Valves

Claim 1

A valve having a valve body providing an inlet port and two outlet ports, a shaft mounted in the valve body for rotary movement and a valve member secured on the shaft for rotary movement therewith to vary the effective areas of the two outlets in such a manner that the total effective area of the two outlets is substantially constant for all positions of the valve member, and a fluid pressure responsive device comprising a bracket secured to the valve body and providing spaced apart side walls, an actuating rod extending at right angles to said shaft and mounted in bearings in said side walls for sliding movement lengthwise of itself, members providing, respectively, a cylindrical socket and a ball engaged in the socket, one of said members being mounted on the shaft and the other of said members being mounted on the actuating rod for adjusting the rotational position of the valve member, a hollow casing part mounted on one of the side walls of the bracket at the side thereof remote from the other side wall, a fluid pressure responsive element mounted in the casing part and connected between the casing part and the rod for moving the rod in accordance with the fluid pressure acting on the element, tie bolts attached to said other side wall of the bracket, a spring platform carried by the tie bolts and spaced from said other side wall at the side thereof remote from said one of said side walls, a helical compression spring seated on the spring platform and disposed between the platform and said other side wall of the bracket, which spring is connected to act on the rod in a sense to oppose movement of the rod in response to an increase in the fluid pressure applied to the element, and stop means for limiting the movement of the rod due to the force of the spring means.