump installation and existing seat dimensions. For replacement projects, provide a photo or drawing of the old seat.

What information is needed for an 2N quotation?

Provide shaft diameter, seat requirement, working medium, temperature, pressure, speed and any available dimensions or old-seal photos.

Can Qixing supply an 2N replacement from a sample?

Yes. Qixing can review samples, drawings, photos and measured dimensions for replacement matching.

Can the material combination be customized?

Material combinations can be reviewed according to the handled medium and operating conditions.

Is the shaft diameter enough to order the correct 2N seal?

No. Shaft diameter is the starting point, but stationary-seat arrangement, installation dimensions, material requirements and operating conditions should also be confirmed.