Nederman TAV 50, Руководство пользователя

Страница: 20 / 147

Vacuum Valve TAV 50
EN
• TAV 50 FV/MV ( Figure 13 ) features two control
devices, a flow sensing valve, and a solenoid valve. It
can be controlled by an electric signal as well as by a
compressed airflow.
6 Using Vacuum Valve TAV 50
WARNING! Risk of personal injury
• Keep fingers clear off the vacuum connec-
tions when the valve is connected to com-
pressed air. The spring that closes the valve
is strong enough to cause discomfort.
• Make sure the system does not transport ma-
terial which can damage the TAV valve.
• If an unexpected object comes into the sys-
tem, shut the compressed air supply to the
valve immediately and remove the object.
7 Maintenance
Installation, repair and maintenance work is to be car-
ried out by qualified personnel using only the original
Nederman spare parts. Contact your nearest author-
ized distributor or Nederman for advice on technical
service.
WARNING! Risk of personal injury
• Disconnect voltage prior to service.
• The compressed air supply must be discon-
nected and any remaining pressure in the
valve discharged before commencing any
maintenance work to the valve. A shut-off
valve before each TAV 50 valve is recommen-
ded.
• The compressed air supply to the TAV 50 valve must
be dry and clean (according to standard ISO 8573-1
class 5). Dirt may result in malfunction by clogging
the control device or the air cylinder inlet. Installing
an air filter may be necessary if clogging occurs.
• Make sure the inside of the valve and the connec-
tion pipes are free from deposits. A build-up of de-
posits inside the piping system may cause a dis-
charge of static electricity.
• Make sure the outside of the TAV valve, and particu-
larly the solenoid, are free from dust layers.
• Oily and sticky substances can sometimes stick to
the valve blade resulting in jamming so that the
valve does not close completely. The valve must
then be dismantled for cleaning.
• The backup rings of chloroprene are resistant to
most substances in reasonable quantities. Oil in a
large quantity can cause swelling to the rings result-
ing in jamming.
• After a million operations, the nylon sealing rings
should be exchanged in order to avoid leakage.
• The piston sealing ring needs changing if internal
leakage occurs in the air cylinder. A small quantity of
a silicon-free pneumatic grease, for example, Microl-
ube GL 261, should be applied to the new ring be-
fore assembly.
• The flow sensing valve (FV) is detailed in
Chapter 8 Flow Sensing Valve .
To ensure the required level of protection with re-
gards to the equipment category, specifically in ATEX
classified zones, check the following points regu-
larely, at least once a year:
• Inspect the TAV 50 parts described in
Figure 1 for
damage or malfunction. If the TAV 50 is damaged it
must removed immediately from the classified area,
while it is being repaired or replaced.
• Ensure that no explosive atmosphere and/or dust
layers are present when cleaning, servicing or in-
specting the TAV.
• Ensure that only original (OEM) spare parts are used.
• Ensure that the TAV 50 is not covered with thick
dust layers (>5 mm). This is prevented by setting up
routines for regular cleaning and including these in
the explosion protection document.
8 Flow Sensing Valve
The Flow Sensing Valve comes with TAV 50 FV and
TAV 50 FV/MV by delivery.
8.1 Technical data
Maximum pressure 1 MPa (10 bar)
Minimum pressure (for
safe operation) 0.5 MPa (5 bar)
Recommended pressure 0.6–0.7 MPa (6–7 bar)
Maximum airflow (flow
valve) 1800 Nl/min
Minimum airflow (flow
valve) 100 Nl/min
8.2 Description
The flow sensing valve senses the flow of compressed
air through the valve and gives an air signal at the out-
put nipple. The valve is normally used for controlling
TAV 50 but can also be used whenever an airflow
should control a process. It is fitted with nipples for 13
mm (1/2”) hose. The pressure drop across the valve is
normally small enough to be neglected.
8.3 Main components
Figure 16 shows a partly disassembled valve.
1 Housing with fitted angle output nipple
2 Piston
3 Spring
4 Bottom lid
20