Single Spring Seals
Single Spring Seals are mechanical seals that use one large coil spring to maintain contact between the rotating and stationary seal faces. They are widely used in pumps and rotating equipment handling clean or moderately contaminated fluids due to their simple design, reliability, and cost-effectiveness.
Key Features
Single heavy-duty coil spring design
Simple construction and easy installation
Self-adjusting for wear of seal faces
Suitable for low to moderate pressure applications
Cost-effective sealing solution
Reliable performance in general services
Main Components
Rotary Seal Face — rotates with the shaft
Stationary Seal Face — fixed to the housing
Single Coil Spring — provides closing force
Metal Parts (Drive Collar & Retainer) — transmit torque
Elastomers (O-rings / Rubber parts) — secondary sealing
How It Works
The single spring applies axial force that presses the rotating face against the stationary face. A thin lubricating film of fluid forms between the faces, preventing leakage while reducing friction and wear.
Advantages
Low cost and easy maintenance
Fewer parts → lower failure risk
Good for clean liquids
Compact and lightweight design
Widely available and interchangeable
Typical Applications
Water pumps
Domestic and industrial pumping systems
Oil transfer pumps
Light chemical handling
HVAC systems
Agriculture irrigation pumps