KSB BOAX- B Operating Instructions Manual Download Page 38

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ATTENTION

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 with a connection tightened.
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 by

handles or gear box or hydraulic, pneumatic or electric actuators
mounted on the valve top plate (as per ISO 5211 standard).

Installation

7.1

General

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.

The sealing faces of the flanges must be clean and

undamaged (Ra





m).

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.

7.2

Installation conditions

7.2.1.

Recommended minimum distances between

the position of the valve and of the T- piece or

elbow.

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! Do
not carry the valve by the actuator (handles, wheels, etc..).

Valves and pipes used for high (> 60

C) or low (< 0

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.

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

1 DN

3 DN

1 DN

5--6 DN

1 DN

3 DN

1 DN