Hard Seal Ductile Cast Iron Stainless Steel Seat Double Flange Butterfly Valve

Product Description

The triple name offset indicates that the disc is not vertically centered and slopes up and down. As a result, it appears to be off-balance. The stem connects the disc to the valve body and, in turn, creates a third offset, which is the stem's thickness from the flat side to a rounded tip. Because of this, the triple offset butterfly valve has a lower maximum capacity than a flat disc valve.

The triple offset butterfly valve is an effective, high-pressure valve that has many benefits. Its design features a metal-to-metal sealing arrangement that virtually eliminates disc-to-seat rubbing, which causes wear and a shorter life span. A triple offset butterfly valve is a high-performance valve that closes with zero leakage. The offset angle eliminates rubbing between the seat ring and the seal, which results in a repeatable, zero leak shutoff. 

 

Bi-Directional Sealing

The triple offset design allows for bidirectional sealing, meaning the valve can provide effective closure regardless of the flow direction. 

This feature enhances the versatility of the valve and ensures reliable performance in varied operating conditions.

Reduced Torque Requirement

Compared to traditional butterfly valves, triple offset designs generally require lower torque for operation. 

This contributes to efficient actuation and ease of use, especially in large-sized valves.

Triple-Offset valves use three offsets to create a high performance and low friction seal.

The fundamental feature of the valve design is the three offsets, these are highlighted in the 3D figure below:

Offset 1 - an offset between the shaft centreline and seat

Offset 2 - an offset between the centreline of the pipeline and the valve shaft

The valve shaft is offset from the centre line in both the X and Y axis, which makes up the first two offsets.

Offset 3 - An angular offset of the seating faces creating the conical geometry of the seat faces

The third offset consists of a conical angle on the sealing faces meaning the sealing faces only come into contact at the point of sealing.

Bubble-Tight Sealing

The triple offset design provides bubble-tight sealing, ensuring a complete and tight closure of the valve. 

This is particularly advantageous in applications where leakage prevention is critical, such as in high-pressure or hazardous fluid environments.

Minimal Wear and Tear

The continuous contact-less rotation and seating characteristic of the triple offset design result in minimal wear and tear. 

This leads to an extended service life and reduced maintenance requirements, making it a cost-effective choice in the long run.

High-Temperature Resistance

Triple offset butterfly valves are suitable for high-temperature applications due to the use of materials that can withstand elevated temperatures. 

This makes them ideal for industries such as petrochemical, refining, and power generation.

Size: 3"(DN80)-96"(DN2400) 
Pressure: 150LB-600LB / PN16- PN100 
Material: WCB, WCC, WC6, WC9, C5, C12, C12A, LCB, LCC, LC1, LC3, CF8, CF8M, CF3, CF3M, CF8C 
Medium: Water, oil, gas, steam 


Standards: 
1) Design and manufacture:  MSS SP-68 
2) Face to face/end to end: ANSI B16.10 
3) Flange dimensions: ANSI B16.5A 
4) Butt welding dimensions: ANSI B16.25 
5) Pressure temperature rating: ANSI B16.34