Dynamic seal Varitef SV

spring-energizedmetalstainless steel

Product description
Varitef SV is a single-acting sealing element composed of a PTFE sealing component and a stainless steel spring as preload element. Varitef SV is an active sealing element: as system pressure increases, the load on the sealing edges increases.
Varitef SV can also be used for slow rotary movements. Due to the combination of PTFE and stainless steel, it is suitable for a wide temperature range and can be sterilized, which makes it particularly suitable for valves, pumps and mixers in food and medical technology.
The PTFE compound may be filled with a special filler or with carbon to improve compressive strength. Other materials available on request. Due to the Varitef design, there are assembly limitations in closed groove designs; use of an open groove is recommended for easier assembly.

Fields of application

• static
• dynamic
• single acting
• double acting
• linear
• rotating (inactive)
• oscillating

Main use
valves, pumps, dosing equipment, food and medical technology

Materials
metal, PTFE, PTFE with fillers; stainless steel spring as preload element. PTFE compound may be filled with special filler or carbon to improve compressive strength.

Technical values

• Pressure: up to 35 MPa
• Temperature: -150°C to +225°C (material dependent)
• Speed: up to 20 m/s

Characteristics / technical specifications

• Product type: single-acting sealing element (active sealing element)
• Seal material: PTFE (with filler options, e.g. carbon)
• Preload element: stainless steel spring
• Pressure rating: up to 35 MPa
• Temperature range: -150°C to +225°C (material dependent)
• Max speed: up to 20 m/s
• Suitable for sterilization
• Recommended assembly: open groove (limitations with closed groove designs)
• Main applications: valves, pumps, dosing equipment, food and medical technology