Products
Twin Seal DBB Plug Valve Orbit Dual Expanding General Valve
✧ Description
The valve body of our Twin Seal DBB Plug Valve Orbit Dual Expanding General Valve includes valve body, valve plug, valve disc (embedded in main sealing ring), end cover, chassis, packing and other main components. The valve core and disc are the core of the valve body part. The valve plug is fixed in the valve body with the upper and lower trunnions, the flow channel opening is in the middle, and the two sides are wedge-shaped surfaces. The wedge face mill has dovetail guide rails that are attached to two discs on both sides. The disc is the main sealing element and has a cylindrical surface. Accuracy of Class B hard seal can be achieved. The cylindrical surface is milled with a groove circle, and the main sealing ring is permanently embedded with fluorine rubber or nitrile rubber, etc. by molding and vulcanization, which plays the role of hard sealing and soft sealing when the valve is closed.
The DBB Plug Valve (double block and bleed plug valve) also named GENERAL VALVE, Twin Seal plug valve. this constant wear by using two seating slips mounted independently on a tapered plug by dovetails, which mechanically retract from the seating surface prior to rotating. This provides a bubble-tight verifiable dual seal without seal abrasion.
The manipulator is mainly composed of signs, hand wheel, spindle bushings, ball pins, brackets and other components, which are fixed on the end cover and connected with the spool rod by connecting pins. The manipulator part is the actuator of the action. Close the valve from the open position, turn the hand wheel clockwise, the valve core rotates 90° first, and drives the valve disc to rotate to the valve body flow channel position. Then the valve core moves down in a straight line, driving the valve disc to expand radially and approach the inner wall of the valve until the soft seal is pressed into the groove, so that the surface of the valve disc is in contact with the inner wall of the valve.
Open the valve from the closed position, turn the handwheel counterclockwise, the valve core first moves straight up, and then rotates 90° after reaching a certain position, so that the valve is in a conducting state.
✧ Features of Twin Seal DBB Plug Valve Orbit Dual Expanding General Valve
1. During the valve switching process, the valve body sealing surface does not have any contact with the sliding plate sealing surface, so the sealing surface has no friction, wear, long service life of the valve and small switching torque;
2. When the valve is repaired, it is not necessary to remove the valve from the pipeline, just disassemble the bottom cover of the valve and replace a pair of slides, which is very convenient for maintenance;
3. The valve body and cock are reduced, which can reduce the cost;
4. The inner cavity of the valve body is plated with hard chromium, and the sealing area is hard and smooth;
5. The elastic seal on the slide is made of fluorine rubber and moulded in the groove on the surface of the slide. The metal to metal seal with fire protection function is used as the backing of the elastic seal;
6. The valve has an automatic discharge device (optional), which prevents abnormal pressure increase in the valve chamber and checks the effect of the valve after the valve is completely closed;
7. The valve switch indicator is synchronized with the switch position and can accurately display the switch status of the valve.
✧ Parameters of Twin Seal DBB Plug Valve Orbit Dual Expanding General Valve
| Product | Twin Seal DBB Plug Valve Orbit Dual Expanding General Valve |
| Nominal diameter | NPS 2”, 3”, 4”, 6”, 8”, 10”, 12”, 14”, 16”, 18”, 20”, 24”, 28”, 32”, 36”, 40”, 48” |
| Nominal diameter | Class 150, 300, 600, 900, 1500, 2500. |
| End Connection | Flanged (RF, RTJ) |
| Operation | Handle Wheel, Pneumatic Actuator, Electric Actuator, Bare Stem |
| Materials | Casting: A216 WCB, A351 CF3, CF8, CF3M, CF8M, A352 LCB, LCC, LC2, A995 4A. 5A, Inconel, Hastelloy, Monel |
| Structure | Full or Reduced Bore, |
| RF, RTJ | |
| Double Block & Bleed (DBB)，Double Isolation & Bleed (DIB) | |
| Emergency seat and stem injection | |
| Anti-Static Device | |
| Design and Manufacturer | API 6D, API 599 |
| Face to Face | API 6D, ASME B16.10 |
| End Connection | RF, RTJ (ASME B16.5, ASME B16.47) |
| Test and Inspection | API 6D, API 598 |
| Other | NACE MR-0175, NACE MR-0103, ISO 15848 |
| Also available per | PT, UT, RT,MT. |
| Fire safe design | API 6FA, API 607 |
✧ After Sale Service
As a professional forged steel valve manufacturer and exporter, we promise to provide customers with high-quality after-sales service, including the following:
1.Provide product usage guidance and maintenance suggestions.
2.For failures caused by product quality problems, we promise to provide technical support and troubleshooting within the shortest possible time.
3.Except for damage caused by normal use, we provide free repair and replacement services.
4.We promise to respond quickly to customer service needs during the product warranty period.
5. We provide long-term technical support, online consulting and training services. Our goal is to provide customers with the best service experience and make customers' experience more pleasant and easy.
