DEFYING THE CURRENT: UNYIELDING AGAINST CORROSION & PRESSURE

ZERO LEAKAGE, MAXIMUM LIFESPAN: A Triple Offset Valve Case Study in Desalination

In large-scale desalination, where process failure is not an option, the choice of critical components like valves determines operational success. This case study details how a major coastal desalination facility overcame persistent valve failures in its high-pressure systems by partnering with a leading China butterfly valve manufacturer to implement a robust, engineered solution.

The Challenge: Catastrophic Failure in a High-Pressure, Corrosive Environment

The facility's high-pressure brine and reverse osmosis (RO) feed lines, operating at pressures over 70 bar, were a constant source of failure. The combination of intense salinity and extreme pressure caused conventional resilient seated butterfly valves to fail prematurely. Seal degradation led to micro-leaks, critical energy loss, and costly, unplanned shutdowns, threatening the plant's water production targets. The engineering team required a true butterfly valve capable of providing absolute, bi-directional, zero-leakage sealing over a long service life.

The Solution: The Engineered Triple Offset Butterfly Valve

Our technical team proposed the flagship Triple Offset Butterfly Valve, also known as a triple eccentric butterfly valve. This solution was not just a product but a complete engineering package designed for extreme service:

• Geometric Design Superiority: The triple offset geometry ensures the sealing components completely disengage upon opening. This cam-action eliminates friction and wear—the primary failure mode in conventional offset butterfly valve designs, guaranteeing long-term, repeatable sealing.
• Advanced Material Science: The valve featured a stainless steel butterfly valve body and disc made from Super Duplex 2507, providing ultimate resistance to chloride stress corrosion. The sealing system was a robust metal seated butterfly valve design, ensuring a durable, zero-leakage seal.
• Zero-Leakage Performance: The laminated metal-to-metal seal provides a bubble-tight shutoff that meets and exceeds ISO 5208 Rate A and API 609 fire-safe standards, making it the perfect high pressure butterfly valve for this critical application.
• Built to Last: The valve was configured as a double flanged butterfly valve, providing a rigid and secure connection to the pipeline. An external three-layer marine-grade epoxy coating was applied, offering a final, robust barrier against the corrosive coastal atmosphere.

Precision Valve Machining

Large Diameter Butterfly Valve

Butterfly Valve Components

Inside the Butterfly Valve Factory

CNC Center for Lug Type Butterfly Valve

High Performance Valve Testing

Metal Seated Butterfly Valve Assembly

Butterfly Valve Disc Machining

OEM Manufacturer Butterfly Valve Line

Finished Flange Butterfly Valve

CNC Center Workshop

The Result: A New Standard of Reliability

The implementation of the JRVAL triple offset valve was transformative. The plant's Lead Engineer reported a complete elimination of unscheduled shutdowns on the critical brine lines. The inherent reliability of the valve butterfly mechanism drastically reduced maintenance costs and, more importantly, ensured the continuous and efficient production of fresh water. By providing not just hardware but also comprehensive engineering support and documentation, we solidified our role as a premier butterfly valve supplier and a trusted partner in solving the industry's toughest challenges.