Repairing the sealing surface is a large and important task because after long-term use, the sealing surface of the valve disc and the valve seat will wear and the tightness will be reduced. The main...
For stainless steel pipe fittings and flange manufacturers, it is necessary to take into account not only the production cost of flange and pipe fittings, but more importantly, the factors that can prevent...
According to the functions and uses of gate valves and butterfly valves, a gate valve has small flow resistance and good sealing performance. Because the disc of the gate valve is perpendicular to the...
Forging of slip-on flanges can be categorized into rotary forging, roll forging, cross-wedge rolling, rotary swaging, etc. based on the movement mode. For improving the utilization rate of materials,...
Sealing principle The two sealing faces of the screw press against the flange gasket and form a seal, but this also causes damage to the seal. So, in order to maintain the seal, the screw bolts, as well...
There are two problems may occur if the amount of grease is neglected when injecting. One is that the amount of grease is less than the required amount, and the abrasion of sealing surface is accelerated...
The production process of blind flange can be divided into three types: forging, casting and cutting. Cast flange and forged flange have a shape with accurate size, and advantages such as small workload,...
This is an analysis of causes of casting defects during the valve manufacturing process. Gas Bubbles These are small cavities that cause by residual gas during the metal solidification process. Their...
Welded steel pipes are also known as welded pipes, which can be divided into longitudinal welded pipe and spiral welded pipes according to the type of weld joint; or furnace butt weld pipes, electric...
The application scope of steel pipes is quite extensive with the development of this industry that they have branched out into not only gas or liquid transportation, but also associated products manufacturing...
China has made progress in reducing steel production capacity, which has led to increased efficiency and mismatch between supply and demand. In the first seven months of 2018, China cut 2.47 billion tons...
On June 26, Derbo Steel arranged the inspection for Galvanized Seamless Pipes and Fittings for our Indian Client. This is the first cooperation between Derbo Steel and this Indian company. We supplied...
API 5L GR.B PSL1 Seamless Steel Pipe for a Hydropower Plant in Nepal Products: API 5L GR.B PSL1 Seamless Pipe Size: 6 inch Sch 40 Quantity: 225 tons We sent carbon seamless pipes to Nepal for a...
Cast iron pipes are used for water supply, drainage and gas pipelines. They include straight cast iron pipes and fittings. According to different casting methods, a cast iron pipe is divided into a continuous...
In February 2018, DERBO STEEL delivered 14 pcs of Cu-Ni 90/10 Orifice WNO RF Flange to Dalian for PETROBRAS P-75-P-77. All the Flanges reach the ASME B16.36 standard and they are inspected by BV....
Recently, we have an order from a Singapore client about carbon steel pipes, flanges and fittings for one of their projects. They arranged the third party inspection company to our factory and inspected...
Stainless steel concentric reducers and weld neck flanges manufactured by Derbo have been delivered to one of our Taiwan customers. The customer is very satisfied with our good product quality and...
What is the crevice corrosion of stainless steel pipes? There may be metallic or non-metallic deposit sediment on the surfaces of stainless steel pipes, and the deposit sediment will form the crevice...
Sulfur(S): Sulfur is also a harmful element under the normal circumstance. It will create the hot brittleness of stainless steel pipes, decrease the impact ductility of stainless steel pipes and bring...
1. Carbon(C): When the carbon content in the stainless steel pipes is increased, yield and tensile strength of stainless steel pipes will be increased, but the plasticity and impact strength will...