Structure and standards of sanitary diaphragm valves

Structure and standards of sanitary diaphragm valves
1. The weir type diaphragm valve has a short stroke and high flow resistance (compared to the straight through type), and has lower requirements for diaphragm flexibility. Weir type diaphragm valves have structures such as plastic lined, rubber lined, enamel lined, and unlined, and are the most widely used form of diaphragm valves. They have certain throttling characteristics and can be used in vacuum. Good corrosion resistance and particle medium resistance. Reliable sealing and low cost. The valve body has integral casting and forging welding structures, and the forging welding structure of the valve body material has a high density, which can be used in high vacuum industrial and mining
Connection end form: flange, thread, butt welding, socket welding, etc
The 2-way sanitary diaphragm valve has small flow resistance, longer stroke (compared to the weir type), higher requirements for diaphragm flexibility, good cutting performance and flow capacity, and can be used for high vacuum. Corrosion resistant, can be used in granular media, and the inner cavity can be lined with plastic, rubber, or enamel
Connection end form: flange, thread, butt welding, socket welding, etc
The 3 DC diaphragm valve has the characteristics of a globe valve and a diaphragm valve. The valve seat is sealed with a metal valve disc coated with non-metallic materials, which has high load-bearing capacity and sealing performance. The diaphragm serves as a flange seal and valve stem packing seal, as well as a barrier to isolate the valve body and cover, ensuring reliable sealing. The flow of the valve body is linear, with good flow capacity, low flow resistance, and no dead corners of accumulated media. The inner cavity of the valve body can be lined with rubber or plastic. Usually flanged or butt welded
The 4-needle diaphragm valve has the characteristics of a needle globe valve and a diaphragm valve, with a small stroke and low requirements for diaphragm flexibility. The inner chamber of the valve body can be lined with plastic or rubber, usually threaded connection
The valve body of the 5 weir type ceramic diaphragm valve adopts a structure of ceramic integral forming or metal valve body lined with ceramic. The diaphragm is made of soft film like PTFE material to improve wear and corrosion resistance. The back of the diaphragm is lined with thick rubber to improve its load-bearing capacity, and the ceramic shaped parts must be able to withstand temperature changes of 80 ℃ without damage
Connection form: mainly wafer type and flange type
The general structure of a 6-weir plastic diaphragm valve is made of plastic or rubber, except for the valve stem and fasteners. Can be used in highly corrosive media
The main material of the 7 direct current and right angle glass diaphragm valves is glass. The structure usually comes in two forms: straight through and right angle. The valve body has transparency and can observe the movement and reaction of medium materials inside the valve. The connection form is usually piston flange
The 8 sleeve diaphragm valve has a compact structure, fast opening and closing, and can play a certain role in throttling and slowing down medium pressure fluctuations. The connection method is usually threaded connection