NEEDLE VALVES, TYPE ZWZ 11 and ZWZ 12

NEEDLE VALVES, TYPE ZWZ 11 and ZWZ 12
APPLICATION AREA:
The needle valves are used in measuring systems of level gauges, flow meters and other industrial automatic
applications.
For instance, they can be used to disconnect the measuring circuit right at the tank where fluid level is measured
inside or cutoff the measuring tube.
DESIGN:
The bodies of cut-off valves are manufactured in two material variations:
carbon steel (1.0570 – ZWZ 11 and ZWZ 12) and acid-resistant steel
(1.4571 – ZWZ 11). In ZWZ 11 valves, the body is welded together with
a bonnet, while in ZWZ 12 valves, the body with bonnet is made from a
forging.
Internal parts of cut-off valves in the carbon steel manufacture are made of
stainless steel, and in acid-resistant valves, the parts directly coming into
contact with an aggressive medium are made of acid-resistant steel, with
the exception of the needle made of stainless steel, which is quenched
and tempered.
In ZWZ 11 valves in the steel version, the seat is padded with the use of
an acid-resistant electrode, and in ZWZ 12 valves, the seat is made of
acid-resistant steel, quenched and tempered, and then screwed in the
body.
The parts that are exposed to the risk of corrosion are protected by
appropriate coatings. Ball endings of valves and connecting stubs
are suitable for welding to pressurized pipes ∅12 x 2 mm (ZWZ 11)
i ∅16 x 3 mm (ZWZ 12). The ergonomic handwheel are die pressed from
steel sheets, which facilitates valve operation.
TECHNICAL PARAMETERS:
Working temperature: -10…+300 [°C] - for the steel body - S355J2G3 (1.0570),
-196…+400 [°C] - for the acid resistant body - X6CrNiMoTi 17-12-2 (1.4571)
PN
Material: S355J2G3 (1.0570) wg PN-EN 1092-1
Temperature [°C]
20 50 100 150 200 250 300 350 400
Allowed working pressure [bar]
PN160 160 160 148,5 140,9 133,3 121,9 110,4 - -
PN320 320 320 297,1 281,9 266,6 243,8 220,9 - -
PN350 400 400 325 308,3 291,6 266,6 241,6 - -
PN
Material: X6CrNiMoTi 17-12-2 (1.4571) wg PN-EN 1092-1
Temperature [°C]
20 50 100 150 200 250 300 350 400
Allowed working pressure [bar]
PN160 160 160 160 156,9 149,3 141,7 133,3 128,7 124,9
PN320 320 320 320 313,9 298,6 283,4 266,6 257,5 249,9
PN350 350 350 350 343,3 326,6 309,9 291,6 281,6 273,3
237

Working pressures and nominal pressures for materials in table have been calculated interpolation method.
Nominal pressure: 160 bar - ZWZ 11,
350 bar - ZWZ 12-1,
320 bar - ZWZ 12-2,
Diameter passage: 6 [mm]
Weight: 0,4 [kg] - ZWZ 11; 0,7 [kg] - ZWZ 12
Design and dimensions of the valve
Design options for the needle valve
Material for the
valve body
Carbon steel
Stainless steel
Valve type
(product code)
ZWZ 11-1
ZWZ 11-2
ZWZ 11-3
Type of connecting nozzles
Inlet
Outlet
with a ball ending and a nut
for a ball ending
with a ball ending and a nut
for welding
ZWZ 11-4 for welding for welding
ZWZ 11-5 with internal thread NPT 1/4” with internal thread NPT 1/4”
ZWZ 12-1 with internal thread G 1/2” with internal thread G 1/2”
ZWZ 12-2 with a ball ending and a nut with a ball ending and a nut
ZWZ 11-1-KO
with a ball ending and a nut
ZWZ 11-2-KO
for a ball ending
with a ball ending and a nut
ZWZ 11-3-KO
for welding
ZWZ 11-4-KO for welding for welding
ZWZ 11-5-KO with internal thread NPT 1/4” with internal thread NPT 1/4”
ZWZ 12-1-KO with internal thread G 1/2”” with internal thread G 1/2””
ZWZ 12-2-KO with a ball ending and a nut with a ball ending and a nut
ORDER PLACEMENT:
Orders must contain full name of the valve and its product code, e.g. needle valve ZWZ 11 - 1 - KO
238
Revision: ZWZ/06/2013
Valid until the next revision.