Due to the triple offset sealing system the disc moves smoothly and free of friction and opens uniformly at all points along the specially designed body seat. When the disc is closed, the seal ring is compressed tightly into the seat without jamming or extruding. Temperature variations are reliably compensated without impairment of function.
All seal materials are reliable and designed for long life. Shafts are sealed by resilient seal rings or stuffing boxes. Choice of materials is determined according to media, pressure, and temperature conditions.
A special HTK design is available for extreme high temperature services (950 °C/ 1742 °F) such as expander turbine power recovery systems for catalytic crackers in refineries. The body and disc seal elements are robust and have an additional wear resisting hard facing. Quick closing/ opening < 1sec is available for emergency shut down.
When it is essential for health, safety or 100 percent isolation the HTK with double block & bleed seating should be the first choice. Two seals are arranged in tandem and separated by an annulus around the seal periphery for sampling or pressurization between the two seals. This annulus is connected by grooves and drillings in disc and shaft or drillings through the body seat and body wall into an exterior connection. In addition to bleeding off the annulus it can be pressurized with a suitable fluid to maintain a pressure seal.
to 4000 mm / 160 inch
- triple offset design with inclined conical sealing system
- solid metal or laminated metal seal
- operation: manual, electric pneumatic, hydraulic
- high temperature compatibility
- progressive sealing system
- reliable function in any position
- excellent flow characteristics
- combination of different functions: flow control and shut-off
- particularly suited for high cycle operation
- fast opening/closing function
- design for extremely high temperature applications
- seat hard-faced
- heating jacket
- steam purge at seat
- disc locking device, mansafe design
- spring-loaded stuffing box
- emission-free shaft sealing, complying with Clean Air Act 1990
- stuffing box design for inservice packing replacement
- butt weld and special end connections
For further technical information or purchasing details, please contact your local Adams representative or Adams Valves, Inc.