The difference between different butterfly valves

Choosing the wrong type of valve can be detrimental to your operation. There are several different types of butterfly valves on the market, including high performance, resilient seat, and triple eccentric.

 

Offset in Butterfly Valves

When looking at butterfly valves, the difference between high performance, resilient seat, and triple eccentric butterfly valves has to do with valve offset. 

 

High Performance Butterfly Valves

This popular valve is also known as a high performance butterfly valve or double offset butterfly valve. The valve has two off-centered stems. This creates a cam action during the application.

 

◮1 ST Offset: The axis of the shaft is behind the centerline of the sealing point of the disc seat.

◮2 Second Offset: The axis of said shaft is eccentric to the center of the valve/tube line.

 

High performance butterfly valves are typically used in: power generation, pulp and paper, HVAC, chemical, oil and gas, water and wastewater treatment, shipbuilding   

 

High performance butterfly valves are available for higher pressures than zero offset styles. Double offset in carbon steel, stainless steel, Hastelloy, and other body materials to ANSI Class 600 ratings, with a variety of Teflon seats and fire-rated designs with metal support seats.


Lug Type Butterfly Valve

 

Resilient Seats

Also known as the concentric design, this is common in general purpose "resilient seat" or "rubber seat" butterfly valves. The stem and flap are centered in the seat, and all of these are centered in the body. The disc is always in contact with the seat.

 

An advantage of this type of valve is that the media passing through the valve does not contact the valve body because the seat is constructed as a sleeve or cartridge inside the valve body.

 

Zero offset butterfly valves are used for basic and specialty liquid and gas applications up to 200 PSI and 400 degrees Fahrenheit. Zero offset butterfly valves can handle chemicals, coatings, food, certain solids, and abrasive applications. 

 

Zero offset butterfly valves are available in epoxy coated cast iron and stainless steel and feature a variety of seat materials such as Nitrile, EPDM, VITON, Teflon, natural rubber, and more.

Comments

Post a Comment

Popular posts from this blog

Do you Know the Development History of Butterfly Valves?

Image
As a   Flange Butterfly Valve Supplier , let’s learn about the development history of Butterfly Valve today! In order to meet the use requirements of industrial applications such as high and low temperature, strong erosion, long life, etc., the metal sealing butterfly valve has been greatly developed in the past ten years. With the application of high temperature resistance, low temperature resistance, strong corrosion resistance, strong erosion resistance, and high strength alloy materials in butterfly valves, metal sealed butterfly valves have been widely used in industrial fields such as high and low temperatures, strong erosion, and long life. The emergence of butterfly valves with large diameter (9750mm), high pressure (2.2kN/cm2), and wide temperature range (-102～606℃) has brought the technology of butterfly valves to a whole new level. Wafer Type Butterfly Valve Due to the application of computer-aided design (CAD), computer-aided manufacturing (CAM) and flexible manufacturing s
Read more

What is the Material Identification Method of Butterfly Valve?

Image
Nowadays, due to the development of science and technology and the advancement of materials, the materials used to manufacture butterfly valves are becoming more and more diverse. When a user chooses a butterfly valve, the material is often an important indicator for his consideration.   So, without relying on the instructions of Flange Butterfly Valve Supplier , how can users identify the material of the butterfly valve by themselves? DIN2501 Flange Butterfly Valve 1. Chemical and spectral analysis The use of chemical analysis to determine the content of various elements in butterfly valve materials has been a long-standing method, and this method can be said to be very reliable based on long-term use. The spectral analysis means that the material of the butterfly valve emits spectrum under high temperature and high energy excitation, so the material of the butterfly valve can also be determined by spectral analysis. 2. Spark identification When grinding metal materials, sparks are of
Read more

Eccentric Butterfly Valve

Image
Eccentric Butterfly Valve We offer double eccentric butterfly valves  in DN200-2800 designed with durability in focus. The tilted and firmly secured disc, the optimised seal design and the corrosion protected shaft end zones are all features that exceed the market standards. Longer service life due to tilted disc The tension on the disc is released after a few degrees of opening which minimises wear of the disc seal. Furthermore, the design minimises the compression of the sealing which ensures low operating torques. Eccentric Butterfly Valve Applications Our KXC   double eccentric butterfly valves  are well suited for water supply applications. More information about KXC Butterfly Valve , please click here
Read more