The Twin Seal Plug Valve is a type of valve used primarily in the oil and gas industry for isolating and controlling the flow of fluids. It is designed to provide a double block and bleed (DBB) function, which ensures a high level of sealing integrity and safety. The valve has two independent sealing surfaces that provide a reliable seal on both sides of the valve. This allows for the isolation of the pipeline section and the ability to bleed off any trapped pressure between the seals. The sealing surfaces are typically metal-to-metal, providing a durable and reliable seal that can withstand high pressures and temperatures. The valve can handle flow in both directions, providing flexibility in pipeline design and operation.
Design, dimensions and marking according to:
Design as per API 599 & API 6DFace to face as per ANSI b16.10& API 6DFlanged ended as per ANSI B16.5 / EN-1092-1
Construction:
3 Parts construction: body, lower plate, upper plateTrunnion mountedAntistatic design Seating slips (slips are replaceable through the lower or upper plate)Reduce bore or full boreLow emission packing & gaskets according to ISO 15848-1
Features:
1. Double Block & Bleed and Double Isolation (according to API-6D/ISO14313)
The KFTE Twin Seal Plug Valve provides two seating surfaces, each of which, seal to both directions. When the valve is in closed position, each individual seal is fully isolating not allowing any leakage, either from downstream or upstream or from the body cavity. In case of body cavity overpressure, venting/bleeding is provided by a thermal relief. Therefore the downstream pipeline is fully isolated from upstream pressure without the need for pressure balancing
2. Innovative lower trunnion design
The KFTE Twin Seal Plug Valve has a special designed lower trunnion, which prevents accumulation of particles and dirt in the lower part of the valve body. This accumulation could otherwise cause malfunction of the plug-system.
3. Back seat design
In case of stem-leakage the special “back seat” design provides the possibility to re-adjust the packing-gland or add additional gland packing-rings during field operation.
4. Slips design
The special slip-design provides the KFTE Twin Seal Plug Valve a unique sealing-system. The primary seal is an elastomer which is fully vulcanized on to the metal. An additional safety seal is achieved by a metal-to-metal contact between the metal-slip and internal valve-body. The sealing and contact area of valve-body is fully ENP-coated ensuring a corrosion-free contact with the slips.
5. Body Bleed & Thermal Relief
The KFTE Twin Seal Plug Valve must always be bled in closed position. Bleed outlet should be plumbed for drainage to a reservoir. This system includes a thermal relief valve in order to relieve pressure build up which might occur in the body cavity from thermal expansion.
| Material Specification | |
| NO. | DESCRIPTION |
| 1 | BODY |
| 2 | BOTTOM COVER |
| 3 | BEARING |
| 4 | DRAIN VALVE |
| 5 | O-RING |
| 6 | FIRE-SAFE GASKET |
| 7 | STUD |
| 8 | NU T |
| 9 | PLUG |
| 10 | DISC |
| 11 | TOP COVER |
| 12 | SEALING RING |
| 13 | STEM |
| 14 | O-RING |
| 15 | FIRE-SAFE PACKING |
| 16 | YOKE |
| 17 | TRANSMISSION SLEEVE |
| 18 | TRAMISSION AXIS |
| 19 | PIN AXIS |
