Top Entry Trunnion Mounted Ball Valve
Top-entry trunnion-mounted ball valves feature easy in-line maintenance. The top of the valve can be removed to gain access to the ball and seats without removing the entire valve from the piping system.
Top-entry trunnion-mounted ball valves are typically constructed of a cast-steel one-piece body with a bolted bonnet connection.
The Top Entry Trunnion Mounted Ball Valve is specially designed and developed for lower operating torque, easy maintenance, soft or metal seat, fire-safe, double block and bleed, bi-directional operation, and flexible design.
Features and Benefits
- Easy maintenaince. Removing the bonnet from the valve allows free access to the ball and the seats, which can simultaneously be taken out without the need for any special maintenance tools.
- The body bonnet design features bolted construction.
- One piece body
- The seats are always in contact with the ball to provide an effective, tight seal even at low differential pressures.
- Double block-and-bleed capability
- A body drain is provided in the body cavity's lowest part, with an NPT drain valve and a safety plug.
- Fire-safe design, anti-static device
- Emergency sealant injection fitting for seat and stem
- Low-friction,metal-backed,self-lubricating PTFE sleeve bearings and thrust washers
Options
- Forged steel body
- Metal-to-metal seat
- Double piston effect
- Low emission packing
- Extended bonnet
- Stainless steel or INCONEL 625 overlay on sealing areas
- Explosive decompression-resistant seals (standard for Class 600 and higher)
Drawing
Typical Material
| Item | Part Name | Material | Item | Part Name | Material |
| 1 | Body | A216 Gr. WCB | 3h | Washer | POM-C |
| 1a | Body Flange | A515 Gr. 70 | 3f | Washer | POM-C |
| 1c | Retainer Pin | AISI 420 | 4 | Stem | AISI 316 |
| 1g | Hollow Hex Plug | AISI 420 | 4c | O-ring Seal | Viton |
| 1j | Vent | AISI 420 | 4f | O-ring Seal | Viton |
| 2 | Seat ring | AISI 316 | 5a | Bolt | 8.8+GLV |
| 2b | Soft Seat | PTFE | 6 | Packing | Graphite |
| 2c | O-Ring Seal | Viton | 7c | O-Ring Seal | Fluorine Rubber |
| 2e | Spring | AISI 302 | 12a | Mounting Flange | A515 |
| 2j | Fire Safe Ring | Graphite | 13c | O-ring Seal | Fluorine Rubber |
| 3 | Trunnion Ball Solid | AISI 316 | 15 | Body Gasket | 316 + Graphite |
| 3c | Anti Static Device | AISI 316 | 16 | Bolt/Nut | A193 B7/A194 2H |
| 3g | Bearing | 316+ PTFE | 18 | Name plate | AISI 340 |
Leave Us Your Info
Could you please kindly fulfill the following information when enquiring:
Valve type (ball, gate, globe, check etc.), valve size, pressure class, valve material, and end connection (flanged, butt welding etc.)
