Seawater is an electrolyte solution containing many salts and dissolves a certain amount of oxygen. Most metal materials are electrochemically corroded in seawater. The chloride ion content in seawater is very large, which increases the corrosion rate. At the same time, the current and sand particles produce low-frequency reciprocating stress and impact on metal components. In recent years, with the accelerated development of marine development and utilization, the massive construction of coastal nuclear power projects and the promotion of the seawater desalination industry, the application of seawater-resistant butterfly valves has become more and more widespread. To this end, NSEN has developed a seawater-resistant butterfly valve that is suitable for marine industry, nuclear power seawater cooling and other industries.

Ordinary seawater-resistant butterfly valves, in order to adapt to the corrosion of chloride ions in seawater, the valve body, butterfly plate and other accessories are usually made of duplex stainless steel, titanium alloy and aluminum bronze. The shortcomings cannot fully meet the needs of seawater conditions. For example, the titanium alloy butterfly valve has excellent performance in all aspects, but the smelting technology of titanium and titanium alloy is difficult, and the method of obtaining titanium alloy castings is difficult, difficult to process, and the price is very expensive. If the butterfly valve is made of duplex stainless steel, it can resist the corrosion of chloride ions, but the erosion resistance is not good. The flow port and the sealing surface are easily damaged by erosion, causing the sealing surface of the butterfly valve to leak.

NSEN provide a high cost-effective solution for our clients-  Seawater Resistant Rubber Seal Butterfly Valve, this series designed with double offset design and with a soft sealing material like EPDM or the PTFE material.  

Standard material:

Body WCB+protective coating in port

Disc WCB+protective coating

Stem F53

Sealing EPDM