manual butterfly valve Archives

Factors Affecting Sealing Performance of Concentric Soft Seal Butterfly Valves

March 13, 2025

Key Factors

Seat Material Selection: EPDM for seawater, NBR for oil, VITON for high temperature.
Machining Precision: Concentricity between valve body, disc, and seat.
Installation Position: Horizontal installation is preferred over vertical to avoid self-weight affecting sealing.
Torque Control: Excessive or insufficient torque may damage the seat.

Key Technical Points

Ensure concentricityamong body, disc, and seat.
Select suitable sealing materials.
Prevent high-temperature aging of the seat.
Apply anti-corrosion coatingsor linings to enhance seawater corrosion resistance.

Tianjin Tanghai Valve Co., Ltd. is a professional marine valve manufacturer, including butterfly valve, check valve, gate /Knife gate valve. We have certificates: CE, ISO, BV, DNV foundry and products approval. Now we have our own independent R & D, manufacturing, assembly and warehousing workshops; we have professional pre-sale and after-sale technical support and perfect services. Below is our wafer butterfly valve of marine valves,if you need to check more information, please click here:https://www.tanghaivalve.com/wafer-type-butterfly-valve-th-btv-aw/.

Please contact us if you need more support, please contact us freely: info@tanghaivalve.com.

We are committed to “Build a top valve enterprise; Be a reliable partner!”Friends from all over the world are welcome to visit us for evaluation, guidance, and orders!

Comparison Between Concentric and Double Offset Marine Butterfly Valves

March 7, 2025

Item	Concentric Butterfly Valve	Double Offset Butterfly Valve
Structure	Disc center aligned with body centerline	Disc center offset from body centerline
Sealing Type	Mainly soft seal	Soft+hard seal available
Operation Torque	Low	Slightly higher
ApplicationPressure	Low to medium pressure(PN6-PN16)	High pressure(PN25-PN40)
Cost	Lower	Higher
Typical Application	General ship pipelines,ballast water systems	High-ressure fire system,deck wash system

Centerline butterfly valves are more economical and suitable for general marine pipelines, while double offset valves are better for high pressure, high temperature, or special media.

Tianjin Tanghai Valve Co., Ltd. is a professional marine valve manufacturer, including butterfly valve, check valve, gate /Knife gate valve. We have certificates: CE, ISO, BV,

DNV foundry and products approval. Now we have our own independent R & D, manufacturing, assembly and warehousing workshops; we have professional pre-sale and after-sale technical support and perfect services. Below is our wafer butterfly valve of marine valves,if you need to check more information, please click here:https://www.tanghaivalve.com/wafer-type-butterfly-valve-th-btv-aw/.

Please contact us if you need more support, please contact us freely: info@tanghaivalve.com.

Butterfly Valve Connection Standard

December 27, 2024

Butterfly valves are widely used in industrial applications for regulating flow and are manufactured according to several connection standards. These standards ensure compatibility, safety, and reliability. Below are the common connection standards for butterfly valves:

1. Flanged Connections

Butterfly valves with flanged ends are designed to mate with standard pipe flanges. The key standards for flanged connections include:

ASME B16.5: Pipe Flanges and Flanged Fittings (covers sizes from ½ inch to 24 inches, pressure classes 150 to 2500).
EN 1092-1: Flanges and their joints for PN-designated pressure systems.
ISO 7005-1: Metallic flanges for general purposes.
JIS B2220: Japanese flange standard.

2. Wafer Type Connections

Wafer butterfly valves are designed to fit between two pipe flanges using bolts or studs.

They are typically compatible with flange drilling patterns as per:
- ASME B16.5
- EN 1092
- ISO 7005

3. Lug Type Connections

Lug butterfly valves have threaded inserts that allow them to be bolted to a pipe flange. Standards include:

ASME B16.5
EN 1092
ISO 7005

4. Grooved End Connections

For quick installation and connection to grooved piping systems.

AWWA C606: Grooved and shouldered joints.

5. Butt-Weld Connections

Less common for butterfly valves but occasionally used in specific applications.

ASME B16.25: Butt-welding ends.
ISO 9692: Welding preparation standards.

6. Standards for Specialized Applications

AWWA C504: For waterworks applications, especially large-diameter valves.
API 609: Butterfly valves for general-purpose applications.
MSS SP-67: Covers butterfly valves, general-purpose and high-performance types.

Key Considerations

Always ensure that the valve and mating components meet the same flange drilling patterns and pressure ratings.
Verify that the material of construction and dimensions meet the system’s operational requirements (temperature, pressure, medium compatibility).

Let us know if you’d like details on a specific standard!

