Jiaxing Burgmann Mechanical Seal Co., Ltd. Jiashan King Kong Branch

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H76 Series Pumps Seal

Product Details

Place of Origin: Zhejiang, China

Brand Name: JG

Certification: FDA certificate

Model Number: GNZ

Payment & Shipping Terms

Minimum Order Quantity: 1pcs

Price: USD

Packaging Details: white box

Delivery Time: 3~10DAYS

Payment Terms: T/T,Western Union,MoneyGram

Supply Ability: 1000PCS

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Specifications

Description

Specifications

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                                                                                                                                                                                                                                                                                                                                                                                                      H76 Series mechanical seal, industrial pump seal H76, H76 Series seal replacement
                                                  

Product Name:	H76 Series Pumps Seal	Size:	14 mm – 100 mm (0.55″ – 4.00″)
Application:	Pumps Seal	Metal Parts:	SS304, SS316, SS316L, Hastelloy C
Temperature:	–50 °C To +220 °C	Pressure:	≤ 4.0 MPa (580 psi / 40 bar)

Product Name:	H76 Series Pumps Seal
Size:	14 mm – 100 mm (0.55″ – 4.00″)
Application:	Pumps Seal
Metal Parts:	SS304, SS316, SS316L, Hastelloy C
Temperature:	–50 °C To +220 °C
Pressure:	≤ 4.0 MPa (580 psi / 40 bar)

Description

H76 Series Pumps Seal

The H76 series mechanical seal is a balanced, multi‑spring sealing system specifically designed for high‑pressure, high‑speed, and highly corrosive media. As a core sealing solution for industrial pumps, the H76 series is widely used in centrifugals, mixers, and compressors across the refining, chemical, and fertilizer industries. Its multi‑spring configuration ensures uniform distribution of face loading, delivering exceptional sealing integrity even under complex operating conditions with significant axial runout.

Key Design Features

Multi‑Spring Design: Multiple independent small springs arranged circumferentially provide a more even load distribution compared to single‑spring designs, effectively counteracting centrifugal effects at high rotational speeds.
Balanced Structure: The balanced design allows the seal to operate at elevated pressures (up to 4.0 MPa) while reducing frictional heat generation at the seal faces, significantly extending service life.
Flexible Face Materials: Multiple configurations are available based on media characteristics:
- Carbon vs. Silicon Carbide: Suitable for general clean media.
- SiC vs. SiC / TC vs. TC: For severe services containing solids or abrasive media.
Versatile Secondary Seals: Options include Viton (FKM), PTFE, or Chemraz® (FFKM) high‑performance perfluoroelastomers, ensuring chemical stability in aggressive solvents and high‑temperature environments.

Standards Compliance & Quality Assurance

Standards Compliance: Dimensions and performance fully conform to ISO 3069, DIN 24960, and API 682 specifications.
Integrity Testing: Every H76 seal undergoes 100% static pressure testing and dynamic simulation checks before shipment, guaranteeing zero‑leakage delivery.
Interchangeability: This series serves as a high‑quality drop‑in alternative to EagleBurgmann H76 and equivalent products from other major brands, with no modification to original pump cavity dimensions.

Professional Advantages

Unmatched Stability: For pumps subject to frequent start‑stop cycles, the multi‑spring configuration rapidly compensates for pressure fluctuations, reducing the risk of face damage.
Modular Maintenance: The modular design makes replacement parts extremely easy to change, significantly reducing Mean Time to Repair (MTTR).
Custom Engineering: Beyond standard specifications, we offer tailored seal face coatings for special chemical processes.

