Abstract: A self-contained valve positioner having a single valve positioner housing including an actuator portion and having a pneumatically operated actuator unit therein carrying a main valve member to position the main valve member relative to a main valve seat in a valve unit in relation to the magnitude of a single pneumatic signal directed to the valve positioner and being utilized as the fluid source therein for pneumatically operating the actuator unit, the actuator unit having structure in the housing to cause the actuator unit to progressively open the valve member as the signal being directed to the valve positioner progressively increases from a first value to a second value and thereafter to progressively close the valve member as the signal being directed to the valve positioner progressively increases from the second value to a third value.

Abstract: A self-contained valve positioner having a single valve positioner housing including an actuator portion and having a pneumatically operated actuator unit therein carrying a main valve member to position the main valve member relative to a main valve seat in a valve unit in relation to the magnitude of a single pneumatic signal directed to the valve positioner and being utilized as the fluid source therein for pneumatically operating the actuator unit, the actuator unit having structure in the housing to cause the actuator unit to progressively open the valve member as the signal being directed to the valve positioner progressively increases from a first value to a second value and thereafter to progressively close the valve member as the signal being directed to the valve positioner progressively increases from the second value to a third value.

Abstract: A self-contained valve positioner having a single valve positioner housing including an actuator portion having a pneumatically operated actuator unit therein carrying a main valve member to position the main valve member relative to a main valve seat in a valve unit in relation to the magnitudes of first and second pneumatic signals directed to the valve positioner and one of which is being utilized as the fluid source therein for pneumatically operating the actuator unit, the single valve positioner housing including a pilot valve portion having a pilot valve relay disposed therein that initially receives the pneumatic signals and causes the one signal to operate the actuator unit in a manner to progressively open the valve member as the first signal being directed to the value positioner progressively increases from a first value to a second value and thereafter to progressively close the valve member as the first signal being directed to the valve positioner progressively increases from the second value t

Abstract: A pilot operated valve positioner having a pilot valve unit operated by a pneumatic signal to pneumatically operate an actuator unit carrying a main valve member to position the same relative to its main valve seat in a valve unit in relation to the magnitude of the pneumatic signal, the actuator unit having a range spring and a feedback spring for the pilot valve unit. The springs are coiled compression springs and are substantially concentrically mounted. The pilot valve unit has a feedback positioning diaphragm and part of its housing concentrically disposed in one end of the range spring to render the valve positioner relatively small and compact.

Abstract: A self-contained valve positioner having a single valve positioner housing including an actuator portion and having a pneumatically operated actuator unit therein carrying a main valve member to position the main valve member relative to a main valve seat in a valve unit in relation to the magnitude of a single pneumatic signal directed to the valve positioner and being utilized as the fluid source therein for pneumatically operating the actuator unit, the housing including a pilot valve portion and the actuator unit having a pilot valve relay disposed in the pilot valve portion and that initially receives the pneumatic signal and causes the signal to operate the actuator unit to progressively open the valve member as the signal being directed to the valve positioner progressively increases from a first value to a second value and thereafter to progressively close the valve member as the signal being directed to the value positioner progressively increases from the second value to a third value.

Abstract: A differential vacuum regulator having an input chamber and an output chamber and a control arrangement for providing an output signal in the output chamber that has a constant differential value from the value of an input signal in the input chamber, the regulator having a condition responsive unit that is independent from the value of the input signal and is adapted for varying the differential value in relation to the condition being sensed by the condition responsive unit.

Abstract: A differential vacuum regulator having a housing provided with an inlet for being interconnected to a vacuum source and an outlet for being interconnected to a vacuum operated device, valve means being carried by the housing for interconnecting the inlet and the outlet together to provide a certain vacuum level at the outlet when the regulator senses a temperature below a certain temperature and for interconnecting the inlet and the outlet together to produce a different vacuum level at the outlet when the regulator is sensing the certain temperature.