The Application of Concentric type Butterfly Valve in Offshore Drilling Platforms

June 15, 2024

Concentric type butterfly valves find several applications in offshore drilling platforms due to their reliability, compact design, and ease of operation. Here’s how centerline butterfly valves are used in offshore drilling platforms:

Flow Control in Seawater Systems:

Concentric butterfly valves are used to control the flow of seawater for different purposes:

Cooling Systems: Regulating seawater flow for cooling heat exchangers, engines, and other equipment.

Firewater Systems: Controlling seawater flow for firefighting purposes.

General Service Water: Regulating water flow for various platform operations.

Fluid Control in Drilling Operations:

Drilling Mud Systems: Controlling the flow of drilling mud during drilling operations.

Mud Mixing Systems: Regulating the flow of chemicals and additives mixed with drilling mud.

Ballast Systems:

Regulating the flow of seawater into and out of ballast tanks to adjust the platform’s stability and draft.

Bilge and Drainage Systems:

Managing the discharge of bilge water and other drainage fluids from the platform to maintain a safe environment.

Fire Protection Systems:

Concentric butterfly valves are used in firewater deluge systems and fire hydrant systems for emergency fire suppression.

Potable Water Systems:

Regulating the flow of potable water for living quarters, kitchens, and other facilities on the platform.

HVAC Systems:

Controlling the flow of seawater or chilled water for heating, ventilation, and air conditioning systems.

Tank Farm Operations:

Handling the flow of various liquids such as crude oil, refined products, and chemicals within the platform’s storage tank systems.

Key Advantages in Offshore Applications:

Corrosion Resistance: Materials are selected to withstand corrosive marine environments.

Space Efficiency: Compact design is suitable for installations where space is limited, which is common in offshore platforms.

Quick Operation: Rapid opening and closing for emergency shutdown situations.

Reliable Sealing: Provides tight shut-off to prevent leaks, crucial for safety and environmental protection.

Safety and Emergency Shutdown Systems:

Concentric butterfly valves are often integrated into safety systems, including emergency shutdown (ESD) systems, to quickly isolate sections of piping in case of emergencies.

Concentric type butterfly valves play a vital role in offshore drilling platforms, ensuring efficient fluid control, safety, and environmental protection. Their versatility, reliability, and space-saving design make them well-suited for various critical applications in offshore oil and gas operations. Proper selection, installation, and maintenance of these valves are essential to ensure the safe and efficient operation of offshore drilling platforms.

Tianjin Tanghai Valve Co., Ltd. is a professional marine valve manufacturer, including butterfly valve, check valve, gate /Knife gate valve. We have certificates: CE, ISO, BV, DNV foundry and products approval. Now we have our own independent R & D, manufacturing, assembly and warehousing workshops; we have professional pre-sale and after-sale technical support and perfect services. Below is our wafer butterfly valve of marine valves,if you need to check more information, please click here:https://www.tanghaivalve.com/wafer-type-butterfly-valve-th-btv-aw/.

Please contact us if you need more support, please contact us freely: info@tanghaivalve.com.We are committed to “Build a top valve enterprise; Be a reliable partner!”Friends from all over the world are welcome to visit us for evaluation, guidance, and orders!

Purchasing precautions for handle butterfly valves

December 7, 2021

When purchasing handle butterfly valves, it is not enough to only know the product specifications, categories and working pressure requirements, and it is impossible to achieve a good balance. Because different handle butterfly valve manufacturers have their own corporate standards and product personality, and some non-standard

JIS 10K-wafer butterfly valve-backup seat (4)

production to meet different customer requirements, it is unscientific to purchase valves based on rigid requirements such as specifications. So what should we refer to? There are mainly several aspects, including working pressure, caliber, what medium to pass, and what to use, etc. When purchasing valves, detailed technical parameters must be listed and a consensus must be reached with the valve manufacturer. Below we introduce in detail:
1. Working conditions
Valve specifications and types should be combined with the requirements of pipeline planning documents, that is, working conditions. The model of the valve should indicate the national standard number it is based on. The working pressure of the valve, the working pressure of the pipeline, and the working pressure that the valve can take over should be greater than the actual working pressure of the pipeline. Either side of the valve in the closed state should be able to take over 1.5 times the valve working pressure without leakage. When the handle butterfly valve is in the open state, the valve body needs to be able to take over twice the pressure of the valve. The valve manufacturing standard should be clearly based on the national standard number.
2. Valve standard quality
The material of the valve body should be mainly carbon steel and stainless steel. Stem material, stainless steel stem that is not easy to rust is more commonly used, and the nut material is mostly brass or bronze. The material of the sealing surface can be divided into metal seal and soft seal. The valve seat and valve plate are made of metal material, which is a hard seal, including stainless steel, ductile iron, etc. If one side between the valve seat and the valve plate is made of elastic material such as rubber, tetrafluoroethylene, etc., it is a soft sealing butterfly valve. When purchasing soft-seal handle butterfly valves, the physical, chemical and hygienic testing data of the valve plate lining material should be clear. For the sanitary, anti-aging performance, and wear resistance of the handle butterfly valve, you must also understand the manufacturer.
The above is the best technical knowledge to know when purchasing handle butterfly valves. At present, many valve factory products in our country still have the shortcomings of internal leakage, low appearance quality, short life, inflexible operation, and unreliable valve electric and pneumatic devices. Some high temperature, high pressure and valves required on key devices still rely on imports. Therefore, in order to make a breakthrough in the industry, Tanghai Valve has a clear focus on the concept of boutique: whether it is the exhibits at the exhibition or the parts seen by the visiting enterprises, the appearance of Tanghai Valve is neat and delicate, and the parts protection is in place. Small parts Use plastic protective covers, wooden seats and leather pads for large parts. These details are countless, all in order to establish a better brand image and increase the trust of new customers in the product. If you want to purchase handle butterfly valves, please come to Tanghai to visit and purchase, more professional and more assured.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Video of center-lined butterfly valve: https://youtu.be/NuSZH_AJcwY

