Product characteristics and causes of problems of corrugated pipe globe valves

Bellows globe valves, commonly referred to as diaphragm valves, are a relatively new type of globe valve that has some unique advantages of its own structure, such as no friction on the switch, less wear on the seal, and small opening and closing torque. This can reduce the specifications of the equipped actuator. Equipped with a multi turn electric actuator, it can achieve the adjustment and strict cutting of the medium.

The corrugated pipe sealing globe valve adopts a design of corrugated pipe sealing, completely eliminating the shortcomings of ordinary valve stem packing seal aging and easy leakage. It not only improves energy efficiency, increases production equipment safety, reduces maintenance costs and frequent maintenance, but also provides a clean and safe working environment.

Product features:

1. The product has a reasonable structure, reliable sealing, excellent performance, and beautiful appearance;

2. The sealing surface is welded with Co hard alloy, which is wear-resistant, corrosion-resistant, with good friction resistance and long service life;

3. The valve stem is quenched and tempered with surface nitriding treatment, which has good corrosion and wear resistance properties;

4. Dual sealing for more reliable performance;

5. The valve stem lifting position indication is more intuitive;

6. The material of parts, flanges, and welding dimensions can be reasonably selected according to actual working conditions or user requirements to meet various engineering needs.

The bellows sealed globe valve adopts a unique double bellows sealing design, which completely eliminates the problem of valve stem packing sealing leakage and meets the strictest leakage level requirements. If the bellows unfortunately fails, the packing seal on the valve stem can provide a secondary seal to prevent leakage.

The bellows sealing structure not only eliminates leakage, but also requires no maintenance. If internal components need to be replaced, it is convenient, simple, fast, all components meet standards, and interchangeable.

The valve cap/cover is equipped with an additional oil injection hole to lubricate the valve stem and nut sleeve.

The bellows sealed globe valve adopts a unique spherical conical valve core instead of the traditional flat valve core. Flow control can be roughly conducted manually. Valve core Case-hardening treatment improves sealing performance. Vertical installation is allowed below DN150, and valve core can adjust itself.

The corrugated pipe globe valve is suitable for cutting or connecting pipeline media in various working conditions such as petroleum, chemical, pharmaceutical, and power industries with a nominal pressure of PN1.6~6.4MPa/150LB and a working temperature of -29~425 ° C.

The leakage of corrugated pipe shut-off valves is generally divided into two types: internal leakage and external leakage, with many causes of leakage. Internal leakage is generally caused by solid impurities in the fluid medium that damage the sealing surface, while external leakage is mainly caused by the failure of the sealing boundary caused by the rupture of the corrugated pipe. Based on the analysis of on-site usage, the main reasons for valve stem leakage are related to the valve structure, working environment, and operating methods.

The valve stem of the corrugated pipe stop valve adopts a double sealing structure of corrugated pipe and packing. The corrugated pipe is welded with the inner and outer lining rings to form a corrugated pipe component, and then welded with the valve stem and guide body to prevent the medium from leaking outward through the valve stem. The movement distance of the valve stem up and down is limited by the flat key I. When the valve is closed, the flat key I moves downward until the valve disc fully contacts the valve seat. When the valve is opened, the flat key I moves upwards until the upper end face of the flat key I contacts the lower end face of the lower packing. Due to the use of PTFE material as the lower filler, the material is relatively soft, and if excessive