Customization of cast steel trunnion ball valve

High-performance fixed ball valve series, with strong strength, good sealing, maintenance-free, long service life.
The standards adopted are: national standard, American standard, Japanese standard, industry standard, etc. The products are widely used in various industries.

Cast steel trunnion ball valve Manufacturer in China

This product 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.

Application scenarios Cast steel trunnion ball valve

Natural gas

cast steel trunnion ball valve The housing is rigid, strong, and defect-free, with reliable sealing performance. Even after multiple opening and closing operations under maximum pressure difference (full pressure difference), it can still maintain a leak-free seal, ensuring safe use in natural gas transport pipelines.

Oil

Fire-safe structures can be provided in accordance with API 607 and API 6FA. Each valve seat is equipped with a composite fire-resistant ring made of flexible graphite and stainless steel wire; After a fire damages the elastomer sealing ring, the spring-loaded mechanism, through the valve body piston effect,

gas

The stem head of the cast steel trunnion ball valve is designed in a stepped structure with a protruding platform. The packing box secures the stem head firmly, ensuring that when abnormal pressure increases within the valve chamber, the stem will not eject. When operating valves, friction between the ball and the valve seat generates static electric charges that accumulate on the ball. To prevent static sparks, an anti-static device is installed on the valve stem to discharge the accumulated charges from the ball.

Chemical

When abnormal pressure increase occurs in the central chamber of a cast steel trunnion ball valve, the single-piston effect valve seat ball valve possesses an automatic pressure relief function; The ball valve with a special dual-piston effect seat performs automatic pressure relief through an additional pressure-relief device installed on the valve body.

The multi-stage sealing structure of the valve stem.

The valve stem achieves multi-stage sealing through an “O” ring seal, flexible graphite packing, and the injection of sealing grease: ” The O-ring seal achieves the first-level sealing of the valve stem; The replaceable flexible graphite packing achieves the second-stage sealing of the valve stem through compression via the packing compression sleeve and packing flange.On the packing box, an auxiliary sealing device—a valve stem greasing valve—is installed. It is designed with a greasing port and a greasing groove that are connected to the valve stem greasing valve. By injecting sealing grease through the valve stem greasing valve, third-level sealing at the valve stem is achieved.

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Your Trusted cast steel trunnion ball valve Manufacturer in China

Longz has more than 400 production and testing equipment such as large horizontal machining center and vertical machining center. CAD valve design center, three-dimensional simulation manufacturing design system, valve testing center and test platform have been set up to optimize product structure and ensure the quality and speed of new product development and production.

various types of Our Cast steel trunnion ball valve

forged steel trunnion ball valve

Reliable sealing performance, even after many switching actions under the maximum pressure difference (full pressure difference), it can still maintain sealing without leakage, ensuring safe use in conveying

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fully welded ball valve

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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One-stop solution for cast steel trunnion ball valve

We have a 24-hour after-sales service hotline. We will respond immediately to the quality problems reported by buyers. After-sales service personnel will make substantive responses and rush to the scene in the shortest time.

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Certifications
Technical Parameter Table for Cast Steel Trunnion Ball Valve

Diameter		L(RF)		H1	H2	W1	W2	F
INCH	mm
2-Piece Body
2″×1 1/2″	50×40	216	178	73.5	135	–	*280	–
2″	50	216	178	81	135	–	*280	–
3″×2″	80×50	283	203	81	143	–	*280	–
3″	80	283	203	104	173	–	*400	–
4″×3″	100×80	305	229	104	173	–	*100	–
4″	100	305	229	130	238	–	*650	–
6″×4″	150×100	394		130	238	–	*650	–
6″	150	394		260	340	400	450	180
8″×6″	200×150	457		260	340	400	450	180
8″	200	457		300	389	400	600	350
10″×8″	250×200	533		300	389	400	600	350
10″	250	533		325	405	400	600	350
12″×10″	300×250	610		325	405	400	600	350
12″	300	610		365	455	400	700	517
14″×12″	350×300	686		365	455	500	700	517
14″	350	686		400	490	500	700	517
3-Piece Body
16″×14″	400×350	762		400	490	500	700	517
16″	400	762		440	550	500	700	573
18″×16″	450×400	864		440	550	500	700	573
18″	450	864		500	620	600	700	573
20″×18″	500×450	914		500	620	600	700	573
20″	500	914		555	680	600	700	573
24″×20″	600×500	1067		555	680	600	700	573
22″	550	1016		635	806	600	700	696
24″	600	1067		700	870	600	700	696
26″	650	1143		720	890	600	700	696
28″×24″	700×600	1245		700	870	600	700	696
28″	700	1245		780	955	600	700	745
30″×24″	750×600	1295		700	870	600	700	696
30″	750	1295		825	1010	600	700	745
36″×30″	900×750	1524		825	1010	600	700	745
32″	800	1372		850	1050	600	700	830

