Marine SDNR Valve - Marine SDNR Valve - Hi-sea

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Marine SDNR Valve

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

Part name

Material

Advantages / Disadvantages

Valve Body

Bronze

1. Seawater corrosion resistance;
2. The price is slightly higher than that of cast steel and cast iron;

Cast Steel

1. High mechanical strength and toughness;
2. It has special properties such as heat resistance, corrosion resistance and wear resistance;
3. The price is lower than that of bronze and higher than that of cast iron;

Cast Iron

1. Not corrosion resistant;
2. The price is lower than that of bronze and cast steel;

Spool

Bronze

1. Strong low temperature resistance;
2. Seawater corrosion resistance is stronger than stainless steel (304, 316);
3. The price is slightly higher than that of stainless steel;

Stainless Steel

1. It has strong tensile, anti-wear and corrosion resistance, and will not produce corrosion, pitting, corrosion and wear;
2. Stronger than copper;
3. High temperature resistance;

Valve Stem

Stainless Steel 304

1. Acid and alkali resistance;
2. High temperature resistance;
3. The price is lower than stainless steel 316;

Stainless Steel 316

1. It is more corrosion-resistant and acid resistant than stainless steel 304;
2. The price is slightly higher than that of stainless steel 304;

Valve Cover

Bronze

1. Seawater corrosion resistance;
2. The price is slightly higher than that of cast steel and cast iron;

Cast Steel

1. High mechanical strength and toughness;
2. It has special properties such as heat resistance, corrosion resistance and wear resistance;
3. The price is lower than that of bronze and higher than that of cast iron;

Handwheel

Csat Iron

The price is lower than that of bronze and cast copper

The differences are as follows

Product drawings of other low-quality suppliers

Our factory manufactures products

Low quality product features

Consequence

Features of our products

Achieve results

1. Insufficient raw materials;
2. The processing method is not standard

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

1. Made of iron and carbon steel;
2. Use the recovered scrap valve to repair and then sell it again;

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

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

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

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

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;
2. The performance of alternative materials is unstable, without heat treatment, the quality can not meet the standard, and the service life is short

1. Made of stainless steel;
2. The diameter of valve rod meets the design requirements;
3. High temperature quenching and tempering heat treatment

The product has reasonable structure, high safety factor and long service life


Drawing

① Body: Bronze (BC6)

② Disc: Bronze (BC6)

③ Stem: Brass C3771BD

④ KG: 12kg

Parameter performance

Product Showing


Certification


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