Control arrangement for a shutoff valve actuatable by negative p

Details Control arrangement for a shutoff valve actuatable by negative p Control arrangement for a shutoff valve actuatable by negative p

1994-12-16

1997-06-03

Lee, Kevin

Fluid handling

Systems

Programmer or timer

137205, 137907, E03B 707, E03F 100

Patent

active

056344945

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.

REFERENCES:
patent: 3538517 (1970-11-01), Cornish et al.
patent: 4373838 (1983-02-01), Foreman et al.

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