Forged Steel Ball Valves

Forged Floating Ball Valves are used mainly in Oil, Gas Transmission and Distribution Pipeline, Petroleum ,Chemistry, Chemical Fiber, Metallurgy, Paper Pulp etc. The forging material can ensure sufficient rigidity and strength under maximum rated operation pressure without inherent flaw of cast. The Forged Steel Body assures uniform fine grain structure and toughness free from inevitable casting defects such as porosity, abscess, crackle, gas hole. Enough wall thickness of separate Body and Adapters and high strength tie bolts are convenient for valve maintenance and sufficient to bear the stress of pipe.

Standards:

Design and manufacture -  API 6D / BS 5351

Pressure-temperature rating - ASME B16.34

Face to face dimensions - ASME B16.10

Flange type and dimensions – ASME B16.5

Butt-welded end – ASME B16.25

Inspection and test – API 598, ASME B16.34

Size range – NPS ½”  up to  NPS 8”

Pressure rating – 150 lb  to 300 lb

Fire Safe.  Forged Steel Floating Ball Valves fire safe is designed in compliance with API 607-4^th, API 6FA and BS 6755 Part 2. Each possible leakage parts between body and ball, middle flange, body and stem is designed as metal-to-metal contact, when non-metal resilient seats are damaged in a fire or unusual temperature increasing, the upstream medium pressure push the ball into the downstream metal seat lip to cut off the line fluid and prevent the internal leakage due to a secondary metal-to-metal seals.

Blow-out Proof Stem Design.  The stem is designed with integral T-type shoulder to provide blow-out proof effectively. The lower end of stem is terraced and installed from the lower internal part of stem. It is internally inserted as the back seat function to assure stem sealing safety at all pressures.

Locking Devices (on request). To prevent wrong operations of valve switch and improper actions by unpredictable, vibration of the line, the valve is equipped with locking hole at the full open and full close position of the valve, and the valve can be locked with a pad lock. Especially this locking device is uniquely advantageous when the valve is installed outdoors or on the production line of flammable petroleum or chemicals.

Handle Indicating Open/Closing Status of Valve.  Flat square structure is adopted for the head of valve stem which enables the correct connection with the handle and ensures the handle to be in the same direction with flow hole of the ball. When the handle is horizontal with pipeline of the valve, the valve is in the state of opening, when the handle is vertical with pipeline of valve, valve is in the status of closing.