Compared with other valve products, the self pressure valve has its feature that it is used in high temperature and high pressure circumstance and some parts are of welding type. Its performance and technical features and special working conditions endow the product with characteristics that can’t be replaced by other products.
The self pressure valve of Y&B Company adopts mold forged, casting or precise CNC machining. It can provide absolutely reliable pressure with sealed bonnet. And it is guaranteed that the seat leakage is lower than the standard leakage. It passed the USA VOC middle shaft leakage test. If it is cast, the important parts of shell and butt-welding ends are subjected to radiation test according to specifications in ASME B16.34.
For the self pressure valve of Y&B Company, the body materials include carbon steel and Cr-Mo-V Steel. Overlay welding by cobalt-base alloy is performed on the sealing surface. The stem surface adopts anticorrosive nitriding