All-welded forged steel ball valves are for use in pipelines. They guarantee safe flow stoppage through the combination of an all-welded forged steel body, eliminating the need for longitudinal welds, and a system of double seals in all seal assemblies including the seat seal assembly.
KITZ’s all-welded forged steel ball valves can be used to meet all of the needs required by a pipeline ball valve. Their main features are detailed below.
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All-welded forged steel ball valve
Features
- All-welded one piece forged steel, eliminates the need for longitudinal welds, protecting product quality.
- The seat seal mechanism utilizes a “floating seal”, which makes use of spring force and fluid pressure, and can be used with both low and high-pressure media.
- The use of a rubber seat “double seal system” (metal/soft – metal seat) in the valve seat seal assembly produces a superior seal, durability and rapid recoverability.
- A wiper installed in the seat seal assembly prevents the entry of foreign substances and uniformly distributes sealant.
- The double seal stem assembly is designed with an eye to maintenance. The upper seal assembly can be changed even when the valve is in operation.
- The valve comes equipped with a safety lock to prevent the vent valve from unexpectedly flying off.
- Valves are designed to allow for x-ray inspection of all weld locations, including final welds. (Bore diameter of 4B and greater)
Construction
- Body
The forged steel body, which has no longitudinal welds and provides superior material strength, and the body cap are welded on both sides of the stem.
- Seat seal
The spring force of the rubber seat compresses the primary seal, pressing the ball into the outer ring. Additionally, force generated by the fluid pressure is utilized, compressing the secondary seal and pressing the seat retainer into the ball, thus applying a “double seal”. Furthermore, a wiper is included inside the seat assembly to prevent the entry of foreign substances and uniformly distribute sealant.
- Stem seal
The trough hole and matching face together form a double seal. The bottom stem assembly forms an additional double seal.
- Static-electricity prevention mechanism
This mechanism prevents the transmission of static electricity from the ball’s continuous contact with the valve’s outer ring, seat retainer, spring or body.
- Fire safe construction
The seat seal assembly often touches the metal of the ball or outer ring, creating the potential for fire. Fire safe construction maintains a seal even when the seat is destroyed by a conflagration. Even if the seat retainer’s O-ring is destroyed, the outer ring’s noncombustible retainer ring will prevent excessive leakage.
*Kitz offers the option of adding noncombustible gaskets to the stem and bottom stem assemblies.
- Block and bleed
When a valve is closed, pressure in the body cavity can be expelled into the atmosphere. In such an event, a hose can be attached to a vent valve, allowing the media to be expelled into a safe location. The valve is equipped with a safety lock to prevent the vent valve from blowing off.
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