Ball Valve Series
A ball valve is a valve that opens by turning a handle, gearbox or other actuation methods attached to a ball inside the valve. The ball has a hole, or port, through the middle so that when the port is in line with both ends of the valve, flow will occur. When the valve is closed, the hole is perpendicular to the ends of the valve, and flow is blocked. The handle or lever will be inline with the port position letting you "see" the valve's position, position indicators will be applied to gearbox or actuators when required. Ball valves are durable and usually work to achieve perfect shutoff even after years of disuse. They are therefore an excellent choice for shutoff applications. There are two type of ball valve based on the ball type, floating ball valve and trunnion mounted ball valve. Depends on the bore size, ball valve is separated into full port ball valve and reduced port ball valve. There are three type of body styles of ball valve: one-piece, two piece split, three piece split, top entry and welded, WINDMILL ball valves are available in two piece split, three piece split and welded.
Design Features
Reliable Stem Seal
The blow-out proof design has been adopted for the stem to ensure that even if the pressure in the body cavity is raised accidentally and the packing flange breaks, but the stem may not be blown out by medium. The stem features the design with a backseat, being assembled from underneath. The sealing force against the backseat gets higher as the medium pressure becomes higher. So the reliable seal of the stem can be assured under variable medium pressure.
V type packing structure has been employed to effectively transform the pushing force of the gland flange and the medium pressure into the sealing force against the stem.
Based on customers' requirement, a packing tightening design may be employed to obtain more reliable stem packing seal, which is loaded by bevelling spring.
Blowout Proof Stem
Blow-out proof structure is designed to avoid stem blow-out due to accidental medium pressure rise. The stem is positioned by screwed up-end cap.
Locking Mechanism
To prevent mis-operation, the fully opened or closed position of the valve can be locked up, especially when the valves are mounted outdoors or when valves are not allowed to be opened or closed by unauthorized person. A lock hole on the pad is designed for the lock purpose.
Mounting Bracket Provided
WINDMILL has provided for ball valveF with a mounting bracket, through which it is easy to mount a operation device like worm gear, pneumatic and electric actuator etc.
