Marine SDNR Valve
Introduction
A Marine SDNR valve is a type of valve commonly used in marine applications to prevent the backflow of seawater or other fluids into the ship's piping system. SDNR stands for "Screwed Down Non-Return" valve, which refers to the valve's design and function.
The Marine SDNR valve is typically installed at the sea chest, which is an opening in the ship's hull that allows seawater to enter the ship's piping system for various purposes, such as cooling the engine or providing water for various systems. The SDNR valve ensures that seawater flows in only one direction, preventing backflow and protecting the ship's systems from contamination or damage.
The valve is usually made of materials such as bronze, cast iron or stainless steel, which are resistant to corrosion and can withstand the harsh marine environment. It can be operated manually or through an automatic system, depending on the specific application and requirements.
Feature
1. Non-Return Function: The primary function of the Marine SDNR valve is to prevent backflow. This is achieved by a specially designed disc that blocks the flow in the opposite direction when the valve is closed.
2. Screw Down Design: The valve is designed to be screw down type, which means that it is operated by turning a handle or wheel to adjust the valve position. The screw-down design allows for precise control of the flow.
3. Compact Size: Marine SDNR valves are typically smaller in size than other types of valves, making them ideal for use in tight spaces where space is at a premium.
4. Corrosion Resistant: Due to their marine application, these valves are typically made of materials that are resistant to corrosion, such as brass, bronze, or stainless steel.
5. Easy Maintenance: Marine SDNR valves are designed to be easily disassembled and reassembled for maintenance purposes. This allows for quick and easy replacement of parts or cleaning, which is important in marine environments where maintenance is crucial for reliable operation.
Configuration Selection
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Part name |
Material |
Advantages / Disadvantages |
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Valve Body |
Bronze |
1. Seawater corrosion resistance; |
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Cast Steel |
1. High mechanical strength and toughness; |
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Cast Iron |
1. Not corrosion resistant; |
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Spool |
Bronze |
1. Strong low temperature resistance; |
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Stainless Steel |
1. It has strong tensile, anti-wear and corrosion resistance, and will not produce corrosion, pitting, corrosion and wear; |
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Valve Stem |
Stainless Steel 304 |
1. Acid and alkali resistance; |
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Stainless Steel 316 |
1. It is more corrosion-resistant and acid resistant than stainless steel 304; |
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Valve Cover |
Bronze |
1. Seawater corrosion resistance; |
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Cast Steel |
1. High mechanical strength and toughness; |
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Handwheel |
Csat Iron |
The price is lower than that of bronze and cast copper |
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Product drawings of other low-quality suppliers |
Our factory manufactures products |
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Low quality product features |
Consequence |
Features of our products |
Achieve results |
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1. Insufficient raw materials; |
The wall thickness is uneven, the material distribution is uneven, the valve body is easy to be damaged, and the service life is short |
It is processed in strict accordance with the standard, with uniform wall thickness and material |
The product has high safety factor and long service life |
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1. Made of iron and carbon steel; |
The hardness and accuracy of the valve cannot meet the needs of use, and the shell is easy to crack, resulting in running, emitting, dripping and leakage, and even causing oil and gas pipeline explosion |
Select high-quality materials according to customer needs, and make new products in strict accordance with standards |
The hardness and accuracy of the valve meet the standard quality requirements to ensure the normal operation of the equipment |
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To improve profit margin, purchase cheap unqualified bolts |
Unqualified valve bolts lead to safety hazards, which is easy to cause accidents |
Make new valves in strict accordance with the material requirements of customers, and never substitute inferior products for good ones |
Meet the hardness and accuracy requirements of standard valves, ensure the quality of valves and ensure the normal operation of equipment |
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Flange manufacturing quality is poor, with cracks, pores, insufficient thickness and other problems |
It leads to wear resistance and poor pressure bearing of the valve, and the valve is prone to quality problems, which makes short service life |
Adopt standard bolts with quality assurance in strict accordance with customer requirements |
Improve safety factor and prolong service life |
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In order to reduce the cost, cast iron valve core is used instead of bronze valve core |
Cast iron valve core is easy to be corroded and damaged |
Select standard materials in strict accordance with customer requirements |
The product structure is reasonable and the safety factor is high |
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In order to reduce costs, ordinary round steel valves are used instead of stainless steel valves |
1. The diameter of valve rod fails to meet the requirements; |
1. Made of stainless steel; |
The product has reasonable structure, high safety factor and long service life |
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Drawing |
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① Body: Bronze (BC6) |
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② Disc: Bronze (BC6) |
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③ Stem: Brass C3771BD |
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④ KG: 12kg |
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Parameter performance
Product Showing
Certification
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