Seawater Resistant Rubber Seal Butterfly Valve
• Rubber Seal
• Floating Seat
• Seawater Corrosion
Valve body, disc and clamp ring are made of carbon steel or cast iron, for the purpose to lower the cost and to have the valve available with a high performance-price ratio. All the portions contacting with the medium are coated with ceramic etc, corrosion proof coating so as to enhance the valve capacity to resist seawater corrosion. The material in CF8M, C95800, C92200, C276, 316Ti etc also could be provided.
The shaft sleeve of valve is made of Duplex Stainless steel and uses an interference fit with the shaft hole on the body so as to effectively prevent the shaft hole against seawater corrosion.
Duplex Stainless Steel is used for the sealing face of the seat, in order to enhance both anti-corrosion capacity and wearability of the sealing.
Valve Marking: MSS-SP-25
Design & Manufacture: API 609, EN 593
Face to Face Dimension: API 609, ISO 5752, EN 558
End Connection: ASME B16.5, ASME B16.47, EN 1092, JIS B2220, GOST 12820
Test and Inspection: API 598, EN 12266, ISO 5208, ANSI B16.104
Top Flange: ISO 5211
NSEN Seawater Resistant Butterfly Valve are in Double offset design with a live-load combined packing ,e.g. V type PTFE+ V type EPDM packing, in order to make sure of no leakage during repair cycle.
This series is set with a retainer ring , which can prevent seawater from penetrating in between stem and shaft sleeve, eliminate the seawater corrosion to both and, meanwhile, prevent the muddy sand, deposit, sea creatures from penetrating into the interval, which will cause both to be occluded, to effectively enhance the reliability of the valve in its use.
NSEN strictly follow the free repair, free replacement and free return services within 18 months after the valve is ex-works or 12 months after being installed and used on the pipeline after ex-works (upon which comes first).
In the case the valve gets failed due to the quality problem during the use in the pipeline within the quality warranty period, NSEN will provide free quality warranty service. The service shall not be ended until the failure is surely made settled and the valve normally workable as well as the client signs the letter of confirmation.
After expiration of the said period, NSEN guarantees to provide the users with on-time quality technical services whenever the product needs to be repaired and maintained.