This cast steel trunnion ball valve… The fire protection design is manufactured in strict accordance with API 607 and API 6FA standards. From material selection to structural design, every aspect has undergone rigorous testing and verification, fully meeting the sealing performance requirements in high-temperature flame environments. This gives me great confidence
Procurement Manager
Saudi Natural Gas Company
The sealing performance of this cast steel trunnion ball valve from Longz is extremely stable. After one year of actual use, I have not encountered any leakage. At the same time, their valve stem anti-blowout design and anti-static design are also exceptionally well-executed, further enhancing the safety and reliability of the valves in high-pressure and flammable/explosive environments
Engineer
German Machinery Manufacturing Company

What is the applicable pressure of your cast steel trunnion ball valve?

PTFE RPTFE:150Lb-600Lb

DEVLON:150Lb-2500Lb

NYLON:150Lb-2500Lb

VITON: 150Lb-900Lb

PEEK:150Lb-2500Lb

Do you have a full-diameter structure and a reduced-diameter structure for your cast steel trunnion ball valves?

In order to meet the different needs of users, there are two series of ball valve products: full diameter and reduced diameter. The flow channel diameter of the full-diameter series ball valve is the same as the diameter of the pipeline, which is convenient for pipeline cleaning; the volume and weight of the reduced-diameter series ball valves are smaller and lighter than those of the full-diamter series ball valves, so the application of the reduced-diamter series ball valve is very extensive and the prospect is very broad.

Do you have anti-static structures on your cast steel trunnion ball valve?

Anti-static devices are installed on the valve and valve stem of cast steel trunnion ball valve to discharge the charge accumulated on the ball.

What is your temperature range?

This cast steel ball valve is suitable for -29 ~ 427 ℃.

What is the material of your sphere?

The ball material of the forged steel ball valve is A105 and LF2, you can choose according to your working condition.

Design of Fire-Resistant Sealing Structure for Cast Steel Fixed Ball Valves: From Composite Fire-Resistant Rings to Zero Leakage

cast steel trunnion ball valve A composite fire-proof ring composed of flexible graphite and stainless steel wire is set on the seat of the valve, and when the soft sealing ring is burned and damaged by fire, the fire-proof ring and seat ring of the ball valve seat form a piston structure with the valve body through spring loading, The metal sealing surface of the valve seat ring is pushed towards the surface of the ball, so that the metal sealing surface of the seat ring is closely attached to the surface of the ball to form a seal, preventing a large amount of medium from leaking from the seat, preventing the further expansion of the fire, and the leakage level meets the VI level requirements.

Cast steel trunnion ball valves The sealing gasket of the bolt-connected valve body and valve cover adopts a fire-resistant flexible graphite gasket with stainless steel wire, and the sealing gasket is compressed by bolts. Finally, the metal-to-metal contact between the valve body and the valve cover ensures that the valve can withstand higher loads (Figure 7), and also improves the fire safety of the valve. And because the valve body and the valve cover are welded structures, the fully welded ball valve fundamentally eliminates the possibility of external leakage of the valve shell, and there will be no leakage even in severe fire situations.

The valve body and packing box connection gasket adopts fire-resistant flexible graphite with stainless steel wire gasket, and the valve stem packing adopts flexible graphite, ensuring that the ball valve has no external leakage in case of fire.

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