Forged steel trunnion ball valve Manufacturer in China
This forged steel trunnion ball valve Two elastic sealing rings are installed on the valve seat ring. One of these sealing rings is loaded by a valve seat spring, causing the sealing surface of the ring to closely conform to the surface of the ball, thereby forming an initial seal.
When your gas pipeline runs at full differential pressure, seat sealing cannot rely on assembly preload alone. Our forged steel trunnion mounted ball valve turns line pressure into sealing force: the area difference across the seal ring generates a piston force that compresses the elastomer ring harder against the ball as pressure rises. This design helps you hold a reliable seal in natural gas service at maximum working pressure, without over-torquing the seats at assembly.
When abnormal pressure builds inside the valve cavity of a live gas line, the stem is the weakest point on an ordinary valve. Our forged steel trunnion mounted ball valve retains the stem structurally: the stem head is machined as a stepped boss and captured by the packing box itself, so retention never depends on gland load or packing condition. This design helps you keep the stem inside the body during cavity over-pressure, even if the gland loosens or the packing loses compression in service.
When you handle flammable or volatile media, static charge generated at the ball-to-seat interface is an ignition source you cannot leave to chance. Our forged steel trunnion mounted ball valve carries an anti-static device on the stem, creating a continuous bonding path from ball through stem to body so friction-generated charge drains as it forms. This design helps you avoid electrostatic discharge in chemical service, where a single spark at the seat is enough to ignite the medium
When you need reliable sealing performance for your oil industry applications, our forged steel trunnion mounted ball valve offers a fire-safe seat design worth considering. A composite fire ring of flexible graphite reinforced with stainless steel wire is fitted at the valve seat. If fire destroys the soft sealing ring, spring loading drives the seat ring against the ball through a piston effect on the body, establishing a metal-to-metal secondary seal. This design helps you keep hydrocarbon release under control in oil pipelines, even when the primary soft seal is burned away.
Automatic pressure relief structure of forged steel trunnion ball valve
When the valve is in the blocked-in condition – fully open or fully closed, with the medium completely stopped flowing – the trapped medium within the valve chamber has nowhere to go. The process or environmental temperature causes it to heat up, and the chamber pressure rises above the pipeline pressure. For ordinary valves, this pressure remains locked within the chamber until someone opens it. Our forged steel trunnion ball valve is designed to relieve the pressure in the valve chamber and offers two configurations to match the isolation function required by your pipeline
Your Trusted Forged steel trunnion ball valve Manufacturer in China
As a specialized manufacturer of gas valves, Longz has over 20 years of experience in designing and manufacturing valves. Among these, the gas ball valve series holds a 20% market share in the domestic market, with products widely used in industries such as petroleum, chemical, and natural gas.
This model Cast steel trunnion ball valve adopts high-standard industrial-grade material configuration, and can provide flexible material selection plans according to different working conditions. The valve seat is provided with PTFE, VITON and metal, and PFTE / graphite packing and 304 + graphite winding gasket are matched to ensure excellent sealing performance.
The force seal ball valve, with its unique structure, adopts a new technological design featuring a rotating core separation opening mechanism and mechanical pressure sealing. Its most prominent advantage is that the sealing surface does not generate friction. It features a long service life and low operating torque. Even under harsh conditions where the fluid medium contains impurities such as solid particles, sand, or short fibers, and requires high-speed concentrated flushing of sealing components, it can maintain excellent sealing performance, ensuring safe and reliable operation during the maintenance period of engineering equipment.
The advanced spherical valve body and longitudinal single welded combination structure design provides the valve with sufficient stiffness and strength, some overcoming the stress caused by construction and terrain changes.
