Flanged Expansion Butterfly Valves

Port	china
Packaging	Custom, box
Lead Time	15 - 25 Days

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. Structure	: Compact, lightweight, and space-saving design.	material	steel
Installation:	Easy to install

Product Details

Flanged Expansion Butterfly Valve

Model: SD341X
Nominal Diameter: DN50–2000mm
Nominal Pressure: PN0.6–1.6MPa
Applicable Temperature:

Soft Seal: X: -40℃ to 90℃; XF: -20℃ to 200℃
Hard Seal: Carbon Steel: -29℃ to 425℃; Stainless Steel: -40℃ to 650℃
Applicable Medium: Water, air, natural gas, oil, and mildly corrosive fluids

Actuation Methods:

Worm gear, electric, pneumatic, hydraulic

Valve Body Material:

WCB, QT450-10, stainless steel

Manufacturing Standards:

JB/T8527-97, GOST 122387-89

Flange Standards:

GOST 9113-2000, GOST 17241.6-1998

Product Overview

The flanged expansion butterfly valve is designed to automatically compensate for thermal expansion and contraction in pipelines, facilitating easy installation and removal. It is ideal for industrial pipelines in petroleum, chemical, power, paper-making, water supply & drainage, and municipal construction industries, where temperatures do not exceed 120℃ and nominal pressure is up to 1.6MPa. The valve effectively regulates flow and isolates fluids.

Working Principle

The flanged expansion butterfly valve is available in three types:

Standard Type: Installed according to the expansion joint's design specifications. If limit bolts are required, they must be specified during design.

Fixed-Limit Type: Provides both expansion and limiting functions, allowing the expansion section to be fixed when necessary. It offers greater functionality and a wider range of applications.

Extended Type: Features an extended expansion section to match the required length without considering the expansion amount. This type is particularly useful for pipeline renovations where existing valves need replacement without cutting and modifying pipe connections. If limit measures are needed, they should be specified during design.

Product Features

Adjustable and replaceable sealing components ensure reliable sealing performance.

Unique structure, flexible design, lightweight, easy to operate, and quick to open/close.

Compensates for pipeline expansion and contraction due to temperature changes while facilitating maintenance and replacement.

Installation Precautions

Before installation, the valve should be laid flat to prevent damage. Do not randomly knock or collide with it, and do not remove the support bracket during operation.

The valve is shipped at its minimum structural length. During installation, extend it to the designated installation length.

If the pipeline gap exceeds the valve’s expansion range, adjust the pipe spacing instead of forcibly stretching the valve, as this may cause damage.

The valve can be installed in any direction. When used for temperature compensation, additional supports must be installed at both ends along the pipeline axis after pipeline installation to prevent the expansion section from being pulled out.