Head Seals
Head Seals
A head seal, also known as a gland seal or head-end seal, is a type of seal used in hydraulic and pneumatic cylinders to prevent fluid from leaking between the cylinder head and cylinder barrel. It ensures that the pressurized fluid within the cylinder is contained, allowing the system to maintain proper function and pressure.
Key Functions
Leak Prevention
The primary function of a head seal is to prevent hydraulic fluid or air from leaking out of the cylinder at the junction between the cylinder head and the barrel.
Pressure Retention
By sealing the interface between the cylinder head and the barrel, head seals help maintain the necessary pressure within the cylinder for efficient operation.
Contaminant Exclusion
Head seals also prevent contaminants from entering the cylinder, which could otherwise cause wear and damage to internal components.
Key Characteristics
Location
Head seals are located at the interface where the cylinder head (or gland) meets the cylinder barrel. This is typically at the end of the cylinder where the piston rod exits.
Material
Head seals are often made from durable materials such as rubber, polyurethane, PTFE (polytetrafluoroethylene), or other elastomers. The choice of material depends on factors like operating pressure, temperature, and the type of fluid used in the system.
Designs
There are various designs of head seals, including O-rings, lip seals, and U-cups. The design is selected based on the specific requirements of the application.
Durability
Head seals must withstand high pressures, friction, and wear. They are designed to be durable and maintain their sealing performance over time, even under harsh operating conditions.
Flexibility
They must be flexible enough to accommodate slight misalignments and movements between the cylinder head and barrel while maintaining an effective seal.
When To Choose A Custom Seal
Custom-designed sealing solutions play a pivotal role in addressing the diverse and intricate sealing challenges across various industries. As an expert, you understand that off-the-shelf sealing products often fail to meet the unique demands posed by specific applications, operating conditions, and...
Products & Resources
R. E. Purvis & Associates, Inc. is a recognized Sealing Technology Center for Parker's EPS (Engineered Polymer Systems) Division. Parker's EPS Division is a premier manufacturer of hydraulic seals which offers many geometric sealing profiles along with a vast selection of material options.
