These pressure/vacuum sealing assemblies are supplied with single integral electrodes, and provide electrical feedthroughs for high power and high voltage supply connections in a range of electrode sizes. Standard glands are offered with Copper electrodes pre-installed in the gland and are torqued ready for installation. (Assemblies with Nickel or Stainless Steel electrodes are available on request.) They can also be supplied untorqued and without electrodes. Two styles are offered. The first offers our range of soft sealants along with ceramic insulators rated 2000V DC @ 200A max. The soft sealants can be replaced at a future date if retro fitting is required. The second style has a single piece PTFE combined sealant and insulator rated 8000V DC @ 200A max. A guide is given below to help you select the most appropriate sealant type for your application.
Sealant types: Viton (Brown) - Temperature range -40ºF to +435ºF
Retains its mechanical properties at high temperatures. Resistant to oils, solvents, fuels and corrosive industrial chemicals. Reusable in most cases.
PTFE (White) - Temperature range -328ºF to +480ºF
Least permeable to gases. Has a natural lubricity. Resists the adhesion of foreign matter. Reusable in most cases.
Lava (Grey mixture) - Temperature range -328ºF to +716ºF
Low thermal co-efficient, good electrical resistivity. Crushes to a powder under compression. Slightly porous to light gases and steam. Not recommended for vacuum applications. Not reusable. A version rated to 1598°F is available on request which uses a stainless steel electrode, please contact us for further information.
Other sealants including GraftiteTM are also available. Please contact us if you require assistance in the selection of the correct sealant.
Seals a single electrode
For use in gas or non conductive applications
Suited for pressure applications up to 8500 psi dependent on assembly selected
Ideal for use in vacuum applications and are rated to 6.67 x 10-4 Pa (6.67 x 10-6 mbar) for assemblies with Viton or PFA sealants. Lava sealants are not recommended for use in vacuum applications
Electrodes have tapped threads and are fitted with two nuts and washers at each end for ring tongue or lug type cable terminals
Our sealant glands maintain the integrity of the seal at the point of feedthrough penetration
They employ 'soft sealant' technology so that probes can be adjusted, removed and replaced yet are not deformed during installation
Power feedthrough applications are satisfied in many industries including vacuum furnaces, autoclaves, equipment enclosures, transformers and environmental chambers as well as high voltage feedthroughs to reactor vessels
Overall cost of ownership is often reduced when compared to other sealant techniques through reduction in installation time, downtime and the cost of replacement parts
Pressure ratings are as shown in the tables below (which have been determined at 68ºF with a stainless steel rod as the element). Caution: These sealing glands should be installed by suitably qualified personnel in accordance with relevant health and safety rules and with proper regard to safe working practices
Stainless Steel Thread Adaptors are available as an accessory
All assemblies are shipped pre lubricated. A single application disposable lubricant pack is available for the relubrication of threads, caps and follower at a later date
316L Body (and seat where applicable). Follower and cap in 303 or 304
Further details and dimensions are available on request