Technical Specifications - H76 Series Mechanical Seals

Parameter	Specification
Shaft Diameter Range	14 mm - 100 mm (0.55″ - 4.00″)
Max Pressure	≤ 4.0 MPa (580 psi / 40 bar)
Temperature Range	-50 °C to +220 °C (depending on secondary seal material)
Linear Velocity	≤ 20 m/s (4,000 fpm)
Rotary Face Materials	Silicon Carbide (SSiC/RBSiC), Tungsten Carbide, Carbon
Stationary Seat Materials	Silicon Carbide, Tungsten Carbide, Alumina Ceramic
Secondary Seals	Viton (FKM), EPDM, PTFE, FFKM (Chemraz®/Kalrez®)
Metal Parts	SS304, SS316, SS316L, Hastelloy C
Balance Type	Balanced design
Spring Type	Multiple independent springs (circumferential arrangement)
Direction of Rotation	Independent of rotation direction
Compensability	Excellent axial and radial compensation capability
International Standards	DIN 24960, ISO 3069, ANSI, API 682
Flush Plans	API Plan 11, 21, 32, 52, 53A/B/C

Technical Notes for Engineering

Pressure Handling: Thanks to its balanced design, the PV (Pressure * Velocity) value at the seal faces of the H76 series remains within a safe range even under high‑pressure fluctuations, effectively preventing fluid film flash evaporation.
Spring Protection: The springs are not in direct contact with the pumped medium (depending on configuration). When handling media containing suspended solids or crystallizing tendencies, this significantly reduces the risk of spring clogging or failure.
Surface Finish: Seal face flatness is strictly controlled to within two helium light bands, with a surface roughness of Ra ≤ 0.1 μm, ensuring exceptionally high initial sealing performance.

Technical FAQ: H76 Series Mechanical Seals

Q1: Why is the H76 series classified as a "balanced" seal, and what does this mean for high‑pressure service?

A: The H76 features a balanced hydraulic design. The principle is to reduce the net hydraulic force acting on the seal faces so that they are subject only to a portion of the fluid pressure. Significance: This greatly reduces frictional heat generation and wear at the seal faces. Even at pressures up to 4.0 MPa (580 psi), the fluid film between the faces remains stable and does not rupture due to excessive pressure, thereby extending service life under high‑pressure conditions.

Q2: What advantages does the H76's multi‑spring design offer over a large‑single‑spring design?

A: Multi‑spring design provides superior load balancing.

Pressure distribution: Multiple small springs evenly arranged around the circumference ensure that the closing force between the rotary and stationary faces is uniform across 360°, avoiding angular misalignment wear.
High‑speed stability: At high rotational speeds (≤ 20 m/s), small springs are far less affected by centrifugal force than a single large spring, offering faster dynamic response and real‑time compensation for minor shaft runout.

Q3: Does the H76 series support API 682 flush plans? What are common configurations?

A: Yes, the H76 series is fully API‑compliant and is typically used with flush plans to optimize the operating environment:

Plan 11 (discharge recirculation): For clean media, uses pump discharge pressure to flush the seal faces and remove heat.
Plan 32 (external flush): For media containing solids or corrosive components, introduces clean external fluid to protect the seal.
Plan 52/53 (barrier fluid systems): For hazardous media, a double seal arrangement (tandem or double) ensures that no dangerous fluid escapes.

Q4: How should secondary seals be configured for the H76 seal when handling highly corrosive chemical media?

A: Secondary seals are critical for chemical compatibility. Based on professional standards, we recommend:

General service / light hydrocarbons: Viton (FKM).
Strong acids / strong alkalis: PTFE or encapsulated O‑rings.
Extreme chemical environments / high temperatures: Chemraz® or Kalrez® (FFKM), offering superior chemical attack resistance.

Q5: What are the most critical installation precautions for the H76 seal?

Installation compression: The working length must be set exactly as specified on the technical drawing. Under‑compression causes leakage; over‑compression leads to excessive wear and premature failure.
Face cleanliness: Seal faces (carbide or carbon) are extremely precise. Do not touch them with bare hands before installation. Clean with anhydrous alcohol and apply a light lubricating film.
Shaft precision: Ensure shaft radial runout is less than 0.05 mm and the shaft surface is free of burrs to avoid damaging the O‑ring during assembly.

Q6: Which international brand models can the H76 series replace?

A: The H76 represents a standardized industrial design and serves as a direct drop‑in alternative for:

EagleBurgmann: H76 series (fully interchangeable).
John Crane: Compatible with certain balanced multi‑spring series (e.g., variants of Type 8).
Flowserve: Corresponding standard‑dimension multi‑spring balanced seals.

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