What is the difference between resilient seat butterfly valve and resilient seal butterfly valve?
In the valve industry, two terms often confused are resilient seat butterfly valve and resilient seal butterfly valve. Of course, without further ado, the terms resilient seated butterfly valve and resilient seal butterfly valve are often used interchangeably. Both refer to butterfly valves that use rubber or other elastic materials to achieve a seal.
However, today we will rigorously distinguish Resilient Seat VS Resilient Seal Butterfly Valve.
1. Resilient Seat Butterfly Valve
This refers to a butterfly valve whose sealing seat is made of an elastic material (such as EPDM, NBR, Viton, or PTFE rubber).
This “seat” serves both as a seal and as a support surface for the valve disc.
The key component of the seal is the valve seat itself. For example, in a centerline butterfly valve, the seat is located on the valve body, enclosing the entire contact surface of the valve body with the media.
Typical structure: “Rubber-lined body + metal disc”
2. Resilient Seal Butterfly Valve
This emphasizes the elasticity of the sealing structure. The “seal” can be located on the valve body, on the edge of the valve disc, or between the two.
It emphasizes the elastic characteristics of the sealing performance, rather than simply referring to the seat material.
Typical Structure:
Double-Eccentric Butterfly Valve: The seal is located at the edge of the valve disc and is usually made of rubber.
In a high-performance butterfly valve (HPBV), the seal is an independent elastic ring embedded in the contact area between the valve body and the valve disc.
3. Summary
In short, Resilient Seat VS Resilient Seal Butterfly Valve, the term “resilient seat” emphasizes the valve seat structure, while the term “resilient seal” emphasizes the sealing function. Both utilize the same principle: sealing is achieved through deformation of the elastic material.
However, the term “resilient seal butterfly valve” encompasses the term “resilient seat butterfly valve.” This is because the term “resilient seal butterfly valve” refers only to double-eccentric butterfly valves, high-performance butterfly valves, and centerline butterfly valves, while the term “resilient seal butterfly valve” refers only to centerline butterfly valves.