16
The recommended setting for the pressure relief valve is 10% greater than the operating gauge pressure of
the blower, but not less than 1 PSIG (7 kPa) above the operating gauge pressure of the blower. The valve
is set to the proper pressure at the factory, however changes can occur during shipment so it is important
that the valve be tested at initial start-up. Setting adjustments may also be necessary when you move your
Qube, or if there is a change in process parameters.
If you need to adjust the pressure relief valve setting, follow the procedure shown below:
1. Turn off and lock out power to your Qube.
2. Avoid overtightening of valve during installation.
3. Vacuum setting may be varied or - 10% of original setting by removing hood and running
pressure screw in or out as desired.
NOTE
Retighten locknut after each adjustment
4. Valve may be cleaned by removing disc and cleaning seat surface with a soft cloth. Seating surface
may be lapped in case of leakage by using a fine grit compound.
5. Install Qube enclosure panels and secure the 1/4-turn fasteners.
6. Unlock the power and start your Qube.
NOTE
As with all standard manufactured discharge silencers supplied with rotary
positive displacement blowers, the discharge silencer included with your
Qube is of a design that is not ASME code stamped. Local jurisdictions
may require any pressure vessel that can experience pressure greater
than 14.9 PSIG (1027 mbar g) to be ASME code stamped. Consult your
insurance carrier if operation above 14.9 PSIG (1027 mbar g) is required.
Please note, this does not apply to Qube 400 as it has an integral silencer.
5.4 ACCESSORIES
(In addition to the following, other accessories are available, please consult factory).
5.4.1 NOISE CONTROL ENCLOSURE
Qube includes a fabricated and insulated sheet steel noise control enclosure designed for the reduction of
noise that emanates from the blower and the electric motor.
5.4.2 INTEGRAL SILENCER/BASE
Tuthill has incorporated the discharge silencer into the base to reduce the package size. It also enhances
the structural integrity of the base. It has a reactive type silencer that utilizes multiple passes and paths to
create sound losses through out-of-phase cancellation of sound waves. NOTE: This applies to Qube 800 &
1600 Only as Qube 400 has an integral blower silencer.
5.4.3 COOLING FAN
Each Qube system is supplied with an axial flow fan driven on the blower shaft, to exhaust heat from the
enclosure.
