Product Description
Pneumatic diaphragm valve is a special form of shut-off valve, which appeared in the 1920s. Its opening and closing part is a diaphragm made of soft material, which separates the inner cavity of the valve body from the inner cavity of the valve cover and the driving parts, so it is called a pneumatic diaphragm valve. The most prominent feature of the pneumatic diaphragm valve is that the diaphragm separates the inner cavity of the lower valve body from the inner cavity of the upper valve cover, so that the valve stem, valve clack and other parts located above the diaphragm are not corroded by the medium, and the packing seal structure is omitted, and it will not produce The medium leaks.
Features of diaphragm valve:
The diaphragm separates the inner cavity of the lower valve body from the inner cavity of the upper valve cover, so that the valve stem, valve disc and other parts located above the diaphragm are not corroded by the medium, and the packing seal structure is omitted, and no medium leakage occurs.
1. Diaphragm made of soft seal such as rubber or plastic has good sealing performance. Since the diaphragm is a vulnerable part, it should be replaced regularly according to the characteristics of the medium.
2. Limited by the diaphragm material, the diaphragm valve is suitable for low pressure and relatively low temperature occasions.
3. According to the structure of the diaphragm valve, it can be divided into six types: house type, direct current type, cut-off type, straight type, gate type and right angle type; the connection form is usually flange connection; according to the driving mode, it can be divided into manual, electric and pneumatic There are three types, of which pneumatic drive is divided into three types: normally open, normally closed and reciprocating.
4. Generally, it is not suitable to be used in pipelines where the temperature is higher than 60 degrees and conveying organic solvents and strong oxidizing media, and it is not suitable to use pneumatic diaphragm valves in higher pressure pipelines.
| DN |
L |
D |
D1 |
n- φd |
B |
H1 |
| 15 |
125 |
95 |
65 |
4-14 |
14 |
125 |
| 20 |
135 |
105 |
75 |
4-14 |
16 |
130 |
| 25 |
145 |
115 |
85 |
4-14 |
16 |
145 |
| 32 |
160 |
135 |
100 |
4-18 |
16 |
180 |
| 40 |
180 |
145 |
110 |
4-18 |
16 |
220 |
| 50 |
210 |
160 |
125 |
4-18 |
18 |
250 |
| 65 |
250 |
180 |
145 |
4-18 |
22 |
280 |
| 80 |
300 |
195 |
160 |
4-18 |
25 |
340 |
| 100 |
350 |
215 |
180 |
8-18 |
25 |
370 |
| 125 |
400 |
245 |
210 |
8-18 |
30 |
420 |
| 150 |
460 |
280 |
240 |
8-23 |
30 |
480 |
| 200 |
570 |
335 |
295 |
8-23 |
35 |
625 |
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