A vacuum cleaning machine has a cannister with an inlet port and at least two outlet ports. At least two filters are disposed inside of the cannister, one in pneumatic communication through each of the outlet ports. At least two valves are disposed outside of the cannister. Each valve is in pneumatic communication between a vacuum source and an outlet port so as to permit air to be drawn by the vacuum source from the inlet port simultaneously through the filters. A controller operates the valves to switch the filters from the vacuum source to ambient air so as to permit ambient air to be sequentially intermittently drawn through corresponding valves and filters into the cannister. Preferably, the controller includes a timing mechanism for setting the delay time of the sequential valve operation and a timing mechanism for setting the intermittent time of connection of each filter to ambient air.

An in-line flow control component includes a body having an inlet and an outlet that are substantially coaxial with a tube extending through the body. The tube forms a flow path between the inlet and the outlet, and one end of the tube sealingly engages a valve seat for controlling fluid flow between the inlet and outlet. First and second diaphragms each have an opening sealingly secured about an outer periphery of the tube and an outer peripheral portion sealed to the body. The diaphragms selectively move the tube between open and closed positions in response to force acting on the diaphragms. The force is provided by either a mechanical mechanism (toggle, wedge member, threaded adjustment knob, etc.) or fluid pressure introduced between the diaphragms. The diaphragms may be similarly or differently dimensioned. Plural flow control components may be assembled in end-to-end sealed relationship.

Systems, methods, and apparatuses for a valve assembly are provided. The valve assembly includes an upper sleeve, a lower sleeve, and a poppet. The lower sleeve is coupled to the upper sleeve. The lower sleeve includes a bottom face, a side, a supply port, and a pilot port. The supply port extends through the side of the lower sleeve. The pilot port extends through the bottom face of the lower sleeve. The poppet is operable between a first position and a second position. The poppet is contained between the upper sleeve and the lower sleeve. The poppet includes a first end, a second end, a side, a central cavity, and a hydraulic port. The second end is spaced from the first end, the side is adjacent one of the first end and the second end. The central cavity extends from the first end of the poppet towards the second end of the poppet. The hydraulic port extends from the side of the poppet into the central cavity. The hydraulic port is configured to receive hydraulic fluid at a first flow rate from the supply port and to supply hydraulic fluid to the central cavity at a second flow rate less than the first flow rate.

A vacuum cleaning machine has a cannister with an inlet port and at least two outlet ports. At least two filters are disposed inside of the cannister, one in pneumatic communication through each of the outlet ports. At least two valves are disposed outside of the cannister. Each valve is in pneumatic communication between a vacuum source and an outlet port so as to permit air to be drawn by the vacuum source from the inlet port simultaneously through the filters. A controller operates the valves to switch the filters from the vacuum source to ambient air so as to permit ambient air to be sequentially intermittently drawn through corresponding valves and filters into the cannister. Preferably, the controller includes a timing mechanism for setting the delay time of the sequential valve operation and a timing mechanism for setting the intermittent time of connection of each filter to ambient air.