Valve Comparison Guide
Concentric vs High Performance Butterfly Valve: Design & Application Differences
Concentric (centric) vs double-offset and triple-offset high performance butterfly valve comparison — shutoff class, pressure rating, seat type, temperature range, and selection guide.
Overview
A concentric butterfly valve (also called a centric or resilient-seated butterfly valve) has the disc stem passing through the disc centreline and the disc sealing against an elastomeric seat (EPDM, NBR, neoprene) that wraps the full circumference. The disc contacts the seat 360° throughout its travel — generating friction and wear. Concentric butterfly valves are the most economical butterfly valve type, available in wafer, lug, and double-flanged configurations per API 609 Category A. They are limited to moderate pressure (up to Class 150 / PN 16 in most designs) and temperatures governed by the elastomeric seat material (−40°C to +120°C for EPDM). Widely used in water distribution, HVAC, and light industrial service.
API 609 Category A, EPDM seat, DN80–DN1200, PN10/16, cast iron or ductile iron body
High performance butterfly valves (HPBVs) use geometric offsets in the disc stem to produce a cam-action sealing mechanism that eliminates disc-to-seat contact except at the final few degrees of closing. Double-offset valves have two geometric offsets producing a cam motion; triple-offset valves (TOVs) add a third conical seating geometry, achieving bi-directional zero-leakage metal-to-metal shutoff. HPBVs cover API 609 Category A (wafer/lug) and Category B (full-lug and double-flanged with fire-safe rating), and are rated up to Class 600 (triple-offset). PTFE and metal seats are both available. Used in oil & gas, chemical, power generation, and LNG service requiring high shutoff integrity.
API 609 Category B, triple-offset, metal seat, Class 300 or Class 600, WCB or SS316, API 607 fire-safe
Pros & Cons
Concentric (Centric) Butterfly Valve
High Performance Butterfly Valve (Double / Triple Offset)
Concentric (Centric) Butterfly Valve vs High Performance Butterfly Valve (Double / Triple Offset) — Specification Comparison
| Parameter | Concentric (Centric) Butterfly Valve | High Performance Butterfly Valve (Double / Triple Offset) |
|---|---|---|
| Disc Geometry | Concentric — stem through disc centre | Double or triple offset — cam-action sealing |
| Seat Type | Elastomeric (EPDM, NBR, neoprene) | Soft (PTFE/RPTFE) or metal (Stellite, SS) |
| API 609 Category | Category A (most designs) | Category A or B (double and triple offset) |
| Max Pressure Class | Class 150 / PN 16 typical | Class 150–600 (double offset), Class 900 (triple offset) |
| Temperature Range | −40°C to +120°C (EPDM seat limit) | −196°C to +600°C (alloy-dependent) |
| Fire-Safe Rating | Not available — elastomeric seat | API 607 fire-safe available with metal seats |
| Shutoff Class | Class IV (ASME FCI 70-2) | Class VI bubble-tight (metal seat, triple offset) |
When to Use Each
Use Concentric (Centric) Butterfly Valve when:
Use High Performance Butterfly Valve (Double / Triple Offset) when:
Decision Guide
Specify concentric butterfly valves for water, HVAC, and large-bore low-pressure service where economy and bore size are the primary drivers and fire-safe rating is not required. Specify double-offset HPBVs for Class 300 process service in chemical and light oil & gas applications. Specify triple-offset butterfly valves for hydrocarbon isolation, fire-safe service, LNG cryogenic, high-temperature steam, and any application requiring bi-directional metal-to-metal shutoff — this is the valve of choice for refinery, petrochemical, and offshore block isolation.
Frequently Asked Questions
Can concentric butterfly valves be used in oil and gas service?
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