BALL VALVE
Floating Ball Valve
Typical Drawing Of Floating Ball Valve And Parts Composition
Parts And Material List
Note:The chart above only lists out some common composition of steel ball valve parts. We may provide other different parts material composition according to the customer’s request or the actual valve working condition.
Application
Floating ball valves are suitable for use on various kinds of pipelines of Class 150 to Class 1500, PN16 to PN100, and JIS 10K to JIS 20K to turn on or off the pipeline medium, of which the operation types include manual, worm gear and pneumatic or electric actuators.
Construction and features of floating ball valve
Reliable Seat Seal
The structure design of elastic sealing ring has been adopted for floating ball valves. This seat design features a bigger sealing pressure ratio between the ring surface and the ball when medium pressure gets lower, where the contacting area is smaller. Thus, the reliable seal is ensured. When the medium pressure gets higher, the contacting area between seat ring and ball becomes bigger as the sealing ring transforms elastically to undertake the bigger force pushed by the medium without any damage.
Fire Safe Design
With the valve heated in a fire application, the non-metal material parts such as seat sealing ring of PTFE.stem back seat gasket, gland packing, and the sealing gasket between body and bonnet might disintegrate or be damaged due to high temperature. SUNGO’s specially designed structure of auxiliary metal to metal seal is provided to effectively prevent both internal and external leakage of the valve. As required by customers, SUNGO’sfloating ball valves with fire safe design can meet the requirement of API607, API 6FA, BS 6755 and JB/T 6899.
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 risen accidently and the packing flange becomes invalid, 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.
The traditional packing flange design has been improved to be of two piece structure, i.e., Being as a gland flange and gland, the latter contacts the gland flange with spherical surface.Thus, the gland remains vertical always, and is lined internally with a PTFE bush to prevent the galling against and friction between the stem, which can also reduce the operation torque of the valve.
Based on customers’ requirement, a packing tightening design may be employed to obtain more reliable stem packing seal, which is loaded by bevelling spring.
Anti-static Feature
The traditional packing flange design has been improved to be of two piece structure, i.e..being as a packing flange plate and a follower, the latter contacts the flange plate with spherical surface. Thus, the follower remains vertical always, and is lined internally with a PTFE bush to prevent the galling against and friction between the stem, which can also reduce the operation torque of the valve.
Wrong Operation Prevention
To prevent the ball valve from wrong operation, the key lock with 90 of open and close positioning pad has been provided, which can be lockable as required. At the stem head, where the lever fixes, a flat is so designed that the valve opens with the lever เท parallel to piping, and with the lever right-angled to the piping, the valve is closed. So, it is ensured that the valve indicator of open and close can never make mistake.
Mounting Pad Provided
SUNGO company has provided for floating ball valve with a mounting pad, through which it is easy to fix the actuators, such as worm gear, pneumatic and electric actuators,
Main Size And Weight
Forged steel Ball Valve
The floating ball valve manufactured by SUNGO company is generally employing casted steel valve body, however, as required by customers, forged steel valve body is also available, of which the main sizes such as flange connections and face to face dimensions are the same as that of the cast steel ball valve.
Ball Valve With Reuced Bore
In addition to the full bore floating ball valve,SUNGO company is also manufacturing the floating ball valve with reduced bore to satisfy different requirement of customers, which can not only lower the cost and the pricing, but also meet customers’ special requirement.
Note: 1.Sizes of flange connection of the ball valve with reduced bore are the same as that of full bore ball valves.
2. There are two series of face to face dimensions, เท the long series and the short series, for some of ball valves with reduced bore.