The blow-off valve is mounted on the flanged opening on the pipe of the blower outlet. The inlet
opening and valve seat are located in the bottom base (1). The main valve is formed by the
metal/rubber bellows (2), which is fixed to the top base (3). The top base is firmly connected to
the bottom base (1) by guide rods (4). Pressure is fed from the inlet opening to the control valve
(5) by the tube (6). The movable base (7) fixed to the bottom of the bellows (2), moves on guide
rods (4) and forms the main valve disc. The inner area of the bellows (2) is connected to the
control valve (5). When getting pressurized with process air, the movable base (7) seals off the
valve seat. The pressure in the bellows (2) is relieved by releasing the air in the control valve (5).
Valve function
The valve has two functions:
• Starting valve function:
while the blower is starting, the valve ensures gradual pressure and torque increase.
• Safety valve function:
while the blower is in operation, the valve protects the blower from overload (pressure
increase above the permissible limit).
Starting valve function:
In the state without pressure, the main valve is open.
Instruction book
14 AIF999999
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