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Flange Gasket Product List

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What is the difference between FF and RF gaskets? A professional explains their shapes, uses, and how to choose them.

What is the difference between FF and RF gaskets? A professional explains their shapes, uses, and how to choose them.

Introducing important points to avoid failure in gasket selection!

Gaskets are essential for flange connections in piping, but did you know there are two types called "FF" and "RF"? These two types have significantly different shapes and areas of sealing surfaces, and choosing the wrong one can lead to serious issues such as leaks. In this article, we will clearly explain the fundamental differences between FF gaskets and RF gaskets, their respective features, and how to choose the right one. *For more detailed information, you can view the related links. For further details, please download the PDF or feel free to contact us.*

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Examples of processing for large-diameter flange gaskets

Examples of processing for large-diameter flange gaskets

Case Study of Processing Gaskets for Large-Diameter Flanges | Water Jet Processing for Multi-Hole Flanges

■Overview of Processing Example Product Name: Gasket for Large Diameter Flange Dimensions: Outer Diameter 985φ × Inner Diameter 756φ (P918/22φ-42) This processing example involves the manufacturing of gaskets used for large diameter flanges. The client operates in the plant and equipment sector, requiring stable dimensional accuracy and hole position reproducibility despite the large outer and inner diameters and the presence of numerous bolt holes. T1120 material was used, and by adopting water jet processing, we achieved stable machining of the outer shape and hole arrangement according to the drawings without compromising the material properties. This facilitates easy alignment during assembly and contributes to workability and sealing performance.

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Processing example of NBR rubber flange gasket (with ears)

Processing example of NBR rubber flange gasket (with ears)

Supports special shapes with water jet processing.

■Overview of Processing Example Product Name: NBR Rubber Flange Gasket (with Tabs) / Dimensions: 10K-50A Thickness 1.5mm / This processing example involves the production of NBR rubber flange gaskets for a piping equipment manufacturer. This product features a special shape with tabs (protrusions) designed to improve installation position confirmation and workability. By adopting water jet processing, we achieved high-precision machining of the complex outer shape, including the tab sections, four bolt holes, and a central piping hole, while minimizing thermal impact on the rubber material. ■Product Features NBR (Nitrile Rubber) has excellent oil resistance, making it an ideal synthetic rubber for seals in fuel oils and lubricants. It also boasts high mechanical strength and wear resistance, and is widely used in O-rings, gaskets, hoses, and more. However, its weather resistance and ozone resistance are low, making it unsuitable for outdoor use; it is primarily utilized in indoor hydraulic and pneumatic equipment.

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JIS internal surface shape (RF) flange gasket

JIS internal surface shape (RF) flange gasket

We manufacture JIS standard size inner shape (RF) gaskets and packing from one piece to mass production.

List of JIS standard dimensions from 10A to 1500A *Quoted from Appendix 4 of JIS B 2404:2006 "Dimensions of Gaskets for Pipe Flanges." *For nominal pressures 2K, 40K, and 63K, quoted from Table 2 of Reference 3 of (Old) JIS B 2238:1996 "General Rules for Steel Pipe Flanges."

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JIS internal shape with handle (RF) flange gasket

JIS internal shape with handle (RF) flange gasket

We manufacture JIS standard size internal shape gaskets and packing with handles (RF) from one piece to mass production.

List of JIS standard dimensions from 10A to 1500A *Quoted from Appendix 4 of JIS B 2404:2006 "Dimensions of Gaskets for Pipe Flanges." *For nominal pressures 2K, 40K, and 63K, quoted from Reference Table 2 of (Old) JIS B 2238:1996 "General Rules for Steel Pipe Flanges."

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JIS Full Face (FF) Flange Gasket

JIS Full Face (FF) Flange Gasket

We manufacture JIS standard size full face (FF) gaskets and packing from one piece to mass production.

List of JIS standard dimensions from 10A to 1500A *Quoted from Appendix 4 of JIS B 2404:2006 "Dimensions of Gaskets for Pipe Flanges." *For nominal pressures 2K, 40K, and 63K, quoted from Table 2 of Reference 3 of (Old) JIS B 2238:1996 "General Rules for Steel Pipe Flanges."

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[Water Jet Processing Example] Gasket with Handle

[Water Jet Processing Example] Gasket with Handle

We will introduce a case where having a handle made it easier to insert and position the gasket between the flanges!

