Precision Mechanical Seals & Rotary Unions

A mechanical seal is a device that joins rotating equipment — such as a pump shaft — to a stationary housing, preventing process fluid from leaking along the shaft. It works by pressing two precision-lapped seal faces (a rotating face and a stationary seat) together with spring force and hydraulic pressure. The microscopic liquid film between the faces provides both lubrication and a leak-tight barrier. Beston Seals manufactures pusher seals (spring-energised), non-pusher seals (bellow-energised), and cartridge assemblies for all standard pump configurations.

Mechanical seals are significant elements in centrifugal pump systems. These devices reserve the veracity of the pump systems by thwarting fluid leaks and keeping impurities out. Diverse types of Mechanical Seals are single and double mechanical seal, balanced and unbalanced seals, pusher seals, non-pusher seals, cartridge seals, dry running mechanical seal for agitators, mixers, reactors & blenders, split mechanical seal for agitators, mixers, reactors & blenders, mechanical seal face, ring, bushes & sleeves, supply systems and bearing isolator.

A single mechanical seal is used when the process fluid is clean, non-hazardous, and the leakage of a small amount of fluid to atmosphere is acceptable (e.g., clean water, general chemicals). A double mechanical seal — either back-to-back or face-to-face — is required when the fluid is toxic, flammable, abrasive, or must be prevented from atmospheric contact. Double seals use a barrier or buffer fluid (typically oil or water) maintained at a pressure above or below the process fluid pressure, providing a secondary containment layer. Our engineering team will recommend the correct arrangement based on your fluid properties, pressure, and temperature.

We offer all major seal face material combinations: Silicon Carbide (SiC) vs SiC for abrasive or aggressive chemicals; Carbon Graphite vs SiC for general-duty pumps; Tungsten Carbide vs SiC for slurry and high-pressure applications. Secondary sealing elements are available in NBR (nitrile), EPDM, Viton (FKM), and PTFE to suit your process temperature and chemical compatibility requirements.

Yes. We manufacture cartridge mechanical seals designed to meet API Standard 682 (Shaft Sealing Systems for Centrifugal and Rotary Pumps), which is mandatory for oil & gas and petrochemical applications. API 682 defines seal categories (1, 2, 3), arrangements (1, 2, 3), and flush plan specifications (Plan 11, 21, 23, 31, 32, 52, 53A/B/C, 54, 62, 65). Please share your data sheet or equipment tag and we will confirm the correct arrangement and plan.

Yes. Beston Seals manufactures interchangeable replacement seals for most standard types from major OEMs including John Crane (Type 1, 21, 8B1, 9T), EagleBurgmann (MG1, MG12, M7N, H75), Flowserve (ISC2, Durametallic, GPSS), AES (Protect, Safematic), and Roten (Type U). Please provide the existing seal model number, shaft diameter, and operating conditions when enquiring.

There is no minimum order quantity — we supply from 1 unit to annual blanket orders. Standard catalogue seals are typically available ex-stock or within 3–7 working days. Custom-engineered or special material seals carry a lead time of 2–4 weeks depending on complexity. Urgent requirements can be discussed directly with our sales team at +91-9820007401.

Yes. Beston Seals exports to more than 20 countries including the UAE, Saudi Arabia, USA, UK, Germany, Singapore, Malaysia, and several African markets. All export shipments comply with relevant trade documentation requirements. We can supply with country-of-origin certificates, test certificates, and third-party inspection if required.