1 Rubber Bellow Mechanical Seal

The Model 1 family is available in fractional-inch sizes from 5/8 in. to 3 in., with dimensional references for d, D3, D7, L3 and L4. For replacement projects, these dimensions are more useful than the model name alone because the correct shaft size must also match the available radial and axial installation space.

This makes the Model 1 especially practical for replacement projects. Distributors and maintenance teams can identify the nearest size, compare D3/D7 and L3/L4 with the old seal, then confirm the working medium and operating conditions before production.

Technical Specifications

Design & Installation Details

The Model 1 uses an elastomer bellow rotating assembly, coil spring and stationary seat. Key installation dimensions include D3, D7, L3 and L4, together with a 1.5 × 45° chamfer reference. Confirming these dimensions before ordering helps reduce replacement mismatch and installation rework.

Material Codes: Use the Medium to Drive the Choice

Material options are identified by selection codes. Use the required code where it is already known, or provide the working medium and operating conditions so Qixing can review a suitable material combination.

• Stationary ring: V1 / Q1 / Q2 / U2 / U1
• Rotary ring: B / A / U2 / Q2 / Q1 / U1
• Secondary seal: P / E / V
• Spring and metal parts: F / G

For quotation, buyers who already know the required code can send it directly. If the code is unknown, Qixing can review the fluid and operating conditions before the final material combination is confirmed.

Application Notes

The 1 Rubber Bellow Mechanical Seal is suitable for clean water, sewage water, oil and other moderately corrosive fluids. Actual compatibility should still be checked against solids content, additives, concentration and temperature because these conditions can vary significantly between applications.

For applications outside the listed media—or near the stated temperature or pressure limits—send the actual medium and duty conditions with the RFQ so the material selection can be checked before production.

Replacement Matching: Measure Before the Old Seal Is Discarded

• Record the shaft diameter d and the fractional-inch size if known.
• Measure D3 and D7 to check the radial installation envelope.
• Measure L3 and L4 to check the axial installation space.
• Photograph the complete rotating assembly and the stationary seat separately.
• Record the working medium, temperature, pressure and shaft speed.
• Send any visible model marking or material code together with the measurements.

How Qixing Handles an RFQ for Model 1

Why Choose Qixing

Qixing, the mechanical seal brand of Ningbo Yade Fluid Connector Co.,Ltd, manufactures and supplies mechanical seals for industrial buyers. For the Model 1 series, our factory can work from size references, dimensions, old samples or drawings and combine that information with the actual operating conditions before quotation.

This is especially useful for replacement projects where the old model marking is incomplete. Qixing can use dimensional and application information to support customized matching without claiming universal interchangeability.

Frequently Asked Questions

What sizes are listed for the 1 Rubber Bellow Mechanical Seal?

Available sizes run from 5/8 in. to 3 in., corresponding to shaft diameters from 15.875 mm to 76.2 mm.

What are the operating limits of the Model 1 seal?

The operating range is -20°C to +120°C, with pressure up to 1.4 MPa and sliding speed up to 15 m/s.

What media are listed for Model 1?

Clean water, sewage water, oil and other moderately corrosive fluids.

Which dimensions should I check for a replacement?

Key replacement dimensions include d, D3, D7, L3 and L4. Compare these values with the existing installation before ordering.

Can I order using only the shaft diameter?

The shaft diameter identifies the size range, but D3, D7, L3 and L4 should also be checked for a replacement project.

What material options are available?

Available material selections are specified by codes for the stationary ring, rotary ring, secondary seal, spring and metal parts. Contact Qixing if you need help confirming the appropriate combination.

Can Qixing manufacture a replacement from a sample?

Qixing can review a sample, drawing, photos and dimensions together with the operating conditions for customized matching.

Is this seal suitable for any corrosive chemical?

For corrosive service, provide the actual chemical and operating conditions so the material combination can be reviewed before production.

What should I include in an RFQ?

Send the shaft size, D3/D7/L3/L4 dimensions, medium, temperature, pressure, speed and any old-seal photos or model markings.

Does Qixing support OEM orders?

Yes. Qixing can review OEM and replacement requirements based on dimensions, samples, drawings and operating data.

Model 1 Dimension Table

Dimensions are shown in millimeters. Model names below use the Qixing-facing Model 1 designation.