Steel 20 High Pressure Soft Seat Full Welded Body 1 Pieces Ball
Valve For Gas
|Design Standard||API 6D, BS 5351|
|Pressure/Temperature Chart||ASME B16.34, BS 5351|
|Face to face Dimension||ASME B16.10 , API 6D|
|Fire Safety||API 607, API 6FA|
|Testing Standard||API 598|
|Flange Details||ASME B16.5 up to 24″|
ASME B16.47 26″ and Above
|Butt-Weld End Details||ASME B16.25|
|Size Range||2″ – 48″ (DN50 – DN1200)|
|ASME Class||150#, 300#, 600#, 900#, 1500#, 2500#|
|Bore Type||Full Bore, Reduced Bore|
|Emergency grease||Injection Device Soft Sealing|
Plate or Pipe steel: A3/20#/SS304/TP304/SS316/TP316,
Forged Steel: A105 / LF2 / LF3 / F316 / F304 /F316L / F51 / F55 /
Casting Steel: WCB / LCB /LCC / CF8M / CF8 / CF3M / 4A / 6A /
|Ball&Stem||F6a / F316 / F304 / F316L / F51 / F55 / Inconel|
|Seats||Soft Sealing or Metal to Metal|
|Operation||Lever, Gearbox, Pneumatic Actuator, Electric Actuator|
Isolating valve for maintenance-free above- and below-ground
installations in pipelines, on compressor stations and platforms.
Min. temperature range -60°C to +50°C
Standard temperature range -29°C to +50°C
Max. temperature range -29°C to +160°C
Features & advantages
Upstream Sealing At low pressure, seat-to-ball contact is
maintained by Belleville springs. At higher pressures, seat contact
is reinforced by line pressure.
Automatic Internal Relief of Body Pressure Relief of excess body
cavity pressure is automatic, avoiding dangerous pressure buildup.
Any pressure exceeding downstream line pressure by approximately
200 psi pushes the downstream seat away from the ball, allowing the
pressure to relieve into the pipeline.
Rotating Seat Rings The exclusive rotating seat feature is standard
in the teko fully welded ball valve sizes 14” (350 mm) and larger.
Both seats rotate 15 degrees each time the valve is closed,
exposing a new pinch point and evenly distributed seat wear
The pinch point is the area of the seat insert that experiences an
increased velocity when the valve is seated closed and unseated
open. This is where the seat seal experiences the most wear, and in
most valves, where a leak path begins. By rotating the seat ring,
the pinch point wear is distributed throughout the seat seal,
providing an increase in seat life.
Regardless of size or pressure rating, every teko fully welded ball
valve is trunnion mounted. High-strength forged stems are located
in PTFE impregnated stainless steels bearings for smooth operation.
Trunnion mounted stems absorb the thrust from line pressure,
preventing excess friction between the ball and seats, so even at
full rated working pressure, operating torque stays low.
Whether in the fully open or fully closed position, pressure on
each side of the ball is blocked from the body cavity by the seat
ring. The body cavity can then be bled down or drained through the
body port. When you block-and-bleed a teko fully welded ball valve,
the following can be accomplished: