• Resilient Mounting: The ceramic stationary seat is mounted in a robust rubber cup to absorb the vibration and shock loads common in portable submersible pumps.

• Compact Profile: Designed to fit the tight axial space inside compact submersible motor housings.

MIAOYU provides direct John crane type 1 mechanical seal replacements engineered for full OEM interchangeability. This industry-standard single-spring elastomer bellows seal is designed for general service in pumps, mixers, and agitators handling water, oils, and mild chemicals. 

Looking for a John Crane Type 2 seal replacement? Our MIAOYU T2 series is a 100% dimensionally interchangeable single spring elastomer bellows seals (also called rubber bellow mechanical seals), designed as a direct drop-in equivalent to the original John Crane Type 2 unbalanced single-spring non-pusher seal. Featuring a compact working length for shallow stuffing boxes, self-aligning rubber (elastomer) bellow and non-clogging outside-mounted coil spring – ideal for water pumps, HVAC circulators, wastewater and light process pumps. As an ISO 9001 John Crane Type 2 seal OEM replacement manufacturer in China, we offer Single Spring mechanical seals in metric & inch sizes with factory direct pricing for distributors and MRO buyers.

The John Crane Type 6 mechanical seal is a compact, unitized single-spring seal designed as a direct aftermarket equivalent for the industry-standard John Crane Type 6/6A series. Engineered for small centrifugal pumps, jet pumps, and light industrial applications, this replacement John Crane type 6 mechanical seal features a full-convolution elastomer bellows (typically NBR or Viton) that compensates for shaft misalignment and end-play. With standard face materials like carbon vs. ceramic (or upgraded SiC/TC for abrasives) and stainless steel springs, elastomer bellow mechanical seal is ideal for handling clean water, mild chemicals, and non-abrasive fluids within standard pressure and temperature ranges.

The John Crane 58B/58U/59B/59U mechanical seal is a precision-engineered multi-spring DIN standard seal designed as a direct aftermarket equivalent for the industry-standard John Crane Type 58/59 series. This versatile replacement line covers both unbalanced (58U/59U) and balanced (58B/59B) configurations, adhering to DIN 24960/EN 12756standards for exact dimensional interchangeability. Engineered for chemical process pumps, refineries, and industrial applications, it features multiple spring designs for uniform face loading and is available with either elastomer O-rings (Type 58) for general service or PTFE wedge secondary seals (Type 59) for aggressive chemicals and high temperatures. Standard face materials include carbon vs. silicon carbide (SiC) or tungsten carbide (TC), housed in stainless steel (SS304/316), making it ideal for sealing water, oils, solvents, and a wide range of corrosive media.

MIAOYU offers direct replacement John crane type 1 mechanical seals for general service pumps. This standard single-spring design provides reliable sealing for water, oils, and mildly corrosive fluids. Pusher mechanical seals are available in a wide range of shaft sizes with various face material options (SiC, TC, Carbon) to match OEM dimensions and performance, ensuring easy installation and cost-effective maintenance.

The John Crane 8B1 & 8B2 mechanical seal is a precision-engineered multi-spring pusher-type seal designed as a direct aftermarket equivalent for the industry-standard John Crane Type 8 series. This range includes the 8B1 (general heavy-duty balanced seal) and 8B2 (specialized for high-integrity hydrocarbon/chemical service) configurations. Engineered for imperial shaft sizes (0.5\" to 6\"), it features a multi-spring design for uniform face loading and is available in balanced constructions to handle high pressures. 

• Dry-Run Faces (Optional): John crane type 21 mechanical seal can be fitted with specialized dry-running Carbon faces for gas-phase reactions where liquid lubrication is prohibited.

• Non-Metallic Options: For glass-lined reactors, we offer ceramic-coated or PTFE-sleeved metal parts to prevent metal contamination.

