Technical Data; Description; Main Components; Function - Nederman TAV 50 Manual De Instrucciones

8.1

Technical data

Table 8-1: Technical data
Maximum pressure
Minimum pressure (for safe operation)
Recommended pressure
Maximum air flow (flow valve)
Minimum air flow (flow valve)
8.2

Description

The flow sensing valve senses the flow of compressed air through the valve and gives an air
signal at the output nipple. The valve is normally used for controlling TAV 50 but can also be
used whenever an air flow 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
5. Locking ring
8.4

Function

Figure 17a shows the valve in the open position with air flowing through it. The flow presses
the piston downwards and air can pass to the output nipple as indicated by small arrows. In
the closed position, figure 17b, the spring presses the piston upwards causing its o-ring to seal
against the seat. Discharge of signal air takes place from the output nipple to atmosphere via the
discharge port (not visible in figure). A 2 mm bypass hole in the piston accepts a small leakage
flow without opening the valve.
8.5

Connection

Normal connection is shown in figure 12. Connections, other than to TAV 50, are made in a
similar way. Make sure hose clips are tightened correctly.
8.6

Maintenance

WARNING! Risk of personal injury.
Do not open the flow sensing valve without first shutting off the compressed air and discharging
any remaining pressure.
The valve needs no preventive maintenance if the compressed air supply is clean. Dirt can cause
the valve not to close. It must then be dismantled for cleaning. To do this, use a special pair of
pliers suitable for the locking ring under the lid. Before reassembling check that the o-ring lies
correctly on the lid. Air leakage downstream the valve could be another reason for the valve not
closing.
1 MPa (10 bar)
0.5 MPa (5 bar)
0.6–0.7 MPa (6–7 bar)
1800 Nl/min.
100 Nl/min.
Vacuum Valve TAV 50 EN
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