Product Overview
Single mechanical seal parts are the replaceable components used to assemble or repair single-face mechanical seals for pumps and rotating equipment. These parts include the rotating face, stationary seat, spring(s) or bellows, secondary seals (O-rings / gaskets), gland and fasteners. We supply full replacement kits and individual components to match OEM form-fit-function for standard single seals used in process, water, HVAC and light chemical applications.
Key Components
Rotary Face (Rotating Ring)
Precision-lapped face that rotates with the shaft. Typical materials: carbon (graphite), silicon carbide (RBSiC), tungsten carbide. Selection depends on pressure, speed and fluid abrasiveness.
Stationary Seat (Mating Ring)
Hardened seat that remains stationary; normally ceramic, silicon carbide, or tungsten carbide. Proper matching of rotary and stationary faces controls leakage and wear.
Spring / Bellows
Provides axial load to keep the faces in contact. Options: single coil spring, multiple coil springs, or elastomer/metal bellows (for automatic compensation and dry-running protection).
Secondary Seals (O-rings / V-rings / PTFE)
Seal between metal parts and shaft/gland. Materials: NBR, EPDM, FKM (Viton®), FFKM (Kalrez®), PTFE components for aggressive chemicals.
Gland Plate, Sleeve & Fasteners
Gland holds the stationary seat and provides mounting. Shaft sleeves available for worn shafts or sleeve-mounted seal designs.
Materials & Performance (E-E-T-A)
Experience & Expertise: Our engineering selection follows proven industry criteria — match face hardness, thermal conductivity and chemical compatibility to minimize face wear and extend MTBR (mean time between repairs).
Authoritativeness: Component choices and test practices align with common industry references (standard single-seal data and OEM guidance).
Trustworthiness / Accuracy: Material temperature and chemical limits are provided for selection; always confirm with compatibility charts and service testing. For example, silicon carbide faces and metal bellows are used for higher-temperature services up to several hundred °C.
Actionability: Contact our engineering team with fluid data, temperature, pressure and shaft diameter to receive a recommended parts kit and installation checklist.
Typical Operating Ranges & Technical Highlights
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Common shaft sizes covered: Metric and imperial — typical stocked ranges begin at 8 mm up to 70–150 mm depending on design; many OEMs supply 8–75 mm as common pump sizes.
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Pressure: General-purpose elastomer bellows / single spring seals commonly used up to ~10 bar (≈150 psi); heavy-duty single seals (specific face geometry, hard faces) can be applied at higher differential pressures — dynamic ratings vary by design (examples: 41 bar dynamic for certain 76 mm seals at given rpm/conditions). Always verify with seal selection data.
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Temperature: Elastomer secondary seals commonly operate between roughly -30°C to +150°C (varies by elastomer); fluorocarbon (FKM) and FFKM have higher ranges; silicon-carbide/tungsten-carbide faces perform reliably to hundreds of °C in specialized designs.
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Speed: Typical pump applications up to 3,600 RPM for common sizes; high speed or high surface velocity applications require hardened faces and specific lubrication/flush plans.
Applications
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Centrifugal pumps (water treatment, chemical dosing, HVAC)
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Process pumps in petrochemical and chemical plants (with appropriate face and secondary seal selection)
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Industrial mixers and agitators
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OEM spare parts supply and aftermarket repair shops
Technical Specifications
Note: final selection depends on specific pump model, service fluid, temperature, pressure and shaft condition. The table below lists typical ranges used for specifying parts.
| Parameter | Typical Value / Range |
|---|---|
| Shaft diameter (metric) | 8 mm – 150 mm (common stocked 8–75 mm). |
| Dynamic pressure (typical general-purpose) | ≤ 10 bar for standard elastomer bellows/single-spring seals; specialized single seals up to 20–40 bar depending on face materials and design. |
| Temperature (elastomer-based) | -30°C to +150°C (NBR/EPDM standard ranges), FKM up to ~+200–260°C, FFKM up to ~+300°C (material dependent). |
| Face materials | Carbon (graphite), Silicon Carbide (RBSiC), Tungsten Carbide, Ceramic. |
| Max rotational speed | Typical 3,600 RPM for pump seals; depends on face material and size. |
(These are representative selection targets; please provide the exact pump model or shaft dimensions for an exact parts match.)
Common Sizes & Ordering Guide
We stock and supply standard replacement components and full kits for common pump shaft diameters. Common stocked shaft diameters (metric): 8, 10, 12, 15, 16, 18, 20, 22, 25, 28, 30, 32, 35, 40, 45, 50, 65, 75. For larger diameters (≥ 80 mm), select engineered single seals or sleeve-mounted designs.
Common product aliases / keywords included for buyer matching: single spring seal parts, single-face seal kit, single mechanical seal replacement parts, pump seal spare parts, single seal components, rotating seal parts.
Product Advantages
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Direct OEM form-fit parts and universal replacements — fast interchangeability for common pump models.
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Wide material options — carbon, SiC, WC, ceramics, plus elastomer choices to match chemical compatibility.
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Kitted for quick maintenance — each kit contains all wear components to minimize downtime (rotary, stationary, spring/bellows, O-rings, hardware).
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Technical support — application review (fluid, temp, pressure, rpm) for correct face pairing and secondary seal selection.
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Quality control — lapped faces, concentricity checks and material traceability for critical components.
Material Comparison
| Feature | Carbon (Graphite) | Silicon Carbide (SiC) | Tungsten Carbide (WC) |
|---|---|---|---|
| Best for | General service, forgiving to abrasion | High pressure, abrasive, high temp | Very hard, for abrasive/corrosive wear |
| Temperature capability | Moderate | High (up to ~400°C in specialized designs). | High |
| Typical use | Water, light chemicals | Petrochemical, abrasive slurries | Slurries, abrasive services |
| Cost | Low | Medium–High | High |
FAQ
Q1: What info do you need to send a correct replacement parts quote?
A: Provide pump make/model, shaft diameter, fluid name and concentration, operating temperature, operating pressure, rotational speed (RPM), and any observed leakage or failure symptoms.
Q2: Do you sell individual components or only full kits?
A: Both — we sell individual parts (rotary ring, stationary seat, springs, O-rings) and complete kits for faster maintenance. Kits ensure all wear parts are replaced at once.
Q3: Can your seals handle abrasive fluids or solids?
A: Use hardface combinations (SiC vs SiC or WC) and specific hardware; we recommend flush plans and improved filtration. For abrasive slurries, hardened faces and protective sleeves are standard.
Q4: What tolerance on shaft diameter is acceptable?
A: Typical tolerance is H7/h6 fits depending on sleeve use; send shaft measurement to verify. Sleeve-mounted designs available for worn shafts.
Q5: Do you provide material certificates or test documentation?
A: Yes — material traceability and test reports can be supplied on request for batch orders; contact sales for documentation options.
Product Catalog & Downloads
I created a concise downloadable product catalog/spec sheet for common single mechanical seal parts and kits. It includes typical SKU lines, component lists, nominal shaft ranges, pressure and temperature guidance for ordering.
Ordering & Contact
To request a quote, provide the pump model and service details (shaft diameter, fluid, temp, pressure, rpm). We will respond with recommended kit (OEM cross or our part number), price and lead time.
Hengshui Aohong— Mechanical Seals Division
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Email: sales@aohongglobal.com (for datasheet requests and fast quotes)
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Phone: +(86) 153 7318 1024 (please replace with your official number)