31000 Butterfly valve with weld ends of carbon steel PN 25 DN 80 - 350

Operation
Butterfly valve 31000 is used in industrial pipelines for demanding on-off and regulating tasks as well as in distric heating. It is tight to both directions of flow.

Nominal pressure 25 bar

Closing pressure difference
CS 20 bar
TS 25 bar

Temperature and tightness class
AISI 316 max +260 °C/ min -40 °C ISO5208, EN 12266-1 RATE B
PTFE+C max +180 °C/ min -40 °C ISO5208, EN 12266-1 RATE A

The max pressure difference depends on the working temperature.

Design
This wafer type butterfly valve is installed between flanges. The body material is cast carbon steel. Double eccentric disc and shaft are 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 bare shaft, handlever, manual gear, electric, pneumatic or hydraulic actuator according to customer’s needs.

Face-to-face length according to ISO 5752, EN 558-1 series 25 DIN 3202 K2

Connection: Between flanges DIN2501 PN25, PN16, PN10, ANSI CLASS 150

Nominal sizes
DN 80 - 350

Product code
31000CS_ _ _ metal seated
31002TS_ _ _ teflon seated

Special order for steam, max 8 bar/ 170°C
31001CS_ _ _

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

31000_uk.pdf (113.1 kb)