The stop valve has five over-flow areas that need attention. According to the flow direction sequence, they are end channel area, waist drum throat area, valve seat opening area, flow area between valve disc and valve seat when the valve is opened, and flow area of rear waist drum...
The independent valve seat of the globe valve is usually connected by welding. Because the welding rod should go deep into the valve body during welding, the convenience of welding must be considered when designing the valve seat fitting surface. According to the past experience, two structures are recommended...
According to the current standard API 623-2013 “steel globe valves – Flanged and butt welded ends, bolted bonnet”, bs1873-1975 “steel globe valves and stop check valves with flanged and butt welded ends for petroleum, petrochemical and related industries”, and GB / T In the standard 12235-2007 “steel globe valves...
Stop valve is an indispensable fluid control product in modern industry, which plays a role of cutting off and throttling in the pipeline. Stop valve belongs to the category of general valve, which is widely used and widely used. Because its manufacturing process is not very complex, there are...
(1) Preparation of main metal charge Weigh and prepare the main metal charge. (2) Preparation of main accessories Weigh and prepare the main accessories. (3) Molten iron smelting The charge is added in the order of pig iron, recycled iron and scrap steel. Due to the difference factors such...
The main defect of the inlet cylinder casting in the NDT of VT, MT and Pt is that there are excessive magnetic marks in Mt. Wet fluorescent magnetic powder was used for MT inspection of all areas required by the drawing. The test results showed that there were several...
(1) The surface quality and defects of the air inlet cylinder are mainly inspected by visual inspection (VT), magnetic particle inspection (MT) and liquid penetrant inspection (PT). Visual inspection (VT) is a nondestructive method for the first stage inspection of the quality of the cylinder castings directly with the...
According to the analysis of the casting structure and key casting technology difficulties of the intake cylinder, this paper mainly focuses on the theoretical research, design and calculation of the core casting technology scheme and process of the intake cylinder, and determines the final optimization process technology scheme. In...
Before 2013, the company’s production performance of gas turbine castings was dominated by only a few small and medium-sized steel castings such as valves, gas seals and blade rings, and almost all the large cylinder castings and other difficult parts and components required for supporting were purchased from the...
Foreign technology status: Hangzhou Steam Turbine Casting and Forging Co., Ltd. pointed out in the patent technical background of “a kind of gas turbine inlet cylinder and manufacturing process”, that a Japanese company provided a domestic company with a nodular cast iron inlet cylinder casting used for gas turbine...