OPERATING MANUAL
07-2021
5/11
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Valve control mode: the standard version of the valve has the clockwise closing sense of rotation. The closing
sense of rotation can be opposite on special order.The standard version control is operated with:
A lever: for DN40-DN200, applicable to P/N 4495, 4496, and 4497;
A self-retarding worm gearbox: for DN250-DN600, applicable to P/N 4495;
for DN250-DN1200, applicable to P/N 4496 and 4497;
On special request, the valves can be operated with:
Partial-turn electric operator (drive unit);
An electric drive worm gearbox;
A pneumatic operator (drive unit).
•
Connection flanges (P/N 4496) and lugs (P/N 4495 & 4497) are fabricated to EN 1092-2 (Flanges and their
joints. Circular flanges for pipes, valves, fittings and accessories, PN. Cast iron flanges) and in sizes suitable
for nominal pressure ratings. The concentric butterfly lug valve (P/N 4495) features threaded holes in the
connection lugs. The concentric butterfly wafer valve (P/N 4497) standard version features a universal bolt
hole pattern (PN10/PN16) for sizes from DN40 to DN350. On special request, the universal bolt hole pattern
is available for sizes from DN400 to DN600.
•
The installation (face to face) length and its tolerance are per EN 558 (Industrial valves. Face-to-face and
centre-to-face dimensions of metal valves for use in flanged pipe systems. Valves with PN and class marking);
Series 20 applicable to:
P/N 4495 (DN40-DN600);
P/N 4496 (DN150-DN1200)
P/N 4497 (DN40-DN1200).
•
P/N 4496 concentric butterfly flange valves feature a non-replaceable elastomer insert (end seal). The end seal
comprises an aluminium ring on which a rubber sealing ring is mounted. The lug valves (P/N 4495) and the
wafer valves (4497) feature either of the two end seal version:
A
replaceable
insert
(dovetail
style)
in
the
size
range
of
DN40-DN350.
The end seal comprises an aluminium ring only.
A non-replaceable insert in the size range of DN400-DN1200 (in wafer valves) and DN400-
DN600 (in lug valves). The insert design is the same as for P/N 4496.
•
The valve shaft is assembled with the closure plate as follows:
Pinned joint: P/N 4495 (DN400-DN600), P/N 4496 (DN150-DN1200), and P/N 4497 (DN400-
DN1200)
Spline joint: P/N 4495 (DN40-DN350) and P/N 4497 (DN40-DN350)
•
Soft-seal concentric butterfly valves (P/N 4495, 4496, and 4497) in the size range of DN40-DN1200 have a
closure formed by a two-arm plate which pivots around an axis perpendicular to the medium flow. The pivot
shaft(s) are held by the necks, mounted on additional bearing sleeves. The pivot shafts are sealed by the
packing assembly, comprising an arrangement of o-rings. The valve closure is formed by a closure plate and
an elastomer insert which isolates the valve body on one end from the medium flow. The shaft is operated by
a lever, a gearbox, or an operator drive unit.
•
The valve without a gearbox forms an assembly that can be adapted to various operators (drive units). 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 to 90
°
for the fully open and fully closed motion;
15
°
to 90
°
for flow control (damping);
and the proper operating torque (see Table 1 or 2). 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.