Abstract: A condition responsive valve construction for varying the output pressure of the valve construction in relation to a movable part of a condition responsive device that is moved in relation to the condition sensed thereby, the valve construction having a housing provided with an inlet to be interconnected to a fluid pressure source and an outlet separated from the inlet by a main valve unit and being adapted to be interconnected to vent by a vent valve unit. A biasing spring operatively interconnects the movable part of the condition responsive device to a movable vent valve seat of the vent valve unit to urge the same to an open condition relative to a movable vent valve member by a force that is changeable by the condition sensed by the condition responsive device. A sealing and biasing bellows construction is operatively interconnected to the vent valve seat to tend to urge the same to a closed condition thereof.

Abstract: A system having a vacuum source, a pressure source and a pressure operated control device. A pneumatically operated control unit is provided for increasing a pressure signal from the pressure source to the device as the value of the pressure of the pressure source increases from a first value to a second value and for thereafter decreasing the pressure signal from the pressure source to the device as the value of the pressure of the pressure source further increases from the second value thereof to a third value thereof, the control unit producing the signal in substantially the same manner but at different values for different levels of vacuum at the vacuum source thereof. The control unit can include a temperature responsive valve for substantially linearly changing the magnitude of the signal to the device in relation to a certain temperature range.

Abstract: A pilot operated valve positioner having a pilot valve unit operated by a pneumatic signal to pneumatically operate an actuator unit carrying a main valve member to position the same relative to its main valve seat in a valve unit in relation to the magnitude of the pneumatic signal, the actuator unit having a range spring and a feedback spring for the pilot valve unit. The springs are coiled compression springs and are substantially concentrically mounted. The pilot valve unit has a feedback positioning diaphragm and part of its housing concentrically disposed in one end of the range spring to render the valve positioner relatively small and compact.

Abstract: A differential vacuum regulator having a housing provided with an inlet for being interconnected to a vacuum source and an outlet for being interconnected to a vacuum operated device, valve means being carried by the housing for interconnecting the inlet and the outlet together to provide a certain vacuum level at the outlet when the regulator senses a temperature below a certain temperature and for interconnecting the inlet and the outlet together to produce a different vacuum level at the outlet when the regulator is sensing the certain temperature.

Abstract: A differential vacuum regulator having an input chamber and an output chamber and a control arrangement for providing an output signal in the output chamber that has a constant differential value from the value of an input signal in the input chamber, the regulator having a condition responsive unit that is independent from the value of the input signal and is adapted for varying the differential value in relation to the condition being sensed by the condition responsive unit.

Abstract: A system having a vacuum source, a pressure source and a pressure operated control device. A pneumatically operated control unit is provided for increasing a pressure signal from the pressure source to the device as the value of the pressure of the pressure source increases from a first value to a second value and for thereafter decreasing the pressure signal from the pressure source to the device as the value of the pressure of the pressure source further increases from the second value thereof to a third value thereof, the control unit producing the signal in substantially the same manner but at different values for different levels of vacuum at the vacuum source thereof. The control unit can include a temperature responsive valve for substantially linearly changing the magnitude of the signal to the device in relation to a certain temperature range.

Abstract: An adjustable bimetal construction adapted to provide an adjustable throttling range and having a first bimetal member and a second bimetal member, one opposed end of the first bimetal member being operatively interconnected to the frame while the other end thereof is movable relative to the frame and one opposed end of the second bimetal member also being operatively interconnected to the frame while the other end thereof is movable relative to the frame. A device operatively interconnects the other ends of the bimetal members together to provide a combined bimetal action at the other ends thereof which can be adjusted through different positions of the device.

Abstract: A fluid control system being responsive to humidity conditions as sensed by a humidity responsive control device that controls a fluid bleed means of the control system in response to humidity conditions sensed thereby, the humidity responsive control device having a flapper spring lever pivotally carried by a frame in a cantilevered manner and having a free end controlling a bleed valve seat. The flapper spring lever has a normal bias to tend to move the flapper end to one of its pivoted positions relative to the valve seat and is operatively associated with an actuating lever by a spring means, the actuating lever being controlled by a humidity sensing means.