Trunnion Ball Valve
Trunnion Ball Valve
Advantages of the trunnion mounted ball valve
- The structure of a trunnion ball valve is relatively simple, making it easy to install and maintain. No need to replace parts frequently, which can effectively reduce the operation cost.
- It has a compact structure and good sealing performance. It can withstand relatively high pressure, so is suitable for the control of high-pressure fluids.
- It can rotate along the center line of the valve body, enabling high accuracy in flow control.
- With a compact structure and good sealing performance, the fixed ball valve is less likely to have malfunctions such as leakage. It can operate stably and improve production efficiency.
- The trunnion mounted ball valve is a new generation of high-performance ball valve, which is suitable for long-distance pipelines and general industrial pipelines. Its strength, safety, and resistance to harsh environments have been specially considered during the design process. It is suitable for various corrosive and non-corrosive media.
- EMERGENCY STEM SEALANT INJECTION: This standard feature allows the valve’s stem housing to be adapted with a grease fitting to inject sealant during emergency scenarios, providing protection against unplanned spikes in operating conditions.
- EMERGENCY SEAT SEALANT INJECTION: This optional feature allows the valve’s end connections to be adapted with a grease fitting to inject sealant. This creates a positive seal in the case of seat leakage due to service impurities or unplanned spikes in operating conditions.
- DRAIN AND VENT PORTS: Drain ports located at the bottom of the valve release any fluid trapped in the body cavity of a closed valve. Vent ports located at the top of the body cavity eliminate any gas trapped in the body cavity of a fully closed valve. Both play a key safety role in the double block and bleed and/or double isolation and bleed valve configurations.
- DOUBLE BLOCK AND BLEED: This safety feature eliminates the buildup of pressure due to high-pressure media trapped in the valve’s body cavity, even while the valve is in the fully closed position.
- FIRE SAFE DESIGN: Secondary metal seat design provides a fire-safe shut-off per API 607. Additionally, secondary graphite body seals and flexible graphite packing prevents leakage through the body joints and stuffing box, respectively.
- INTERNAL TRUNNION DESIGN: Upper and lower bearing plates hold the ball in place, preventing the ball from floating axially and avoiding excess load on the seats. External trunnion design is available in certain sizes.
- PRESSURE ENERGIZED STEM PACKING: Our proprietary energizer ring, located above the primary o-ring stem seal, provides insurance in the rare event that the O-ring is damaged by using the media pressure to create an upward compressive force on the packing. This upward force on the packing combined with the downward compressive force created by tightening the packing gland results in a larger net compressive force on the packing and a better seal than a typical packing design.
- DOUBLE SEALS ON BODY JOINTS: Primary elastomeric seals ensure zero leakage in standard operating conditions. Secondary graphite seals ensure proper body joint sealing per API 607 in extreme temperature scenarios.
- ANTI-STATIC DEVICES: Standard anti-static devices ensure electrical continuity between the ball, stem, and body, eliminating the possibility of sparks within the valve created by static electrical charges.
- VALVE POSITION INDICATION: Clear stamping on the outer diameter of the mounting flange identifies the open or closed position of the valve based on the stem key orientation.
- BLOWOUT-PROOF STEM DESIGN: Valves are designed with stem/body connection to prevent stem blowout under line pressure.
Technical Specifications
| SIZE RANGE | From 2” – 48” |
| PRESSURE RANGE | ANSI 150# – ANSI 2500# |
| MATERIAL GRADES | WCB, A105N, A182-F316 SS, A350-LF2, A350-LF6, and F51 Duplex |
| PORT SIZES | Full Bore, and Reduced Bore |
| TRIM MATERIALS | 3MIL ENP, 316SS, and F51 Duplex |
| SEAT INSERT MATERIAL | Devlon (PEEK and others available upon request) |
| SEAL MATERIALS | HNBR 90 DURO, James Walker 101/985, FKM GLT, and AFLAS |
| END CONFIGURATIONS | Raised Face (RF), Ring Type Joint (RTJ), Butt Weld (BW), and Flanged X Butt Weld |
| STANDARD FEATURES | Anti Static device; Anti Blowout Stem; Pressure relief valve to avoid cavity overpressure when applicable; Emergency built-in stem and seat sealant injection system; Fire Safe in accordance with API 607; MR-0175 NACE compliant; Fugitive Emissions compliant. |
| SEAT DESIGN FEATURES | Double Piston Effect, Self Relieving, Combination of options available |
| VALVE FUNCTIONALITY | Double Block and Bleed (DB&B), Double Isolation and Bleed (DIB-1 or DIB-2) |
| DESIGN STANDARDS | B16.34, B16.10, B16.5, B16.25, B16.47, Firesafe, Low Emissions Compliant, CSA Z245.15.2017 |
The data is for reference only, please consult andy@vokkan.com for details.
Applications of Trunnion Ball Valves
- Oil and gas industries
Trunnion ball valves are perfect for a wide range of applications in several oil and gas industries. Examples of oil and gas industries that utilize trunnion ball valves include gas feed lines, field gas plants, industrial gas processing plants, oil refinery feedstock lines, and crude oil plants. - Pipeline industries
The ability of trunnion ball valves to handle several different applications such as gasses, slurries, and liquids makes them highly valuable in the pipeline industry. - Hydrocarbon industries
Because trunnion ball valves are useful for the facilitation of hydrocarbon processing, they are extremely popular among hydrocarbon industries. - Power Industries
Trunnion ball valves are suitable for numerous applications such as turbines, skids, generators, and compressors which are integral to the operation of power industries. - Chemical industries
Offering incredible safety, durability, and sealing capabilities, trunnion ball valves suit a wide variety of chemical industries where such competencies are imperative.
What is a Trunnion Ball Valve?
The trunnion ball valve is mainly composed of parts such as the valve body, ball, sealing ring, and driving device.
Similar to the floating ball valve, it has two seat sealing rings at the inlet and outlet. The ball core in the middle is fixed to the valve body through the upper valve stem and the lower valve stem. The opening and closing actions of the ball core can only be driven by the rotation of the valve stem. It cannot move towards the outlet direction like the floating ball valve, because the upper and lower valve stems restrict the movement of the ball core. That’s why it is also called a fixed ball valve.
Its working principle is as follows:
When the valve is closed, under the action of the valve body, the ball makes close contact with the sealing ring, preventing the medium from passing through.When the valve is opened, the driving device drives the ball to rotate, making it move away from the sealing ring, thus enabling the circulation of the medium.
Its sealing performance mainly depends on the cooperation between the ball and the sealing ring. When the ball makes close contact with the sealing ring, it can effectively prevent the leakage of the medium. At the same time, the driving device of the fixed ball valve can adopt an electric or pneumatic mode, which is simple to operate and easy to control. ball valve is mainly composed of parts such as the valve body, ball, sealing ring, and driving device.
ENQUIRY
