Differential pressure responsive device

Claim 2

In a differential pressure responsive device two housings on opposed sides of a center plate and having pressure chambers therein open communication with each other through an opening in the center plate, bellows mounted in the respective chambers and enclosing a liquid, said bellows having movable end portions, valve means connecting the movable end portions together through said opening, said valve means including portions slidably telescoped with each other, means for locking said portions in secure connectioN, a ring sleeved over the telescoped portions and having the locking means carried thereby, and output means including means rotatably mounted transversely through the center plate said output means transmitting motion of the valve means to the outside of the housing and said output rotatable means connected to means having a follower bearing against a side of the ring and operated by movement of the telescoped portions.

Claim 3

In a differential pressure responsive device according to claim 1, including spring means connected with said motion transmitting output means and acting thereon to move the movable ends of the bellows in one direction.

Claim 4

In a differential pressure responsive device two housings on opposed sides of a center plate and, having pressure chambers therein in open communication with each other through an opening in the center plate, bellows mounted in the respective chambers and enclosing a liquid, said bellows having movable end portions, valve means including rod means connecting the movable end portions together, means connected with the valve means for transmitting motion of the valve means to the outside of the housings, the motion transmitting means including a shaft mounted transversely in the housing for rotary movement and extending through said plate, means operatively connecting said shaft with the valve means for turning the shaft upon axial movement of the valve means, a transmitting shaft connected to said valve rod means and to said first mentioned shaft to rotate therewith, and a range spring connected with the opposite end of the first mentioned shaft to control rotary movement of the shafts.

Claim 5

In a differential pressure responsive device two housings on opposed sides of a center plate and, having pressure chambers therein in open communication with each other through an opening in the center plate, bellows mounted in the respective chambers and enclosing a liquid, said bellows having movable end portions, valve means including rod means connecting the movable end portions together, means connected with the valve means for transmitting motion of the valve means to the outside of the housings, the motion transmitting means including a shaft mounted transversely in the housing for rotary movement and extending through said plate, means operatively connecting said shaft with the valve means for turning the shaft upon axial movement of the valve means, a transmitting shaft connected to said valve rod means and to said first mentioned shaft to rotate therewith, and a range spring connected with the opposite end of the first mentioned shaft to control rotary movement of the shafts.

Claim 6

In a differential pressure responsive device according to claim 3 wherein the motion transmitting means includes a shaft mounted in the housing and having a projecting end portion, a range spring sleeved over said projecting end portion and having one end thereof fixed to the shaft and the opposite end fixed to the housing for controlling the rotary motion of the shaft.

Claim 7

In a differential pressure responsive device, according to claim 6, each of the bellows having corrugated peripheral portions with walls of the corrugations disposed transversely of the axes of the bellows and movable laterally in directions axially of the bellows in response to variations in temperature.

Claim 8

In a differential pressure responsive device, two housings on opposed sides of a center plate and having pressure chambers therein in open communication with each other through an opening in the center plate bellows mounted in the respective chambers and enclosing a liquid, said bellows having movable end portions, valve means including rod means connecting the movable end portions together, means connected with the valve means for transmitting motion of the valve means to the outside of housings, the motion transmitting means connected to a shaft rotatably mounted transversely in the housing and extending through the center plate, said shaft having a projecting end portion externally of the housings, a disc sleeved over the shaft end portion, means detachably connecting the disc with the housing for separation and removal therefrom, and a coiled spring sleeved over the shaft end portion and having one end anchored to the shaft and the other end anchored to the disc, said disc and spring being removable from the shaft for replacement of the spring.

Claim 9

In a differential pressure responsive device, two housings on opposed sides of a center plate and having pressure chambers therein in open communication with each other through an opening in the center plate bellows mounted in the respective chambers and enclosing a liquid, said bellows having movable end portions, valve means including rod means connecting the movable end portions together, means connected with the valve means for transmitting motion of the valve means to the outside of housings, the motion transmitting means connected to a shaft rotatably mounted transversely in the housing and extending through the center plate, said shaft having a projecting end portion externally of the housings, a disc sleeved over the shaft end portion, means detachably connecting the disc with the housing for separation and removal therefrom, and a coiled spring sleeved over the shaft end portion and having one end anchored to the shaft and the other end anchored to the disc, said disc and spring being removable from the shaft for replacement of the spring.

Claim 10

In a differential pressure responsive device according to claim 6, said spring and disc being slidably removable from the end portion of the shaft for replacement, and a cap detachably mounted on the housing over the projecting end portion of the shaft.