1.Fire safe design: According to API 607/BS6755 specification. In the event of a fire at the valve site, the sealing ring made of secondary sealing non-metallic material is decomposed or destroyed at high temperature, and the primary metal seal can be quickly attached to the ball to seal. The unique two-stage sealing seat structure design ensures the reliability of valve seat fire protection.
2.Anti-static design: The electrostatic extraction device of spring and small ball is used to form an electrostatic channel between the ball and the valve body through the valve stem, so that the static electricity caused by the friction between the ball and the sealing ring is led to the earth through the valve body, which can prevent fire or explosion and other hazards caused by electrostatic sparks.
3.Sealing emergency rescue and valve lubrication: When the valve seat and stem seals are damaged and leaked, the sealing grease injected by the grease injection valve can achieve instantaneous sealing. In normal operation, the valve stem and ball can be lubricated by injecting grease to make the valve opening and closing more flexible and convenient.
4.Middle Cavity self-pressure relief function: When the pressure in the valve chamber is abnormally elevated, the piston valve seat structure can ensure that the pressure in the valve chamber is pushed away from the valve seat, so that the pressure in the valve chamber is released to ensure the safety of the valve.
5.Top Flange Arrangement: The flange on the valve is designed according to ISO 5211, which facilitates the installation of any type of drive by means of brackets and coupling sleeves.
6.Extending Shaft: For the buried valve, according to the needs of installation and operation, the stem of the valve can be lengthened, and the size can be customized according to the requirements of customers. All emergency grease injection devices for sewage pipes and exhaust pipes are lengthened accordingly. Other relevant pipes shall be close to the extended part of the valve. The drain valve, vent valve and grease injection valve shall be connected to the ground for installation, so as to facilitate regular maintenance of the main valve. The valve surface is coated with corrosion resistant asphalt, polyurethane or epoxy resin according to the specification to adapt to the buried installation and use conditions.
7.Extension Bonnet: For valves that are required to work at low temperatures, by lengthening the valve cover, the the distance between the valve body and the stem seal area is increased, avoiding the effect of temperature on the seal. The lengthened height is according to the provisions of the standard, but also according to customer requirements.
8.Valve structure: The valve adopts three-body side forging welding structure, and the ball is fixed by the built-in support plate structure of the valve body, which eliminates the excessive torque caused by the huge sealing load formed by the ball and the sealing seat driven by the inlet pressure. The surface finish of the ball is mirror-like, and the use of inlaid bushings with good self-lubricity enables small opening and closing torques even at the highest operating pressure.
9.Welding structural characteristics: The welding of the left and right body and the middle body adopts typical narrow gap submerged arc multi-layer welding.The special flux used in welding has the required current carrying capacity and slag removal effect, and the welding layer particles are fine, which can meet the performance of high toughness weld metal. 100% ultrasonic inspection and hardness test of welds to ensure the welding quality of welds.
