Jafar 4493SQ 운영 매뉴얼 - 페이지 5

{카테고리_이름} Jafar 4493SQ에 대한 운영 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Jafar 4493SQ 14 페이지. Double eccentric flanged butterfly valve

The following figures (fig.1) show the position of the eccentrics for double eccentric butterfly valves.

Fig. 1. Disk positions depending on the butterfly valve opening angle.

The first eccentric (a) causes the disc rotation axis to be outside of the sealing surface axis. Such construction

ensures full sealing around the entire circumference between the body welded seat and the rubber sealing ring.

The second eccentric (b) is an offset of the butterfly valve disc axis in relation to the butterfly valve axis (body

axis).

It serves to minimise the compressive stress of the sealing ring when the butterfly valve is opened.

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The valve without a gearbox forms an assembly that can be adapted to various control devices (gearboxes,

actuators). To ensure proper leak-tightness of the valve, an operator can only be installed by an

authorized service of Fabryka Armatur JAFAR. The operator must ensure a stable closure actuation angle

within:

➢ 0 - 90 for the fully open and fully closed motion;

➢ 15 - 90 for flow control (damping);

and the proper operating torque (see Table 1). Long-term operation of the valve with an operator as a flow

damping valve may cause wear of the sealing insert and result in leaks through the closed valve.

OPERATING MANUAL

07-2022

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