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Product Introduction
The Gearbox Butt-Welded DN150 3-PCS Metal Trunnion Ball Valve is a premium isolation solution engineered for heavy-duty service in pipelines, process systems and demanding industrial applications. With a three-piece body design and a fixed (trunnion) ball support, the valve offers excellent performance under high pressures, high temperatures and challenging conditions. The gearbox operator enables smooth, controlled actuation of the valve in larger sizes or where manual torque would otherwise be excessive.
Product Specifications
Applicable Standards:
Ball Valve design according to API6D,BS5351,ASME B16.34
Face to face ASME B16.10,AP6D
End Flanges ASME B16.5/ASME B16.47
Butt welded ends ASME B16.25
Fire Safety API607,API6A
Inspection and test API 598,API6D
Material: 09G2S
Size Range: 2"~48"
Pressure Rating: ASME CL, 150, 300, 600
Design Description:
- Structure : 2 pieces or 3 pieces body
- High shut-off sealing mechanism and low torque operation
- Block and bleed function
- Self-cavity pressure relief
- Fire safe design
- Blow out proof stem construction
- Anti-static design
- Locking device (for lever handle operation)
- ISO 5211 actuator mounting
- Emergency grease injection (option)
- PN design can be available
| Brand | DIDTEK |
| Structure | Ball |
| Valve Material | Didtek provide cast steel, stainless steel, special alloy, CI, DI etc |
| Valve Type | Didtek Produce Ball Valve |
| Valve Test | 100% quantity tested before delivery |
| Valve Guarantee | 18 months after shipments and 12 months after installed |
| Valve Structure | Tunnion Mounted Ball Valve |
| Valve Delivery | 15 - 30 days |
| Valve Sample | Sample Available by Didtek Valve |
| Valve Color | Customer request |
| Valve Packing | Plywood Case for Ball Valve |
| MOQ | 1 Set |
| Valve Certificate | API6D/CE/ISO9001/ISO14001 |
| Place of Origin | Zhejiang, China (Mainland) |
| Delivery Detail: | Shipped in 15-30 days after payment |
| Port | Shanghai Or Ningbo |
| Payment Terms | L/C,D/A,D/P,T/T, Western Union |
Key Features
3-piece body construction (two end caps + central body), allowing easier maintenance and servicing without full removal of the valve from the pipeline.
Trunnion-mounted ball: ball anchored top and bottom so that seat load is independent of line pressure, providing lower operating torque and reliable shut-off.
Butt-weld ends (BW) on both sides for minimal leak path and full‐pipeline integration, ideal for permanent welded connections.
Gearbox operator (manual gear) for DN150 size to enable safe, ergonomic operation in larger bore / higher torque applications.
Metal-seated design (metal to metal contact) for robust performance in high‐temperature, high‐pressure or erosive/abrasive services.
Certified for industry standards (e.g., compliance with API 6D, ISO/ASME standards).
Fire-safe construction and anti-static/trapped cavity relief provisions for enhanced safety.
Options for full bore or reduced bore for flow and cost optimization.
Gearbox drive offers mounting pad (ISO 5211) adaptability for automation or motorisation if required.
With trunnion mount and metal-to-metal seating, the valve delivers tight shut-off under high pressure. The body cavity relief, double block & bleed function and fire safe design further increase system integrity.
Metal seats, special alloys, and fire-safe / anti-static designs make this valve suitable for oil & gas, petrochemical, power generation and other critical industries.
FAQ
Q1: What is “3-PCS” body design?
A: It means the valve body is composed of three main pieces—the central body and two end-caps. This design allows easier servicing of the internal parts without removing the entire valve from the line.
Q2: What does “trunnion ball” mean and why is it beneficial?
A: A trunnion ball valve has the ball anchored at the top and bottom (via trunnions), so the ball does not “float” under pressure. This results in lower torque required for actuation, more stable sealing under high pressure, and better durability.
Q3: Why choose butt-weld end connections instead of flanges?
A: Butt-weld ends provide a full-penetration welded joint to the pipeline, which reduces the number of leak paths, minimizes maintenance (no flange gaskets), and is preferred in high integrity, high-pressure or permanent installations.
Q4: Can this valve be automated?
A: Yes. The manual gearbox version is gear-operated, and the design includes an ISO 5211 mounting pad so pneumatic, electric or hydraulic actuators can be fitted easily.
Q5: What are the standard pressure classes and materials available?
A: Typical pressure classes range from ANSI Class 150 up to Class 2500 (depending on size, material and spec) for trunnion ball valves. Body materials can include WCB carbon steel, alloy steel, stainless steel (A182 F316 etc.). Seats may be metal or soft depending on service.
