AZ Pneumatik 08.156.4 operating instructions

TWO-HAND SAFETY VALVE

code 08.156.4

operating instructions

This valve is used to pilot high-flow directional control valves connected to machines which have a high risk of injuries to the hands.
The machine operator must simultaneously operate, in a safe area, two three-way manual valves for correct operation. The safety valve will ignore a single
depression of one of the manual valves. To repeat the cycle both pilot signals must be exhausted and the manual valves simultaneously actuated again.

VALVE INSTALLATION AND CONNECTION

- Connect a 3/2 NC valve to the Two-hand safety valve at the ports numbered with "1". The port numbers are marked on the bottom of the Two-hand safety
valve near the corresponding threaded ports. With these 3/2 valves the operator gives to the Two-hand safety valve two simultaneous signals.

- Connect to the port numbered with "2" the high-flow device which should be operated by the Two-hand safety valve.

- A silencer or an exhaust collecting device can be connected to port "3".

- Mount the Two-hand safety valve using the two fixing holes. The air hoses must not be bent or constricted, and the normal air flow must not be obstructed.

VALVE OPERATION

- Respect the minimum operating pressure (2 bar). The Two-hand safety valve will not operate at lower pressures.

- Find, with reference to the graphic "reaction time related to pressure", printed on the back of this page, the ∆t (delay between the two pilot signals) within
which the Two-hand safety valve will operate. If the supply pressure increases the ∆t decreases.

- Manually and simultaneously operate both 3/2 NC valves. The Two-hand safety valve receives both pilot signals and, if the delay ∆t is respected, operates
the high-flow device to which it is connected.

WARNING

- In case of anomalous operation please refer to the manufacturer. Do not try to repair the Two-hand safety valve by yourself. The label will break if the valve
is disassembled. In case of broken label the guarantee immediately expires.

- The Two-hand safety valve does not allow to repeat the operation without exhausting both 3/2 NC valves connected to it. It is impossible to block one of
them in the actuated position to operate only the other one. To repeat the operation, both pilot signals must be exhausted and the manual valves
simultaneously actuated again.

- Fluids carrying particles of solvent or fluids not compatible with NBR are not allowed to operate with the Two-hand safety valve.

TECHNICAL DATA

Delay between two actuating signals: ∆t<0.5 s
Working pressure range: 2 bar ... 8 bar

Temperature range: max +60°C
Maximum flow rate: 100 Nl/min
Fluid: 50µ filtered, lubricated or non lubricated air

Materials

Body: aluminium 11S
Springs: stainless steel
Seals: NBR
Internal parts: brass OT58

application sketch

logic symbol

CE APPROVAL DECLARATION

The manufacturer

AZ PNEUMATICA s.r.l.
Via Kennedy, 26
I-20020 MISINTO
ITALY

Tel. [phone]
Fax [phone]

http://www.azpneumatica.com
e-mail: [e-mail]

declares, under his own responsibility, that the device TWO-HAND SAFETY VALVE, code

08.156.4, complies to the Machinery Directives EEC 89/392, 91/368, 93/44, 96/68 and to
Norm EN 574, level 1. For this device we have got the CE-certification

nr. MAC 249 AT 312

on 06.04.98 from ANCCP s.r.l., company entitled by the Italian Industry Ministry and the EEC
with number 0302.