M74D Multi Spring Mechanical Seal

The product specifications list clean water, sewage water, oil and other moderately corrosive fluids as application media. The standard stationary seat is G92, while G9, G4 and G6 are listed as alternative seat options.

Key Features

• M74D multi spring mechanical seal with an O-ring secondary sealing design.
• Double mechanical seal arrangement as shown in the product specifications drawing.
• Available shaft size range: 18-100 mm.
• Operating temperature range: -20°C to +180°C.
• Maximum listed operating pressure: 2.5 MPa.
• Maximum listed sliding speed: 15 m/s.
• Standard seat type: G92; alternative seat types: G9, G4 and G6.
• Multiple material-code options are listed for stationary rings, rotary rings, secondary seals, springs and metal parts.
• Listed for clean water, sewage water, oil and other moderately corrosive fluids.

Technical Specifications

Applications

M74D Multi Spring Mechanical Seal can be considered for equipment handling:

• Clean water
• Sewage water
• Oil
• Other moderately corrosive fluids

For fluids outside these listed categories, confirm face and elastomer compatibility before selection.

Material Selection

Material options are identified by selection codes. Available codes include:

• Stationary ring: V1 / Q1 / Q2 / U2 / B / A
• Rotary ring: B / A / Q1 / Q2 / U2
• Secondary seal: P / E / V / M1 / M2
• Spring and metal parts: F / G / M

How to Select the Right M74D Seal

For faster model confirmation and quotation, provide the following information with your inquiry:

• Required shaft diameter (d).
• Working medium / fluid.
• Operating temperature.
• Operating pressure.
• Rotational or sliding speed.
• Required material code combination, if already specified.
• Required seat type (G92, G9, G4 or G6), if known.
• Existing seal model, dimensions or clear photos for replacement inquiries.

M74D Design and Selection Considerations

The product is part of the M74D in the O-ring mechanical seal series and shows a double mechanical seal arrangement. For selection, the model designation should be checked together with the shaft diameter, installation dimensions, seat arrangement, material-code combination and real operating conditions.

The M74D size table covers shaft diameters from 18 mm to 100 mm. Several installation dimensions change as the shaft size increases, so a replacement order should not be based only on the M74D name. Confirm the shaft diameter and compare the listed D6, D7, D3, d1, L3, L4 and L9 dimensions against the existing installation.

The product specifications list an operating envelope of -20°C to +180°C, pressure up to 2.5 MPa and sliding speed up to 15 m/s. The practical limit of a selected configuration can also depend on the actual material combination, fluid properties and equipment conditions. Applications close to the listed limits should therefore be reviewed with complete operating data.

G92 is listed as the standard seat, while G9, G4 and G6 are listed as alternatives. the product specifications page does not provide a detailed performance comparison among these seat options, so the correct choice should be confirmed from the existing installation and dimensional requirements rather than inferred from the seat code alone.

Replacement and Procurement Matching

For replacement purchasing, the M74D designation is a useful starting point, but dimensional confirmation is important. To reduce back-and-forth during quotation, provide the existing seal reference, shaft size, available installation dimensions, working medium, temperature, pressure, speed, seat requirement and any known material codes.

If the original seal marking is worn or unclear, clear photos of the complete seal, stationary seat and dimensional measurements can be used as supporting information. This helps determine whether the requested size matches the existing assembly without claiming universal interchangeability.

Application Selection Notes

The product specifications list clean water, sewage water, oil and other moderately corrosive fluids. These categories can still represent very different operating conditions. For sewage containing suspended particles, oils with additives, or corrosive media of uncertain composition, provide the actual medium details before confirming the material-code combination.

For media outside the product specifications description, Qixing should review the required conditions before presenting a configuration. For media outside this range, Qixing reviews the operating conditions and material compatibility before confirming a configuration.

Why Choose Qixing as Your M74D Manufacturer

As an M74D Multi Spring Mechanical Seal manufacturer and factory, Qixing can support product matching and customized selection based on your shaft size, installation dimensions, working medium and operating data. For replacement inquiries, our factory can review dimensional information and photos together with the model reference so the quotation is based on the actual selection parameters. This helps buyers communicate directly with a manufacturer while avoiding unsupported interchangeability claims.

FAQ 

What sizes are available for the M74D Multi Spring Mechanical Seal?

The product specifications list M74D sizes from 18 mm to 100 mm shaft diameter.

What are the operating limits of the M74D?

The listed operating range is -20°C to +180°C, pressure up to 2.5 MPa and sliding speed up to 15 m/s.

What fluids can the M74D be used with?

The product specifications list clean water, sewage water, oil and other moderately corrosive fluids.

Which seat types are available?

G92 is listed as the standard seat. G9, G4 and G6 are listed as alternative seats.

Is the M74D a double mechanical seal?

the product specifications drawing shows the M74D as a double mechanical seal arrangement within the O-ring mechanical series.

How do I choose the correct M74D size?

Start with the shaft diameter, then confirm the listed D6, D7, D3, d1, L3, L4 and L9 dimensions together with the operating conditions.

Can the M74D be used for strongly corrosive fluids?

the product specifications only states other moderately corrosive fluids. Stronger corrosive service requires material compatibility and full operating-condition confirmation before selection.

What information should I send for an M74D quotation?

Send the shaft diameter, working medium, temperature, pressure, speed, seat requirement and any known material codes. For replacement, include the existing model, dimensions and photos.

What is the difference between G92, G9, G4 and G6 seats?

The product specifications identify G92 as standard and G9, G4 and G6 as alternatives, but it does not provide a detailed performance comparison. Selection should therefore be based on installation and dimensional requirements.

Is the model number alone enough to order a replacement M74D seal?

Not always. A more reliable match should include shaft size, installation dimensions, seat arrangement and operating conditions in addition to the model designation.

M74D Dimension Table

Dimensions are shown in millimeters. Model names below use the Qixing-facing M74D designation.