Australian Pipeline Valve - Installation, Operation and Maintenance Manual
4
EXPANDING SEAL PLUG VALVE DOUBLE BLOCK & BLEED API6D - TWIN SERIES
PERFORMANCE SPECIFICATION
TECHNICAL SPECIFICATION
Class (MPa) Shell Test (MPa) Seating Test Suitable Suitable
Operator
Handwheel, bevel gear,electric-actuated
Temp.
Medium
150
3.0
2.2
180°C* Water oil
and gas
Design Standard
API599, API6D, ISO 14313
300
7.5
5.5
Face to Face
ASME B16.10
600
15.0
11.0
Flange End
ASME B16.5
900
22.5
16.5
Test and Inspection
API598, API6D
* High/ low temperature available up to 2500 Class.
Non-slam
The operator is self locking so that line pressure
cannot force the plug to rotate. This prevents
slamming and risk of injury.
Tight shut off
When the valve is closed, the seating segments are
wedged tightly between the plug and body metal
to metal. The soft seat material is compressed into
the recessed groove. The design does not require
springs or pressure to effect a seal.
Double block and bleed and zero leakage
The Twinseal valve provides upstream and
downstream seal in both directions and a bleed
point is then provided between the two seats, to
prove no leakage.
Zero-leakage
The Twinseal meets the demands of frequent
cycling and verifiable, reliable zero leakage with
positive shut-off upstream and downstream.
Zero wear
Twinseal valves provide positive shut-off with
zero leakage.
The design of the valve ensures that during
opening and closing the seals are not in contact
with the body. Only at the last stage of closing
does the seal contact the body - and then the
force is compression only.
Every turn of the handwheel retracts the seals
from the body.
That means no wear to the seals and long life.
Large port
Twinseal valves have a nominal plug port of 60
- 70% thus effecting minimum pressure drop. True
circular full port also available.
Closing Operation
