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Ball Valves

Worm Gear Trunnion Mounted Ball Valve

  • Worm Gear Actuation, Effortless Operation: Utilizes a worm gear mechanism to effectively amplify torque, significantly reducing the force required for manual operation, ideal for opening/closing large-diameter or high-pressure valves.
  • Trunnion Mounted Ball, Low Torque: The ball is supported by upper and lower trunnions, resulting in low operating torque under high pressure, extending the service life of valve seats.
  • Self-Locking Function, Precise Control: The worm gear mechanism typically offers good self-locking performance, preventing accidental movement of the valve in any position, enabling precise flow regulation or complete shut-off.
  • Reliable Sealing Performance: Features a spring-loaded floating seat design, ensuring reliable fluid blockage by both upstream and downstream seats when the valve is fully open or closed, achieving bidirectional sealing.
  • Fire-Safe and Anti-Static: Equipped with a fire-safe structure to maintain effective sealing during a fire. An integrated anti-static device prevents static electricity accumulation.
  • Automatic Pressure Relief: The valve's body cavity features an automatic pressure relief function, where seats retract to release pressure if cavity pressure abnormally rises, protecting the valve.
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The Worm Gear Trunnion Mounted Ball Valve is a trunnion-mounted ball valve operated via a worm gear mechanism. This design is particularly suitable for large-diameter or high-pressure valves requiring significant operating torque, as the worm gear transmission significantly reduces the force needed for manual operation, making valve opening and closing more effortless and smooth. Its trunnion-mounted ball design ensures stability and low operating torque under high differential pressures, while the worm gear mechanism often includes a self-locking feature to prevent accidental movement and enable precise control. This valve is widely used in industries such as oil & gas, chemical, and power generation for shut-off or flow control of various media.

Materials of Parts

No. Part Name Carbon Steel ASTM Material (18Cr-9Ni-2Mo) Carbon Steel (LT)
1 Body A216-WCB A351-CF8M A352-LCB
2 Bonnet A216-WCB A351-CF8M A352-LCB
3 Ball A182-F304¹ A182-F316 A182-F304¹
4 Stem A276-304 A276-316 A276-304
5 Seat A105+ENP A182-F316 A350-LF2+ENP
6 Seat Insert - Glass Filled PTFE -
7 Seat Spring A313-304 Inconel X-750 A313-304
8 Seat O-Ring NBR Viton Viton
9 Stem O-Ring NBR Viton Viton
10 Bonnet Gasket Graphite+304¹ Graphite+316² Graphite+304²
11 Bonnet O-Ring NBR Viton Viton
12 Antistatic Spring A313-304 A313-316 A313-304
13 Grounding Plunger A216-WCB A182-F316 A182-F304
14 Bonnet Stud A193-B7 A193-B8 A320-L7
15 Bonnet Stud Nut A194-2H A194-8 A194-4
16 Trunnion A276-304 A276-316 A276-304
17 Trunnion Bearing 304+PTFE 316+PTFE 304+PTFE
18 Gland Flange A216-WCB A351-CF8M A352-LCB
19 Gland Bolt A193-B7 A193-B8 A193-B7
20 Stop Plate Carbon Steel Carbon Steel+Zn Carbon Steel
21 Handle Carbon Steel Carbon Steel Carbon Steel
Note: 1) A105+ENP optional; 2) Spiral wound construction.

Dimensions Data (ANSI Class 600Lb)

NPS (in) DN (mm) L(RF) L1(BW) H (d) W
2 50 11.50 11.50 7.12 - 14
2 1/2 65 13.00 13.00 7.62 - 16
3 80 14.00 14.00 8.50 - 20
4 100 17.00 17.00 9.50 - 20
6 150 22.00 22.00 21.25 - 24
8 200 26.00 26.00 25.00 - 24
10 250 31.00 31.00 26.12 - 24
12 300 33.00 33.00 31.12 - 24
14 350 35.00 35.00 31.88 - 32
16 400 39.00 39.00 36.38 - 32
18 450 43.00 43.00 38.75 - 32
20 500 47.00 47.00 44.50 - 32
24 600 55.00 55.00 46.62 - 32
26 650 57.00 57.00 52.50 - 32
28 700 61.00 61.00 57.00 - 32
Dimension 'L/L1/H/W' unit is inch, 'd' unit is mm.

No drawing available.