Interchangeable automatic control valve

An interchangeable automatic fluid control valve, valve actuator adapted to operate in the same diameter valve's housing as made by two different manufacturers, which actuator comprises:

• a. a shaft having two sets of spaced apart threads thereon, the first of said sets is spaced down from the top of said shaft, and the second of which sets is spaced up from the bottom of said shaft,
• b. a diaphragm disk plate having a center opening is disposed on said shaft immediately below the first set of threads,
• c. a diaphragm having a central opening therein is disposed on said shaft beneath said diaphragm disk plate,
• d. a main body of an associated vertically disposed series of components, which are abutted one against another, said main body comprises first and second spaced flange plates each of which has a central bore and each of which is of the same diameter, and each of which has a turned down lip, with an annular member disposed therebetween and within the turned down lip of the first of said flange plates, said main body being disposed beneath said diaphragm on said shaft,
• e. a seat ring disposed between the turned-down lip of said second flange plate and a retention means for said seat ring, and
• f. a pair of nuts threadedly engaged, one with the first and one with the second set of threads on said shaft to retain all of the aforesaid elements on said shaft.