The PTFE Wedge single acting mechanical seal for Kewpump from NINGBO MIAOYU is a single-acting, non-balanced wedge seal engineered as a drop-in replacement for Kewpump KS, KA and KCM series chemical process pumps, requiring no housing modification. 

The gland flange is pre-aligned with Kewpump flush-port geometry for effective face cooling, and face sets are offered in Carbon / SiC / Tungsten Carbide versus Ceramic / SiC / TC with stainless-steel springs.

PTFE dry mechanical seals offer a cost-effective, factory-direct price point, supplying pure-PTFE wedge secondary seals engineered for gas-phase or low-lubricity duty on top-entry mixers, reaction kettles and solvent recovery columns. As a drop-in OEM-interchangeable ptfe mechanical seal for AES T01/T03/T04, John Crane Type 9 and Flowserve RO configurations, the dry-running variant pairs a self-lubricating carbon graphite rotating face with SiC or TC stationary seat, holding leak-tight performance up to 260°C and 25 bar with no barrier fluid required. 

• Buffer Fluid Potential: The space between seals can be filled with a buffer fluid to lubricate the faces and prevent crystallization of foam concentrates.

• Corrosion Resistant Alloys: Available in Duplex or Monel for seawater fire pumps on offshore platforms.

• Spiral Groove Technology: Laser-etched grooves generate aerodynamic lift, separating the faces even at low speeds.

• Low Power Consumption: Contactless running consumes 90% less power than liquid-lubricated dual seals.

The stationary face PTFE bellow mechanical seal is an externally mounted, single-acting seal where the PTFE bellow remains stationary in the gland—eliminating rotating-bellow fatigue and \"whipping,\" while keeping all wetted metal parts out of contact with the process fluid. This stationary face mechanical seal has no metal exposed to the media, making it purpose-built for aggressive service such as hydrochloric acid pickling lines, solvents and medium-corrosion chemical pumps. The stationary seat in this stationary face mechanical seal is offered in Ceramic, SiC, Tungsten Carbide or filled PTFE, paired against a Carbon/SiC/TC rotary face, with 316SS spring and PTFE secondary seal, rated –20°C to 200°C, ≤1.7 MPa and ≤25 m/s across shaft sizes 16–100 mm.

• Chemical Inertness: The switch to a PTFE wedge allows standard Roten-style seals to operate in fluids that would destroy NBR or EPDM rubber.

• Short Working Length: Designed to fit shallow stuffing boxes without modification to the reactor flange.

The Roten Type 2 O ring mechanical seal is a globally recognized industrial sealing solution, originally patented in Italy. This versatile seal features a robust conical spring and O-ring pusher design, engineered for a wide range of applications including water, chemicals, hydrocarbons, and food processing. Roten mechanical seal is available in shaft diameters from 8mm to 100mm and operates effectively in temperatures from -35°C to 180°C, with pressure ratings up to 16 bar. Known for its reliability and ease of installation, it serves as a direct replacement for numerous pump brands and is compliant with EN 12756 and ISO 3069 standards.

The Roten silicon carbide pump shaft mechanical seal replacement is a high-performance sealing solution engineered for demanding industrial applications. Designed as a direct drop-in replacement for standard Roten Type 2 seals, this unit features monolithic silicon carbide (SiC) sealing faces for superior durability. It is built to handle abrasive media, high temperatures, and corrosive environments that would quickly degrade standard ceramic seals. Compatible with a wide range of centrifugal and rotary pumps, this silicon carbide mechanical seal ensures reliable, long-lasting leak prevention for water, chemicals, and light slurries.

The Roten mechanical seal is a heavy-duty sealing solution engineered specifically for the extreme conditions of boiler feed systems. Boiler feed water pump mechanical seal is designed as a direct replacement for Roten Type 37, Type E, and similar metal bellows seals commonly found in European-made pumps. This seal features a welded metal bellows construction that eliminates elastomeric O-rings in the primary sealing area, making it immune to the hardening and hang-up failures caused by high-temperature condensate (typically 180–280°C). 

The Roten Replacement Mechanical Seal  is a precision-engineered dual-seal assembly designed for critical applications requiring zero leakage and maximum safety. This configuration features two sets of sealing faces oriented \"face to face\"—pointing inward toward a common barrier fluid cavity—making it ideal for handling hazardous, abrasive, or high-temperature fluids that standard single seals cannot contain. Engineered as a direct OEM-compatible replacement for Roten Type 5 and similar models, it delivers reliable performance in chemical, pharmaceutical, and food processing pumps where space is limited and operational integrity is paramount.

