Function: The individual piston rod seal has various designs for the sealing lip, which can achieve the best sealing effect, reduce friction, and ensure the service life of the seal. The metal spring provides power to the sealing lip, ensuring that there will be no leakage even under zero pressure. Due to the excellent performance of PTFE material, the rod will not slide or move at different speeds, even when the speed is very slow. Due to the viscosity of the medium, there will be no leakage at all.
Main Features：
l Low friction coefficient, effectively reducing wear, self- lubricating
l Anti-aging, no permanent elastic deformation
l Significantly improve the sealing capacity and service life
l Chemical resistance
Working Principle：
The spring energized seals consist of a jacket made of the rmoplastic like PTFE(or other polymer materials) and an embedded spring made of different materials. At certain pressures, the system pressure will energize the seal and prevent leakage. But at low pressures, additional energy is required to force the jacket material to mate with the hardware. The solution to this is to add a spring to the seal. The spring provides the needed sealing-energy to prevent leakage at low media pressures. It is widely used in dynamic and static application.
Represents a low-pressure sealing situation where the system pressure alone does not provide enough force to seal. The spring in this situation provides the necessary sealing force. Below approximately 0.69 Mpa the spring energizer supplies the internal force to create a positive seal.
Represents a higher pressure application where system pressure is sufficient to create a positive seal. This threshold occurs at approximately 0.69Mpa allowing system pressure to take over and provide the sealing force.
Spring Types and Materials:
Hedical would flat spring design. Features on high spring load with small deflection range. Excellent in static face sealing.
Cantilevered finger spring design, The shape of the spring makes its load concentrated on the front end of the sealing lip, which makes
it have a scraping effect, with a medium unit load and deformation range.
Coiled wire spring design. It has very low spring loading. Constant spring loading over a wide range of deflection.
Wrapped and formed ribbon spring type, most resilient spring material. It has a very high spring loading. Only available in radial-type
seal design.
Heavy duty, high load EW spring design. It can effectively prevent changes in sealing force caused by environmental factors. Only
available in static face sealing application.
Typical Applications:
l High performance liquid chromatography pumps
l Laboratory equipments
l Low friction pneumatic equipments
l Medical & laboratory equipments
l Oilfield equipments
l Rotary joints
l LNG Nozzle