Fixed ball valve is a new generation of high-performance ball valve, which is suitable for long-distance pipeline and general industrial pipeline. Its strength, safety and resistance to harsh environment are specially considered in the design, and it is suitable for various corrosive and non corrosive media. Compared with the floating ball valve, when it works, all the forces generated by the fluid pressure in front of the valve on the ball are transmitted to the bearing, which will not make the ball move towards the valve seat, so the valve seat will not bear excessive pressure, so the fixed ball valve has small torque, small deformation of the valve seat, stable sealing performance and long service life, which is suitable for high pressure and large caliber occasions. Advanced spring pre seat assembly, with self tightening characteristics, to achieve upstream sealing. Each valve has two seats, which can be sealed in each direction, so there is no flow restriction in the installation, which is two-way. This valve is generally installed horizontally.
Online InquiryFixed ball valve is a new generation of high-performance ball valve, which is suitable for long-distance pipeline and general industrial pipeline. Its strength, safety and resistance to harsh environment are specially considered in the design, and it is suitable for various corrosive and non corrosive media. Compared with the floating ball valve, when it works, all the forces generated by the fluid pressure in front of the valve on the ball are transmitted to the bearing, which will not make the ball move towards the valve seat, so the valve seat will not bear excessive pressure, so the fixed ball valve has small torque, small deformation of the valve seat, stable sealing performance and long service life, which is suitable for high pressure and large caliber occasions. Advanced spring pre seat assembly, with self tightening characteristics, to achieve upstream sealing. Each valve has two seats, which can be sealed in each direction, so there is no flow restriction in the installation, which is two-way. This valve is generally installed horizontally.
Summary
Fixed ball valve is a new generation of high-performance ball valve, which is suitable for long-distance pipeline and general industrial pipeline. Its strength, safety and resistance to harsh environment are specially considered in the design, and it is suitable for various corrosive and non corrosive media. Compared with the floating ball valve, when it works, all the forces generated by the fluid pressure in front of the valve on the ball are transmitted to the bearing, which will not make the ball move towards the valve seat, so the valve seat will not bear excessive pressure, so the fixed ball valve has small torque, small deformation of the valve seat, stable sealing performance and long service life, which is suitable for high pressure and large caliber occasions. Advanced spring pre seat assembly, with self tightening characteristics, to achieve upstream sealing. Each valve has two seats, which can be sealed in each direction, so there is no flow restriction in the installation, which is two-way. This valve is generally installed horizontally.
The fixed ball valve has two piece and three piece valve body structures. The middle flange is connected by bolts. The reinforced polytetrafluoroethylene is inserted into the stainless steel ring for sealing. The spring is set at the back of the steel ring to ensure that the valve seat is close to the ball body and keep the sealing. The upper and lower valve stems are equipped with PTFE bearings to reduce friction and labor saving operation. The bottom of the small shaft is equipped with an adjusting plate to ensure the joint position of the ball and the sealing ring. Full bore: the flow bore of the valve is consistent with the inner diameter of the pipeline, so that the pipeline can be cleaned.
Performance advantages
1. Labor saving operation: the ball is supported by upper and lower bearings to reduce friction and eliminate excessive torque caused by the huge sealing load formed by the inlet pressure pushing the ball and the seal seat.
2. Reliable sealing performance: PTFE single material sealing ring is embedded in the stainless steel valve seat, and the end of the metal valve seat is provided with a spring to ensure sufficient pre tightening force of the sealing ring. When the sealing surface of the valve is worn during use, the valve continues to ensure good sealing performance under the action of the spring.
3. Fire protection structure: in order to prevent the occurrence of sudden heat or fire, the Teflon sealing ring will burn down and cause large leakage, which will promote the fire, a fire-proof sealing ring will be set between the ball and the valve seat. When the sealing ring is burnt down, under the action of spring force, the sealing ring of the valve seat will be pushed rapidly onto the ball to form a metal and metal seal, which will play a certain degree of sealing effect. The fire resistance test meets the requirements of apl6fa and apl607 standards.
4. Automatic pressure relief function: when the medium pressure in the stagnant cavity of the valve increases abnormally and exceeds the pre] force of the spring, the valve seat retracts away from the ball to achieve the effect of automatic pressure relief. After pressure relief, the valve seat automatically recovers
5. Drain pipe: drain holes are set up on the upper and lower parts of the valve body to check whether the valve seat leaks. When the valve is fully open or fully closed in operation, the pressure in the middle cavity can be removed and the packing can be replaced directly; the retention in the middle cavity can be discharged to reduce the pollution of the medium to the valve.
Characteristic
function
1. Double block and discharge function: fixed ball valve adopts spring pre tightened floating valve seat. When the valve is in full open or closed state, the valve seat at upstream and downstream sides blocks the flow, and the retention in the middle cavity of the valve body is discharged through the discharge valve.
2. Automatic pressure relief function: when the temperature of the retention medium in the valve body cavity rises and causes abnormal pressure rise, it is not necessary to pass through the safety valve, but only rely on the valve seat function to automatically relieve pressure, which is very important to ensure the safety of the valve when conveying liquid medium.
3. Fire safety structure: all valves have fire safety functions, and their design and manufacture comply with the requirements of API 607 and API 6fa.
Advantage
1. Seal emergency grease injection rescue: due to unexpected failure of valve seat seal caused by foreign matters or fire in the medium, the grease injection valve provides a quick connection with the grease injection gun, and the inlet pump conveniently and quickly injects the sealing grease into the sealing part of valve seat to alleviate leakage.
2. Reliable valve stem seal and low operating torque: in addition to standard sealing rings, O-ring is also set on the packing gland, double sealing ensures the reliability of valve stem seal; graphite packing and sealing grease are added to minimize the leakage of valve stem after fire. The sliding bearing and thrust bearing of the valve stem make the valve easy to operate.
3. Full bore or reducing: full bore or reducing structure can be selected as required. The flow diameter of the full bore valve is the same as the inner diameter of the pipeline, which is convenient for pipeline cleaning.
4. Valve stem can be lengthened: according to the needs of installation or operation, the valve stem can be lengthened. The extended rod ball valve is especially suitable for urban gas and other occasions where buried pipelines are required. The size of the extended stem shall be determined according to the customer's requirements.
5. Flexible operation: the valve seat and stem bearing with small friction coefficient and good self-lubricating property are adopted, which greatly reduces the operating torque of the valve. Therefore, the valve can be operated flexibly and freely for a long time even if no sealing grease is provided.
Application scope
The fixed ball valve is applicable to various pipelines of class150-class1500, pn16-pn100, JIS 10k-jis 20K, and the applicable temperature is: - 196-350 ℃, which is used to cut off or connect the medium in the pipeline. Different materials are selected, which can be respectively applied to the transmission of water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea, etc., and widely used in petroleum refining, long-distance pipeline, chemical industry, manufacturing, etc Paper, pharmaceutical, water conservancy, electric power, municipal administration, steel and other fields. The driving mode of fixed ball valve is worm drive, manual, pneumatic or electric. The fixed ball valve is generally connected by flange or by butt welding.