We would like to introduce a processing case of "V6502 Black Super" conducted by Daiko Co., Ltd. Based on the customer's drawings, we manufactured a flange gasket for 10K-50A from a 3mm thick non-asbestos joint sheet "Vulcan No. V6502 (Black Super)." It was processed into a shape with handles using a water jet cutting machine. Having handles makes it easier to handle and manage the installation of the gasket. Additionally, since the handles protrude outside the flange, it helps prevent human error by forgetting to insert the gasket. [Case Overview] - Material: Vulcan No. V6502 (Black Super) - Product: Flange gasket for 10K-50A (with handles) - Work Details: Processed into a shape with handles using a water jet cutting machine *For more details, please download the PDF or feel free to contact us.

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Water Jet Processing Case: Large Diameter Gasket

Water Jet Processing Case: Large Diameter Gasket

Introducing a case where 14 bolt holes with a diameter of 12mm were drilled on a P.C.D. of 550mm!

We would like to introduce a case study of water jet processing of "EPDM rubber" that our company conducted. In this case, based on the drawings provided by the customer, we manufactured a large diameter flange gasket with an outer diameter of φ600mm and an inner diameter of φ500mm from a 4mm thick EPDM rubber sheet. The processing involved drilling 14 bolt holes of φ12mm on a P.C.D. of 550mm, using our water jet cutting machine to achieve high precision cutting according to the data. 【Case Overview】 ■ Material: 4mm thick EPDM rubber sheet ■ Product: Large diameter flange gasket with an outer diameter of φ600mm and an inner diameter of φ500mm ■ Processing details: Drilling 14 bolt holes of φ12mm on a P.C.D. of 550mm *For more details, please download the PDF or feel free to contact us.

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Processing examples of PTFE water service gaskets

Processing examples of PTFE water service gaskets

Processing example of PTFE water service gaskets | Press processing for 150A flanges

■Overview of Processing Example Product Name: PTFE Gasket for Water Supply Dimensions: 3t Water Supply 150A FF Material: PTFE Processing Method: Press Processing This processing example involves the production of a PTFE gasket used for the flange part of water supply equipment. The product features a full-face shape compatible with a 150A flange, with bolt holes arranged evenly. Since it is used for water supply applications, PTFE, which has low impurity leaching and excellent chemical resistance, is employed as the material. As this was a project intended for mass production, press processing was selected to achieve both dimensional reproducibility and processing efficiency. As a result, stable dimensional accuracy is ensured while minimizing positional misalignment during assembly, achieving reliable sealing performance.

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Processing example of D5800RCF high-temperature duct gasket.

Processing example of D5800RCF high-temperature duct gasket.

Flange shape adaptation through laser processing.

Overview of Processing Example Product Name: Flange Gasket for High-Temperature Ducts Dimensions: Equivalent to JIS 10K-80A (Thickness 4mm) This example involves the processing of a gasket for duct flanges used in high-temperature exhaust equipment. Dimensional accuracy and positional reproducibility during installation were required for the circular shape, which includes bolt holes. By adopting laser processing without molds for products related to piping and equipment, we enable shape modifications and small lot production while ensuring stable processing quality. Product Features (D5800RCF) Exhaust gases, combustion gases, hot air, etc., for duct flanges and manhole gaskets. Uses biocompatible, biodegradable fiber cloth that complies with RCF regulations. Various processing methods, including sewing, are available, allowing for large-diameter processing. Used for high-temperature duct seals.

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Processing example of V6500AC flange gasket

Processing example of V6500AC flange gasket

Mass production support through press processing.

■Overview of Processing Example Product Name: Flange Gasket / Dimensions: 3t 10K-125A Full Face / This processing example involves the production of a flange gasket using the V6500AC. A corrosion-resistant material was selected for applications requiring corrosion suppression in stainless steel piping. It features a full face shape with 8 bolt holes and is used for sealing at piping connections. Mass production with stable dimensional accuracy is achieved through press processing. ■Product Features No. 6500AC is a corrosion-resistant type that reduces soluble chlorine. It provides corrosion suppression effects when using water or aqueous solutions with stainless steel flanges. Additionally, surface treatment reduces adhesion to the flange. It is suitable for stainless steel piping and valve bonnets in various industries that require corrosion resistance.

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