5″ Ball Valve, Low Flow Resistance High Pressure Resistant Main Pipeline Isolation Valve
5″ ball valve features full port low flow resistance & high pressure resistance, meets ANSI Class 300, used for water plant & chemical main pipeline control.
Description
The 5‑inch ball valve, sized at NPS 5 (DN125), falls within the DN50–DN300 medium‑to‑large bore category. It is predominantly used for on‑off isolation on high‑flow main pipelines such as water plant transmission mains, chemical process headers, and district heating networks.
The valve features a full port straight flow channel design, with no internal constrictions or reduced‑bore obstructions. This ensures unimpeded media passage with extremely low flow resistance, significantly reducing pipeline energy consumption in large‑volume water transfer applications. The body is constructed from thickened forging stock, reinforced with a strengthened neck structure, delivering excellent high‑pressure resistance. It reliably accommodates ANSI Class150 and Class300 pressure ratings, withstanding hydraulic shocks and pressure surges.
Basic Technical Parameters
| Parameter | Specification |
|---|---|
| Nominal size | NPS 5″ (DN125) |
| Pressure rating | ANSI Class 150 / Class 300 |
| Connection type | RF flange, BW butt‑weld |
| Body material | WCB carbon steel, A105 forged steel, 304 stainless steel |
| Construction type | Fixed ball valve |
| Standards | API 6D, ISO 5208 |
| Temperature range | –29°C ~ 250°C |
The valve adopts a trunnion‑mounted (fixed) ball configuration, which offers greater pressure‑bearing stability than floating ball designs—under high pressure, the ball remains centered, ensuring zero leakage sealing. An ISO 5211 standard mounting pad is provided on top, allowing integration with pneumatic or electric actuators for automated control. Two sealing options are available: PTFE soft‑seat for clean water service (achieving bubble‑tight shutoff) and metal hard‑seat for high‑temperature, high‑pressure chemical media, providing long service life and resistance to wear.
This ball valve is widely installed in municipal water treatment plant trunk lines, refinery cooling water circuits, and urban central heating supply mains. A notable example is the Helsinki Central Water Treatment Plant’s main transmission system (Helsinki Veden tuotantolaitos, Vanha Kaarelantie 80, 00760 Helsinki, Finland), which has adopted the 5″ ball valve throughout its network. The low‑resistance characteristic ensures ample flow capacity for the city’s high‑demand water supply, while the reinforced body withstands the plant’s high‑pressure delivery conditions. Under continuous year‑round operation, pressure losses are kept to a minimum, effectively reducing pumping electricity costs.
All valves undergo hydrostatic strength testing, pneumatic leak testing, and non‑destructive examination (NDE) prior to shipment. They hold internationally recognized industrial certifications, and customisation options include hardfacing overlay, anti‑corrosion coatings, and other tailored finishes.