Uses and characteristics of manual butterfly valve (4)

July 21, 2020

Installation and maintenance of manual butterfly valve:
During installation, the disc should stop in the closed position. The opening position should be determined according to the rotation angle of the butterfly plate. For

wafer type butterfly valve, with handle (13)

the butterfly valve with bypass valve, the bypass valve should be opened before opening, and the installation should be carried out according to the manufacturer’s installation instructions. The heavy butterfly valve should be set with a firm foundation.

Comparison of ordinary butterfly valve and gate valve:

Which of the ordinary butterfly valve or gate valve with the same nominal pressure and nominal diameter has better tightness and is not easy to leak?

The airtightness of the gate valve is better than that of the butterfly valve, but there are also manufacturers’ butterfly valves that have better airtightness. This type of valve should generally be installed horizontally in the pipeline.

The gate valve is large in size and takes up a lot of space.

The butterfly valve is small in size and takes up little space.

When selecting, the temperature of the medium, the sealing of the valve and the packing must also be considered.

The specification stipulates that butterfly valves with a nominal diameter greater than 50 are used.

The elastic metal sealing butterfly valve is a national key new product. The high-performance manual butterfly valve adopts a double eccentric and a special oblique cone oval sealing structure. It solves the shortcoming of the traditional eccentric butterfly valve that the sealing surface is still in sliding contact friction at the moment of opening and closing 0°～10°, and the sealing surface of the butterfly plate is separated at the moment of opening, and the effect of sealing when the contact is closed is achieved. Good purpose.

Material of manual butterfly valve:
1. Valve body material: gray cast iron, ductile iron, cast steel, aluminum alloy, stainless steel, etc.;

2. Valve plate material: duplex stainless steel, nylon 11 plate, galvanized plate, aluminum bronze;

3. Valve seat material: nitrile rubber, EPDM, fluorine rubber, silicone rubber, PTFE.

Ranges of application for manual butterfly valve:
It is widely used in the pipelines of petroleum, chemical, food, medicine, papermaking, hydropower, shipbuilding, water supply and drainage, metallurgy, oil, energy and other systems. It is suitable for a variety of corrosive gases, liquids, semi-liquid and solid powder media.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Uses and characteristics of manual butterfly valve (3)

July 21, 2020

Features of manual butterfly valve:
The butterfly valve opening and closing part is a disc-shaped butterfly plate, which rotates around its own axis in the valve body to achieve opening and closing or adjustment of the valve is called a butterfly valve. The butterfly valve is usually less than 900 from fully open to fully closed. The butterfly valve and the butterfly rod

Double flange butterfly valve (7)

themselves are not self-locking. For the positioning of the butterfly plate, a worm gear reducer must be installed on the valve rod. The use of worm gear reducer can not only make the butterfly plate have self-locking ability, make the butterfly plate stop at any position, but also improve the operation performance of the valve. Industrial-specific butterfly valves are characterized by high temperature resistance, high applicable pressure range, large nominal diameter of the valve, the valve body is made of carbon steel, and the sealing ring of the valve plate uses a metal ring instead of a rubber ring. Large high-temperature butterfly valves are manufactured by welding steel plates, and are mainly used for flue ducts and gas pipes for high-temperature media.

Advantages of manual butterfly valve:
The opening and closing is convenient and rapid, labor-saving, low fluid resistance, and can be operated frequently. Simple structure, small size and light weight. Mud can be transported, with the least accumulation of liquid at the pipe mouth. Under low pressure, good sealing can be achieved. Good adjustment performance.

Disadvantages of manual butterfly valves:
1. Use pressure and working temperature range are small.
2. Poor airtightness.

