Pressure Operable Control Device (Patent No: 652518)

Inventor: Barber Machinery Limited

Location: Edmonton

Comments: N/A

Description:
The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A pressure operable control device for controlling fluid flow comprising a closed housing having a top closure cap and a bottom wall, a tubular body member secured to said bottom wall, a piston reciprocally mounted in said body member and having one end portion projecting through said bottom wall into said housing, a spring on said piston in said body member and urging said piston in a direction outwardly of said housing, a shoulder fixed to said piston end portion within said housing, said housing having a seat engageable by said shoulder to define the limit of spring responsive movement of said piston outwardly of said housing, a switch in said housing and having an actuating button overhanging said shoulder, said button being in freely spaced relation to said shoulder when said shoulder is in engagement with said seat and being engageable by said shoulder to actuate said switch in response to movement of said piston in a direction inwardly of said housing, means adjustably mounting said switch to vary the distance of said button from said shoulder when in seated position, a piston guide in said body member in fixed sealing relation to the inner surface thereof, said piston extending through said guide, a diaphragm seated on said guide in said body member and engaging the other end of said piston, said diaphragm being in distended condition in response to engagement by said piston when said shoulder is in seated position, said body member having an open end and an internal annular flange adjacent said open end, a second diaphragm seated on said annular flange in spaced relation to said first diaphragm, a spacer ring inside body member engaging said two diaphragms and holding said diaphragms in seated engagement with said guide and annular flange, the space between said diaphragms forming a damping chamber therebetween, a liquid filling said damping chamber, said second diaphragm having an exposed face for engagement by fluid under control, said diaphragms being responsive to fluid pressure to reciprocate said piston in a direction against the action of said spring.


2. A pressure operable control device as defined in claim 1, said shoulder being screw-threadedly mounted on said piston for adjustment in an axial direction thereof, and means for locking said shoulder in any adjusted position.


3. A pressure operable control device as defined in claim 1, said switch having a reset button, and switch reset means comprising an arm fixed to said piston and overhanging said reset button, said arm being in engagement with said button when said shoulder is in seated position.