Abstract: A ball valve includes a valve seat assembly having a lower valve seat, an upper valve seat, packings located in openings formed by apertures in abutting sides of the valve seats, and annular retainers located in central holes through the packings. Each of the components has a profiled inner surface for slidable contact with the ball controlling communication between the fluid passages in the valve box. The use of such components for the valve seat simplifies manufacture, gives a wider choice of materials to be used and reduces costs of repairs.

Abstract: An automatic drain exhaust valve (1) for draining water and the like from a pressurized gas system includes a housing (1') defining an inlet orifice (5), an intermediary space (8), and an outlet orifice (6). Valve surfaces (30 and 40) respectively close the inlet and outlet orifices (5 and 6), said valve surfaces (30 and 40) being respectively moved to open positions by gas pressure from the pressurized gas system acting on surfaces of valve actuators such as pistons (3 and 4). One valve surface (30) is moved to a closed position by springs operating on the piston (3) while the other valve surface (40) is moved to a closed position by fluid pressure from the intermediary space (8) acting on a relatively large surface area (42) of the piston (4).