Pilot valve system

Claim 2

A pilot valve system for controlling a first fluid pressure in response to predetermined high and low values of a second fluid pressure comprising: a bourdon tube fixed at and connectible with said second fluid pressure at a first end and free at a second end to move in response to changes in said second fluid pressure within said tube; a bleed valve connectible with said first fluid pressure to exhaust said pressure; bleed valve operator means connected between said second end of said bourdon tube and said bleed valve for opening said bleed valve responsive to one of both a high and a low value of said second fluid pressure, said operator means being functional at both of said pressure values for each of a plurality of adjustments of said values.

Claim 3

A pilot valve system for controlling a first fluid pressure in response to predetermined high and low values of a second fluid pressure comprising: a bourdon tube fixed at and connectible with said second fluid pressure at a first end and free at a second end to move in response to changes in said second fluid pressure within said tube; a bleed valve connectible with said first fluid pressure to exhaust said pressure; bleed valve operator means connected between said second end of said bourdon tube and said bleed valve for opening said bleed valve responsive to one of both a high and a low value of said second fluid pressure, said operator means being functional at both of said pressure values for each of a plurality of adjustments of said values.

Claim 4

A pilot valve system for controlling a first fluid pressure in response to predetermined high and low values of a second fluid pressure comprising: a bourdon tube fixed at and connectible with said second fluid pressure at a first end and free at a second end to move in response to changes in said second fluid pressure within said tube; a bleed valve connectible with said first fluid pressure to exhaust said pressure; bleed valve operator means connected between said second end of said bourdon tube and said bleed valve for opening said bleed valve responsive to one of both a high and a low value of said second fluid pressure, said operator means being functional at both of said pressure values for each of a plurality of adjustments of said values.

Claim 5

A pilot valve in accordance with claim 1 including pressure indicating means connected with said bourdon tube and pressure coupled with said bleed valve for operating said pressure indicating means in response to the opening of said bleed valve, said indicating means being adapted to releasably lock at the pressure value at which said bleed valve is opened for retaining an indication of such value on said indicating means until said pilot valve system is reset.

Claim 6

A pilot valve according to claim 1 wherein said valve operator mmeans includes a flapper lever pivotally connected at a first end with said second end of said bourdon tube, said lever being engageable at a second end with said bleed valve for opening and closing said bleed valve responsive to movement of said second end of said bourdon tube, and fixed spaced fulcrum points engageable by said lever for pivoting said lever to move said second end of said lever to operate said bleed valve when said second end of said bourdong tube is moved responsive to a change to one of both and a high low value of said second fluid pressure.

Claim 7

A pilot valve in accordance with claim 3 including indicating means for showing the pressure at which said bleed valve is activated, said indicating means being releasably lockable in response to the operation of said bleed valve to provide an indication of the pressure valve at which said bleed valve operated, said indication being retained by said indicating means until said pilot valve system is reset for a subsequent operational sequence.

Claim 8

A pilot valve in accordance with claim 3 wherein said lever is pivotally supported at said first end between two fulcrum points spaced along and positioned on opposite sides of said lever to cause the movement of the end of said lever in a single direction in response to movement of said second end of said bourdon tube in either of Two directions.

Claim 9

A pilot valve in accordance with claim 5 wherein said fulcrum points are positioned to effect movement of said second end of said flapper lever away from said bleed valve responsive to movement of said second end of said bourdon tube in either of said two directions.

Claim 10

A pilot valve in accordance with claim 6 wherein said bleed valve includes an operator pin engageable by said flapper lever when said lever is in a neutral position for holding said bleed valve closed and releaseable by said flapper lever when said lever moves in a direction of said valve for allowing said bleed valve to open.

Claim 11

A pilot valve in accordance with claim 3 wherein said indicating means includes a crank arm connected with said second end of said bourdon tube, a pointer connected with said crank arm, and a fluid actuated locking assembly operable with said pointer and with said bleed valve for locking said pointer at a position indicating a pressure range at which said pilot valve responded to said second fluid pressure.

Claim 12

A pilot valve for controlling a first fluid pressure in response to predetermined high and low values of a second fluid pressure comprising: a bourdon tube fixed at a first end and connectible at said end with said second fluid pressure; a second end of said bourdon tube being free to move in response to changes in the value of said second fluid pressure; bleed valve means adapted to be connected with said first fluid pressure for containing said pressure when closed and for exhausting said pressure to activate a fluid system communicated with said pressure when said bleed alve means is open; lever assembly means connected between said bourdon tube free end and said bleed valve means for opening said bleed valve means responsive to movement of said free end of said bourdon tube in both of two directions for opening said bleed valve means when said second fluid pressure in said bourdon tube reaches one of high and a low predetermined value; and indicator means connected with said free end of said bourdon tube and said bleed valve to provide a showing of the pressure at which said bleed valve opened and to lock said indicator means at said opening pressure until said pilot valve is reset.

