Control arrangement for a shutoff valve actuatable by negative pressure
AssigneeRoediger Anlagenbau-GmbH
InventorPeter Martens
Life of this patent
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Abstract
The invention relates to a control arrangement (10) for a shutoff valve, actuated by application of negative pressure, for use in a negative pressure wastewater system. The control arrangement includes a chamber (28) in which a main piston (22) is displaced as a function of negative pressure and a driver by way of which valves (70, 72) are actuated so as to operate independently of each other; the valves (70, 72) transmit or inhibit negative pressure to open or close a wastewater aspiration valve and a ventilation valve.
Claims20
For use in a negative pressure wastewater system, a control arrangement (10) for a shutoff valve (11) actuated by negative pressure, said control arrangement comprising:
- a first valve (14) that is actuated by static pressure resulting from accumulated wastewater and that opens a normally closed connection (38) transmitting negative pressure, a chamber (28) which is evacuated as negative pressure is transmitted through said connection when the first valve (14) is actuated and in which a main piston (22) is acted upon by a spring (24), said main piston is displaceably disposed, as a function of the pressure prevailing in the chamber (28), at least a second valve (70) which is positively coupled to the main piston (22) and which controls a negative pressure connection (76) to said shutoff valve (11), and
- the control arrangement (10) further incudes a third valve (72), which is positively coupled to the main piston (22) and which controls a further negative pressure connection (78) to a ventilation valve (13) for its operation that delivers air into the negative pressure wastewater system.
For a vacuum type wastewater system, where wastewater is aspirated by negative pressure, a control arrangement (10) to control the flow of wastewater through a shutoff valve (11) which opens upon application of negative pressure thereto,
- said control arrangement comprising:
- a first valve (14) actuated by static pressure resulting from accumulated wastewater,
- a main chamber (28) in which negative pressure is transmitted via a connection (38) upon the first valve (14) being actuated,
- a main piston (22) biased by a spring (24) towards a first position and displaced towards a second position by the negative pressure prevailing in the main chamber (28),
- a driver (64, connected to said main piston (22)
- a second valve (70) transmitting negative pressure to the shutoff valve (11) so as to enable wastewater aspiration, and
- a third valve (72) independent from the main piston but operable by the driver (64) for opening a further negative pressure connection (78) to a ventilating valve (13) which is opened by negative pressure and delivers air into the vacuum type wastewater system.
Dependencies are inferred from the claim text.