Top Entry Trunnion Ball Valve

Onero Valve Corporation, founded in 1986, is located in Yongjia County, Zhejiang Province, where is known as "Chinese township of pumps and valves ". Onero Valve Corporation focused on ball valve products manufacturing more than 20 years. And the registered capital has 7.3 million dollars. Our company is one of the earliest ball valve manufacturers in Wenzhou. Onero Valve Corporation Currently has two production bases, all kinds of technical personnel 40 people, and more than 140 employees. The factory has a full range of equipment, and there are specialized in processing, batching, assembly, testing ,painting and boxing personnel, who strictly control the process.

The top entry trunnion ball valve is a highly advanced valve that is designed to provide efficient and reliable performance in a wide range of applications. This innovative valve design features a unique top entry design that allows for easy access to the internal components of the valve, making it easier to maintain and repair when necessary. One of the key benefits of the top entry trunnion ball valve is its ability to provide reliable sealing performance in high-pressure and high-temperature applications. The valve's trunnion-mounted ball design ensures that the ball remains in constant contact with the sealing surfaces, providing maximum sealing performance and preventing leakage. In addition to its exceptional sealing performance, the top entry trunnion ball valve is also designed to provide smooth and effortless operation. With its advanced design features and high-quality materials, this valve is built to last and provide reliable performance for years to come.

These ball valve concepts refer to the manner in which the valve ball and its internal components may be reached, either from the side of the valve or from the top of the valve (top entry).

The top entry design is used when repeated inline maintenance operations are required on the valve. This is due to the fact that the top entry trunnion ball valves provide quicker and faster access to the ball and valve trim relative to the side entry valves that need more repair time and space for the same operations.

The two ball valve design can be distinguished as follows: Top entry trunnion ball valves are normally manufactured with cast steel bodies; while side ball entry valves are constructed with (strong) fabricated steel bodies. Top entry trunnion ball valves include a monolithic design (made of one piece); and side entry valves are made of two or three pieces of assembly. Top entry trunnion ball valves need more non-destructive testing than side entry ball valve due to their castings; side entry valves are simpler to install and assemble than the top entry, which takes a long time of training and workmanship to function properly. Top entrance ball valves are usually more costly than side entrance valves and have longer lead times attributed to the casting operations used to produce the body.

Top entry trunnion ball valve should be inspected regularly during operation and any findings should receive immediate attention in order to avoid any further damage to the top entry trunnion ball valve or the system. Regular inspection and maintenance should be scheduled at a minimum of twice per year, or more often if required.

In less corrosive environments, it is suggested to check the top entry trunnion ball valve body thickness every six months. In more corrosive environments, it should be checked every three months. The top entry trunnion ball valve seat pocket area is a primary area where the operation of the top entry trunnion ball valve can be affected by debris and contaminants within the line. To ensure the seat's operational movement within the valve, it is recommended that the valve seat pockets be cleaned routinely with a product designed for the valve trim and the service needs. Routine service can vary depending on the severity of the operating service of the valve. Once the top entry trunnion ball valve is in service, it is recommended to use a seat cleaning detergent or light lubricant to clean the seat sealing surface of any debris which may have been introduced into the piping or the top entry trunnion ball valve at the time of installation.

Recommended cleaning of the valve seats should be at minimum every six months; valves which are operated more often should be every three months to maintain and ensure the integrity of the seat's seal.

In the event your top entry trunnion ball valve seats or stem fail, it is possible to restore the seal or to minimize any seat or stem leakage for a temporary or an extended period of time with the injection of a valve sealant in a sufficient amount to create the necessary seal.

Valves must be equipped with the seat and or stem injection feature. Injectable seat and seal restoration is for a temporary period of time, until it is convenient to remove the top entry trunnion ball valve from service and replace the seats or seals.

For temporary seat and seal restoration while the valve is under pressure, position the top entry trunnion ball valve in the fully closed position. Carefully remove the safety cap from the grease fitting. Never remove the grease fitting when the top entry trunnion ball valve is under pressure. Attach the grease gun connection onto the grease fitting and commence injecting the sealant.

Caution: Follow all recommended safety and operating instructions from the grease gun and the sealant manufacture. If injection of the sealant is difficult, flush the valve with a valve cleaner and inject sealant again. Always remember to replace the safety caps on the grease fittings.

Factory supplied replacement parts should be used any time replacement parts are required. Before removing the top entry trunnion ball valve from a pipeline, always mark the connecting flanges for proper fitment and valve flow direction.

After any top entry trunnion ball valve repair,for proper bolt torque to assemble the top entry trunnion ball valve. Over torquing can cause deformation of the body/bonnet flange causing leakage. Failure to properly follow the tightening sequence will result in the gasket not being compressed evenly, resulting in gasket leakage. Warning: Never use impact devices to tighten the bolting on the body/bonnet connections. Use suitable designed mechanical devices such as hand torque wrenches for tightening .Torque wrenches and standard wrenches may be used in combination when performing tightening sequences. To assure the top entry trunnion ball valve is sealing properly, perform the required pressure testing per recognized and applicable design standards.