Abstract: A blasting system having a pressure control circuit that automatically sets and balances pressures in the system to provide a more efficient blasting process. The pressure control circuits provide the ability and enable an operator to more easily and efficiently set the operating pressures of a wet abrasive blasting system, for example, for various blasting processes and easily obtain a consistent blast stream flow. Embodiments of the invention provide an accurate, simple, and intuitive control of the pressure supply system. In specific embodiments, the pressure control circuit controls both the supply pressure to an air driven water pump and the pressurized air supply to slurry mixer by setting only one of these pressures. In certain other embodiments of the pressure control circuit, both pressures may be set through operation of a single, multi-port selector valve.

Abstract: A dual control shut off system, such as a dead man system for a blasting system, blasting equipment, or other equipment having both pneumatic and electric safety control circuits, may include an electric dead man's switch or a pneumatic dead man's switch. An embodiment of the dual control dead man system is for wet abrasive blasting systems used for cleaning, preparing surfaces, removing coatings, and/or other abrasive blasting operations. Embodiments of the dual control shut off system provide the ability to conveniently switch between an electric and pneumatic shut off system.

Abstract: Wet abrasive systems typically have a combination of equipment, controls, and piping systems that allow various fluid flows to be controlled in order to provide the various operations. A fluid control circuit is used to provide fluid to the correct locations for each operation. A fluid control circuit has a multiport selector valve. The selector valve allows selective fluid communication between the fluid inlet and either a first fluid outlet or a second fluid outlet. A first piping system is in fluid communication with the first fluid outlet and a second piping system is in fluid communication with the second fluid outlet. The fluid control circuit may also have jumper piping system between the first piping system and the second piping system. The combination of a multiport selector and the piping systems provide a convenient blast system to operate.