Valve of fluid bag

Abstract

There is disclosed a fluid bag valve which includes a main fluid pipe, several fluid bags and a valve casing. Fluid inlet and outlet controlling valves are disposed on both ends of the main fluid pipe separately. The several fluid bags are disposed in the valve casing. Each fluid bag is connected with the main fluid pipe by a fluid branch pipe and there are spaces between fluid bags. When the fluid bags are filled with pressure fluid, each pair of fluid bags tightly contact, so the valve presents the closed state. When the fluid in the bag is discharged, the fluid bags are separated each other, so the valve presents the open state.

Description

technical field [0001] The present invention relates to valves, and more particularly to a fluid bladder valve. technical background [0002] There are many types of valves used to control the flow of liquid or gas, including gate valves, globe valves, safety valves, ball valves, butterfly valves, flapper doors, etc. They are widely used in urban construction, environmental protection, petrochemical, electric power, metallurgy, etc. in the industry. Large-diameter valves are in short supply in China. At the same time, there are many shortcomings in the manufacture and application of large-diameter valves, such as high manufacturing and processing requirements, complex valve structure, expensive price, poor sealing, and difficulty in opening and closing (high driving requirements). Taking gate valves and butterfly valves as examples, the disadvantage of gate valves is that the operating torque is large, and the valve body and stem are easily damaged during operation. Especia...

AI Technical Summary

Problems solved by technology

Large-diameter valves are in short supply in China. At the same time, there are many shortcomings in the manufacture and application of large-diameter valves, such as high manufacturing and processing requirements, complex valve structure, expensive price, poor sealing, difficult opening and closing (high driving requirements), etc.

Taking gate valves and butterfly valves as examples, the disadvantage of gate valves is that the operating torque is large, and the valve body and stem are easily damaged during operation. Especially for large-diameter gate valves, their overall size and weight are also large. DN1000mm caliber gate valves are about 3200mm high, and need to have Four people operate at the same time, so gate valves are generally used below DN500

At present, the butterfly valve has gradually replaced the gate valve when the DN300mm or more is generally used in the world. Please refer to figure 1 , the butterfly valve mainly includes a valve body 21, a valve blade 22, a sealing ring 23, a rotating shaft (rotating pair) 24 and a driving mechanism 25. Although compared with the aforementioned gate valve, the large-diameter butterfly valve has greater advantages, but whether it is a gate valve or a butterfly valve , its structure basically still belongs to the category of traditional mechanical structure, which has the disadvantages of high manufacturing and processing requirements, complex valve structure, expensive price, large volume and weight

In practical industrial applications, it is difficult to find a large-diameter valve with simple and reliable structure, small size, high quality and low price.

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