The Roten Type 3 & Type 5 mechanical seal replacement is a precision-engineered sealing solution designed for industrial pumps handling water, chemicals, and light slurries. Manufactured by MIAOYU, these seals are fully interchangeable with original Roten Type 3 (general-purpose) and Type 5 (heavy-duty) models, ensuring reliable performance in chemical processing, water treatment, and HVAC systems. Available in material combinations like silicon carbide, tungsten carbide, and ceramic, they provide a cost-effective alternative for maintenance and OEM applications.

The Roten Type 877 mechanical real replacement by MIAOYU is a precision-engineered double/tandem cartridge seal designed for critical applications where zero leakage is mandatory. Fully interchangeable with Roten 877/877H and equivalents like Burgmann M78N, this seal features a compact, bi-directional design with multiple springs.

As a dedicated grundfos pump mechanical seal manufacturer, MiaoYu Seals produces the rubber cartridge mechanical seals are pre-assembled, drop-in OEM-interchangeable replacements for Grundfos CR, CRN, TP, NB and NK series circulators, multistage boosters and end-suction pumps. Featuring a balanced O-ring pusher design with EPDM or NBR rubber drive elements and a torque-pin locked gland, these grundfos pump mechanical seals eliminate field spring setting errors and cut installation time by up to 60%. The flexible rubber bellows/O-ring stack absorbs minor shaft runout and thermal expansion while maintaining face contact from 0.5 to 10 bar and –10 to 120°C. Carbon graphite rotating face paired with alumina ceramic or tungsten carbide stationary seat—supplied factory-direct from our ISO 9001 workshop at wholesale cost.

As a dedicated rubber bellows seal manufacturer, MiaoYu Seals produces interference-fit, plug-in / Griploc-style OEM-interchangeable Flygt bellow shaft seals for 2000 & 3000 series submersible wastewater pumps (2066, 2102, 3068, 3085, 3102, 3127). Engineered with debris-shedding rubber bellows and bonded alumina/SiC seats, our seals hold leak-free separation between raw sewage and the oil chamber.

As a dedicated face to face mechanical seal manufacturer, our rubber Roten mechanical seals (face-to-face type) are drop-in OEM-interchangeable swaps for Roten Type 2, 2a and 5 configurations—also cross-referenced as AES M37G and N47—fitted on Calpeda, Ebara, Pedrollo and other Italian end-suction water pumps. Built on a symmetric face-to-face design, the rubber mechanical seal uses a single coil spring with friction drive and NBR, EPDM or FKM O-ring secondary sealing on both rotating and stationary sides, eliminating handedness so one assembly fits either rotation direction.

Single spring rubber bellow mechanical seals are unbalanced, inside-mounted elastomer bellow seals designed as drop-in OEM-interchangeable replacements for John Crane Type 1, AES W01/W02, Roten Type 1, MG1 and similar industry-standard configurations. The rubber bellow isolates the spring from the pumped fluid while absorbing shaft runout and axial end-play, and the non-clog coil spring ensures consistent face loading even when debris is present. Precision-lapped carbon graphite faces paired with alumina ceramic or tungsten carbide stationary seats hold leakage below 0.1 ml/h at up to 1.2 MPa and 180°C, covering shaft sizes from 12 mm to 100 mm. Ideal for raw water pumps, sewage lift stations, cooling towers, irrigation and light chemical transfer.

Elastomer rubber bellow mechanical seals for sale are unbalanced, inside-mounted single-spring assemblies designed as drop-in OEM-interchangeable replacements for John Crane Type 1, AES W01/W02, Roten Type 1, MG1 and other industry-standard configurations. Precision-lapped carbon graphite faces paired with alumina ceramic or tungsten carbide stationary seats hold leakage below 0.1 ml/h at up to 1.2 MPa and 180°C, covering shaft sizes from 12 mm to 100 mm. Ideal for raw water pumps, sewage lift stations, cooling towers, irrigation and light chemical transfer—available factory-direct from our ISO 9001 workshop at wholesale cost.

Single and double rubber mechanical seals are modular elastomer bellow assemblies designed as drop-in OEM-interchangeable replacements for John Crane Type 1, AES W01/W02, Roten Type 1, MG1 and similar industry-standard configurations. Precision-lapped faces hold leakage below 0.1 ml/h at up to 1.2 MPa and 180°C, covering shaft sizes from 12 mm to 100 mm.