Fluid flow switch assembly

Details Fluid flow switch assembly Fluid flow switch assembly

H - Electricity

01

H

H01H 35/38 (2006.01) H01H 35/40 (2006.01)

Patent

CA 2137808

The flow switch assembly (10) of a fluid power apparatus comprises a fluid flow pressure operated switch (10) which acti- vates upon the failure or degradation of fluid flow. A body (14) contains therein a blind bore (15) which receives a piston (71) bi- ased by a spring (17) located at the bottom (13) of the bore (15). A switch housing (11) which is molded about a contact (20) is threadedly inserted into an open threaded end (16) of the bore (15). The bore (15) communicates with a fluid flow opening such that fluid pressure causes the piston (71) to retract against the spring (17). The contact (20) extends axially beyond a wall (11A) of the switch housing (11) such that a radially enlarged portion (21) provides a seat for a seal (30) which sealingly engages the radi- ally enlarged portion (21) and a surface of the bore (15). If fluid flow should cease or fall below a predetermined pressure level, the piston (71) is displaced by the spring (17) and engages the contact (20) to complete a circuit and energize an electric motor pump which provides fluid pressure to the associated fluid power apparatus.

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