Key Features

• Short Type 1: The John Crane Type 2 seal equivalent has a shorter installed length than Type 1, engineered for pumps with shallow stuffing boxes where axial space is limited. No housing modification required – true drop-in fit.

• Positive Drive: Uses the same reliable rubber bellow drive principle as the original rubber bellow mechanical seals, absorbing shaft end-play and misalignment while transmitting torque through the bellow drive band and notches – no set screws to score the shaft.

• Non-Clogging Outside-Mounted Single Spring: Large single coil spring is externally mounted and resists fouling from hard water scale or light slurries – a key advantage of Single Spring mechanical seals in dirty water service compared to enclosed multi-spring designs.

• Shaft Protection : The rubber bellow covers the shaft area under the seal, protecting against corrosion and fretting wear – superior to packed glands and open O-ring pusher seals.

• Cost-Effective OEM Alternative: This single spring elastomer bellows seals replacement delivers identical performance to the OEM at a fraction of the cost. Available 10–100mm (3/8"–4") with Carbon/Ceramic/SiC/TC face options and NBR/Viton/EPDM elastomers. Custom sizes and OEM branding supported.

Applications – Where to Use This Rubber Bellow Mechanical Seals (John Crane Type 2 Equivalent)

• Centrifugal water pumps & booster pumps with shallow stuffing box (requires Type 2 short length)

• HVAC circulating pumps & chilled water / hot water systems

• Wastewater treatment – non-abrasive effluent pumps

• Light process pumps & top-entry mixers / agitators

• OEM water pump assemblies – domestic, commercial, irrigation

• Swimming pool pumps, small boiler feed pumps

Product Specifications

Workshop

This workshop is equipped with professional processing equipment and integrated with standardized material warehousing management, enabling a one-stop production process from precision machining to finished product delivery. It ensures rubber bellow mechanical seals machining accuracy and production efficiency, meeting various high-specification manufacturing requirements.

Product Research, Development and Testing

Our Product R&D and Testing focuses on optimizing seal performance through advanced simulation and material analysis. All John crane type 2 seals undergo rigorous trials, including thermal cycling and pressure tests, to ensure durability, minimal leakage, and long service life in demanding industrial environments.

Industry Solutions

FAQ

Q: Is your Type 2 seal a direct replacement for the John Crane Type 2?

A: Yes. Our Type 2 single spring elastomer bellows seal is a direct dimensional and functional replacement for the OEM John Crane Type 2. It maintains the same compact working height, drive band design, and imperial/metric sizing for a drop-in fit in pumps and mixers originally equipped with the Type 2 series.

Q: Why choose a Type 2 elastomer bellows seal for my application?

A: The Type 2 design is ideal for short stuffing boxes and dirty fluids. The single large spring resists clogging in wastewater and slurries, while the elastomer bellows eliminates the dynamic O-ring found in pusher seals, preventing sticking and hang-up in gritty environments.

Q: Can this rubber bellow mechanical seals handle hot water or chemicals?

A: Yes, with proper elastomer selection. For hot water up to 120°C choose EPDM bellow; for chemicals/oils choose Viton (FKM). The standard Carbon/Ceramic face set suits most water-based fluids. For abrasive media, upgrade to SiC/SiC faces.

Q: Do you supply John Crane Type 2 seal / Single Spring mechanical seals as a manufacturer with factory direct price?

A: Yes. MIAOYU is an ISO 9001 certified manufacturer of single spring elastomer bellows seals in China. We supply direct to pump distributors, OEMs and MRO buyers at factory prices with OEM/private label options and fast global shipping from Ningbo.