PTFE Spring Energized Seals
| Material | PTFE |
| Tensile strength | 9 MN/m2 |
| Hardness | 50~65 Shore A |
| Bending elastic modulus | 0.6 GN/m2 |
Introduction
PTFE spring energized seals are spring-driven pressure-assisted seals with a polytetrafluoroethylene (PTFE) jacket, which are specially equipped with a corrosion-resistant metal energy storage spring to achieve spring-enhanced sealing.
The spring provides permanent elasticity to the sealing jacket and compensates for material wear and offset or eccentricity of mating parts.
The Spring energized seal is a sealing device consisting of a PTFE or other polymer, energized by a corrosion-resistant metal spring. When the seal is seated in the gland, the spring is under compression applying force on the gland sealing surfaces thereby creating a tight barrier to prevent gas or fluids from leaking. The spring also provides resiliency to compensate for seal wear, gland misalignment, or eccentricity. While spring force provides adequate force for sealing at low pressure, at high pressure the system pressure augments the spring force to provide an even tighter seal.
Application Areas
1. Chemical production: In chemical production, high-performance seals are often required to prevent medium leakage and environmental pollution. PTFE spring energy storage seals are widely used in chemical production due to their excellent sealing performance and corrosion resistance.
2. Oil extraction: During the oil extraction process, a large number of seals are required to prevent oil and gas leakage. PTFE spring energized seals have good corrosion resistance and high sealing performance and can meet the sealing requirements in the oil extraction process.
3. Food processing: In food processing, high-performance seals are needed to ensure food hygiene and safety. The spring energy storage seal has good self-lubricating and anti-adhesion properties, can be easily cleaned and disinfected, and meets the hygienic requirements of food processing.
4. Pharmaceutical manufacturing: In pharmaceutical manufacturing, high-performance seals are required to ensure the quality and safety of drugs. Spring energy storage seals have good corrosion resistance and high sealing performance, which can effectively prevent leakage and contamination of medicines.
Detection methods
1. Aging test: PTFE spring energized seals are placed in high temperatures, high humidity, and other environments for aging tests to evaluate their service life and stability.
2. Fatigue test: Through cyclic loading test, the pressure and temperature changes that the spring energy storage seal may be subjected to in actual use are simulated to evaluate its fatigue life and stability.
3. Friction coefficient test: measure the friction coefficient of PTFE seals under different conditions to evaluate their friction performance and wear resistance.
4. Gas permeability test: Use the gas permeability test device to measure the gas permeability of the spring energy storage seal to evaluate its gas sealing performance.
5. Chemical corrosion resistance test: Soak the spring energy storage seal in chemical reagents to evaluate its chemical corrosion resistance.
6. Ultrasonic testing: Use ultrasonic testing equipment to conduct non-destructive testing of spring energy storage seals to detect internal defects and damage.
Classification of Spring-Energized Seals
1. V-shaped spring seals are designed for high or low-pressure dynamic reciprocating or rotating applications.
2. Coil spring seals are designed for static or slow, infrequent dynamic sealing applications because of the high compressive load over a small deflection range, which makes these seals suitable for low-pressure or vacuum and extremely low-temperature (cryogenic) situations.
3. Inclined coil spring seals are suitable for low friction, dynamic reciprocating, and rotating applications. The seal produces a nearly flat load curve when compressed (installed). They provide constant predictable loading over a very wide deflection range.
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