2″ Ball Check Valve, Quick Close & Moderate Flow Resistance Backflow Prevent Valve
2″ ball check valve closes sensitively with moderate flow resistance, complies with MSS SP-71, prevents backflow for water treatment & petrochemical pipelines.
Description
The 2‑inch ball check valve belongs to the DN50–DN300 medium‑bore valve series. Its primary functions are to allow unidirectional flow and prevent reverse media backflow, thereby protecting pumps from impeller damage caused by backflow impact and mitigating water hammer in piping networks. Relying on a gravity operated ball closure structure, the valve responds swiftly—once a reverse flow tendency occurs, the ball promptly seats against the sealing ring to block any backflow. The internally streamlined chamber offers moderate flow resistance, ensuring that pressure drop and pumping energy are not excessively increased, thus striking a balance between anti‑siphon performance and conveying efficiency.
Basic Technical Parameters
| Parameter | Specification |
|---|---|
| Nominal size | NPS 2″ (DN50) |
| Pressure rating | Class150, PN16/PN25 |
| Body materials | Ductile iron, WCB carbon steel, CF8M 316 stainless steel |
| Connections | Flanged, threaded, butt‑weld |
| Standards | MSS SP‑71, API 598, EN 12334 |
| Temperature range | 0°C ~ 180°C |
This valve incorporates no hinge pins or shafts that are prone to sticking, giving it better resistance to debris than swing check valves—making it well suited for wastewater or fluids with minor suspended solids. The one‑piece cast body, combined with an inline ball non return valve configuration, allows installation in both horizontal and vertical piping, offering greater flexibility on site. Sealing options include a rubber‑coated ball for clean water systems or a metal‑hard seated version for high‑temperature chemical lines.
These check valves are extensively used in municipal water purification plants, petrochemical cooling water circuits, HVAC pumping stations, and fire‑protection supply lines. For example, the Vancouver Westside Water Treatment Plant (Vancouver Water Facility, 2800 W 16th Ave, Vancouver BC V6K 3C7, Canada) has deployed 2″ ball check valves in bulk within its clean‑water transmission network. In response to frequent pressure fluctuations, the valve’s rapid closure effectively dampens water hammer caused by backflow, while its moderate flow resistance ensures stable round‑the‑clock delivery—keeping the plant’s operational energy consumption consistently low over the years.
Every unit undergoes both hydrostatic and pneumatic leak tests prior to shipment and holds internationally recognized fluid‑industry certifications. Additional options include anti‑corrosion coatings and customized ball materials to suit specific service conditions.
