Butterfly Valve 306

DN50-2000 PN10-100

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Comprehensive Documentation

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Technical Specifications

Nominal diameter DN 50-2000
Nominal pressure PN10, PN16, PN25, PN40, PN63, PN100
Medium temperature -196 °C ... +600 °C
Types of Valve End Connections Welded, Flanged, lug
Leakage Class «А»
Mounting Position Any, except for downward-driven devices
Types of Control — manual (lever) 
— manual (handwheel)
— manual (gearbox)
— pneumatic actuation 
— electric actuation
Warranty Period 12 months
Average Service Life 10 000 cycles
Guaranteed Service Life Not less than 5000 cycles

Technical Drawings and Dimensions

Nominal diameter PN16

Table of Basic Dimensions

DN	D1, mm	L, mm	n-ød
80	160	64	4-M16
100	180	64	4-M16
125	210	70	4-M16
150	240	76	8-M20
200	295	89	12-M20
250	355	114	12-M24
300	410	114	12-M24
350	470	127	16-M24
400	525	140	16-M27
450	585	152	20-M27

Tabular values for diameters DN500–DN2000 are available upon request

Product Description

Triple Eccentric Butterfly Valves – Model 306 are designed for regulating and shutting off the flow of working media.

A distinctive feature of this valve is its high performance (a large number of operating cycles compared to valves with a symmetrical disc). The principle of triple eccentricity eliminates friction during valve opening and closing, and ensures even sealing pressure along the entire seat circumference. This design enables use in high-temperature applications.

Design features of the model:

Metal-to-metal sealing for operation at temperatures up to +600°C
Metal/graphite sealing ensuring tightness class “A” in one or both directions
Replaceable sealing ring (graphite or metal)
Low operating torque (facilitates actuator selection)
Wide selection of body and disc materials for use in aggressive environments
High durability (number of cycles) compared to valves with symmetrical design
External bearing design suitable for high-temperature service

Sealing materials:

🔹 AISI 304 + Graphite, AISI 316 + Graphite, Duplex 2205 + Graphite, Metal

Bodies and discs of valves model 306 can be made from various materials depending on the application:

🔹 Ductile iron
EN-GJS-400-15 / GGG40

🔹 Carbon steel
A216 WCB (1.0619, GP240GH)

🔹 Stainless steels (corrosion-resistant)
A351 CF8 (1.4308) / AISI 304 / A182 F304 (1.4301)
A351 CF8M (1.4408) / AISI 316 / A182 F316 (1.4401)
A351 CF3 (1.4306) / AISI 304L / A182 F304L
A351 CF3M (1.4409) / AISI 316L (1.4404)
AISI 316Ti (1.4571)
AISI 904L (1.4539)

🔹 Low-alloy steels
A352 LCB

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