Symbols Used; Defi Nition Of Terms; Intended Area Of Use; Technical Data - GEM 490 Installation, Operating And Maintenance Instructions For The Installer And The User

2.3

Symbols used

Danger - hot surfaces!
Danger - corrosive materials!
Danger - bodily injury!
Hand: indicates general information
and recommendations.
Bullet point: indicates the tasks to
G
be performed.
Arrow: indicates the response(s) to
®
tasks.
Enumeration sign

3 Defi nition of terms
Working medium
The medium that fl ows through the butterfl y
valve.
5

Technical data

Flow velocity
Maximum permissible fl ow velocity [m/s]
PS
[bar]
Liquid media
up to 6 2.5
6 < PS ≤ 10
10 < PS ≤ 16
PS > 16
DIN EN 593:2012-03 / EN 593:2009+A1:2011 (D)
Working medium
Gaseous and liquid media which have no negative impact
on the physical and chemical properties of the disc and seat
material.
Max. perm. temp. of working medium
Standard TFM™ (PTFE)
No water hammer permissible
490
Gaseous media
[at ≈ 1 bar]
25
3 30
4 35
5 40
-20 to 200°C
4

Intended area of use

Use the butterfl y valve only for the
intended purpose!
® Otherwise the manufacturer liability
and guarantee will be void.
Use the butterfl y valve only in
G
accordance with the operating
conditions specifi ed in the contract
documentation and in the installation,
operating and maintenance
instructions.
The butterfl y valve may only be used in
G
potentially explosive zones confi rmed
in the declaration of conformity (ATEX).
 The GEMÜ 490 butterfl y valve is
designed for installation in piping
systems. It controls a fl owing medium
after a manual operator (GEMÜ 497),
pneumatic operator (GEMÜ 491) or
motorized operator (GEMÜ 498) has
been mounted.
 The butterfl y valve may only be used
providing the product technical
criteria are complied with (see
chapter 5 "Technical data").
 Do not paint the bolts and plastic parts of
the butterfl y valve!
Installation conditions
Installation position
Flow direction
Max. perm. pressure of working medium
DN 40 - 450
DN 500 - 600
DN 700 - 1050
24 / 40
WARNING
Any way, preferably
horizontally
For DN ≥ 300, install
the butterfly valve
horizontally so that
the lower edge of the
disc opens in the flow
direction.
Optional
10 bar
6 bar
3 bar