Claim 13

A pilot valve for controlling a first fluid pressure in response to predetermined high and low values of a second fluid pressure comprising: a bourdon tube fixed at a first end and connectible at said end with said second fluid pressure; a second end of said bourdon tube being free to move in response to changes in the value of said second fluid pressure; bleed valve means adapted to be connected with said first fluid pressure for containing said pressure when closed and for exhausting said pressure to activate a fluid system communicated with said pressure when said bleed alve means is open; lever assembly means connected between said bourdon tube free end and said bleed valve means for opening said bleed valve means responsive to movement of said free end of said bourdon tube in both of two directions for opening said bleed valve means when said second fluid pressure in said bourdon tube reaches one of high and a low predetermined value; and indicator means connected with said free end of said bourdon tube and said bleed valve to provide a showing of the pressure at which said bleed valve opened and to lock said indicator means at said opening pressure until said pilot valve is reset.

Claim 14

A pilot valve in accordance with claim 9 wherein said bleed valve is provided with means for indicating when said valve has been opened, said means operating independently of said indicator means.

Claim 15

A pilot valve system for controling a first fluid pressure in response to either of predetermined high or low values of a second fluid pressure comprising: a bourdon tube fixed at a first end and free to move at a second end; means connected with said first end of said bourdon tube for communicating said tube with said second fluid pressure; a bleed valve adapted to be communicated with said first fluid pressure for containing such pressure when said bleed valve is closed and for exhausting said pressure when said bleed valve is open, said bleed valve having an operator pin connected with a valve element, said operator pin being adapted to be held at a first position for holding said bleed valve closed and to be released for a movement to a second position at which said bleed valve is open; a flapper lever pivotally secured at a first end with said second end of said bourdon tube and adapted at a second end to engage said operator pin of said bleed valve to hold said bleed valve closed when said lever is at a neutral position; a spring engageable with said second end of said lever biasing said second end toward said bleed valve operator pin to hold said pin at a position to keep said valve closed; a first adjustable fulcrum point supported for engagement with said first end of said flapper lever on a side of said lever to pivot to move said second end of said lever away from said bleed valve operator pin when said free end of said bourdon tube moves in a direction away from said lever responsive to a predetermined high pressure in said tube; a second adjustable fulCrum point spaced from said first fulcrum point on the opposite side of said lever and engageable with said lever when said free end of said bourdon tube moves toward said lever responsive to a predetermined low pressure in said bourdon tube to move said second end of said flapper lever away from said valve operator pin; a crank pivotally secured at a first end with said second end of said bourdon tube and mounted for rotation responsive to movement of said end of said bourdon tube; a moveable indicator connected with a second end of said crank for arcuate movement responsive to rotation of said crank by said free end of said bourdon tube to provide a visual showing of the pressure within said bourdon tube causing movement of said free end of said bourdon tube whereby an indication is provided of the pressure at which said bleed valve is opened by said bourdon tube; and locking means pressure connected with said bleed valve and operatively associated with said indicator for locking said indicator at a position to show the pressure at which said bleed blave opened.

Claim 16

A pilot valve system for controling a first fluid pressure in response to either of predetermined high or low values of a second fluid pressure comprising: a bourdon tube fixed at a first end and free to move at a second end; means connected with said first end of said bourdon tube for communicating said tube with said second fluid pressure; a bleed valve adapted to be communicated with said first fluid pressure for containing such pressure when said bleed valve is closed and for exhausting said pressure when said bleed valve is open, said bleed valve having an operator pin connected with a valve element, said operator pin being adapted to be held at a first position for holding said bleed valve closed and to be released for a movement to a second position at which said bleed valve is open; a flapper lever pivotally secured at a first end with said second end of said bourdon tube and adapted at a second end to engage said operator pin of said bleed valve to hold said bleed valve closed when said lever is at a neutral position; a spring engageable with said second end of said lever biasing said second end toward said bleed valve operator pin to hold said pin at a position to keep said valve closed; a first adjustable fulcrum point supported for engagement with said first end of said flapper lever on a side of said lever to pivot to move said second end of said lever away from said bleed valve operator pin when said free end of said bourdon tube moves in a direction away from said lever responsive to a predetermined high pressure in said tube; a second adjustable fulCrum point spaced from said first fulcrum point on the opposite side of said lever and engageable with said lever when said free end of said bourdon tube moves toward said lever responsive to a predetermined low pressure in said bourdon tube to move said second end of said flapper lever away from said valve operator pin; a crank pivotally secured at a first end with said second end of said bourdon tube and mounted for rotation responsive to movement of said end of said bourdon tube; a moveable indicator connected with a second end of said crank for arcuate movement responsive to rotation of said crank by said free end of said bourdon tube to provide a visual showing of the pressure within said bourdon tube causing movement of said free end of said bourdon tube whereby an indication is provided of the pressure at which said bleed valve is opened by said bourdon tube; and locking means pressure connected with said bleed valve and operatively associated with said indicator for locking said indicator at a position to show the pressure at which said bleed blave opened.