O Ring Single Spring Mechanical Seal For Chemical Flow Pump Seal

This O‑ring single spring mechanical seal is a universal sealing solution specifically designed for chemical flow pumps. It features an open single‑spring configuration combined with a high‑performance O‑ring secondary seal, engineered to resolve leakage issues in chemical media transfer. Compared to complex sealing systems, this series stands out for its compact design, excellent clogging resistance, and ease of installation, making it the preferred choice for the chemical industry - including acid/alkali handling, solvent transfer, and fine chemical processing.

In chemical process services, the media often contain crystallizing tendencies or fine particulates. Conventional balanced multi‑spring seals are prone to failure due to spring pocket clogging. Our single‑spring design features a larger coil pitch, using centrifugal force from pump rotation to automatically expel debris, ensuring that the compensating mechanism remains responsive even in viscous or crystallizing media.

Chemical stability depends critically on the O‑ring material. We offer multiple custom options based on the specific chemical process:

• FKM (Viton ®): Suitable for most hydrocarbons and acids.
• EPDM: For hot water, steam, and mild alkaline environments.
• FFKM (Perfluoroelastomer): For aggressive solvents, extreme temperatures, and strongly oxidizing media, ensuring no swelling or degradation in severe chemical service.

Chemical production lines demand high uptime. The simple, straightforward design of this seal significantly reduces installation errors. The use of high‑performance SS316L or Hastelloy® C metal components ensures resistance to stress corrosion cracking under high‑frequency operation of chemical pumps.

In fine chemical production, media often require high purity while being highly corrosive.

• Application examples: Reactor circulation pumps, solvent recovery systems.
• Pain point solved: For aggressive solvents such as toluene and xylene, we specify FFKM (perfluoroelastomer) O‑rings to prevent seal swelling and degradation, ensuring continuous production line operation and avoiding costly downtime and product contamination caused by frequent seal replacements.

Media in this sector frequently contain crystalline solids or suspended particulates.

• Application examples: Phosphoric acid transfer pumps, pesticide formulation mixing pumps.
• Pain point solved: The wide‑pitch single‑spring design effectively prevents spring clogging due to crystallization of pesticide intermediates. Compared to multi‑spring configurations, it handles non‑clean fluids containing 3%-5% solids with far greater reliability.

The pharmaceutical industry demands extremely high standards of cleanliness and material stability.

• Application examples: Pharmaceutical intermediate pumps, high‑purity water systems.
• Pain point solved: FDA‑compliant seal materials combined with a dead‑leg‑free design. The single‑spring construction is easier to clean through CIP (Clean‑in‑Place) and SIP (Sterilize‑in‑Place) procedures, minimizing bacterial growth risks and fully complying with GMP (Good Manufacturing Practice) requirements.

Mixed wastewater streams with complex, often unknown chemical compositions.

• Application examples: Strong acid neutralization sump pumps, chemical industrial wastewater lift pumps.
• Pain point solved: For industrial wastewater containing chlorides, we offer springs made of Hastelloy® C to prevent stress corrosion cracking (SCC). This significantly improves average seal life in harsh environmental protection equipment.

Light hydrocarbon streams and related chemical additives.

• Application examples: Hydrocarbon transfer pumps, oil‑water separation pumps.
• Pain point solved: Meets hydraulic balance requirements per API 610. At peripheral speeds up to 15 m/s, the O‑ring single‑spring seal delivers stable dynamic tracking, ensuring zero leakage under pressure fluctuations - thereby reducing fire risks in petrochemical plants.

Extensively used in all kinds of industries such as chemical industry, petroleum industry, medical technique, food industry, sewage-disposal industry, steel industry, semi-conduct industry and so on.

Mechanical sealing, pressure vessel, gas compressor, reaction vessel, heat exchanger, boiler, filter and so on.

A: Chemical media (e.g., pesticides, dyes, fine chemical liquids) often contain fine particulates or have a tendency to crystallize. The narrow clearances in multi‑spring seals are easily clogged by crystallized deposits, leading to seal failure. The single‑spring design offers superior self‑cleaning and fault‑tolerant capability, making it more suitable for long‑term operation in "non‑clean" chemical environments.

A: For highly aggressive chemical service, we strongly recommend SSiC vs. SSiC (sintered silicon carbide). Compared to conventional carbon graphite or metal alloys, silicon carbide exhibits near‑perfect chemical inertness in extreme acidic or alkaline environments, combined with excellent wear resistance - effectively handling frequent start‑stop cycles of chemical pumps.

A: Yes. Given the variations in chemical pump cavity dimensions, we can customize the O‑ring cross‑section and metal base material (e.g., Monel® or Titanium) to your specific installed dimensions, meeting requirements for pitting resistance in particular media.

A: Since the O‑ring serves as the secondary seal, the shaft surface roughness should be maintained at Ra ≤ 0.4 μm. Before installation, apply a compatible lubricant (e.g., silicone grease) to the shaft and O‑ring surfaces to prevent O‑ring twisting or abrasion during assembly.

Port of Loading: Shanghai

Shipping Method: DHL, UPS, FEDEX, TNT, etc

Payment Terms: T/T, Western Union, Money Gram