Twdb is a spring type safety valve of back pressure balance bellows. A series of safety valves with large throat diameter developed on the basis of api526 standard. It can be applied to pressure equipment of air, gas, water vapor, liquid and other media.

Specification 10 "x14" ~ 20 "x24"

Pressure class 150-300, pn16-pn420

Throat diameter V ~ BB (272.19 ~ 1193.55cm)

Temperature range - 29 ° C to 538 ° C

Set pressure 1.72-20.69barg

Standard ASME VIII

performance

Setting pressure deviation: ≤± 3%

Over pressure: ≤ 10%

Opening and closing pressure difference: ≤ 10%

Sealing performance: in accordance with API 527

Characteristic

The valve seat and valve body are separable, easy to maintain and economical.

The umbrella shaped recoil disk can effectively improve the lifting force, and the valve disc can be fully opened and discharged under a small overpressure, so as to achieve the purpose of equipment protection.

The adjusting ring can adjust the satisfactory opening and closing pressure difference.

The materials of the recoil disc and guide sleeve, the valve stem and the adjusting screw shall be reasonably selected and the clearance shall be properly selected to ensure the flexible movement of the valve disc.

The sealing surface of valve disc and valve seat is overlaid with cemented carbide, which ensures high sealing performance and long service life after surface finish grinding.

The bellows in the Balanced Bellows Safety valve can eliminate the influence of back pressure fluctuation on the performance of the valve, and protect the spring and other internal parts from medium corrosion.

Spring and bellows material selection and processing technology, and strict testing and inspection.