Trunnion Mounted Ball Valve
Trunnion mounted ball valves are designed for upstream sealing. The load generated by the line fluid on ball is absorbed by the trunnion bearings and is directly transmitted to the valve body, and the upstream seat driven by medium pressure drifts towards the ball to creater reliable sealing. The seat design has a built-in automatic cavity relief mechanism.
Trunnion mounted ball valves have a bottom entry stem design, where the stem is inserted from inside the body. The higher the line pressure, the tighter the seal. An elastomer seal in the form of an o-ring is located at the lower end of the stem, which provides the first level of protection to the atmosphere. Valves are provided with vent and drain connections for venting/draining of the valve cavity. Vent and drain connections can also be used for on-line affirmation of valve sealing.
Features of Trunnion Mounted Ball Valves:
Trunnion Mounted Ball
Floating Spring Loaded Seat
Double Block and Bleed (DBB) Design Available
Split Body, End Entry
2-Piece or 3-piece Body
Full Port for Pigging Operation
Fire Safe to API 607
Gear Operation or Actuator Available
Applicable Standards of Trunnion Mounted Ball Valves:
A) Design & Manufacture: API 6D, BS 5351, API 607
B) Face to Face: API B16.10, API 6D, EN 558, DIN 3202
C) End Connection: ASME B16.5, ASME B16.25, EN 1092, JIS B2220
D) Test and Inspection: API 6D, EN 12266, API 598
Sizes: 2" - 48", DN 50 - DN 1200
Pressure Rating: Class150 - Class 2500 or PN 16 - PN 420
Material of valve body: WCB, LCB, CF3, CF8M, CF3M, A105, LF2, F304, F304L, F316, F316L etc.
Operated by: Lever, Gear, Pneumatic, hydraulic and Electric actuator
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1. Construction is as follows:
- Full Port or Reduce Port
|- Split Body|
|- Bolted Bonnet with spiral-would gasket|
|- Fire Safe Design|
|- Anti-static Design & Blow-out proof stem|
|- Double seat structure|
|- Butt Weld Ends to ASME B16.25|
|- Flanged Ends to ASME B16.5|
2. Main Part & Materials\
|Seat/Seat Ring||PTFE/RPTFE/NYLON/DEVLON/PEEK or METAL|
|Suitable Medium||W.O.G etc.||HNO3, CH3OOH etc.|
|Suitable Temperature||-29~425 °C||-46~340 °C||-46~340 °C||-196~427 °C||-196~427 °C||-196~427 °C||-196~427 °C|