Operation
The welded butterfly valve 31300 with weld ends is specially designed for district heating. It can be used as an on-off or control valve. Högfors butterfly valve is tight in both flow directions.

Nominal pressure 25 bar

Closing pressure max 16 bar

Tightness class ISO 5208, EN 12266-1, RATE B

Temperature
max +260 °C / min -40 °C (DN200 - 1000)
max +260 °C / min -20 °C (DN1200 - 1400)

The max pressure difference depends on the working temperature.

Design
The body of the butterfly valve with weld ends is carbon steel. The double eccentric disc and shafts are made of stainless steel. Replaceable seat ring is also stainless steel. The shaft packing box is a combination of graphite rings and O-rings which are possible to tighten while in pipeline and are also replaceable.
The butterfly valve is delivered with a bare shaft or with an actuator.
You can choose either bare shaft, manual gear, electrical, pneumatic or hydraulic actuator.

Nominal sizes
DN 200 - 1400

Product code
31300CS_ _ _ Z bare shaft
31300CS_ _ _ M manual gear

Special order for steam
31301CS_ _ _ Z bare shaft
31301CS_ _ _ M manual gear

Conform with the requirements of the Council Directive 97/23/EC on Pressure Equipement, marking:
Class: Gas, group 1

31300_uk.pdf (117.1 kb)