Mod-U-Blast MBM Series - How MBM-Series Systems Work (Combo Valve); Adding Abrasive; System Pressurization; System Depressurization

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MBM-Series Owner’s Manual

How MBM-Series Systems Work Pressure Release with Combo Valve

Warning: This section of the manual is designed to give you a general understanding of how the

Abrasive Blaster functions. ALL sections of this manual must be read and understood before operat-

ing the equipment.

ADDING ABRASIVE

Abrasive is added through the hole in the top of the blaster

where the pop-up and seal are located. It ows down through

the hole, around the pop-up, and down the bottom of the

pressure vessel where it exits through the metering valve.

PRESSURIZATION

When a compressed air source (such as an air-compressor)

is connected to the inlet of the Abrasive blaster and the inlet

valve is opened, compressed air ows through the moisture

separator (if equipped) and reaches the Combination Valve

where it is stopped. When the control handle is activated, the

Combination valve pinches the Blow-down Hose and air ows

through into the pressure vessel causing the Pop-Up (located

internally) to seal against its seat. The pressure vessel is now

sealed and pressurized. Air will continue past the choke valve

to the metering valve where it is mixed with abrasive . The

mixture of compressed air will now exit the Abrasive Blaster

through a blast hose and nozzle connected to the coupling on

the metering valve and blasting begins.

DEPRESSURIZATION (Blow - Down)

When the control handle is released in a pressure release

system, (MBM Blast Pots with combo valves) the combination

valve automatically closes stopping the ow of compressed

air and releasing the Blow-down Hose. The compressed air

remaining in the pressure vessel is released through the Blow-

down Hose and blasting ends.

Loaded Abrasive

Compressed

Air Inlet

Exhausted

Air