Jafar 4496 Kullanım Kılavuzu - Sayfa 8

Kontrol Ünitesi Jafar 4496 için çevrimiçi göz atın veya pdf Kullanım Kılavuzu indirin. Jafar 4496 11 sayfaları. Concentric butterfly valves

Horizontal piping –

vertical orientation

Fig. 2. Orientation of the valve closure pivot shaft relative to the piping plane shown for P/N 4497 DN100

The optimum installation orientation of concentric butterfly valves is to have the closure panel axis vertical with

the closing movement of the closure panel bottom opposite to the medium flow (Fig. 3). While the valve is being

closed or opened, the medium is at its maximum flow rate and entrains the contamination settled in the

neighbouring part of the pipeline. The valve installation shown in Fig. 3 considerably extends the service life and

operating reliability even with media loaded with contaminants which by their weight tend to settle down in the

piping. A consequence of this is that the deposits can be entrained from the upstream of the valve by the maximum

possible flow passing the bottom part of the valve closure during the opening operation (Fig. 4).

Fig. 4.

A – Incorrect valve closure pivot

shaft orientation

When designing the installation, consider that the horizontal orientation of the valve closure pivot shafts is the best

for operating performance and reliability:

the weight of the pivot shafts and the closure rests on both bearings;

the front-end bearing of the pivot shaft is unloaded;

the valve operating life is extended, especially when the liquid medium contains solids which tend to

settle at the bottom of the piping.

If the valve is installed with the valve closure pivot shafts aligned vertically, the solids are not effectively entrained

by a super-nominal flow; this may result in damage to the valve closure edges or the sealing ring mating edges.

Any change in the operating conditions must be consulted with the manufacturer beforehand.

OPERATING MANUAL

Horizontal piping – horizontal

orientation

Fig. 3. Recommended installation method

shown for flange-to-flange valves

B – Incorrect valve closure pivot

shaft orientation

07-2021

Vertical piping

C – Correct valve closure pivot shaft

orientation

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