Functioning Principle; Installation; Installation Conditions - KSB BOAX-B Instructions De Service

6.4

Functioning principle

Description
The valve consists mainly of a body (100), operating shaft (213), shaft
(210), disc (550) and rubber liner (413).
The in- -house designed formulated and manufactured rubber liner
achieves the leak tightness at shaft passages, pipe flanges and
downstream/upstream around the disc.
Disc- - shaft connection: The disc (550) is connected to the operating
shaft by key (s), or splines.
DN £ 200 : indémontable connection
Anti blow- - out device:
- - DN £ 200 : realized with a connection tightened of the operating
shaft into the disc and the shaft into the body.
- - DN > 200 : realized with an anti blow- -out device which prevents the
shaft to burst off the body in case of shaft failure.
This function is achieved by additional parts.
Operation: The valves are quarter- -turn operated manually
handles or gear box or hydraulic, pneumatic or electric actuators
mounted on the valve top plate (as per ISO 5211 standard).
7.

Installation

7.1 General
ATTENTION
To avoid leakage, deformation or rupture of the body,
the piping should be laid out in such a way that no thrust or bending
forces act on the valve bodies (Part Nr. 100) when they are installed
and operational.
ATTENTION
The sealing faces of the flanges must be clean and
undamaged (Ra £ 25mm).
It is prohibited to add any additional gasket (except electric
insulation gasket, please consult us) between body and piping
flanges. To insert the valve between flanges, pull apart the two pipes
flanges to obtain sufficient clearance between flange face and valve
seat cheeks. All holes provided in the flanges must be used for the
flange connection.
lf construction work is still in progress, non- -mounted valves
must be protected against dust, sand and building material etc.(cover
with suitable means).
Do not use valve handles and gear handwheels as footholds!
Valves and pipes used for high (> 60
temperatures must either be fitted with a protective insulation, or there
must be warning signs fitted showing that it is dangerous to touch
these valves.
lf a valve is used as end-valve in a pipe, this valve should be
protected against unauthorized or unintentional opening to prevent
personal injury or damage to property.
30
Valves sizes DN £ 600 may be installed in any position.
Valves sizes DN > 600 have a mountung preferential direction
horizontal shaft following the figure hereafter. This is the most
favourable position because:
- -The weight of the disc and shafts is borne by the two bearings,
- - the pivot bearing is relieved,
- - it is a guarantee of long valve life, specially in the case of fluids
containing solids, where sold particles tend to accumultate on the
bottom of the pipe (during the closing, the reduction in cross- -section
causes a local increase in velocity which results in a " sweeping"or
" cleaning"of the liner).
The mounting, vertical shaft, actuators ace upwards is allowable.
by
7.2
7.2.1.
1 DN
1
1 DN
° °
C) or low (< 0 C)
Also valid for valve placed at pump dischange.
For lengths shorter than those figured 1, 2, 3 and 4, the disc must
be in an opening position of 70

Installation conditions

Recommended minimum distances between the
position of the valve and of the T- -piece or elbow.
3
5- -6 DN
DN
DN
2
4
3 DN
DN DN
° .
3 DN 1 DN
5
DN
3 DN
1 DN
6
DN