|Steel, Stainless Steel, Monel, Hastelloy, Duplex, Super Duplex, Other|
|Flanged, Welded Mouth|
|Manual, Electric, Pneumatic, Hydraulic|
|(-200 °C) – (+550 °C)|
|2″ – 36″|
|Class 150 – 600|
Common valve designs like most gate and ball valves depend on line pressure or springs to achieve sealing and cannot guarantee long-term double block & bleed service as their sealing mecha-nism is based on friction and tearing and consequently seal abra-sion and scored seating elements may lead to product loss and contamination.
Dual expanding plug valves represent. the “single valve solution” and avoidall these problems, they are easy to operate require very little maintenance and offer verifiable double block & bleed service with. an extraordinary long lifetime.
Not only do we help our clients to avoid product loss, our valves prevent fuel contamination in Multi- Product- Manifolds, avoid errors in meter calibration and at the same time help to protect health and the environment by positively containing the luid in the pipeline.
Dual expanding plug valves are. based on a rising stem design with cam and pin and a rotating plug with
retracting slips that assure low operating torques and friction-free opening and closing. The plug is double guided to assure that both slips seal equally on both sides.
Double Block & Bleed
Dual expanding plug valves have a double block and bleed function bothupstream and downstream which otherwise would require two separated valves to obtain the same effect. This does not only mean an easi er operation but also lower cost of maintenance and saving space.
Maintenance and Serviceability
Dual expanding plug valves are top and bottom entry type. If changing the slips is required, these can easily be
accessed by removing the lower cover without any special tools. The valve should be in open position to remove
the slips downwards.
Thanks to the back seat incorporated in our valves, stem packing can be adjusted and replaced easily, even if the line is under pressure.
The lower trunnion is not part of the plug but incorporated in the lower cover, thus eliminating a body cavity where accumulation of particles may interfere with the valve function.
Dual expanding plug valves are equipped with a full-size stem packing; special requirements
like TA-Luft or other regulations regarding fugitive emissions, including live loaded packing, can easily be fulfilled.
Dual expanding plug valves can be equipped with any type of actuator, including linear pneumatic ones.
Valve fully open.
Plug (red) is rotating.
Plug/slips have rotated 90°, the plug starts expanding the slips.
|4. Double Block and Bleed
Valve is seated.
|5. Start to open
Valve starts opening. The plug is moving up, retracting the slips from the body seats. Strong dovetail and stems retract the slips.
|6. Slips retracted
Slips have been retracted prior to rotation and rotate to open position.
(Further working as fig. 1 and 2 in reversed order)
- Tank Storage
- Loading/unloading Stations
- Multi-Product Manifolds
- Metering Stations
- Aviation fuel Services
- Custody Transfer Units
- Offshore Platforms