Apparatus with latching effect for limiting pressure in liquid f

Details Apparatus with latching effect for limiting pressure in liquid f Apparatus with latching effect for limiting pressure in liquid f

1981-08-12

1984-03-06

Look, Edward K.

Pumps

Condition responsive control of pump drive motor

With condition responsive control of pump fluid valve

417307, 417316, F04B 4908

Patent

active

044351275

ABSTRACT:
An apparatus having latching effect for limiting pressure in liquid feeding systems has a valve means inserted in the feeding path of a pump supplied liquid. The valve means includes a shunt valve opened upon excessive output pressure; the shunt output of the shunt valve is connected to a feed-back tube. There is further provided a back-stroke valve in the main feeding path of the liquid. A first pressure switch has the output pressure applied thereto while to a second pressure switch the input pressure at the shunt valve is applied. The two pressure switches are inserted into the switch-on circuit of the pump in such a manner that the pump is switched-on in the presence of a low output pressure and switched-off in the presence of an excessive output pressure.

REFERENCES:
patent: 3014687 (1961-12-01), Keisling et al.
patent: 3119551 (1964-01-01), Beeman
patent: 3446238 (1969-05-01), Norstrud et al.
patent: 3827827 (1974-08-01), Hill
patent: 4124332 (1978-11-01), Nishijyo

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