Marine Bronze Center Spiral Manual Butterfly Valve

About product

The application of butterfly valves in marine vessels is widespread due to their simplicity and ease of operation, as well as relatively low maintenance and replacement costs. These valves come in various types, including handle-operated, turbine-operated, spiral-operated, pneumatic, pneumatic with manual override, hydraulic, hydraulic with manual override. Some may also include feedback and locking features.

These valves can be used to control the flow of various fluids such as air, water, steam, corrosive substances, slurry, oil, liquid metals, and radioactive materials. They primarily serve the purpose of shut-off and throttling in pipelines. The disc-shaped butterfly closure element rotates around its own axis within the valve body to achieve opening, closing, or regulating effects.

The rotation angle of butterfly valves from fully open to fully closed is typically less than 90°. Butterfly valves and the stem itself do not possess self-locking capability. To position the butterfly disc accurately, a worm gear reducer is installed on the stem. By using a worm gear reducer, not only does the butterfly disc acquire self-locking ability to stop at any desired position, but it also improves the operational performance of the valve.

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Product Detail

Characteristics of marine butterfly valves:

  1. Wafer-type butterfly valves require 4 threaded screw holes for normal installation, and 8 threaded screw holes for larger sizes.
  2. Flanged butterfly valves also require 4 threaded screw holes for installation, while the other screw holes are through holes.
  3. Lug-type butterfly valves require all screw holes to be threaded.
  4. They can withstand high temperatures and have a high-pressure range. They are suitable for large nominal sizes, with valve bodies made of carbon steel and metal rings used instead of rubber rings for the valve disc seal. Large high-temperature butterfly valves are made of welded steel plates and are primarily used in high-temperature media such as flue ducts and gas pipelines.

Materials for butterfly valves:
Valve body materials: Ductile iron, cast steel, stainless steel 304, stainless steel 316, stainless steel 316L, bronze, duplex stainless steel 2205/2507/1.4529/1.4469.
Valve disc materials: Ductile iron, cast steel, stainless steel 304, stainless steel 316, stainless steel 316L, bronze, duplex stainless steel 2205/2507/1.4529/1.4469.
Valve stem materials commonly used: 410, 2Cr13, 304, 316, 316L, 2205, and 2507.
Valve seat materials: NBR, EPDM, FPM (VITON), 2Cr13, SS304, SS316, SS316L.

Important factors to consider when ordering butterfly valves:

  1. Specify whether it is a center or offset type.
  2. Provide the corresponding valve body thickness and the dimensions for valve-to-pipeline connection.
  3. Specify the media and temperature for which the valve will be used.
  4. Indicate the operating pressure of the valve and the required materials.

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Marine Bronze Center Spiral Manual Butterfly Valve Type A Parameter

Nominal Pressure/mpaNominal Dimension/mmStructure&Flange DimensionHole Of Nut



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About our company

Zava Marine Corporation is a leading supplier of marine parts and components. With a strong focus on quality and customer satisfaction, we specialize in providing a comprehensive range of high-quality marine equipment and accessories. Our products include deck equipment, ship accessories, and various other essential components needed for smooth maritime operations.

With a global presence, we serve a diverse customer base, including shipbuilders, shipowners, offshore operators, and marine equipment distributors. We are committed to providing exceptional service and tailored solutions to meet our customers’ unique needs.


Zava Marine offers a comprehensive range of certifications for marine parts in accordance with international standards and regulations. These certifications include those provided by renowned marine classification societies such as Lloyd’s Register (LR), Bureau Veritas (BV), China Classification Society (CCS), Registro Italiano Navale (RINA), American Bureau of Shipping (ABS), Nippon Kaiji Kyokai (NK), and Det Norske Veritas – Germanischer Lloyd (DNV-GL). By collaborating with these esteemed societies, Zava Marine ensures that our certified marine parts meet the highest standards of safety, quality, and performance, instilling confidence in our reliability and compliance within the maritime industry.

The warranty provided by Zava Marine covers defects in materials and workmanship for a period of two years from the date of purchase. During this warranty period, if any marine parts purchased from Zava Marine exhibit issues or failures resulting from manufacturing defects or faulty materials, Zava Marine will take responsibility for repair or replacement of the affected parts. 

Zava Marine has recently opened new molds for European and North American clients, utilizing materials such as metal, ABS, PVC, and more. These successful mold opening projects allow us to provide customized marine parts and components that meet the specific requirements of our clients in these regions.

Typically, Zava Marine can ship samples within 7 days once the product drawing has been mutually confirmed by both parties. This efficient process ensures that customers can receive samples promptly, allowing them to assess the quality and suitability of the products.

Zava Marine frequently utilizes a wide range of materials in our projects. These materials include aluminum, stainless steel, carbon steel, copper, plastics, titanium, and PEEK (Polyether Ether Ketone). Each material offers unique properties and characteristics suitable for various marine applications. 

Yes, we provide customization services for marine parts. We understand that every project and application may have unique requirements, and we are committed to delivering tailored solutions. By collaborating closely with our clients, we can adapt our products to specific specifications, ensuring optimal fit, performance, and compatibility. Whether it’s modifying existing designs or creating entirely new parts, our customization services cater to the diverse needs of the maritime industry.

Absolutely! We offer product design and development services to support our clients’ needs. Our experienced team of engineers and designers can collaborate with clients from concept development to final product realization. By leveraging our expertise in marine engineering and design, we can provide valuable insights and innovative solutions. Whether it’s optimizing existing designs or creating entirely new products, we are equipped to assist clients in bringing their ideas to life efficiently and effectively.

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