POINTS WHERE EFFORTS ARE MADE TO BREAK THE TORQUES IN THE OPENING AND
LEAVING THE LOWER HOUSING FREE FOR SEDIMENT PURGE
DEGV
INDICATIONS OF THE STRESS TO WHICH THE VALVE IS SUBJECTED BY ITS DESIGN
DOUBLE EXPANSION GATE BY API-6D
DEGV
THE DOUBLE
EXPANSION GATE
VALVE DOES NOT
ALLOW SOFT SEALS
DUE TO ITS API-6D
DESIGN
THE VALVE IS
SUBJECTED TO GREAT
EFFORTS TO GIVE ITS
METAL-METAL
HERMETIC SEAL
THE YELLOW
ARROWS INDICATE
THE HIGH
PRESSURES TO
WHICH IT IS
SUBJECTED TO BE
EFFICIENT IN
OPERATION DUE TO
ITS STRENGTH,
WHICH METALS
MUST BE OF HIGH
HARDNESS SUCH AS
AISI 410 AND
TUNGSTEN CARBIDE
EFFORTS TO CARRY OUT THE CLOSURE IN A HERMETIC MANNER, WHICH IS
AISI 410 AND HIGH STRENGTH TUNGSTEN CARBIDE STEELS RECOMMENDED
DEGV
STOP ON THE LOWER PART TO CARRY OUT THE EXPANSION OPERATION
DEGV
VIEW OF THE INTERNALS OF A DOUBLE EXPANSION GATE VALVE
DEGV
AISI 410 + TC Double Expansion Gate Valve Segmentss
Mirror finish throughout the Gate and Seat area, providing tightness with a high seal on
the gate and seats, preventing wear due to friction.
METAL SEAL – ZERO LEAK METAL
Metal Stamp Detail - Metal
•
•
The valve closes by pushing the stem.
For the valve to guarantee efficient
operation, it requires that the gate segments
be made of forged AISI 410 stainless steel
completely coated with tungsten carbide
without using soft parts or carbon steels.
• The hermetic seal is generated by the
force applied to the stem, also providing
the ability to pulverize suspended solids.
The seal is independent of fluid pressure.
Process Function
The Double Expansion Gate Valve must be
100% open or 100% closed