Overview of pneumatic O-type cut-off ball valve
Pneumatic O-type cut-off ball valve pneumatic actuator adopts new AT / GT series pneumatic actuator. Its structure has obtained national utility model patent. It has double-acting and single-acting (spring return). It adopts rack-and-pinion structure transmission for safer and more reliable performance. .
I. Introduction of Pneumatic O-cut Ball Valve
Pneumatic O-type cut-off ball valve pneumatic actuator adopts new AT / GT series pneumatic actuator. Its structure has obtained national utility model patent. It has double-acting and single-acting (spring return). It adopts rack-and-pinion structure transmission for safer and more reliable performance. ; Large-caliber valves use AW series pneumatic actuators, shifting fork-type structure transmission, reasonable structure and large output torque.
Pneumatic O-type cut-off ball valve has a one-second cut-off ball valve. It is equipped with explosion-proof device and can be cut off by gas. It is composed of ball valve and single-acting piston type pneumatic actuator. It is widely used in natural gas, oil products, chemical industry, metallurgy, paper and electricity office, mining, printing and dyeing, biopharmaceuticals, daily chemical industry, food and beverage, water treatment and air treatment industries. Fluid cut-off control, used with automatic pneumatic instruments.
Second, the working principle of pneumatic o-cut ball valve
Pneumatic O-type cut-off ball valve is composed of valve body, ball body, valve shaft, seal ring, packing, pressure plate and other parts. The actuator consists of gas, piston, gear type, output shaft, cylinder head, bearing, guide ring, piston bearing pad, adjusting bolt, "O" ring and other main components. The actuator is connected to the valve with a connecting shaft. After the air pressure is input in the cylinder, a certain thrust force is generated on the piston, so that the gear-type output is pushed by the piston, the gear output shaft is rotated, and the valve shaft is rotated, so that the ball valve ball rotates in the valve and changes the valve's The flow area can achieve the purpose of changing the flow rate of the medium through the valve.
1. The thrust bearing reduces the friction moment of the valve stem, which can make the valve stem operate smoothly and flexibly for a long time.
2. The valve seat has good sealing performance, and the sealing ring is made of elastic materials such as polytetrafluoroethylene.
3. Anti-static function: A spring is set between the ball, valve stem and valve body, which can discharge the static electricity generated during the switching process.
4. Stem seal is reliable. Because the stem only rotates and does not perform lifting movement, the packing seal of the stem is not easy to break.
5. Because the materials such as polytetrafluoroethylene have good self-lubricity, and the friction loss with the ball is small, the service life of the ball valve is long.
6, fast cut-off speed, with a one-second cut-off capability, and good sealing performance, can be equipped with explosion-proof devices, can be cut off with gas pipelines.
Material of parts for pneumatic O-type cut-off ball valve
|Serial number||Part Name||Serial number||Part Name||Serial number||Part Name||Serial number||Part Name||Serial number||Part Name|
|1||Valve body||4||Nut||7||Gasket||10||Positioning pieces||13||Valve stem|
|2||Sealing ring||5||Stud||8||filler||11||Retaining ring||14||Screw|
|3||Sphere||6||Stone body||9||Packing gland||12||handle||15||Thrust washer|
Performance parameters of pneumatic O-type cut-off ball valve
|Test pressure (Mpa)||Nominal pressure (Mpa)||Pressure class||JIS (Mpa)|
|Airtight test||0.5 ～ 0.7|
Technical parameters of pneumatic O-cut ball valve
|Nominal diameter mm||DN15-DN300|
|main part||Valve body||WCB||ZG1Cr18Ni9Ti|| ZG1Cr18Ni |
|Sealing ring||Reinforced polytetrafluoroethylene|
|Filling||Teflon flexible graphite|
|Applicable conditions||Applicable medium||Steam, water||Nitric acid||Acetic acid|
|proper temperature||-28 ℃-300 ℃|
|Actuator||Type||AW, DA / SR series, GTE series, TH series, etc.|
Seven, installation size table
| Nominal diameter |
|Size (mm)||Actuator type|
|L||D||D1||b||Z-фD||L||D||D1||b||Z-фD||L||D||D1||b||Z-фD|| Optional DA / SR, QGSY, |
SY-CH, GTD / GTE
AW / AWS, SY-YD,
The above series of actuators are only for reference for specific selection.
|65||222||180||145||18||4-18||222||180||145||twenty two||8-18||290||290||145||twenty two||8-18|
|80||241||195||160||20||8-18||241||195||160||twenty two||8-18||310||310||160||twenty two||8-18|
|100||305||215||180||20||8-18||305||230||190||twenty four||8-23||350||350||190||twenty four||8-23|