What is the difference between a top load ball valve and a top entry ball valve? Please leave footpr

Top-loading ball valves are top-entry ball valves, and there is no difference.

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. Although the ranking may change due to time and market conditions, the following brands are generally considered to be among the top brands in the valve industry: Water System Valves and Industrial ValvesThe following more influential first-line brands can be used as a reference, but are for reference only:

Suzhou Neway Valve, Shanghai Qizhong Valve, Shanghai Guanlong Valve, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

Integral valve body design, top-mounted pivot fixed support, flange structure, integral pivot fixed club design, double blocking and venting function, high-strength integral club structure.

To ensure the precise positioning of the ball, the pivot adopts an anti-blowout protection structure, 2 sets of O-rings, plus a fireproof packing structure on the valve stem.

Effectively preventing leakage and corrosion, the low coefficient of friction bearing makes the nylon sealed metal seat move towards the ball due to the nickel corrugated spring.

With inlet and outlet two-way sealing function, the standard Nibi or Long and PEEK seat with superior performance ensures an effective seal sealant inlet design under low pressure conditions, and sealant can be inhabited in emergency conditions.

**Replaceable clubs. The torque of the metal seat and corrugated spring of the valve stem sealing ring is reduced to the smallest hole, which is convenient for the valve to operate the ball rod and the valve body in effective contact, and the anti-static grounding equipment with superior performance presets the drive device platform and screw hole, and can be equipped with the fire protection function of the drive device at any time; When the seat burns out or is damaged, the metal seat automatically adheres to the ball, and there is a smaller leakage between the seat and the ball.

Top-mounted ball valves are widely used in oil and gas pipelines, as well as in oil production, oil refining, petrochemical, chemical, chemical fiber, metallurgy, electric power, nuclear power, food and paper making and other devices.

The top-mounted ball valve is simple and quick to disassemble on the pipeline, and the maintenance is convenient and fast. When the valve fails on the state shed pipeline and needs to be repaired, it is not necessary to disassemble the valve from the pipeline, but only need to remove the middle flange bolt and nut, remove the valve cover and valve stem assembly from the valve sail body together, and then take out the ball and valve seat assembly. The ball and seat can be repaired.

This type of repair saves time and minimizes losses in production.

Top-mounted ball valves are divided into floating ball valves and fixed ball valves.

Tops floating ball valve nominal size DN200. A compression spring is applied to the ball, and the function of the compression spring is to apply preload force on the ball, so that the sealing surface of the valve seat is in close contact under any circumstances, and the sealing performance is good. With a 10° wedge angle on the contact surface between the seat and the body, the seat is self-locking, and in the direction of the line, the seat does not displace when the seat is subjected to high pressure.

Therefore, the valve of this structure has the characteristics of gate valve and the advantages of ball valve. During the maintenance inspection, it was found that the valve body and valve seat are prone to leakage, and if the preload of the spring is increased, the closing torque of the ball valve will inevitably be increased. In order not to increase the closing torque of the ball valve, a rubber O-ring was added to the back of the seat seal face, which solved the leakage problem on the back of the seat seal face.

The disadvantage of top-mounted fixed ball valve is that the spring preload can not be adjusted and controlled, and the spring compression is large during assembly, and the assembly is difficult. In order to solve this problem, ANSI 302 was used instead of 302 as the spring material has a good spring rate and its corrosion resistance is similar to that of 304. In addition, a spring seat and an adjustment nut are added, the outer circle of the valve seat and the spring seat are turned into threads respectively, and the spring is pressed into the spring seat with an adjustment nut, and the valve seat assembly is loaded into the valve body.

Since the spring is compressed before installing the ball, it is convenient to install the ball. When the ball is assembled, the adjustment nut is withdrawn from the spring seat, and the spring has less preload on the ball. If you want to increase the preload, you can adjust it with an adjustment nut.