Ss 304 Carbon Cast Steel Floating Ball Valve Automatic Water Level Control Metal Seated

Ball Valve-Floating ball valve

Application

Floating ball valves are suitablefor use on various kinds of pipelinesof Class 150 to Class 1500,PN16 to PN100 to turn on off the pipeline medium,of which the operation types include manual,worm gear and pneumatic or electric actuators.
 

Costruction and Features of Floating Ball Valve

1)Reliable Seat Seal

    The structure design of elastic sealingring has been adopted for floating ball valves. This seat design features a bigger sealing pressure ratio between the ring surface and the ball when mediumpressure 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 undertakethe bigger force pushed by the medium without any damage.

2)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.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,floating ball valves with fire safe design can meet the requirement of API 607,API 6FA,BS6755 and JB/T 6899.

3)Reliable Stem Seal

The blow-out proof design has been adopted for the stem to ensure that even if the pressure in the bodycavity is risen acc-idently and the packing flange becomes invalid,thestem 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,

4)V type packing structure has been employed to effectively trans form the pushing force of the gland flange and the medium pressure into the sealing force against the stem.

5)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 witha PTFE bush to prevent the galling against and friction between thestem,which can also reduce the operation torque of the valve.

6)Anti-static Feature

The traditional packing flange design has been improved to be of two piece structure, i.e.,being asa packing flange plate and a follower, the latter contacts the flange plate with spherical surface. Thus, the follower remains vertical always,andis 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.

7)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 withthe lever in 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.