Pfeiffer Chemie-Armaturenbau GmbH
Pfeiffer Chemie-Armaturenbau GmbH • Phone: +49 2152 2005-0 • Fax: +49 2152 1580 • E-Mail: [email protected] • Internet: www.pfeiffer-armaturen.com
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EB 26a_EN
Stack the spring washers ( 11 ) on the V-ring packing.
Refer to Fig. 5 for the arrangement of the spring washers.
Press the bearing bushing ( 8 ) into the packing fl ange ( 6 ).
Place the packing fl ange ( 6 ) over the shaft onto the body.
Use the greased cap screws ( 15 ) to align the packing and
tighten the screws evenly in a criss-cross pattern.
Note:
Before performing a leak test, open and close the
valve several times. This allows the ball to centre
itself on the seat rings and provides optimal shut-off
performance.
Assembly of the ball valve is now completed.
4.4 Tightening
torques
On joining the two body halves, tighten the screws evenly in
criss-cross pattern using the following specifi ed torques.
DN
Body halves
Packing
Qty.
Screws
Tighten.
torque
Qty.
Screws
Tighten.
torque
15
4
M8x20
22 Nm
4
M4x10
5 Nm
25
4
M10x20
49 Nm
4
M6x8
6 Nm
40
5
M10x25
49 Nm
3
M8x12
14 Nm
50
7
M10x25
49 Nm
3
M8x12
14 Nm
80
6
M16x30/
M16x40
105 Nm
4
M10x16
30 Nm
100
8
M16x30/
M16x40
105 Nm
4
M10x16
30 Nm
Table 3 – Tightening torques
5 Assembly of special ball valves
5.1 Assembling the high-temperature ball valve
(Version with HSB metal seals)
5.1.1 Preparation for assembly
Before assembling the ball valve, carefully clean all parts and
place them on a soft surface (rubber mat or similar).
Sealing parts are nearly always soft and very sensitive. Take
particular care when handling the sealing surfaces to ensure
that they do not get damaged.
Fig. 6 – High-temperature Series 26a Ball Valve => Refer to Table 4 (page 7) for parts list
Notice:
A high-performance grease paste (Molykote 1000)
is used during manufacturing to prevent the screws
from cold welding in the bodies.
Notice:
Do not use these valves for oxygen service.
Note:
The position and arrangement of the individual
parts shown in the detail drawing (Fig. 7) are to be
observed during assembly
Notice:
Graphite seals are very sensitive and must always
be handled with great care, otherwise the sealing
performance cannot be guaranteed.
It is not necessary to lubricate the seat sealing.
Lubrication causes the operating performance to
deteriorate. The seat ring and ball are mate-lapped
and must only be installed as a unit. Do not install
a seat ring which has been lapped-in with another
ball. Do not perform the lapping-in yourself. The seat
ring in DN 15 version is spring-loaded and sealed on
both sides of the ball by just one graphite ring seal.
