33 times the design pressure rating for the ball valves. For a DBB trunnion mounted ball valve, when the valve is in the closed position, and the fluid comes from upstream, it pushes the seat against the ball to release the sealing. Our products include ANSI Classes 150 – 2500 in carbon steel bodies with electroless nickel plating or stainless steel trim, as well as full stainless steel body and trim. This design provides a positive seal on both downstream and upstream seats, regardless of pressure, allowing for Double Block and Bleed, or Double Isolation and Bleed function. Gear Operated Trunnion Ball Valve. A separate field study tested valves with seat pockets manufactured using Alloy 316L – a molybdenum-bearing austenitic stainless steel – and ENP plating. Standard lengths: 48-, 60-, 72-, 84- and 96-inch (custom high-head lengths available upon request).
This is advantageous since it will maintain a proper seal on both sides and there is no added torque to the stem. They're designed to provide superior performance in a variety of applications, including offshore platforms, oil, gas, and other liquids pipelines, tank farms, meter stations, chemical processing plants and refineries. Series T Carbon Steel. A double block and bleed (DBB) is often used for stricter isolation of process fluid from other equipment. However, several critical projects need to vent at a pressure less than 1. Forum's valve manufacturing also leverages a wide variety of certified materials that resist sulfide stress cracking and increase performance in corrosive environments. ISO 15848-1 Compliance. NACE National Association of Corrosion Engineers. Figure 1: Free floating ball valve (left) and a trunnion mounted ball valve (right). High pressure applications. Trim: electroless nickel plating (316 stainless steel). ANSI Class 900 (2, 200 PSI WP). A trunnion mounted ball valve provides lower operational costs due to the fact that any additional pressure on the valve is absorbed by the trunnion and the stem. Trunnion-Mounted Ball Valves.
Pressure class: ANSI 150-2500. In low or no-pressure situations the spring-loaded seats will create a seal, while also working for high pressure applications. SP 45 Bypass and Drain Connection Standard. Advantages of a ball valve include Fast shut off, only a 90-degree turn required to close the valve. Therefore, for higher pressure applications a trunnion ball valve will provide better sealing and require less torque to turn. ISO 9001-2000 Quality Systems for Design/Development, Production, Installation, Servicing. Pinion shaft extension with gear and miter box, upright orientation. Body material: carbon steel (dual-rated A105/LF2). Forged Body Trunnion Mounted Ball Valves. In the trunnion valve design, the ball is not floating as it is connected to the trunnion. Extended valve life at a fraction of the cost of a solid corrosion-resistant alloy valve.
After extended hard use, field experts found no evidence of corrosion in the seat pockets or process-wetted area. High-head direct mount with two-inch square operating nut. Full or reduced port. Forum's full catalog of PBV valve solutions offer a variety of stainless steel and high-nickel alloy weld overlays for internal surfaces. Trunnion Ball Valve - How They Work. 4 Liquid Petroleum Transportation Piping Systems. It is necessary to vent/bleed the pressure when the pressure in the ball becomes high enough. A trunnion ball valve is designed by API608 or API 6D and complies with several other industry standards.
Firesafe to API-607/6FA. A ball valve uses a rotating ball and a stem to provide on/off flow control. Cost-effective options for ball valves in highly corrosive or erosive service. The most common type of ball valve has a "free floating" design, so the trunnion type is a design change. ANSI Class 150, 300, and 600. National Association of Corrosion Engineers (NACE)/fire-safe design. We offer a full range of materials in carbon, alloy and stainless steel from general to severe in application, including Sub Sea.
Our entire valve catalog offers easy field service and numerous options such as stem extensions, locking devices, transition pieces and direct-mounted actuation. Mill test reports are always available. 5 Steel Pipe Flanges and Flanged Fittings. The carbon steel balls with electroless nickel plating (ENP) were completely degraded from the heavy brine environment, while the Inconel overlay valves showed zero signs of pitting or corrosion. Size Range: 2" – 64". Lower operational costs. Materials: 316 stainless steel or Inconel nickel-chromium alloys. The Ball Valve provides tight seal, even after long periods, utilizing soft sealing components. Learn more about ball valves in our extensive ball valve guide. When the ball is rotated 90-degree, the bore becomes perpendicular to the flow path, meaning the valve is closed, and fluid cannot pass. 1 times the originally designed pressure.
The pressure within the ball rises when the temperature in the ball becomes higher. Onshore or offshore, Forum's PBV® tandem ball valves withstand the most hostile hydrocarbon operating environments and provide positive shutoff for enhanced safety. ISO International Organization for Standardization. The result is the highest-quality and most competitively-priced trunnion-mounted ball valve available. One seat seals the fluid from upstream, and the other seat seals the fluid from downstream. Tiger Valve Company (TVC) is a trunnion-mounted ball valve manufacturer for the TL and TB Series. The fluid remains trapped within the ball, which creates a resultant pressure in the ball. In one study, overlay and non-overlay valves were compared from the same worksite after six years of field service. Available in seat pocket, seal areas and all wetted parts. In addition, the torque on the stem is also increased.
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