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- Dimension Chart for Forged Steel Trunnion Ball Valve
| DN | NPS | L(RF) | L1(BW) | handle MA | The turbine is rotating. GA | C | H | ||
|---|---|---|---|---|---|---|---|---|---|
| M | M0 | G | G0 | ||||||
| Full bore diameter PN16/PN20/Class150 | |||||||||
| 50 | 2 | 178 | 216 | 161 | 250 | – | – | 105 | 100 |
| 65 | 2.5 | 191 | 241 | 178 | 300 | – | – | 130 | 110 |
| 80 | 3 | 203 | 283 | 189 | 350 | 185 | – | 155 | 125 |
| 100 | 4 | 229 | 305 | 214 | 500 | 235 | 280 | 200 | 160 |
| 150 | 6 | 394 | 457 | 265 | 800 | 325 | 280 | 250 | 185 |
| 200 | 8 | 457 | 521 | – | – | 390 | 300 | 278 | 222 |
| 250 | 10 | 533 | 559 | – | – | 445 | 400 | 323 | 280 |
| 300 | 12 | 610 | 635 | – | – | 520 | 400 | 340 | 303 |
| 350 | 14 | 686 | 762 | – | – | 550 | 500 | 375 | 330 |
| 400 | 16 | 762 | 838 | – | – | 580 | 500 | 410 | 355 |
| 450 | 18 | 864 | 914 | – | – | 605 | 600 | 440 | 390 |
| 500 | 20 | 914 | 991 | – | – | 610 | 600 | 495 | 460 |
| 550 | 22 | 991 | 1092 | – | – | 670 | 600 | 525 | 475 |
| 600 | 24 | 1067 | 1143 | – | – | 725 | 600 | 585 | 520 |
| 650 | 26 | 1143 | 1245 | – | – | 760 | 700 | 630 | 560 |
| 700 | 28 | 1245 | 1346 | – | – | 790 | 700 | 645 | 650 |
| 750 | 30 | 1295 | 1397 | – | – | 825 | 700 | 690 | 700 |
| 800 | 32 | 1372 | 1524 | – | – | 870 | 700 | 740 | 745 |
| 850 | 34 | 1473 | 1626 | – | – | 910 | 700 | 760 | 775 |
| 900 | 36 | 1524 | 1727 | – | – | 950 | 700 | 810 | 805 |
| 1000 | 40 | 1753 | 1956 | – | – | 1005 | 700 | 895 | 900 |
| 1050 | 42 | 1790 | 2083 | – | – | 1045 | 700 | 950 | 935 |
| 1200 | 48 | 1995 | 2388 | – | – | 1235 | 800 | 1095 | 1070 |
| 1400 | 56 | 2489 | 2489 | – | – | 1450 | 800 | 1300 | 1250 |
| 1500 | 60 | 2640 | 2640 | – | – | 1550 | 1000 | 1380 | 1350 |
| 1600 | 64 | – | – | – | – | – | – | – | – |
After thoroughly understanding and analyzing our actual operating conditions, specific media characteristics, and stringent sealing requirements, Longz, drawing on extensive industry experience and product application data, recommended this model.forged steel trunnion ball valve，This valve demonstrates excellent performance in terms of wear resistance and corrosion resistance, effectively meeting all operational requirements on our site. Consequently, its overall performance is highly compatible with our actual application scenarios
Procurement ManagerAmerican Gas CompanyThis forged steel trunnion ball valve provided by Longz exhibits extremely stable and reliable sealing performance. During the actual operation over the past year, we have not observed any signs of leakage, fully verifying the durability and effectiveness of its sealing structure under long-term use conditions. At the same time, this valve also implements robust designs for preventing stem blowout and static electricity prevention. These two key safety designs have played a significant role in practical applications, further enhancing the overall safety and operational reliability of valves in high-pressure conditions as well as in high-risk environments such as flammable and explosive settings
EngineerFrench machinery company
The applicable temperature range for this forged steel trunnion ball valve is from -29℃ to +121℃.
Under fire conditions the valve achieves Class VI leakage via the composite fire ring (flexible graphite + stainless steel wire).
Yes, this design includes an automatic cavity unloading device.
These are the requirements of API 6D for forged steel trunnion ball valves: pressure from liquid thermal expansion or trapped air cavities caused by fire, which may otherwise lead to overpressure and rupture of the valve body.
Forged steel trunnion ball valve: full bore structure and reduced bore structure
To meet the diverse needs of users, forged steel trunnion ball valves are available in two series: full bore and reduced bore. The flow channel inner diameter of the full-bore ball valve series matches the pipe’s inner diameter, facilitating pipeline cleaning; The reduced-diameter series of ball valves have smaller volumes and lighter weights compared to the full-diameter series. Therefore, the reduced-diameter series of ball valves are widely applied and hold promising prospects. Depending on the actual operating conditions of the ball valve, media requirements, sealing requirements, etc., you can choose whether to include an auxiliary sealing device. The auxiliary sealing device is a check valve installed on the exterior of the valve body, which prevents media leakage but can also inject sealing grease under external force. When auxiliary sealing requirements are present, grooves and ports for grease injection are designed and machined on the valve seat ring, connecting to the auxiliary sealing device. By injecting sealing grease through the auxiliary sealing device, a seal is formed between the valve seat and the ball, thereby preventing media leakage.