Classification of manufal butterfly valve:
According to the structure, it can be divided into offset plate type, vertical plate type, inclined plate type and lever type. According to the sealing form, it can be divided into two types: soft sealing type and hard sealing type. The soft seal type generally uses a rubber ring seal, and the hard seal type generally uses a metal ring seal. According to the connection type, it can be divided into flange connection and wafer connection; according to the transmission mode, it can be divided into manual, gear transmission, pneumatic, hydraulic and electric.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Uses and characteristics of manual butterfly valve (2)

July 21, 2020

Uses/application of manual butterfly valve:
Used in the gas pipeline in the sulfuric acid industry: the inlet and outlet of the blower in front of the furnace, the inlet and outlet of the relay fan, the electric demisting series and the connecting valve, the inlet and outlet of the S02 main blower, the adjustment of the converter, the inlet and outlet of the preheater, etc. and

ductile iron, DI, butterfly valve, manufacturer, center line, TH valve

the use of cut-off gas.

It is used in the sulfur burning, conversion and dry absorption sections of the sulfur-burning sulphuric acid plant. It is the preferred brand of valves for the sulphur-burning sulphuric acid plant. It is regarded by the majority of users as: good sealing performance, light operation, secondary corrosion, high temperature resistance, convenient operation, The flexible, safe and reliable butterfly valve has been widely used.

It is also widely used in: SO2, steam, air, gas, ammonia, CO2, oil, water, brine, lye, seawater, nitric acid, hydrochloric acid, sulfuric acid, phosphoric acid in the chemical, petrochemical, smelting, pharmaceutical, food and other industries It is used as a regulating and intercepting device on the pipeline of other medium.

Structural features of manual butterfly valve:

The unique design of three-way eccentricity enables frictionless transmission between the sealing surfaces and prolongs the service life of the valve.
Elastic seal is produced by torque.
The clever wedge-shaped design enables the valve to have an automatic sealing function that is tighter and tighter, and the sealing surfaces are compensated and leak-free.
Small size, light weight, light operation and easy installation.
Pneumatic and electric devices can be configured according to user requirements to meet the needs of remote control and program control.
The material of replacement parts can be applied to various media, and can be lining anti-corrosion (lining F46, GXPP, PO, etc.).
Diversified continuous structure: wafer, flange, butt welding.

Tianjin TanghaiDongyang Valve Co., Ltd. is one of the largest butterfly valve manufacturers in China, main products are butterfly valves, check valves.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Uses and characteristics of manual butterfly valve (1)

July 21, 2020

The butterfly plate of the manual butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical passage of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0°-90°. When the rotation reaches 90°, the valve is fully opened. The butterfly valve is simple in structure, small in size and light in weight, and consists of only a few parts. Moreover, it can be opened and closed quickly by rotating 90°, and the

manual Wafer type butterfly valve with worm gear

operation is simple. At the same time, the valve has good fluid control characteristics.

Introduction of manual butterfly valve:
The butterfly plate of the butterfly valve is installed in the diameter direction of the pipe. In the cylindrical passage of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0°-90°. When the rotation reaches 90°, the valve is fully opened.

The butterfly valve is simple in structure, small in size and light in weight, and consists of only a few parts. Moreover, it can be opened and closed quickly by rotating 90°, and the operation is simple. At the same time, the valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is small, so it has better flow control characteristics. Butterfly valves have two sealing types: elastic seal and metal seal. Elastic sealing valve, the sealing ring can be embedded in the valve body or attached to the periphery of the butterfly plate.

Valves with metal seals generally have a longer life than valves with elastic seals, but it is difficult to achieve a complete seal. Metal seals can adapt to higher operating temperatures, while elastic seals have the defect of being limited by temperature.

If the butterfly valve is required to be used as a flow control, the main thing is to correctly select the size and type of the valve. The structure principle of the butterfly valve is especially suitable for making large diameter valves. Butterfly valves are not only widely used in general industries such as petroleum, gas, chemical, and water treatment, but also used in cooling water systems of thermal power stations.

Commonly used butterfly valves include wafer butterfly valves and flange butterfly valves. Wafer type butterfly valve uses double-head bolts to connect the valve between two pipe flanges. Flange type butterfly valve has flanges on the valve, and bolts are used to connect the flanges at both ends of the valve to the pipe flanges.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Posts

Factors Affecting Sealing Performance of Concentric Soft Seal Butterfly Valves

Comparison Between Concentric and Double Offset Marine Butterfly Valves

Butterfly Valve Connection Standard

The Application of Concentric type Butterfly Valve in Offshore Drilling Platforms

Purchasing precautions for handle butterfly valves

Uses and characteristics of manual butterfly valve (4)

Uses and characteristics of manual butterfly valve (3)

Uses and characteristics of manual butterfly valve (2)

Uses and characteristics of manual butterfly valve (1)

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