H74D Multi Spring Mechanical Seal

The product specifications list operating temperatures from -20°C to +180°C, pressure up to 2.5 MPa and sliding speed up to 15 m/s. Clean water, sewage water, oil and other moderately corrosive fluids are listed as application media. G92 is the standard stationary seat, with G9, G4 and G6 listed as alternatives.

Key Features

• H74D multi spring mechanical seal with O-ring secondary sealing.
• Double mechanical seal arrangement shown in the product specifications drawing.
• Available shaft size range: 14-100 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.
• Factory customization and product matching can be discussed according to shaft size, medium and operating conditions.

Technical Specifications

Applications

H74D Multi Spring Mechanical Seal can be considered for equipment handling:

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

For media outside these listed categories, material compatibility and operating conditions should be confirmed before selection.

Material Selection

The product specifications provide material choices as codes. To avoid assigning unsupported material names, this page keeps those codes exactly as listed:

• 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

H74D Design and Selection Considerations

The H74D belongs to the product specifications's O-ring mechanical series and is shown with a double mechanical seal arrangement. For selection, the model should be checked together with shaft diameter, installation dimensions, seat arrangement, material-code combination and actual operating conditions.

The H74D size range starts at 14 mm and extends to 100 mm. Dimensions such as d0, D3, D6, D7, d1, L6, L3, L4 and L9 vary by size. A replacement order should therefore not rely on the H74D designation alone; the shaft size and installation dimensions should also be confirmed against the existing seal or equipment drawing.

The product specifications list -20°C to +180°C, pressure up to 2.5 MPa and sliding speed up to 15 m/s. Actual suitability can also depend on material combination, medium properties, lubrication and equipment conditions. Applications near the listed limits should be reviewed with complete operating data.

G92 is listed as the standard seat, while G9, G4 and G6 are alternatives. The technical specifications does not provide a detailed performance comparison between these seat options, so selection should be based on the required installation geometry and confirmed application details.

Replacement and Procurement Matching

For replacement purchasing, provide the existing seal model, shaft diameter, available installation dimensions, working medium, temperature, pressure, speed, seat requirement and any known material codes. Clear photos of the complete seal and stationary seat can also help Qixing compare the requested size with the existing assembly.

Qixing manufactures and supplies mechanical seals and supports customized matching when a standard configuration does not fully meet the required installation. Dimensional confirmation is important before production or quotation, especially when the original seal identification is incomplete.

Application Selection Notes

The product specifications list clean water, sewage water, oil and other moderately corrosive fluids. These media can represent different operating conditions, so suspended solids, additives, concentration, temperature and other fluid details should be provided when they may affect material selection.

For media outside the product specifications description, Qixing should review the full operating conditions before confirming a configuration. This keeps the selection process technically grounded without making unsupported universal-use claims.

How to Order / Request a Quote

For faster model confirmation and factory quotation, send:

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

Why Choose Qixing as Your H74D Manufacturer

Qixing, the mechanical seal brand of Ningbo Yade Fluid Connector Co.,Ltd, manufactures and supplies mechanical seals for industrial customers. For H74D inquiries, our factory can review shaft size, dimensions, medium and operating conditions to support product matching, material-code selection and customized requirements.

For replacement projects, Qixing can compare the model reference with dimensional data and photos before quotation. This factory-direct approach helps buyers communicate technical requirements clearly while keeping the requested configuration tied to actual operating and installation conditions.

FAQ

What sizes are available for the H74D Multi Spring Mechanical Seal?

The product specifications list H74D shaft sizes from 14 mm to 100 mm.

What are the listed operating limits of the H74D?

The product specifications list temperatures from -20°C to +180°C, pressure up to 2.5 MPa and sliding speed up to 15 m/s.

What fluids can the H74D be used with?

The technical specifications lists clean water, sewage water, oil and other moderately corrosive fluids.

Is the H74D a double mechanical seal?

the product specifications drawing shows the H74D with a double mechanical seal arrangement in the O-ring mechanical series.

Which seat types are available for H74D?

G92 is the standard seat, while G9, G4 and G6 are available as alternative seat options.

How do I choose the correct H74D size?

Start with the shaft diameter and then confirm the listed d0, D3, D6, D7, d1, L6, L3, L4 and L9 dimensions together with the operating conditions.

Can Qixing customize the H74D mechanical seal?

Qixing is a manufacturer and factory supplier. Customized requirements can be reviewed according to the required dimensions, materials, operating conditions and order details.

What information should I send for a quotation?

Send shaft size, medium, temperature, pressure, speed, seat requirement, material requirements, quantity and, for replacement, the existing model, dimensions and photos.

Can the H74D be used for strongly corrosive fluids?

the product specifications only states other moderately corrosive fluids. Stronger corrosive service requires detailed medium and material compatibility confirmation before selection.

Is the H74D model number alone enough for a replacement order?

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

H74D Dimension Table

Dimensions are shown in millimeters. Model names below use the Qixing-facing H74D designation.