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Grundfos Seal JMK

Product Details

Place of Origin: Zhejiang, China

Brand Name: JG

Certification: FDA certificate

Model Number: JMK

Payment & Shipping Terms

Minimum Order Quantity: 1pcs

Packaging Details: white box

Delivery Time: in stock

Payment Terms: T/T,Western Union,MoneyGram

Supply Ability: 1000pcs

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Specifications

Description

Specifications

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                                                                                                                                                                                                                                                                                                                                                                                                      Grundfos JMK mechanical seal, Grundfos seal replacement part, mechanical seal for Grundfos pumps
                                                  

Product Name:	Grundfos Seal JMK	Pressure:	≤0.6MPa
Use:	Pump Mechanical Seal	Temperature:	-20~+150℃
Stationary Ring:	Carbon/SIC/TC	Retainer:	SUS304/SUS316

Product Name:	Grundfos Seal JMK
Pressure:	≤0.6MPa
Use:	Pump Mechanical Seal
Temperature:	-20~+150℃
Stationary Ring:	Carbon/SIC/TC
Retainer:	SUS304/SUS316

Description

Grundfos Seal JMK

In the operation of vertical multistage pumps, the mechanical seal is the critical determinant of the Mean Time Between Failure (MTBF). The JMK Series is a specialized cartridge-mounted sealing unit engineered specifically for Grundfos CR, CRI, and CRN pumps. It eliminates the inherent risks associated with traditional component seals, such as improper installation and sensitivity to human error.

By integrating a balanced seal architecture within a stainless steel sleeve, the JMK series withstands instantaneous pressure spikes up to 25 bar. Its "Plug-and-Play" design reduces maintenance downtime by over 75%. Our JMK equivalent seals strictly adhere to OEM hydrodynamic profiles, offering a professional-grade alternative for water treatment, boiler feed, and ultrafiltration systems.

Technical Specifications

Parameter	Specifications	Application Guidance
Shaft Diameters	12mm, 14mm, 16mm, 22mm	Covers CR1 through CR90 series
Seal Face Materials	SiC / Tungsten Carbide (TC)	High hardness, erosion-resistant
Max Operating Pressure	≤ 25 bar (362 psi)	Ideal for high-rise booster & high-pressure pumps
Temperature Range	-30°C to +120°C (Std.)	Custom high-temp versions up to +180°C
Secondary Seals (O-Rings)	EPDM (HQQE) / Viton (HQQV)	Optimized for chemical/thermal resistance
Hardware Components	AISI 304 / 316 Stainless Steel	Superior corrosion & oxidation resistance

Technical Advantages

Hydraulically Balanced Design: Unlike standard non-balanced seals (e.g., Type 1), the JMK utilizes a balanced geometry. This minimizes face loading in closed-loop systems with high-pressure fluctuations, preventing "face-popping" or fluid film flashing that causes premature wear.
Precision Pre-Set Compression: The seal is factory-set to the exact spring tension requirements. This eliminates the need for manual measurements or scribing the shaft, preventing the common failure mode of early wear caused by 1-2mm installation offsets.
HQQE/HQQV Code Standardization: We strictly follow the industry-standard material coding:
- HQQE: Silicon Carbide faces with EPDM elastomers--the standard for potable water and HVAC systems below 120°C.
- HQQV: Silicon Carbide faces with Viton (FKM)--engineered for oils, lubricants, and specific chemical catalysts.
Anti-Clogging Architecture: The spring mechanism is positioned away from the process fluid or protected by a robust shroud, preventing "spring hang-up" when handling process water with trace particulates or crystallization.

Expert Q&A

Q: Why does my Grundfos pump leak shortly after replacing it with a standard component seal?

A: This is usually due to two factors: incorrect spring compression during installation or hydraulic overloading. Because CR pumps operate at high pressures, non-balanced seals suffer from excessive face pressure above 10 bar. The JMK's balanced design maintains an optimal liquid film thickness, ensuring longevity under high load.

Q: Can the JMK seal handle media with crystalline particulates?

A: For fluids with fine crystals, we recommend a TC/TC (Tungsten Carbide vs. Tungsten Carbide) configuration. While the initial cost is higher, TC provides the fracture toughness required to prevent face "chipping" during the high-torque start-up phase.

Q: What is the most critical step during the installation of a cartridge seal?

A: You must tighten the drive screws to the shaft before removing the assembly spacers (set plates). This ensures the rotary and stationary components maintain their precision-set axial alignment. Removing the plates prematurely can cause the seal to shift, leading to immediate failure upon startup.

Q: How is the "Reliability" (Trust) of your products verified?

A: Every JMK unit undergoes a 100% static air-decay test before packaging. Our material components are fully traceable, ensuring that all elastomers and alloys meet international fluid-handling certifications for industrial safety.

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