Technical details subject to change without notice
AKO Armaturen & Separationstechnik GmbH
D-65468 Trebur-Astheim ▪ Adam-Opel-Str. 5 ▪ Telefon: +49 (0) 61 47-9159-0 ▪ Fax: +49 (0) 61 47-9159-59
E-Mail: [email protected] ▪ Internet:
Operating instructions BA_mV_VZ_EN_2015-07-09
Important Information:
Please ensure you read these operating instructions
before each installation.
Faulty installation or incorrect commissioning can
lead to damage in the plant or equipment and to
personal injuries. The firm AKO does not give any
guarantee for damage resulting from improper handling
or due to the use of third party parts. Our VZ valves
are designed as defined by the Pressure Devices
Directive (EC Directive RL97/23/EC) for Group II fluids.
Valves for use with Group I fluids can be produced on
request. AKO does not accept any responsibility for
the resistance of the valve materials.
Storage:
Please store pinch valves dry, protected of sunlight,
wetness and any agressive enviromental.
Structure:
AKO’s VZ pinch valve essentially comprises three
principal components:
valve housing
•
(two-part - upper and lower casing halves)
sleeve
•
(elastomer hose in contact with the medium)
actuation (handwheel or electric drive)
•
The valve is designed so that all the moving compo
-
nents (apart from the actuation) are located inside the
pinch valve.
The lower case half incorporates a bore with a vent
plug. The medium being delivered would escape here
or at the actuator should the sleeve begin to leak as a
result of a fault. This bore can optionally be fitted with
a leak monitor which requires that the pinch valve is
mounted such that the bore is located at the lowest
point.
The AKO pinch valve is, thanks to its innovative tech
-
nology, an extremely low maintenance and hence
low-cost valve.
The functional principle of a mechanical Pinch
Valve:
Operating the actuator causes a mechanical system
to drive two pinch bars which compress a flexible elas
-
tomer hose (sleeve) and thus close the pinch valve.
This creates a lip-shaped closing pattern. When the
actuator is run in the opposite direction, the sleeve
opens to create a free passage. This process is
supported by opening tabs which connect the
sleeve with the pinch bars. The opening and closing
motions of the sleeve reduce the build-up of medium
sediment on the sleeve wall. Solids (up to a certain
size) in the medium are enclosed by the sleeve as it
closes - thereby ensuring the tightness of the closed
valve. However, the sleeve will no longer close tight if
there is a large volume of coarse solids.
Technical operating data:
DN 80 = max. 6,0 bar operating pressure
The AKO pinch valve is supplied with a flange
connection complying with DIN PN10/16 and/or ANSI
150.
Further technical data may be found in the data
sheet.
Selection of the materials for the individual valve
parts:
The selection of the correct materials depends on
a number of factors, such as: medium properties
(pressure, temperature etc.), ambient criteria
(temperature, weather etc.) and customer/application
specifications. We would be pleased to advise you in
the selection of the correct sleeve.
The sleeve is the only component that comes into
contact with the medium being delivered and simulta
-
neously acts as the flange gasket.
Please ensure adequate UV protection when storing
sleeves. UV radiation leads to premature aging of the
sleeve and all types of plastic parts.
Controlling:
The following actuators are possible:
Handwheel (the valve is opened or closed by means
•
of physical rotating force at the handwheel)
Electric rotary drive (the valve is opened or closed
•
by means of an actuating or regulating drive)
Where actuating components manufactured by third
parties are used, their regulations and instructions
must be observed.
1
Operating Instructions for AKO
Manual Pinch Valves of VZ series
