Pneumatic flapper valve

Pneumatic flapper valve

The working principle of the pneumatic plug-in valve: the pneumatic plug-in valve is mainly composed of frame, gate, screw rod, nut and other parts. Turn the hand wheel by hand to make the screw rod carry the screw nut and the gate plate to reciprocate in the horizontal direction. The purpose of opening and closing the gate.

technical standard

1. The shell test and sealing test medium of the plug-in valve is water (including preservatives), kerosene or other suitable liquids with a viscosity not greater than water.

2. The sealing pair is a non-metallic sealed plug-in valve, and the sealing shell test and requirements are in accordance with GB/T13927-92 Class D regulations.

3. The sealing pair is a metal-sealed plug-in valve. For those with sealing performance requirements, the leakage rate of the sealing test is calculated as 1×DNmm/s. If there is no requirement for sealing performance, this test will not be done.

4. The plug-in valve driven by electric, hydraulic and pneumatic devices, after the closing position is adjusted, close 3 times according to the requirements of 1 and 3 to carry out the shell and sealing test.

5. The cleanliness requirements of the flapper valve are in accordance with the regulations of JB/T7748.

6. Static pressure life test.

7. The number of static pressure life tests of the flapper valve shall be in accordance with the regulations, and other technologies shall be in accordance with the regulations of JB/Z 234

Features

Pneumatic flapper valve is a kind of main control equipment for the flow or delivery of powder, grain, granular and small materials. It is widely used in metallurgy, mining, building materials, food, chemical and other industries to control flow changes or quickly cut off. The advantages of the pneumatic flapper valve are simple structure, flexible operation, light weight, no jamming, especially suitable for conveying and flow adjustment of various solid materials and block and mass materials of about 50mm. The installation is not limited by the angle, and the operation is convenient. The scale can be adjusted at any time. Structural features: Simple structure, flexible operation, light weight, no jamming, fast cutting, especially suitable for all kinds of non-viscosity solids, powders and granular materials less than Φ10mm. The conveying and flow adjustment of granular materials are not restricted by the angle of installation. , Easy to operate, and the opening can be adjusted at any time. It is mainly used for the roof, bottom, import and export of building materials, metallurgy, mining, electric power, chemical industry, glass, light industry, grain and other industries. It is an ideal equipment for controlling large changes in flow rate, frequent start-ups, and rapid cut-offs.

Pneumatic single and two-way flapper valve is also called manual knife gate valve. Knife gate valve is a valve whose gate and valve seat are always in close contact and sealing. The opening and closing of the plate makes the round opening on the gate completely separate and coincide with the diameter. The advantage of this valve is that the valve body has no grooves, the medium will not be blocked and blocked, and it has the characteristics of full-diameter flow. Its sealing structure can be divided into soft sealing and hard sealing structures. The penetrating knife gate valve has the characteristics of precise structure, good manufacturability, compact structure, etc. The sealing valve seat is designed with a movable structure, which has the functions of anti-wear and automatic compensation, so it has a longer life. In the process of closing and opening, the valve seat and the gate keep moving closely, which makes the opening and closing force of the valve stable and has the characteristics of cutting off the medium.