Flowserve Trunnball Manual do Utilizador descarregar pdf (Página 2)

4. Installation

Before installing the valve, ensure that

the pipework is

free from impurities

, that the pipe ends between which

the valve is to be installed are parallel and are correctly

aligned, and that the distance between the pipe ends

corresponds to the valve length, including gaskets.

The

valve must not be used for drawing together or aligning

incorrectly run pipes

as this will cause needless loads on

the valve and pipe which may lead to difﬁ cult damages

during operation. See Fig. 2.

Wrong installation Correct installation

Fig. 2. Ensure that the pipe ends align and have the

correct distance

NAF-Trunnball valves can be installed in any position

and with optional ﬂ ow direction.

However, we recommend that, if installed in a horizontal

run of pipe, the valve should be mounted with the stem

pointing vertically upwards. If the valve is installed in a

vertical run of pipe, the body half (2) according to ﬁ g. 3

should be at the top to enable the ball and the seat ring to

be replaced without the need for removing the valve from

the pipework.

The pipes should be supported on each side of the

valve

, in order to relieve the valve of loads and avoid

vibrations.

Locate the valve so that it will be easily accessible

for

inspection and service, particularly if the valve is equipped

with an actuator and a valve positioner.

5. Flange Gaskets

Gaskets with sizes according to ANSI B16.5 1988, Table

E1 Figure E2, SS 359 or DIN 2690 are recommended.

6. Starting up

Before starting up, ﬂ ush the pipework - with all valves

in the open position - so that any impurities that may

damage the sealing surfaces of the valve and impede its

operation will be ﬂ ushed away.

See also Fi 41.82 - Instruction Manual for NAF valve

positioner giving useful hints for starting up.

7. List of Materials and Spare Parts

Item No.

Qty.

Part

Material

Body EN 1.4408/CF8M

Ball hard chrome EN 1.4408/CF8M/Hcr

Seat ring Alloy 6

Stem, assembly EN 1.4460

Circlip Spring steel

Backing ring PTFE

Upper lid EN 1.4436

Screw A4

Packing box PTFE/PTFE+25%C

Bushing PTFE+1.4401

Anti-friction washer EN 1.4436

Sealing ring PTFE

Screw A4-80

Nut A4

Screw A4-80

Key A4

Ball EN 1.4408/CF8M

Ball Alloy 6

Seatring EN 1.4436/PTFE+25%C

Bearing PTFE+1.4401

Trunnion plate EN 1.4470

Spring ASTM A316

Sealing ring PTFE+15%Graphite

O-ring FPM

Spring ASTM A316

Supporting ring Spring steel

Washer A4

Supporting ring PTFE

O-ring EPDM

Bushing PTFE reinforced carbon

Sliding washer PTFE reinforced carbon

1 2 3 4 5 6 7 8

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