The John Crane Type 9 mechanical seal is a direct aftermarket equivalent to the AES M01 and John Crane Type 9 series. It is a multi-spring, unbalanced, pusher-type seal specifically engineered for aggressive chemical services. Its defining feature is the PTFE wedge secondary seal, which provides near-universal chemical resistance to strong acids, caustics, and solvents where traditional elastomers would fail. 

• Reversible Faces: Some models feature reversible seal faces, effectively doubling the life of the wearing components (check specific model).

• A-Drive System: Utilizes a robust drive mechanism that distributes torque evenly, preventing face distortion.

The John Crane 2100 elastomer bellows shaft seal is a heavy-duty, unitized cartridge seal designed for demanding industrial centrifugal and process pumps. Engineered as a direct OEM replacement, John Crane 2100 mechanical seal features a robust, full-convolution elastomer bellows (NBR or Viton) that eliminates the need for dynamic O-rings, preventing hang-up in sticky or viscous media. This unbalanced seal is known for its simplified installation, excellent vibration damping, and reliable performance in water, oils, chemicals, and light slurries. With standard face materials like Carbon vs. Silicon Carbide (SiC) and a durable metal construction, the John crane shaft seal is a versatile solution for general industrial service, wastewater, and cooling tower applications.

• Precision Wedge: Our Type 9 replacement features a CNC-machined PTFE wedge with optimized angles for reduced friction and better sealing reliability.

• Balanced Options: Available in Type 8B1/9B versions for high-pressure applications (balanced step).

• Stepped Shaft Requirement: Designed to fit stepped shafts to achieve hydraulic balance, reducing heat generation and face wear.

• Anti-Extrusion: Features tight-tolerance backup rings to prevent the PTFE wedge from extruding under high pressure.

Type: Double cartridge mechanical seal

Replace Brand: John Crane mechanical seal

Specification:  type 6/type 8/type 9/type 21/109b/2100/5610/8b1/8b2

Temperature: high temperature mechanical seal

Balance: Unbalanced

Type: Multi-Spring

Accreditation: ISO, SGS, UL, ROHS

Service: OEM/ODM

Origin: China

• Lift-Off Technology: Laser-etched grooves create aerodynamic lift, separating the faces at low speeds.

• Clean Operation: Eliminates the need for messy oil barrier systems, ideal for high-purity pharmaceutical or semiconductor applications.

• Low Friction PTFE: Reduces power consumption and heat generation.

• Composite Design: Uses a PTFE sealing lip or wedge integrated into the compact Type 6 metal shell.

• Flexible Bellow: Compensates for significant shaft end-play and misalignment.

• Friction Drive: The bellow grips the shaft to drive the face, requiring no set screws.

PTFE wedge mechanical seals are purpose-built OEM-interchangeable replacements for AES T01, T03, T04, John Crane Type 9, Flowserve RO and similar chemical-service wedge seal configurations. Each ptfe mechanical seal is available in balanced and unbalanced variants, single or tandem (double) arrangements, with carbon graphite, silicon carbide or tungsten carbide face pairs depending on fluid chemistry and abrasivity.

MIAOYU offers Model 58B balanced and unbalanced PTFE wedge seals engineered for extreme chemical resistance in corrosive, high-temperature, and high-pressure applications. The unbalanced design reliably serves general chemical duty up to 12 bar, while the balanced version features a stepped sleeve and anti-rotation lugs to handle pressures up to 35 bar with reduced face heat generation and lower wear. Both variants utilize a chemically inert PTFE wedge as the primary sealing element, operating across -30°C to 200°C, speeds up to 25 m/s, and pressures up to 2.5 MPa. 

Ideal for reactor agitators, chemical pumps, solvent handling, and food processing equipment where reliability under aggressive media is critical.

The high pressure PTFE wedge mechanical seal for mixers, specifically engineered for top-entry agitators, reactor shafts and mixing vessels operating under demanding conditions. This high pressure mechanical seal features a balanced design rated to 40 bar vessel pressure, with an extended PTFE wedge that tracks radial shaft runout up to 0.5 mm, ensuring reliable sealing even under shaft deflection common in mixer applications.