A, manual diaphragm valve is related to the clamping Industrial Valves, diaphragm valve using synthetic rubber diaphragm in the valve body instead of bushing to separate flow logistics and valves and components. When the compression, the diaphragm valve is toward the bottom of the valve body in order to provide bubble tight closure. Similar to clamp valve diaphragm valve advantages. Said its closure components are not technology medium moisture, therefore in corrosive process medium can use cheaper materials. Flow through or approximate to a straight line through the logistics is linear, and small pressure drop, making it an ideal switch operation, and avoid the turbulent flow. Diaphragm valve for throttling operation, but near the bottom of the valve body to maintain a throttle position, sometimes small particles in the diaphragm or cut at the bottom of the Industrial Valves body into bandits and cause corrosion. Because the diaphragm is located in the pressure on the valve body, the diaphragm valve could deal with slightly higher pressure than tightening valve, but the total rated pressure and temperature range is dependent on the toughness of the material or enhancement of the diaphragm. The body flow channel ( Add a weir, for instance) Related to the amount of diaphragm toughness. Another advantage is the weak diaphragm valve diaphragm failure, can hold out the logistics of the valve body, and good at tightening valve housing. Diaphragm valve application conditions similar to clamp valve. Springback make him along the fluid particles by the diaphragm seal, and make it in the material pulp, process material or containing solid fluid that can be the ideal operation. Compared with the clamp valve, diaphragm valve body are the main disadvantages of the cost of higher than clamp valve housing. Because the body material is a must and matching process logistics. At the same time when the diaphragm has a tendency to organize the springback process medium, diaphragm valve body is corrosion makes switch more difficult. According to the design, the diaphragm valve than clamp valve used in a larger size, can generally be big to 14 in ( DN350) , but some special design can be as high as 20 (in DN500) 。 As a result of the liner pressure limit, the diaphragm valve pressure almost always rated at level ANSI150 ( PN16） 。 Second, manual diaphragm valve design two kinds of typical structure diaphragm valve is a straight line through the structure and the structure of weir. Weir diaphragm valve and the structure of the straight through type diaphragm valve, remove the body and the diaphragm, similar to other parts of the structure. A coating on the body of the lips, it up and meet with the diaphragm, because Russia can issue that small diaphragm. The body is the drainage type, so it is ideal for food good operation. Because the diaphragm can be made from strong material, so the body can also be used for high pressure conditions. The elasticity of the diaphragm is not enough to use a long trip. Strong and strengthen the diaphragm also makes the weir structure used for high pressure conditions, the diaphragm elastic enough to for a long trip, stronger and enhance the diaphragm weir structure used in vacuum operation. A straight line, on the other hand, through the diaphragm valve, the bottom of the body wall almost parallel to the logistics, make logistics unhindered through the valve without interference. The diaphragm elastic to make it can move to the bottom of the valve body. Diaphragm compressor is above, its shape is quite like a circular parts body flow channel, and it is connected to the handwheel stem. Diaphragm installed in a compressed the bottom in order to make sure the diaphragm in the fully open position can be filed away from logistics. Compressor is not valve parts in contact with the medium, the handwheel is located and the body bonnet bolting. The diaphragm itself is used as a gasket between the valve body and valve blocks, used to prevent the leak into the atmosphere. Third, manual diaphragm valve operation manual diaphragm valve operation is very similar to hose valve operation. Rotate the handwheel is a decline in compressors, began to like the bottom of the valve body to push the diaphragm wall. In throttling state, after manual manipulator rotate to the required flow and stay there. In the open - Closed state, the maximum pressure, two surfaces were tight seal. When the diaphragm Industrial Valves opens, the rotation of the manual operator role, on the other hand, when closing element to expand the flow area after ascension. Finally, in the full open position, compressor completely shrink into the valve blocks, the diaphragm from logistics. At this point the valve area reached its full capacity. Anyhow diaphragm valve provides inherent flow characteristics such as percentage, this feature tends to linear motion during operation.
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