SBV 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. The internal parts of valve are carefully designed and selected to ensure reliability under all kinds of work condition.

 

1. Advaned and Exclusive Seat Design 

With many years of ball valve manufacturing experience and advanced technology from abroad, the cone sealing surface makes the sealing more reliable. Professional processing of valve seat enables abrasion coefficient of valve seat to be low and operation torque of valve to be small.

 

SBV 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.(PIC.1)

 

3. 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.(PIC.2)

 

4. Anti-Static Design
During turning of the stem to opening and closing the valves, the static electricity is easily caused by sparks generated by the friction among ball and stem, stem and body. Antistatic devices which is assembled by a static-conduction spring will assure the electrical conductance continuity, so, the static electricity is conducted to the ground and prevent the possible risk of fire or explosion. So, system safety is secured.(PIC.3)

 

5. 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.

6. Wrench/Lever with valve Open/Close Indication
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.(PIC.4)

 

Body and cap connection is sealed by SS304/SS316+graphite spiral wound gaskets. In order to prevent leakage when in case of fire, high temperature or vibrations, metal-to-metal sealing design between the body and cap is adopted as a backup of primary seal.

 

8. Low Emission Packing Design (Environmental Protection)
With more and more concern for environment protection in the whole world, low emission valve will be widely used. Low emission valve can prevent poisonous, flammable, explosive medium from leakage to pollute the atmosphere, and also low emission valve can minimum fugitive emission of VOC to help solve the problem of "Global Warming"

Because of frequent opening and closing of the valves, normal graphite granule can be drawn by the stem, which will cause leakage. The Low Emissions valves designed by SBV use special low emissions packing to ensure the seal of stem. The cone packing is made of expanding graphite in die-formed rings and has features of heat resistance, less stress relaxation and low creep. With this special structure, it allows for a low-friction on rotary & rising stem valve, therefore providing the stabilized sealing performance for long cycle life.

 

It is also a key point to control the stem and stuffing box finishing when marching. The stem is made by cold rolling and stem surface finishing is controlled by Ra 0.4, which can reduce friction for stem moving and ensure the graphite to fill and migrate into the stem micro scratches, and function as a lubricant to reduce stem leakage. The stuffing box surface is controlled within Ra 1.6 and Ra 3.2 for better holding of the packing ring and results in a better sealing performance.

The top working flange of SBV Forged Floating Ball Valves is designed according to ISO 5211,which facilitates installation of electric actuator, pneumatic actuator and hydraulic actuator according to engineering requirements of the customers.

 

The valve stem can be extended for low temperature services as per the customer’s requirements. The extension length is named by the customer.