Sheet metal fabrication processing is formed by laser cutting or stamping process, shear and bending, bending, bending, welding, riveting. The Sheet metal fabrication used are cold-rolled plate (SPCC), hot-rolled plate, galvanized plate (SHCC) (SECC, SGCC), copper (CU) brass, copper, beryllium copper, aluminum (5052), stainless steel. Sheet metal fabrication processing steps: according to the parts drawing (3D) expanded into a plan (2D), laser cutting or die stamping shape, CNC punching each bending part, should pay attention to the direction of the burr of the workpiece. Then the students are welded or riveted (some). Surface treatment after processing: electroplating, passivation, sand blasting (powder), anode treatment. Products are generally made for the connection and the outer cover. Applications in robotics, drone, communications, medical devices, industrial automation equipment. Sheet Metal Fabrication,Oem Sheet Metal Fabrication,Sheet Metal Forming,Sheet Metal Bending Hong Kong RYH CO., LTD , https://www.longfeikitchenware.com
A butterfly valve is a valve in which a closing member (valve or butterfly plate) is a disk that rotates around a valve shaft to open and close, and is mainly used for cutting and throttling in a pipeline. Butterfly valve opening and closing device is a disc-shaped butterfly plate, rotating around its own axis in the valve body, so as to achieve the purpose of opening and closing or adjusting. The full opening of the butterfly valve is usually less than 90°. The butterfly valve and the butterfly rod have no self-locking ability. To position the butterfly plate, a worm gear reducer is installed on the valve stem. The use of a worm gear reducer not only allows the butterfly plate to have self-locking capability, allows the butterfly plate to stop at any position, but also improves the valve's operating performance.
Industrial special butterfly valve features high temperature resistance, applicable pressure range is also high, the valve nominal diameter large, the valve body is made of carbon steel, the valve plate seal ring with a metal ring instead of a rubber ring. The large-scale high-temperature butterfly valve is made of steel plate welding and is mainly used for high temperature medium smoke ducts and gas pipelines.
The advantages of the butterfly valve are as follows:
1. It is convenient and quick to open and close, saves labor, and has low fluid resistance. It can be operated frequently.
2, simple structure, small size, light weight.
3, can be transported mud, the liquid at the mouth of the pipeline at least.
4. Under low pressure, good sealing can be achieved.
5, adjust the performance is good.
The disadvantages of butterfly valves are as follows:
1, the use of pressure and operating temperature range is small.
2, poor sealing.
The butterfly valve can be divided into offset plate type, vertical plate type, inclined plate type and lever type according to the structural form. According to the sealed form, it can be divided into two types, a relatively sealed type and a hard sealed type. Soft seals are generally rubber ring seals, and hard seals are usually metal ring seals.
According to the connection type can be divided into flange connection and wafer type connection; according to the transmission mode can be divided into manual, gear transmission, pneumatic, hydraulic and electric several.
Butterfly valve installation and maintenance should pay attention to the following matters:
1. During installation, the valve flap should be stopped in the closed position.
2. The opening position should be determined according to the rotation angle of the butterfly plate.
3, with a bypass valve butterfly valve, open the bypass valve before opening.
4, should be installed according to the manufacturer's installation instructions, the weight of the butterfly valve, should set a solid foundation.